CN115854003A - Gearbox breather plug and mounting structure thereof - Google Patents

Abstract

The invention discloses a gearbox vent plug and a mounting structure thereof, wherein the gearbox vent plug comprises a base, a lower connecting part and an upper connecting part, wherein the upper part of the lower connecting part is coaxially fixed in the base; the exhaust passage has been seted up on the lateral part surface of base, the inside of lower connecting portion with the inside of upper connecting portion all is provided with the labyrinth oil gas passageway of mutual intercommunication, the base the lower connecting portion with the overall structure internal fixation that upper connecting portion constitute with labyrinth oil gas passageway intercommunication, the filter screen that is used for filtering and separation oil gas. The ventilation plug of the gearbox and the mounting structure thereof integrate the functions of filtering, obstructing, refluxing and exhausting. When the vent plug separates and reflows lubricating oil and gas, an exhaust channel of an inner cavity of the gearbox is always communicated with the atmosphere, and the inner cavity of the gearbox is decompressed.

Description

Gearbox breather plug and mounting structure thereof

Technical Field

The invention relates to the technical field of automobile parts, in particular to a gearbox vent plug and an installation structure thereof.

Background

The main function of the vehicle gearbox is to change the transmission ratio, expand the variation range of the torque and the rotating speed of the driving wheel so as to adapt to the frequently changing running conditions, and simultaneously enable the engine to work under the working conditions of higher power and lower oil consumption. Usually, a multi-stage gear transmission structure is arranged in the gearbox, and the speed change and torque change are generated through different gear combinations. Transmission oil is used to lubricate and clean various components in the transmission and to efficiently transfer torque in a timely manner. And the inside atmospheric pressure of gearbox box can change along with the operating condition, and at the gearbox during operation, the operation of gear drive structure can produce great heat, and the inside air of box is heated the inflation, leads to the inside atmospheric pressure of box to rise, and when the gearbox stop work, the inside atmospheric pressure of box can reduce gradually. In order to prevent the internal air of the gearbox from being heated and expanded to damage the sealing of the gearbox, a vent plug is usually arranged on the gearbox casing, so that the inside of the gearbox casing is communicated with the outside, and the internal and external air pressures of the gearbox are balanced.

The patent with the application number of 202123058883.6 and the name of 'a vent plug for preventing water inflow and oil injection of a gearbox' discloses a vent plug for preventing water inflow and oil injection of the gearbox, which comprises a main structure body, a first layer of oil baffle plate, an O-shaped ring, a second layer of oil baffle plate, a breathable film paper fixing seat, breathable film paper and an end cover, wherein a boss is arranged in the middle of the main structure body, one side of the boss is of a threaded structure, and the other end of the boss is provided with the end cover; a first layer of oil baffle plate and a second layer of oil baffle plate are arranged at one end of the inner cavity of the main structure, and breathable film paper is arranged at the other end of the inner cavity of the main structure; the breathable film paper is fixed through the breathable film paper fixing seat.

The patent with the application number of 202220685022.6 entitled "a vent plug and gearbox" discloses a vent plug and gearbox, wherein the vent plug comprises a sleeve, a vent cap and a vent pipe, the sleeve comprises a first communicating pipe used for communicating the gearbox and a second communicating pipe integrally connected with the first communicating pipe, and the vent cap is integrally connected with the vent pipe and detachably connected with the second communicating pipe through the vent pipe; the ventilation cap comprises an inner tube and an outer cover, wherein the inner tube extends outwards from one end of the ventilation tube, the outer cover is covered on the end face of the inner tube, a gap is formed between the outer cover and the outer side wall of the inner tube at intervals, a plurality of exhaust holes which are right opposite to the gap are formed in the inner tube in an annular array mode, and the aperture of the exhaust holes which are located on the inner side of the inner tube is larger than the aperture of the outer side of the inner tube.

