CN117028533A - Ventilation plug and transmission - Google Patents

Abstract

The invention belongs to parts of a transmission, and provides a vent plug, the transmission, and the vent plug, which comprise a plug cap and a core body, in order to solve the technical problems that the existing vent plug structure is difficult to meet the current and future transmission requirements in terms of dust prevention, water vapor prevention, oil blocking, space and the like. The plug cap is sleeved at the upper end of the core body, and the lower end of the core body is hermetically arranged in the ventilation plug hole of the transmission shell. The core body is in a hollow column shape, and the hollow structure in the core body is marked as a cavity. The side wall of the core body is provided with a first vent hole, a second vent hole and an oil return hole, the outer wall of the core body is provided with at least one first annular boss and at least one second annular boss, and the side wall of the upper end of the core body is provided with a vent channel. The first annular boss is provided with a first opening, and the second annular boss is provided with a second opening. The lower end of the cavity, the first vent hole, the first opening, the second vent hole, the upper end of the cavity, the vent channel and the second opening are sequentially communicated to form a gas passage.

Description

Ventilation plug and transmission

Technical Field

The invention belongs to parts of a transmission, and relates to a vent plug and the transmission.

Background

When the transmission works, the temperature in the box body can be increased continuously, and the air pressure in the box body is increased. Under continuous high pressure, sealing performance of sealing parts of the transmission, such as an oil seal and the like, is gradually reduced, so that oil seepage of the transmission occurs. To solve this problem, the transmissions are all fitted with vent plugs. Three main functions of the vent plug are: 1. the interior of the speed changer is communicated with the external atmosphere, so that the interior of the speed changer is balanced with the external air pressure; 2. dust or moisture in the external atmosphere is prevented from entering the transmission; 3. the oil mist inside the transmission is blocked from being discharged out of the transmission, the loss of lubricating oil is reduced, and the oil mist is prevented from polluting the atmosphere. Therefore, the vent plug of the automobile transmission has the functions of dust prevention and oil leakage prevention besides the function of ventilation with the outside.

Currently, the vent plugs on the market mainly have the following problems:

1. the effect of preventing external dust and water vapor from entering the interior of the transmission is poor;

2. when the transmission gear runs at a high speed, gear oil is easy to splash under stirring, so that part of oil is splashed around the vent plug, and oil seepage can occur if the vent plug is insufficient in oil blocking function;

3. the oil blocking structure is required to be matched in the transmission shell, so that the carrying space of the transmission can be affected.

With the advent of the electrified era, the space requirements, the sealing performance and the like of the transmission are higher and higher for automobiles, and the current transmission vent plug structure is difficult to meet the current and future transmission requirements.

Disclosure of Invention

The invention provides a vent plug and a transmission, which aim to solve the technical problems that the existing vent plug structure is difficult to meet the current and future transmission requirements in the aspects of dust prevention, water vapor prevention, oil blocking, space and the like.

In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:

a vent plug comprising a plug cap and a core;

the plug cap is sleeved at the upper end of the core body, and the lower end of the core body is hermetically arranged in the ventilation plug hole of the transmission shell;

the hollow structure in the core body is marked as a cavity, and the lower end of the cavity is communicated with the inside of the ventilation plug hole of the transmission shell;

the side wall of the core body is provided with a first vent hole, a second vent hole and an oil return hole, the oil return hole is positioned at the lowest part, the outer wall of the core body is provided with at least one first annular boss and at least one second annular boss, and the side wall of the upper end of the core body is provided with a vent channel; the first annular boss is provided with a first opening, and the second annular boss is provided with a second opening;

the lower end of the cavity, the first vent hole, the first opening, the second vent hole, the upper end of the cavity, the vent channel and the second opening are sequentially communicated to form a gas passage, and then are communicated with the outside atmosphere.

Further, a third annular boss and a buckle are further arranged on the outer wall of the core body;

the third annular boss is axially positioned between the first annular boss and the second annular boss, and the buckle is positioned on the lower end face of the core body;

the lower end face of the third annular boss is abutted against and sealed with the upper end face of the side wall of the ventilation plug hole of the transmission shell, and the upper end face of the buckle is abutted against the lower end face of the side wall of the ventilation plug hole of the transmission shell;

a gap is reserved between the lower end face of the plug cap and the upper end face of the third annular boss, so that a channel communicated between the gas passage and the external atmosphere is formed.

