Ventilation plug for speed reducer

Abstract

The utility model discloses a ventilation plug for a speed reducer, which relates to the technical field of ventilation plugs and comprises a ventilation plug shell, a first ventilation channel is arranged inside the ventilation plug shell, a second ventilation channel is arranged inside the ventilation plug shell, the second ventilation channel is concave, the first ventilation channel is communicated with the second ventilation channel, and the first ventilation channel is communicated with the second ventilation channel. An elastic blocking device is arranged in the second air duct and comprises a blocking ball. The ventilation plug shell is in threaded connection with the ventilation plug cover, the top face of the ventilation plug cover is provided with the ventilation opening, the bottom end of the ventilation plug cover is fixedly connected with the spring, and the bottom end of the spring is fixedly connected with the plug ball, so that when the internal pressure of the speed reducer in work is too high, the plug ball can be ejected to move upwards, and at the moment, the ventilation plug is opened; when the speed reducer does not work and the internal pressure is small, the spring can abut against the plug ball to block the second exhaust hole, the ventilation plug is sealed, and impurities are prevented from invading the interior of the speed reducer.

Description

Technical Field

[0001] The utility model relates to the technical field of vent plugs, in particular to a vent plug for a speed reducer. Background Technique

[0002] Most construction machinery is equipped with various gear speed reducers due to the need for transmission. During operation, the oil temperature in the gear speed reducer rises, and the internal gas will undergo significant property changes, forming an internal and external air pressure difference. Once the pressure inside the gear speed reducer housing reaches a certain value, high-pressure gas will be discharged, which easily damages the seal and causes oil leakage from the housing. Usually, a vent plug is installed at the top of the speed reducer housing. The vent passage of a common vent plug is often always in communication with the outside world. Oil foam is easily carried out by the discharged high-pressure gas and sprayed outside the speed reducer. When it is not working, harmful substances such as dust will also invade the inside of the speed reducer through the vent passage, and oil leakage is also likely to occur during transportation. Content of the Utility Model

[0003] The purpose of the utility model is to provide a vent plug for a speed reducer to solve the problems proposed in the above background technique that the vent passage of the vent plug is often always in communication with the outside world, oil foam is easily carried out by the discharged high-pressure gas and sprayed outside the speed reducer, when it is not working, harmful substances such as dust will also invade the inside of the speed reducer through the vent passage, and oil leakage is also likely to occur during transportation.

[0004] To achieve the above purpose, the utility model provides the following technical scheme: A vent plug for a speed reducer, including a vent plug housing. An air passage one is arranged inside the vent plug housing. An air passage two is opened inside the vent plug housing. The air passage two is concave. The air passage one is communicated with the air passage two. An elastic plugging device is arranged inside the air passage two. The elastic plugging device includes a plug ball. The plug ball is stuck at the notch in the passage of the air passage two. The top end of the plug ball is fixedly connected with a spring. The outer wall of the top of the vent plug housing is threadedly connected with a vent plug cover. The top end of the spring is fixedly connected with the upper part of the inner wall of the vent plug cover. A vent hole is opened at the center of the vent plug cover. A nut is fixedly connected to the top surface of the vent plug cover. The vent hole is communicated with the inner cavity of the nut. A detachable sealing device is arranged at the top of the nut.

[0005] Preferably, the sealing device includes a fixing plate. The fixing plate is fixed in the inner cavity of the nut. A support column is fixedly connected to the top surface of the fixing plate. A rubber pull ring for sealing the opening of the nut is sleeved on the outer wall of the support column.

[0006] Preferably, the rubber pull ring includes a first pull ring for sealing the opening at the top end of the nut. The outer wall of the first pull ring is fixedly connected with a rubber connecting plate, and the end of the rubber connecting plate away from the first pull ring is detachably connected to the vent plug housing.

[0007] Preferably, a first annular groove is formed on the top surface of the vent plug housing. The end of the rubber connecting plate away from the first pull ring is fixedly connected with a second pull ring, and the second pull ring is sleeved in the first annular groove.

[0008] Preferably, a pressing plate for restricting the position of the first pull ring is fixedly connected to the top end of the support column.