Present gearbox breather plug is a single channel design of advancing one and going out usually, gets into inlet channel when lubricated oil gas, and when the passageway blockked up and just ventilate and have lubricating oil in the plug, lubricating oil flows out from ventilating the plug, can't flow back to inside the gearbox. Receive the restriction of gearbox inner space, the gearbox breather plug air inlet is closer apart from stirring oil parts such as gear, can directly get rid of lubricating oil in the breather plug when the gear stirs oil, so arranged the separation structure in the periphery of breather plug. When the gearbox adopts gas accuse to shift, perhaps when matching the power takeoff that gas accuse was shifted, perhaps when matching the retarber, perhaps when disposing the air compressor machine, the problem of blowby often appears, and the inside gearbox internal pressure that leads to of highly-compressed air entering gearbox in the gas circuit system risees, and lubricating oil flows along the breather plug passageway, causes the gearbox oil leak.

Disclosure of Invention

The invention aims to solve the defects of the background technology and provide a gearbox vent plug and a mounting structure thereof, wherein the gearbox vent plug can be used for blocking, filtering and refluxing oil gas and avoiding blow-by and oil leakage of a gearbox.

In order to achieve the purpose, the vent plug of the gearbox comprises a base, a lower connecting part and an upper connecting part, wherein the upper part of the lower connecting part is coaxially fixed in the base, and the bottom of the upper connecting part is coaxially fixed at the top of the base; the exhaust passage has been seted up on the lateral part surface of base, the inside of lower connecting portion with the inside of last connecting portion all is provided with the labyrinth oil gas passageway of mutual intercommunication, the base the lower connecting portion with the overall structure internal fixation that the last connecting portion constitute with labyrinth oil gas passageway intercommunication, be used for filtering and the filter screen of separation oil gas.

Furthermore, the bottom of the upper connecting part and the bottom of the lower connecting part are both fixed with one filter screen.

Further, lower connecting portion include the columniform and connect the cylinder down, it includes the columniform and connects the cylinder on to go up connecting portion, the bottom of connecting the cylinder is coaxial to be seted up down the filter screen mounting hole down, the bottom of going up connecting the cylinder is coaxial to be seted up and to be gone up the filter screen mounting hole, the filter screen is including coaxial being fixed in lower filter screen in the filter screen mounting hole is with coaxial being fixed in go up the last filter screen in the filter screen mounting hole.

Furthermore, lower circumferential oil passing holes are formed in the lower filter screen at intervals in the circumferential direction, and a lower middle oil passing hole is formed in the middle of the lower filter screen; the upper filter screen is circumferentially provided with upper circumferential oil passing holes at intervals, and the middle part of the upper filter screen is provided with upper middle oil passing holes; the aperture of the lower middle oil passing hole is larger than that of the upper middle oil passing hole.

Furthermore, a lower labyrinth oil-gas passage communicated with the lower circumferential oil passing hole is formed in the lower connecting column body, and an upper labyrinth oil-gas passage communicated with the upper circumferential oil passing hole is formed in the upper connecting column body.

Furthermore, a lower insertion cylinder which is used for being inserted into the base is coaxially fixed at the top of the lower connection cylinder, the lower insertion cylinder and the lower connection cylinder are of an integral structure, and a lower axial oil passing hole communicated with the lower middle oil passing hole is formed in the middle of the lower connection part along the axial direction of the middle of the lower connection part.

Further, the base is including coaxial being fixed in go up the base ring of connecting the cylinder bottom, the top surface of base ring with go up connect between the bottom surface of cylinder exist with go up the oily passageway of mistake of circumference oilhole intercommunication, the coaxial fixedly connected with in lower part central authorities of base ring with the base cylinder of base ring structure as an organic whole, coaxial being fixed with in the base cylinder with insert cylinder complex base buckle down.

Furthermore, the middle part of the base buckle is provided with a buckle hole matched with the lower inserted cylinder, the circumferential interval of the buckle hole is connected with buckle grooves arranged along the radial direction of the buckle hole, and the top of the lower inserted cylinder is coaxially and fixedly connected with a lower boss which is integrated with the lower boss.