Further, the buckle is located core lower extreme terminal surface department, has offered a plurality of expansion grooves along circumference on the core lower extreme terminal surface.

Further, a first limiting step is arranged on the plug cap, and a second limiting step is arranged on the side wall of the cavity;

the first limiting step is matched with the second limiting step and is used for axially limiting and radially limiting the plug cap relative to the core body; a gap is reserved between the first limiting step and the second limiting step, so that a channel between the upper end of the cavity in the gas passage and the ventilation channel is formed.

Further, a plurality of grooves are uniformly formed in the upper end face of the core body along the circumferential direction, so that the ventilation channel is formed.

Further, the plug cap comprises a cap body and a limiting body connected to the inside of the cap body;

the top surface inside the cap body is propped against the upper end surface of the core body, and the limiting body extends into the cavity;

the first limiting step is arranged on the outer side wall of the limiting body;

a gap is reserved between the lower end face of the cap body and the upper end face of the third annular boss, so that a channel communicated between the gas passage and the external atmosphere is formed.

Further, two first annular bosses and two second annular bosses are arranged, the first annular bosses are propped against the inner wall of the ventilation plug hole of the transmission shell, and the second annular bosses are propped against the inner wall of the cap body;

the first openings and the second openings are provided with a plurality of openings and are uniformly distributed along the circumferential direction of the corresponding annular boss;

the first openings on the two first annular bosses are staggered; the second openings on the two second annular bosses are arranged in a staggered mode.

Further, a fourth annular boss is arranged on the side wall of the lower end of the core body;

the lower end face of the fourth annular boss is propped against the mounting step on the inner wall of the ventilation plug hole of the transmission shell.

Further, the first vent hole and the oil return hole are both positioned on the fourth annular boss.

The invention also provides a speed changer, which comprises a speed changer body and a vent plug;

the ventilation plug adopts the ventilation plug.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention provides a ventilation plug, which is characterized in that a gas passage formed by the lower end of a cavity, a first ventilation hole, a first opening, a second ventilation hole, the upper end of the cavity, a ventilation passage and a second opening is formed by skillfully designing the structure of a core body, so that the ventilation passage with a labyrinth structure is obtained. Simultaneously, the lower terminal surface of first annular boss can make oil gas desublimation become liquid, flows back to the derailleur cavity through the oil return opening in, makes the breather plug can also realize keeping off oil when ventilating, reduces the fluid evaporation in the derailleur cavity. In addition, the setting of cock cap not only can cooperate the ventilation, can also prevent that outside dust of derailleur, moisture etc. from getting into inside the derailleur by means of labyrinth structure's passageway of ventilating. Therefore, the functions of ventilation, oil blocking and dust prevention are integrated on the ventilation plug, and compared with the prior art, the oil blocking structure is not required to be designed in the transmission shell, the carrying space of the transmission is further optimized, and the requirements of the current and future transmissions can be met.

2. According to the invention, the third annular boss buckle is used for sealing between the core body and the transmission shell, so that oil gas leakage is avoided, and the adjustment of the self structure of the core body is realized.

3. The end face of the lower end of the core body is provided with the telescopic groove, so that the core body can be conveniently installed in the ventilation plug hole of the transmission shell, and the buckle can pass through the ventilation plug hole of the transmission shell.

4. According to the invention, the axial and radial positions of the plug cap are limited by the cooperation of the first limiting step and the second limiting step, so that the mounting reliability of the plug cap is ensured, and the air blocking effect is not influenced.

5. According to the invention, two first annular bosses and two second annular bosses are arranged, the first openings of the two first annular bosses are arranged in a staggered manner, and the second openings of the two second annular bosses are also arranged in a staggered manner.

6. The invention also provides a transmission, and the ventilation plug has the effects of improving the sealing performance and prolonging the service life of the sealing part of the transmission and reducing the occurrence of oil seepage.

Drawings

For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a second embodiment of the present invention;

FIG. 2 is a schematic diagram of a core structure in a second embodiment of the present invention;

FIG. 3 is a schematic view of a plug cap according to a second embodiment of the present invention;

FIG. 4 is a schematic illustration of a portion of a transmission housing according to a second embodiment of the present invention;

FIG. 5 is a schematic diagram of the flow of gas in a second embodiment of the present invention; wherein the arrows indicate the direction of gas flow.

