Gearbox shell side wall ventilation structure

Abstract

The utility model discloses a gearbox shell side wall ventilation structure, which belongs to the technical field of gearboxes, and comprises a mounting hole, an exhaust passage and a pressure relief unit, and the mounting hole is arranged on the outer side wall of a gearbox shell; the exhaust channel is formed in the inner side wall of the gearbox shell and communicates with the mounting hole. And the pressure relief unit is hermetically mounted on the mounting hole. Through the design of the mounting hole, the pressure relief unit and the exhaust channel, when the oil gas pressure in the gearbox shell reaches a certain value, the air channel can be elastically blocked by the air blocking mechanism, so that part of oil gas penetrates through the air channel and is exhausted from the exhaust pipe, the air pressure in the gearbox shell is reduced, and the internal air pressure and the external air pressure are balanced; the exhaust pipe is thin and long, and the opening of the exhaust pipe faces downwards, so that outside water is not prone to entering the exhaust pipe, and the possibility that rainwater or sludge in water enters the exhaust pipe during wading to cause blockage of the exhaust pipe is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to gearbox technical field, concretely relates to a gearbox casing lateral wall ventilation structure. BACKGROUND

[0002] When the gearbox works, the gear, bearing and other components generate heat by friction, the lubricating oil temperature rises, the internal oil gas volume expands, and the pressure sharply rises. If the pressure cannot be released, it may exceed the bearing limit of the sealing element (such as oil seal, casing joint), causing lubricating oil leakage, so it is necessary to design a ventilation pressure relief structure to relieve pressure in time. SUMMARY

[0003] In view of the above technical deficiencies, the utility model aims at providing a gearbox casing lateral wall ventilation structure which automatically relieves pressure when the air pressure in the gearbox casing rises to a certain value.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme: the utility model provides a gearbox casing lateral wall ventilation structure, which comprises:

[0005] The mounting hole is arranged on the outer side wall of the gearbox casing;

[0006] The exhaust passage is arranged on the inner side wall of the gearbox casing and communicates with the mounting hole;

[0007] The pressure relief unit is sealingly mounted on the mounting hole, and the pressure relief unit comprises a gas blocking mechanism and an exhaust pipe, the gas blocking mechanism elastically blocks the air passage between the mounting hole and the exhaust pipe, and the exhaust pipe is in an elongated shape and has an opening downward.

[0008] Preferably, the pressure relief unit comprises a cylinder, one end of the cylinder is threadedly connected with the mounting hole, the other end of the cylinder is provided with an end cover, and the exhaust pipe is arranged on the lower side wall of one end of the cylinder close to the end cover.

[0009] Preferably, the gas blocking mechanism comprises:

[0010] The partition plate is fixed in the cylinder, and a through hole is arranged on the partition plate;

[0011] The plug is movably mounted in the cylinder between the end cover and the partition plate;

[0012] The spring is arranged in the cylinder between the plug and the end cover;

[0013] Wherein, the plug is inserted in the through hole under the action of the spring.

[0014] Preferably, the through hole is a tapered hole, and the plug is a tapered plug.

[0015] Preferably, a guide rod is fixed on the end face of the end cover close to the plug, a blind hole is formed in the end of the plug towards the end cover, and the guide rod is movably inserted into the blind hole.

[0016] Preferably, a sealing ring is arranged inside the through hole, a convex ring is fixed on the outer wall of the barrel, and a sealing pad is arranged between the convex ring and the outer wall of the gearbox housing.

[0017] Preferably, the exhaust passage comprises a main passage and a sub-passage, the main passage comprises an inclined section and a vertical section, the vertical section is communicated with the mounting hole, the inclined section is located below the vertical section, and the sub-passage is communicated with the vertical section.

[0018] Preferably, a flared groove is formed in one end of the inclined section close to the inner wall of the gearbox housing.

[0019] Preferably, a drooping part is arranged on the upper edge of the flared groove.

[0020] Preferably, the exhaust passage is arranged obliquely, and the height of one end of the exhaust passage close to the inner wall of the gearbox housing is lower than the height of the other end close to the mounting hole.

[0021] The beneficial effects of the utility model lie in:

[0022] The utility model discloses a mounting hole, a pressure relief unit and an exhaust passage are designed, when the oil gas pressure in the gearbox housing reaches a certain value, the elastic plugging of the gas passage by the gas blocking mechanism can be broken, part of the oil gas passes through the gas passage and is discharged from the exhaust pipe, thereby reducing the gas pressure in the gearbox housing and balancing the internal and external gas pressures, the exhaust pipe is long and narrow and has an opening downward, so that external moisture is not easy to enter the exhaust pipe, thereby reducing the possibility of the entry of sludge in water into the exhaust pipe and causing the blockage of the exhaust pipe when raining or wading, and the exhaust passage is arranged obliquely, so that the lubricating oil in the gearbox is not easy to enter the exhaust passage and flow into the mounting hole, and the leakage of the lubricating oil through the pressure relief unit is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0024] Figure 1 The structure diagram of the gearbox housing side wall ventilation structure provided in the embodiments of the utility model is shown.