Furthermore, the upper connecting part also comprises an upper inserting cylinder coaxially fixed at the center of the upper connecting cylinder, the center of the upper connecting part is coaxially provided with an upper axial oil passing hole communicated with the upper middle oil passing hole, and the top of the upper inserting cylinder is coaxially fixed with an upper boss which is of an integral structure with the upper inserting cylinder.

Furthermore, the mounting structure of the ventilation plug of the gearbox comprises the gearbox and the ventilation plug of the gearbox, a ventilation plug mounting hole is formed in the gearbox, the base is arranged in the ventilation plug mounting hole, the lower connecting part is located in the gearbox, the upper connecting part is located outside the gearbox, the top of the upper connecting part is connected with a corrugated return pipe communicated with a labyrinth type oil-gas channel of the upper connecting part, and the two ends of the exhaust channel are respectively located inside and outside the gearbox.

The beneficial effects of the invention are: the ventilation plug of the gearbox and the mounting structure thereof integrate the functions of filtering, obstructing, refluxing and exhausting. When near the plug air inlet was directly got rid of to lubricating oil by rotating parts such as gears, the lower part of breather plug can carry out the separation to lubricating oil, when the air-oil mixture got into the breather plug, was filtered lubricated oil gas by the filter screen, and the rethread labyrinth oil gas passageway carries out one-level and second grade separation, backward flow to the oil-gas mixture, carries out tertiary separation, backward flow to lubricated oil gas through adjustable length's corrugated return pipe at last. The exhaust passage of the inner cavity of the gearbox is communicated with the atmosphere all the time when the vent plug separates and reflows lubricating oil gas, so that the inner cavity of the gearbox is decompressed, the probability of the condition that a large amount of lubricating oil enters the air inlet of the vent plug due to the limitation of the installation space is greatly reduced, and the problems of oil pressure rising of the inner cavity of the gearbox and oil leakage of the vent plug due to the air blow-by problem are solved. The venting plug has compact structure and large discharge capacity, and is convenient to disassemble and assemble through a buckle structure.

Drawings

FIG. 1 is an axial cross-sectional view of a transmission vent plug according to the present invention;

FIG. 2 is an axial cross-sectional view of the lower connecting portion of the present invention;

FIG. 3 is a bottom view of the lower connecting portion of the present invention;

FIG. 4 is an axial cross-sectional view of the base of the present invention;

FIG. 5 is a bottom view of the base of the present invention;

FIG. 6 is a top view of the base of the present invention;

FIG. 7 is an axial cross-sectional view of the upper link of the present invention;

FIG. 8 is a top view of a lower screen of the present invention;

FIG. 9 is a top view of the upper screen of the present invention;

FIG. 10 is a front view of a transmission vent plug coupled to a bellows type return tube in accordance with the present invention;

FIG. 11 is a schematic view of the installation structure of the breather plug of the transmission according to the present invention;

FIG. 12 is a first schematic view of the flow of oil and gas into the breather plug of the present invention;

FIG. 13 is a second schematic view of the flow of oil and gas into the breather plug of the present invention;

FIG. 14 is a third schematic view of the flow of oil and gas into the breather plug of the present invention;

FIG. 15 is a schematic exhaust flow of the vent plug of the present invention;

FIG. 16 is a first schematic view of the flow of oil and gas back into the transmission through the vent plug according to the present invention;

FIG. 17 is a second schematic flow diagram of oil and gas flowing back into the transmission through the vent plug according to the present invention;