Wherein: 1-core body, 2-plug cap, 201-cap body, 202-spacing body, 3-transmission casing ventilation plug hole, 4-buckle, 5-oil gallery, 6-first air vent, 7-first spacing step, 8-second spacing step, 9-second annular boss, 10-first opening, 11-second air vent, 12-third annular boss, 13-first annular boss, 14-second opening, 15-fourth annular boss, 16-installation step, 17-ventilation channel, 18-inside top surface of cap body, 19-expansion groove, 20-transmission casing.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The invention provides the vent plug with ingenious structure, and the functions of ventilation, dust prevention, water blocking and oil blocking are integrated on the vent plug, so that a special oil blocking structure is not required to be designed in the transmission shell, the carrying space of the transmission is optimized, the casting complexity is reduced, and the dust prevention, water blocking and oil blocking effects are improved.

The invention will be described in further detail with reference to the accompanying drawings and some embodiments of the invention:

example 1

A vent plug comprising a plug cap 2 and a core 1. The plug cap 2 is sleeved at the upper end of the core body 1, the lower end of the core body 1 is hermetically arranged in the ventilation plug hole 3 of the transmission shell, and oil gas is prevented from overflowing through other channels, so that oil liquid in the transmission is prevented from evaporating. The core body 1 is in a hollow column shape, the hollow structure in the core body 1 is marked as a cavity, and the lower end of the cavity is communicated with the inside of the transmission shell ventilation plug hole 3. The side wall of the core body 1 is provided with a first vent hole 6, a second vent hole 11 and an oil return hole 5, the oil return hole 5 is positioned at the lowest part, the outer wall of the core body 1 is provided with at least one first annular boss 13 and at least one second annular boss 9, and the side wall of the upper end of the core body 1 is provided with a vent channel 17. The first annular boss 13 is provided with a first opening 10, and the second annular boss 9 is provided with a second opening 14. The number of the first annular boss 13 and the second annular boss 9 can be adjusted according to actual needs, if the flow path of the gas is more complex, the corresponding number can be increased, and if the processing difficulty, the cost and the ventilation efficiency are considered, the number of the first annular boss 13 and the second annular boss 9 can be reduced.

Finally, the lower end of the cavity, the first ventilation hole 6, the first opening 10, the second ventilation hole 11, the upper end of the cavity, the ventilation channel 17 and the second opening 14 are sequentially communicated to form a gas passage, and when ventilation is performed, gas flows along the gas passage, and the second opening 14 is communicated with the external atmosphere, so that the gas is finally communicated to the external atmosphere.

Example two

As shown in fig. 1, a preferred embodiment of the transmission of the present invention includes a transmission body and a vent plug. Wherein the vent plug comprises a plug cap 2 and a core 1, the transmission body is provided with a transmission housing vent plug hole 3 for mounting the vent plug, a part of the transmission housing 20 is shown in fig. 1, only for showing the transmission housing vent plug hole 3.

As shown in fig. 2, two first annular bosses 13, two second annular bosses 9, a third annular boss 12, a buckle 4 and a fourth annular boss 15 are provided on the outer wall of the core 1.

The third annular boss 12 is located between the two first annular bosses 13 and the two second annular bosses 9 along the axial direction, the buckle 4 is located at the lower end face of the core body 1, the fourth annular boss 15 is adjacent to the first annular boss 13, and the fourth annular boss 15 is located below the first annular boss 13 close to the lower end of the core body 1.