[0009] Preferably, a second annular groove is formed inside the vent plug housing, and an oil mist filter element for filtering impurities is arranged inside the second annular groove.

[0010] Technical effects and advantages of the present utility model: By threadedly connecting a vent plug cover to the vent plug housing in the present utility model, a vent hole is formed on the top surface of the vent plug cover, and a spring is fixedly connected to the bottom end of the vent plug cover. The bottom end of the spring is fixedly connected with a plug ball. When the internal pressure of the speed reducer is too high during operation, it will push the plug ball upward. At this time, it is equivalent to opening the vent plug, and the gas can be discharged. When the internal pressure of the speed reducer is low during non-operation, the spring will abut against the plug ball to block the second exhaust hole, achieving the sealed state of the vent plug and preventing impurities from entering the inside of the speed reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a three-dimensional structural schematic diagram of the present utility model.

[0012] Figure 2 is a front view sectional structural schematic diagram of the vent plug of the present utility model.

[0013] Figure 3 is a structural schematic diagram of the nut of the present utility model.

[0014] Figure 4 is a structural schematic diagram of the rubber pull ring of the present utility model.

[0015] In the figure: 1, vent plug housing; 2, first ventilation channel; 3, second ventilation channel; 4, plug ball; 5, spring; 6, vent plug cover; 7, vent hole; 8, nut; 9, rubber pull ring; 91, rubber connecting plate; 92, first pull ring; 93, second pull ring; 10, fixing plate; 11, support column; 12, pressing plate; 13, first annular groove; 14, oil mist filter element; 15, second annular groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0017] The present utility model provides a breather plug for a speed reducer as shown in Figures 1-4 , which includes a breather plug housing 1. An air passage one 2 is provided inside the breather plug housing 1. An air passage two 3 is opened inside the breather plug housing 1. The air passage two 3 is concave. The air passage one 2 communicates with the air passage two 3. An elastic blocking device is provided inside the air passage two 3. The elastic blocking device includes a plug ball 4. The plug ball 4 is stuck at the notch in the channel of the air passage two 3. A spring 5 is fixedly connected to the top end of the plug ball 4. The outer wall of the top of the breather plug housing 1 is threadedly connected with a breather plug cover 6. The top end of the spring 5 is fixedly connected to the upper part of the inner wall of the breather plug cover 6. An air vent 7 is opened at the center of the breather plug cover 6. A nut 8 is fixedly connected to the top surface of the breather plug cover 6. The air vent 7 communicates with the inner cavity of the nut 8. A detachable sealing device is provided at the top of the nut 8;

[0018] By threadedly connecting a breather plug cover 6 to the top surface of the breather plug housing 1, an air vent 7 is provided on the top surface of the breather plug cover 6, and a spring 5 is fixedly connected inside the breather plug cover 6. The bottom end of the spring 5 is fixedly connected to a plug ball 4. Through the cooperation of the plug ball 4 and the spring 5, when the internal pressure of the speed reducer increases during use, it will push the plug ball 4 to move upward. At this time, a gap is generated between the plug ball 4 and the air passage two 3, so that the pressure is released, and finally it is dissipated through the inner cavity of the nut 8.

[0019] As shown in Figure 1 and Figure 2 , the sealing device includes a fixing plate 10. The fixing plate 10 is fixed in the inner cavity of the nut 8. A support column 11 is fixedly connected to the top surface of the fixing plate 10. A rubber pull ring 9 for sealing the opening of the nut 8 is sleeved on the outer wall of the support column 11.

[0020] As shown in Figure 2 , the rubber pull ring 9 includes a pull ring one 92 for sealing the opening at the top end of the nut 8. A rubber connecting plate 91 is fixedly connected to the outer wall of the pull ring one 92. One end of the rubber connecting plate 91 away from the pull ring one 92 is detachably connected to the breather plug housing 1. When the pull ring two 93 is sleeved on the support column 11, it can seal the top end of the nut 8 to prevent impurities from penetrating into the speed reducer.