wherein, 1-lower connecting portion (1.1-lower connecting cylinder, 1.2-lower insert cylinder), 2-base (2.1-base ring, 2.2-base cylinder, 2.3-base buckle), 3-lower connecting portion (3.1-upper connecting cylinder, 3.2-upper insert cylinder), 4-lower filter screen (4.1-lower circumferential oil through hole, 4.2-lower middle oil through hole), 5-upper filter screen (5.1-upper circumferential oil through hole, 5.2-upper middle oil through hole), 6-lower labyrinth oil gas channel, 7-upper labyrinth oil gas channel, 8-lower axial oil through hole, 9-oil through channel, 10-buckle hole, 11-buckle groove, 12-lower boss, 13-upper axial oil through hole, 14-upper boss, 15-lower filter screen mounting hole, 16-upper filter screen mounting hole, 17-gearbox, 18-breather plug mounting hole, 19-ripple type return pipe, 20-exhaust groove, 21-exhaust channel.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The transmission case vent plug shown in fig. 1-9 comprises a base 2, a lower connecting part 1 with the upper part coaxially fixed in the base 2 and an upper connecting part 3 with the bottom coaxially fixed at the top of the base 2; exhaust passage 21 has been seted up on the lateral part surface of base 2, and the inside of lower connecting portion 1 and the inside of last connecting portion 3 all are provided with the labyrinth oil gas passageway of mutual intercommunication, and the overall structure internal fixation that base 2, lower connecting portion 1 and last connecting portion 3 constitute has with labyrinth oil gas passageway intercommunication, is used for filtering and the filter screen of separation profit.

Specifically, a filter screen is fixed at the bottom of the upper connecting part 3 and the bottom of the lower connecting part 1. The lower connecting part 1 comprises a cylindrical lower connecting cylinder 1.1, a lower filter screen mounting hole 15 is coaxially formed in the bottom of the lower connecting cylinder 1.1, and the filter screen comprises a lower filter screen 4 which is coaxially fixed in the lower filter screen mounting hole 15. The lower circumferential oil passing holes 4.1 are formed in the lower filter screen 4 at intervals in the circumferential direction, and the lower middle oil passing holes 4.2 are formed in the middle of the lower filter screen; the top of the lower connecting column body 1.1 is coaxially fixed with a lower inserting column body 1.2 used for being inserted into the base 2, the lower inserting column body 1.2 and the lower connecting column body 1.1 are of an integral structure, and the middle part of the lower connecting part 1 is provided with a lower axial oil passing hole 8 communicated with the lower middle oil passing hole 4.2 along the axial direction. As shown in fig. 3, a lower labyrinth oil-gas passage 6 communicated with the lower circumferential oil passing hole 4.1 is arranged in the lower connecting column 1.1,

the upper connecting part 3 comprises a cylindrical upper connecting cylinder 3.1, an upper filter screen mounting hole 16 is coaxially formed in the bottom of the upper connecting cylinder 3.1, and the filter screen comprises an upper filter screen 5 which is coaxially fixed in the upper filter screen mounting hole 16. The upper filter screen 5 is provided with upper circumferential oil passing holes 5.1 at intervals in the circumferential direction, and the middle part is provided with upper middle oil passing holes 5.2. An upper labyrinth oil-gas channel 7 (same as the oil-gas channel in the figure 3) communicated with the upper circumferential oil-passing hole 5.1 is arranged in the upper connecting column 3.1. An upper inserting cylinder 3.2 is coaxially fixed in the center of the upper connecting cylinder 3.1, an upper axial oil passing hole 13 communicated with the upper middle oil passing hole 5.2 is coaxially formed in the center of the upper connecting part 3, and an upper boss 14 which is of an integral structure with the upper inserting cylinder 3.2 is coaxially fixed at the top of the upper inserting cylinder 3.2.

As shown in fig. 8-9, the diameter of the lower middle oil passing hole 4.2 is larger than that of the upper middle oil passing hole 5.2.

The base 2 is including being fixed in the base ring 2.1 of connecting cylinder 3.1 bottom on the coaxial, the top surface of base ring 2.1 and last connecting cylinder 3.1 between the bottom surface exist with last circumference cross the oily passageway 9 of mistake of oilhole 5.1 intercommunication, the coaxial fixedly connected with in lower part central authorities of base ring 2.1 and base ring 2.1 be the base cylinder 2.2 of a body structure, coaxial fixed have with insert cylinder 1.2 complex base buckle 2.3 down in the base cylinder 2.2. The middle part of base buckle 2.3 is seted up and is inserted cylinder 1.2 complex buckle hole 10 down, and the circumference interval connection in buckle hole 10 has the buckle groove 11 of arranging along the radial direction in buckle hole 10, and the coaxial fixedly connected with in top that inserts cylinder 1.2 down rather than the lower boss 12 of structure as an organic whole.