The lower end face of the third annular boss 12 abuts against and seals with the upper end face of the side wall of the transmission housing ventilation plug hole 3, the upper end face of the buckle 4 abuts against the lower end face of the side wall of the transmission housing ventilation plug hole 3, axial positioning is carried out, and the lower end face of the fourth annular boss 15 abuts against the mounting step 16 on the inner wall of the transmission housing ventilation plug hole 3. As shown in fig. 4, the mounting step 16 is a structure within the transmission case 20. In addition, the first annular boss 13 abuts against the inner wall of the ventilation plug hole 3 of the transmission housing, and the second annular boss 9 abuts against the inner wall of the cap 201, so that gas is prevented from passing through the first annular boss. The core body 1 is stably and reliably arranged in the ventilation plug hole 3 of the transmission shell through the third annular boss 12, the fourth annular boss 15 and the first annular boss 13. The core 1 is positioned and sealed by the third annular boss 12 and the catch 4. Due to the fact that the clamping buckles 4 are arranged, the clamping buckles 4 are located at the end face of the lower end of the core body 1, four telescopic grooves 19 are formed in the end face of the lower end of the core body 1 along the circumferential direction, and when the core body 1 is installed in the ventilation plug hole 3 of the transmission shell, due to the fact that the telescopic grooves 19 are arranged, the lower end of the core body 1 can retract inwards, and the clamping buckles 4 can reach the installation position through the ventilation plug hole 3 of the transmission shell. In other embodiments of the present invention, the number of the expansion slots 19 may be reasonably adjusted, so as to ensure that the lower end of the core 1 can be contracted when being installed, and can be extended after being installed in place, and ensure the structural reliability of the lower end of the core 1. The first openings 10 are uniformly arranged in four along the circumferential direction of the first annular boss 13, the second openings 14 are uniformly arranged in four along the circumferential direction of the second annular boss 9, and the number can be adjusted according to actual needs. The upper end surface of the core body 1 is uniformly provided with a plurality of grooves along the circumferential direction to form a ventilation channel 17.

The second ventilation hole 11 is located between the third annular boss 12 and the first annular boss 13 near the upper end of the core body 1, and near the first annular boss 13. The first vent hole 6 and the oil return hole 5 are both positioned on the fourth annular boss 15, which is more beneficial to the backflow of oil.

As shown in fig. 3, the plug cap 2 includes a cap body 201, and a stopper 202 connected to the inside of the cap body 201. The top surface 18 inside the cap body is propped against the upper end surface of the core body 1, the limiting body 202 extends into the cavity, a first limiting step 7 is arranged on the outer side wall of the limiting body 202, a second limiting step 8 is arranged on the side wall of the cavity, the first limiting step 7 is matched with the second limiting step 8 and used for axially limiting and radially limiting the core body 1 relative to the plug cap 2, as a preferable scheme, the first limiting step 7 is a conical surface on the outer side wall of the limiting body 202, the second limiting step 8 is a bulge on the side wall of the cavity, and the bulge is positioned on the conical surface. In other embodiments of the present invention, the specific implementation manner of the first limiting step 7 and the second limiting step 8 may be different, as long as limiting can be achieved. In addition, a gap is reserved between the first limiting step 7 and the second limiting step 8, and a gap is reserved between the lower end face of the cap body 201 and the upper end face of the third annular boss 12.

As the arrows in fig. 5 indicate the gas flow direction, the flow process of the gas when ventilation is performed in the second embodiment is as follows:

the gas inside the transmission shell 20 enters the core body 1 from the lower end of the cavity, flows out from the first vent hole 6, sequentially passes through the first openings 10 of the two first annular bosses 13 from bottom to top, and enters the cavity again from the second vent hole 11, when oil gas inside the transmission shell 20 passes through the space between the two first annular bosses 13 and the space between the first annular bosses 13 and the second annular bosses 12, the oil gas can be sublimated into liquid at the lower end surfaces of the two first annular bosses 13 and the second annular bosses 12, and flows back into the transmission shell 20 through the oil return hole 5, and the three-layer bosses can separate the oil gas entering the vent plug for three times, so that the oil evaporation in the transmission shell 20 is effectively reduced. The gas flows out of the cavity through the ventilation channel 17 through the gap between the first limit step 7 and the second limit step 8 in the cavity, sequentially passes through the second openings 14 of the two second annular bosses 9, and finally is discharged to the atmosphere through the gap between the lower end face of the cap 201 and the upper end face of the third annular boss 12.

According to the invention, through ingenious structural design, the ventilation route of the labyrinth structure is arranged, dust, moisture and the like outside the transmission can be prevented from entering the transmission while ventilation is performed, and the functions of ventilation, dust prevention and water blocking are realized. In addition, the functions of ventilation, dust prevention, water blocking and oil blocking are integrated on the ventilation plug, a special oil blocking structure is not required to be designed in the transmission shell 20, and the transmission carrying space is optimized.