[0021] As shown in Figure 2As shown in the figure, a first annular groove 13 is formed on the top surface of the vent plug housing 1. One end of the rubber connecting plate 91 away from the first pull ring 92 is fixedly connected to a second pull ring 93. The second pull ring 93 is sleeved at the first annular groove 13. When the second pull ring 93 is sleeved at the first annular groove 13, the rubber pull ring 9 can be fixed to prevent it from being lost when not in use.

[0022] As Figure 2 shown in the figure, a second annular groove 15 is formed inside the vent plug housing 1. An oil mist filter element 14 for filtering impurities is provided inside the second annular groove 15. The oil mist filter element 14 can further prevent impurities from penetrating into the speed reducer.

[0023] As Figure 3 shown in the figure, a pressing plate 12 for restricting the position of the first pull ring 92 is fixedly connected to the top end of the support column 11. The pressing plate 12 can press the first pull ring 92 so that the first pull ring 92 fits against the top surface of the nut 8, resulting in a better sealing effect.

[0024] Working principle of the present utility model: When the speed reducer is in operation, first remove the first pull ring 92 from the support column 11. When the pressure inside the speed reducer is too high, the pressure inside the speed reducer will push the plug ball 4 upward. At this time, the gas will be discharged outward through the gap formed between the plug ball 4 and the second vent passage 3 for pressure relief, preventing the oil mist inside the speed reducer from bursting out due to excessive pressure. Then, the gas is discharged into the vent plug cover 6 through the second vent passage 3, then discharged through the vent hole 7, and finally discharged to the outside through the inner hole of the nut 8.

[0025] When the speed reducer is not in operation, put the first pull ring 92 on the support column 11 at this time. The top end of the nut 8 is sealed by the first pull ring 92, preventing impurities from entering the speed reducer through the opening of the nut 8 when the speed reducer is not in operation.

[0026] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A breather plug for a speed reducer, comprising a breather plug housing (1), characterized in that: Inside the vent plug housing (1), there is a first vent passage (2). A second vent passage (3) is formed inside the vent plug housing (1). The second vent passage (3) is concave. The first vent passage (2) communicates with the second vent passage (3). An elastic plugging device is provided inside the second vent passage (3). The elastic plugging device includes a plug ball (4). The plug ball (4) is stuck at the notch inside the passage of the second vent passage (3). The top end of the plug ball (4) is fixedly connected to a spring (5). The outer wall at the top of the vent plug housing (1) is threadedly connected to a vent plug cover (6). The top end of the spring (5) is fixedly connected to the upper part of the inner wall of the vent plug cover (6). A vent hole (7) is formed at the center of the vent plug cover (6). A nut (8) is fixedly connected to the top surface of the vent plug cover (6). The vent hole (7) communicates with the inner cavity of the nut (8). A detachable sealing device is provided at the top of the nut (8).

2. The breather plug for a speed reducer according to claim 1, characterized in that: The sealing device includes a fixing plate (10). The fixing plate (10) is fixed inside the inner cavity of the nut (8). A support column (11) is fixedly connected to the top surface of the fixing plate (10). A rubber pull ring (9) for sealing the opening of the nut (8) is sleeved on the outer wall of the support column (11).

3. The breather plug for a speed reducer according to claim 2, characterized in that: The rubber pull ring (9) includes a first pull ring (92) for sealing the opening at the top end of the nut (8). A rubber connecting plate (91) is fixedly connected to the outer wall of the first pull ring (92). The end of the rubber connecting plate (91) away from the first pull ring (92) is detachably connected to the vent plug housing (1).

4. The breather plug for a speed reducer according to claim 3, wherein: A first annular groove (13) is formed on the top surface of the vent plug housing (1). A second pull ring (93) is fixedly connected to the end of the rubber connecting plate (91) away from the first pull ring (92). The second pull ring (93) is sleeved at the first annular groove (13).

5. The breather plug for a speed reducer according to claim 3, characterized in that: A pressing plate (12) for restricting the position of the first pull ring (92) is fixedly connected to the top end of the support column (11).

6. The breather plug for a speed reducer according to claim 1, characterized in that: A second annular groove (15) is formed inside the vent plug housing (1). An oil mist filter element (14) for filtering impurities is provided inside the second annular groove (15).

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