The mounting structure of the ventilation plug of the gearbox shown in fig. 10-11 comprises a gearbox 17 and the ventilation plug of the gearbox, wherein a ventilation plug mounting hole 18 is formed in the gearbox 17, a base 2 is arranged in the ventilation plug mounting hole 18, a lower connecting part 1 is arranged in the gearbox 17, an upper connecting part 3 is arranged outside the gearbox 17, the top of the upper connecting part 3 is connected with a corrugated return pipe 19 communicated with a labyrinth type oil-gas channel of the upper connecting part 3, and two ends of an exhaust channel 21 formed on the surface of the side part of the base 2 are respectively arranged inside and outside the gearbox 17.

In the invention, lubricating oil cannot be directly thrown into the vent plug by the gear, and the labyrinth oil-gas channel in the vent plug is an oil-gas long exhaust channel. When the lubricating oil gas entering the breather plug is little, the air inlet and exhaust modes of the gearbox are shown in figure 12, and the oil return mode is shown in figure 16; as the amount of lubrication oil and gas entering the breather plug increases, the exhaust mode of the gearbox is converted into a combination of the exhaust modes shown in figures 12, 13 and 14, and the oil return mode is converted into a combination of the two modes shown in figures 16 and 17.

The ventilation plug of the gearbox and the mounting structure thereof integrate the functions of filtering, obstructing, refluxing and exhausting. When near the plug air inlet is directly got rid of by rotatory piece such as gear to lubricating oil, the lower part of breather plug can carry out the separation to lubricating oil, when the air-oil mixture gets into the breather plug, filters lubricated oil gas by the filter screen, and the rethread labyrinth oil gas passageway carries out one-level and second grade separation, backward flow to the oil-gas mixture, carries out tertiary separation, backward flow to lubricated oil gas through adjustable length's corrugated return pipe 19 at last. The exhaust passage of the inner cavity of the gearbox is communicated with the atmosphere all the time when the vent plug separates and reflows lubricating oil gas, so that the inner cavity of the gearbox is decompressed, the probability of the condition that a large amount of lubricating oil enters the air inlet of the vent plug due to the limitation of the installation space is greatly reduced, and the problems of oil pressure rising of the inner cavity of the gearbox and oil leakage of the vent plug due to the air blow-by problem are solved. The venting plug has compact structure and large discharge capacity, and is convenient to disassemble and assemble through a buckle structure.

Here, it should be noted that the description of the above technical solutions is exemplary, the present specification may be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the present invention is limited only by the scope of the claims. Where the terms "comprising", "having" and "including" are used in this specification, there may be another part or parts, and the terms used may generally be singular or may refer to plural forms. It should be noted that although the terms "first," "second," "top," "bottom," "side," "other," "end," "other end," and the like may be used and used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one element or section from another element or section. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with the top and bottom elements being interchangeable or switchable with one another, where appropriate, without departing from the scope of the present description; the components at one end and the other end may be of the same or different properties to each other.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the invention is not limited to the above-described embodiments, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit of the present invention should be considered to be within the scope of the present invention.

Claims (10)

1. A transmission vent plug, characterized by: comprises a base (2), a lower connecting part (1) with the upper part coaxially fixed in the base (2) and an upper connecting part (3) with the bottom coaxially fixed at the top of the base (2); exhaust passage (21) have been seted up on the lateral part surface of base (2), the inside of lower connecting portion (1) with the inside of going up connecting portion (3) all is provided with the labyrinth oil gas passageway of mutual intercommunication, base (2) lower connecting portion (1) with the overall structure internal fixation that goes up connecting portion (3) and constitute have with labyrinth oil gas passageway intercommunication, be used for filtering and the filter screen of separation oil gas.

2. The transmission vent plug of claim 1, wherein: the bottom of the upper connecting part (3) and the bottom of the lower connecting part (1) are both fixed with one filter screen.