[0025] Figure 2 The structure diagram of the gearbox housing side wall ventilation structure provided in the embodiments of the utility model is shown. Figure 1 The local enlarged view of A in the middle.

[0026] Figure 3 It is the front view perspective view of the pressure relief unit of the utility model.

[0027] Figure 4 It is the back view perspective view of the pressure relief unit of the utility model.

[0028] Figure 5 It is the cooperation schematic view of the end cover and the plug of the utility model.

[0029] Figure 6 It is the perspective view of the cylinder of the utility model.

[0030] Mark explanation:

[0031] 1, gearbox housing, 2, mounting hole, 3, exhaust passage, 4, pressure relief unit, 5, exhaust pipe, 6, airway, 7, cylinder, 8, end cover, 9, baffle, 10, through hole, 11, plug, 12, spring, 13, guide rod, 14, sealing ring, 15, convex ring, 16, gasket, 17, inclined section, 18, vertical section, 19, sub passage, 20, flared groove, 21, droop. Specific implementation

[0032] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0033] Embodiment one:

[0034] As shown in the drawings, Figures 1 to 6 The gearbox housing 1 side wall ventilation structure provided by the utility model embodiment one includes the mounting hole 2 opened on the outer side wall of the gearbox housing 1 and the exhaust passage 3 opened on the inner side wall of the gearbox housing 1. As shown in the drawings, Figure 1 The exhaust passage 3 is arranged obliquely, one end thereof communicates with the mounting hole 2, and the other end thereof communicates with the inner cavity of the gearbox housing 1. The end of the exhaust passage 3 close to the inner wall of the gearbox housing 1 is lower than the end close to the mounting hole 2, forming a certain inclination angle. The inclined exhaust passage 3 makes the lubricating oil splashed by the high-speed rotation of the gear in the inner wall of the gearbox housing 1 not easy to enter the mounting hole 2 along the exhaust passage 3, and can effectively guide the lubricating oil to flow back to the gearbox housing 1. The pressure relief unit 4 is installed on the mounting hole 2, which is used for pressure relief when the air pressure in the gearbox housing 1 reaches a certain value, to avoid the air pressure in the gearbox housing 1 being too high.

[0035] As shown in the drawings, Figure 2 And Figure 3As shown, the pressure relief unit 4 comprises a cylinder 7 and an end cover 8 threadedly mounted on one end of the cylinder 7, and the open end of the cylinder 7 is threadedly mounted on the mounting hole 2. The inner cavity of the cylinder 7 between the mounting hole 2 and the end cover 8 forms the air passage 6. An elongated exhaust pipe 5 is connected to the lower side of the end of the cylinder 7 close to the end cover 8 and communicates with the air passage 6, and the open end of the exhaust pipe 5 extends downward. Since the air passage 6 is communicated with the outside through the exhaust pipe 5, when there is water outside, the air in the air passage 6 will hinder the liquid water from entering the exhaust pipe 5, thereby avoiding the intrusion of the liquid water outside.

[0036] A gas blocking mechanism is arranged in the cylinder 7 for unidirectional limiting of gas flow. The gas blocking mechanism mainly comprises a plug 11 and a partition plate 9 fixed in the air passage 6, the center of the partition plate 9 is provided with a through hole 10, and the plug 11 is provided with a spring 12 between the plug 11 and the end cover 8. The plug 11 is pressed against the through hole 10 under the action of the spring 12, so that the air in the transmission case 1 is isolated from the outside air. When the air pressure in the transmission case 1 exceeds a set value, the oil gas pushes the plug 11 to compress the spring 12, at this time, the plug 11 and the through hole 10 have a gap, and the oil gas is discharged to the outside through the gap and the exhaust pipe 5, thereby reducing the air pressure in the transmission case 1 and maintaining the balance of the internal and external pressures.

[0037] Embodiment two:

[0038] On the basis of embodiment one, the plug 11 and the through hole 10 are optimized by fixing a guide rod 13 on the inner wall of the end cover 8 and machining a blind hole on the side of the plug 11 close to the end cover 8, and the blind hole and the guide rod 13 form a clearance fit, which enables the plug 11 to move on the guide rod 13. The spring 12 is sleeved on the guide rod 13 between the plug 11 and the end cover 8. The guide rod 13 limits the moving direction of the plug 11 to ensure the axial movement of the plug 11, and the spring 12 provides stable sealing pressure to improve the sealing reliability of the pressure relief unit 4.