The structure of the vent plug in the second embodiment of the present invention can also be used alone as an embodiment of the vent plug. The vent plug structure in the first embodiment is used in a transmission, and accordingly, a basic embodiment of the transmission of the present invention can be obtained. In addition, in other embodiments of the present invention, the limiting manner, the mounting manner, the number of first annular bosses 13, the second annular bosses 9, etc. in the vent plug may be adjusted.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A vent plug, characterized by: comprises a plug cap (2) and a core body (1);

the plug cap (2) is sleeved at the upper end of the core body (1), and the lower end of the core body (1) is hermetically arranged in the transmission shell ventilation plug hole (3);

the core body (1) is in a hollow column shape, the hollow structure in the core body (1) is marked as a cavity, and the cavity is communicated with the inside of the transmission shell ventilation plug hole (3);

the side wall of the core body (1) is provided with a first vent hole (6), a second vent hole (11) and an oil return hole (5), the oil return hole (5) is positioned at the lowest part, the outer wall of the core body (1) is provided with at least one first annular boss (13) and at least one second annular boss (9), and the side wall of the upper end of the core body (1) is provided with a vent channel (17); a first opening (10) is formed in the first annular boss (13), and a second opening (14) is formed in the second annular boss (9);

the lower end of the cavity, the first vent hole (6), the first opening (10), the second vent hole (11), the upper end of the cavity, the vent channel (17) and the second opening (14) are sequentially communicated to form a gas passage, and then are communicated with the outside atmosphere.

2. A vent plug according to claim 1, wherein: the outer wall of the core body (1) is also provided with a third annular boss (12) and a buckle (4);

the third annular boss (12) is axially positioned between the first annular boss (13) and the second annular boss (9), and the buckle (4) is positioned on the lower end face of the core body (1);

the lower end face of the third annular boss (12) is abutted against and sealed with the upper end face of the side wall of the transmission housing ventilation plug hole (3), and the upper end face of the buckle (4) is abutted against the lower end face of the side wall of the transmission housing ventilation plug hole (3);

a gap is reserved between the lower end face of the plug cap (2) and the upper end face of the third annular boss (12), so that a channel communicated between the gas passage and the external atmosphere is formed.

3. A vent plug according to claim 2, wherein:

the buckle (4) is located at the end face of the lower end of the core body (1), and a plurality of telescopic grooves (19) are formed in the end face of the lower end of the core body (1) along the circumferential direction.

4. A vent plug according to any one of claims 1 to 3, wherein:

a first limit step (7) is arranged on the plug cap (2), and a second limit step (8) is arranged on the side wall of the cavity;

the first limiting step (7) is matched with the second limiting step (8) and is used for axially limiting and radially limiting the plug cap (2) relative to the core body (1); a gap is reserved between the first limiting step (7) and the second limiting step (8), and a channel between the upper end of the cavity in the gas passage and the ventilation channel (17) is formed.

5. A vent plug according to claim 4, wherein: the upper end face of the core body (1) is uniformly provided with a plurality of grooves along the circumferential direction to form the ventilation channel (17).

6. A vent plug according to claim 5, wherein: the plug cap (2) comprises a cap body (201) and a limiting body (202) connected to the inside of the cap body (201);

the top surface (18) inside the cap body is propped against the upper end surface of the core body (1), and the limiting body (202) extends into the cavity;

the first limiting step (7) is arranged on the outer side wall of the limiting body (202);

a gap is reserved between the lower end face of the cap body (201) and the upper end face of the third annular boss (12), so that a channel communicated between the gas passage and the external atmosphere is formed.

7. A vent plug according to claim 6, wherein:

the two first annular bosses (13) and the two second annular bosses (9) are respectively arranged, the first annular bosses (13) are propped against the inner wall of the ventilation plug hole (3) of the transmission shell, and the second annular bosses (9) are propped against the inner wall of the cap body (201);

the first openings (10) and the second openings (14) are provided with a plurality of openings and are uniformly distributed along the circumferential direction of the corresponding annular boss;

the first openings (10) on the two first annular bosses (13) are arranged in a staggered manner; the second openings (14) on the two second annular bosses (9) are arranged in a staggered mode.

8. A vent plug according to claim 7, wherein: a fourth annular boss (15) is arranged on the side wall of the lower end of the core body (1);

the lower end face of the fourth annular boss (15) is propped against a mounting step (16) on the inner wall of the ventilation plug hole (3) of the transmission shell.

9. A vent plug according to claim 8, wherein: the first vent hole (6) and the oil return hole (5) are both positioned on the fourth annular boss (15).

10. A transmission includes a transmission body and a vent plug; the method is characterized in that:

the vent plug employing any one of claims 1 to 9.