3. The transmission vent plug of claim 2, wherein: lower connecting portion (1) are including columniform lower connection cylinder (1.1), go up connecting portion (3) and include columniform and go up connection cylinder (3.1), lower filter screen mounting hole (15) have been seted up to the bottom of connecting cylinder (1.1) is coaxial down, go up the coaxial filter screen mounting hole (16) of having seted up in bottom of connecting cylinder (3.1), the filter screen is including coaxial being fixed in lower filter screen (4) in filter screen mounting hole (15) and coaxial being fixed in go up filter screen (5) in filter screen mounting hole (16).

4. A transmission vent plug as defined in claim 3 wherein: lower circumferential oil passing holes (4.1) are formed in the lower filter screen (4) at intervals in the circumferential direction, and a lower middle oil passing hole (4.2) is formed in the middle of the lower filter screen; the upper filter screen (5) is provided with upper circumferential oil passing holes (5.1) at intervals in the circumferential direction, and the middle part of the upper filter screen is provided with upper middle oil passing holes (5.2); the aperture of the lower middle oil passing hole (4.2) is larger than that of the upper middle oil passing hole (5.2).

5. The transmission vent plug of claim 4, wherein: a lower labyrinth type oil-gas passage (6) communicated with the lower circumferential oil passing hole (4.1) is formed in the lower connecting cylinder body (1.1), and an upper labyrinth type oil-gas passage (7) communicated with the upper circumferential oil passing hole (5.1) is formed in the upper connecting cylinder body (3.1).

6. The transmission vent plug of claim 5, wherein: the top of lower connecting cylinder (1.1) is coaxially fixed with and is used for inserting lower insert cylinder (1.2) in base (2), lower insert cylinder (1.2) with connecting cylinder (1.1) structure as an organic whole down, the middle part of lower connecting portion (1) along its axial seted up with lower axial of lower middle part oil passing hole (4.2) intercommunication crosses oilhole (8).

7. The transmission vent plug of claim 6, wherein: base (2) are fixed in including coaxial going up base ring (2.1) of connecting cylinder (3.1) bottom, the top surface of base ring (2.1) with go up between the bottom surface of connecting cylinder (3.1) exist with go up oily passageway (9) of crossing of circumference oilhole (5.1) intercommunication, the lower part central authorities coaxial fixedly connected with of base ring (2.1) with base cylinder (2.2) that base ring (2.1) is the body structure, coaxial fixed in base cylinder (2.2) have with insert cylinder (1.2) complex base buckle (2.3) down.

8. The transmission vent plug of claim 7, wherein: the middle part of the base buckle (2.3) is provided with a buckle hole (10) matched with the lower insertion cylinder (1.2), the circumferential interval of the buckle hole (10) is connected with a buckle groove (11) arranged along the radial direction of the buckle hole (10), and the top of the lower insertion cylinder (1.2) is coaxially and fixedly connected with a lower boss (12) of an integrated structure.

9. The transmission vent plug of claim 4, wherein: the upper connecting portion (3) further comprises an upper inserting cylinder (3.2) which is coaxially fixed at the center of the upper connecting cylinder (3.1), an upper axial oil passing hole (13) communicated with the upper middle oil passing hole (5.2) is coaxially formed in the center of the upper connecting portion (3), and an upper boss (14) which is of an integral structure with the upper inserting cylinder is coaxially fixed at the top of the upper inserting cylinder (3.2).

10. A mounting structure of a transmission case breather plug, comprising a transmission case (17), characterized in that: the gearbox breather plug is characterized by further comprising the gearbox breather plug according to claims 1-9, wherein a breather plug mounting hole (18) is formed in the gearbox (17), the base (2) is arranged in the breather plug mounting hole (18), the lower connecting portion (1) is located in the gearbox (17), the upper connecting portion (3) is located outside the gearbox (17), the top of the upper connecting portion (3) is connected with a corrugated return pipe (19) communicated with a labyrinth oil-gas channel of the upper connecting portion (3), and two ends of the exhaust channel (21) formed in the surface of the side portion of the base (2) are located inside and outside the gearbox (17) respectively.

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