[0039] The through hole 10 is designed as a tapered hole, and the plug 11 is designed as a tapered plug, so that when the plug 11 is inserted into the through hole 10 under the action of the spring 12, the plug 11 and the through hole 10 can be self-centered and aligned by means of the taper, and the plug 11 and the through hole 10 can be in close contact.

[0040] Meanwhile, a sealing ring 14 is embedded in the through hole 10, and when the plug 11 is inserted into the through hole 10, the tapered surface of the plug 11 abuts against the sealing ring 14, thereby improving the sealing effect.

[0041] Embodiment three:

[0042] On the basis of embodiment one and embodiment two, the utility model further optimizes the structure of exhaust passage 3. As shown in Figure 2 Exhaust passage 3 contains main passage and auxiliary passage 19, wherein main passage is composed of two sections of inclined section 17 and vertical section 18. The top of vertical section 18 is communicated with mounting hole 2, and the bottom is communicated with inclined section 17, and the end of inclined section 17 away from vertical section 18 is provided with flared groove 20. The width of flared groove 20 is larger than the diameter of main passage, and the upper edge of flared groove 20 is provided with downward bending droop 21. Auxiliary passage 19 is also inclined and communicated with vertical section 18 at one end and the inner cavity of gearbox housing 1 at the other end.

[0043] When the lubricating oil splashes into flared groove 20, it is not easy to enter due to the narrow diameter of inclined section 17. Since auxiliary passage 19 can also enter the flowing oil gas, a small amount of lubricating oil entering inclined section 17 will not continue to move upward under the pressure of oil gas, but will flow back into flared groove 20 and finally flow back into gearbox housing 1. Droop 21 can prevent the oil droplets falling from above from entering flared groove 20, and can guide the oil droplets to flow back into the housing.

[0044] By designing main passage and auxiliary passage 19, auxiliary passage 19 serves as an auxiliary exhaust path, maintains the air passage ability when the main passage is blocked by lubricating oil, makes it easy for lubricating oil to flow back into the housing from the main passage, significantly reduces the possibility of lubricating oil entering mounting hole 2, and at the same time provides a redundant exhaust function.

[0045] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and its equivalent technologies, the utility model also intends to include these modifications and variations.

Claims

1. A ventilation structure for the side wall of a gearbox housing, characterized in that, include: Mounting holes are provided on the outer wall of the gearbox housing; An exhaust passage is provided, which is located on the inner wall of the gearbox housing and communicates with the mounting hole. A pressure relief unit is sealed and installed on a mounting hole. The pressure relief unit includes an air-blocking mechanism and an exhaust pipe. The air-blocking mechanism elastically seals the air passage between the mounting hole and the exhaust pipe. The exhaust pipe is long and thin with its opening facing downwards.

2. The gearbox housing sidewall ventilation structure as described in claim 1, characterized in that, The pressure relief unit includes a cylinder, one end of which is threaded into a mounting hole, and the other end of which is provided with an end cap. The exhaust pipe is located on the lower side wall of the cylinder near the end cap.

3. The gearbox housing sidewall ventilation structure as described in claim 2, characterized in that, The air-blocking mechanism includes: A partition plate is fixed inside the cylinder, and a through hole is provided on the partition plate; A stopper, which is movably installed inside the cylinder between the end cap and the partition; A spring disposed within a cylinder between the plug and the end cap; The plug is inserted into the through hole under the action of a spring.

4. The gearbox housing sidewall ventilation structure as described in claim 3, characterized in that, The through hole is a tapered hole, and the plug is a tapered plug.

5. The gearbox housing sidewall ventilation structure as described in claim 3, characterized in that, A guide rod is fixed to the end face of the end cap near the plug, and a blind hole is opened at the end of the plug facing the end cap, and the guide rod is movably inserted into the blind hole.

6. The gearbox housing sidewall ventilation structure as described in claim 3, characterized in that, A sealing ring is provided inside the through hole, a convex ring is fixed on the outer wall of the cylinder, and a sealing gasket is provided between the convex ring and the outer wall of the gearbox housing.

7. The gearbox housing sidewall ventilation structure as described in claim 1, characterized in that, The exhaust passage includes a main passage and a secondary passage. The main passage includes an inclined section and a vertical section. The vertical section is connected to the mounting hole. The inclined section is located below the vertical section. The secondary passage is connected to the vertical section.

8. A venting structure for the side wall of a gearbox housing as described in claim 7, characterized in that, The inclined section has a flared groove at one end near the inner wall of the gearbox housing.

9. A venting structure for the side wall of a gearbox housing as described in claim 8, characterized in that, The upper edge of the flared groove is provided with a drooping part.

10. A venting structure for the side wall of a gearbox housing as described in claim 1, characterized in that, The exhaust passage is inclined, and the height of the end of the exhaust passage near the inner wall of the gearbox housing is lower than the height of the end near the mounting hole.

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