阅读说明：本技术 塞组件和储液箱 (Plug assembly and liquid storage tank ) 是由 俞正才 于 2019-11-13 设计创作，主要内容包括：提供一种塞组件和储液箱。塞组件用于密封储液箱的进液口和/或排液口,塞组件包括弹性塞,弹性塞包括头部、尾部和中间部,头部的至少一部分具有大于中间部的径向尺寸,尾部的至少一部分具有大于中间部的径向尺寸,头部用于与进液口和/或排液口的轴向内侧的内周缘连接,尾部用于与进液口和/或排液口的轴向外侧的外周缘连接,中间部连接头部和尾部并用于安装在进液口和/或排液口内,头部、尾部和中间部三者中的至少一者用于与进液口和/或排液口形成密封连接,头部和尾部能够限制弹性塞在进液口和/或排液口内沿进液口和/或排液口的轴向移动。该塞组件结构简单,密封可靠。(A plug assembly and a reservoir are provided. The plug assembly is used for sealing a liquid inlet and/or a liquid outlet of a liquid storage tank and comprises an elastic plug, the elastic plug comprises a head part, a tail part and a middle part, at least one part of the head part has a radial size larger than that of the middle part, the head part is used for being connected with the inner peripheral edge of the axial inner side of the liquid inlet and/or the liquid outlet, the tail part is used for being connected with the outer peripheral edge of the axial outer side of the liquid inlet and/or the liquid outlet, the middle part is connected with the head part and the tail part and is used for being installed in the liquid inlet and/or the liquid outlet, at least one of the head part, the tail part and the middle part is used for being in sealing connection with the liquid inlet and/or the liquid outlet, and the head part and the tail part can limit the elastic plug. The plug assembly is simple in structure and reliable in sealing.)

1. A plug assembly for sealing a liquid inlet and/or a liquid outlet of a tank, the plug assembly comprising a resilient plug (8) made of a resilient material, the resilient plug (8) comprising a head portion (3), a tail portion (4) and an intermediate portion (5), at least a portion of the head portion (3) having a radial dimension greater than the intermediate portion (5), at least a portion of the tail portion (4) having a radial dimension greater than the intermediate portion (5),

the head part (3) is used for being connected with the inner periphery of the axial inner side of the liquid inlet and/or the liquid outlet, the tail part (4) is used for being connected with the outer periphery of the axial outer side of the liquid inlet and/or the liquid outlet, the middle part (5) is connected with the head part (3) and the tail part (4) and is used for being installed in the liquid inlet and/or the liquid outlet,

at least one of the head part (3), the tail part (4) and the middle part (5) is used for forming sealing connection with the liquid inlet and/or the liquid outlet,

the head part (3) and the tail part (4) can limit the elastic plug (8) to move in the liquid inlet and/or the liquid outlet along the axial direction (A) of the liquid inlet and/or the liquid outlet.

2. The stopper assembly according to claim 1, wherein the head portion (3) forms an annular first sealing surface (1a) with an inner periphery of the liquid inlet and/or liquid outlet and the tail portion (4) forms an annular second sealing surface (1b) with an outer periphery of the liquid inlet and/or liquid outlet.

3. Plug assembly according to claim 2, wherein the tail (4) comprises:

a primary seal portion (41), the primary seal portion (41) having a radial dimension that gradually increases outwardly in the axial direction (A), the primary seal portion (41) being configured to form the second sealing surface (1b) with an outer peripheral edge of the liquid inlet and/or outlet; and

a secondary seal portion (42) that is connected to the primary seal portion (41) on the radially outer side of the primary seal portion (41), and that extends back and forth to the axially inner side with respect to the primary seal portion (41);

the secondary seal portion (42) and the primary seal portion (41) form a housing portion having a housing space (43) that opens to the axial inner side, the housing space (43) being configured to house a case protrusion (10) that encloses an axial outer portion of the liquid inlet and/or the liquid outlet, and the secondary seal portion (42) being configured to form an annular third seal surface (1c) with the case protrusion (10).

4. Plug assembly according to claim 3, wherein the portions of the tail (4) for forming the third sealing surface (1c) and the second sealing surface (1b) are radially spaced apart.

5. The plug assembly according to claim 2, wherein the portion of the head (3) intended to form with the inner peripheral edge a first sealing surface (1a) of annular shape is connected to the intermediate portion (5) and has a radial dimension that becomes progressively larger inwards in the axial direction (a).

6. Plug assembly according to claim 1, further comprising a magnet (6), the elastic plug (8) having a blind hole (50) open at the head (3) and extending in the axial direction (a), the magnet (6) being mounted compressively in the blind hole (50).

7. Plug assembly according to claim 1, wherein the tail (4) is formed with an operating portion (7) for operating the plug assembly by forming a protrusion or a recess or a hole.

8. A liquid storage tank, comprising: a box body (1); a liquid inlet and/or a liquid outlet formed on the box body (1); and a plug assembly for sealing the liquid inlet and/or the liquid outlet, wherein the plug assembly is according to any one of claims 1 to 7.

9. A tank according to claim 8 wherein the intermediate portion (5) has a non-uniform outer diameter and the inlet and/or outlet ports have a uniform inner diameter, thereby forming a deformation space for the resilient plug (8) between the outer circumferential surface of the intermediate portion (5) and the inner circumferential surface of the inlet and/or outlet ports.

10. A liquid storage tank, comprising: a box body (1); a liquid inlet and/or a liquid outlet formed on the box body (1); and a plug assembly sealing the liquid inlet and/or the liquid outlet,

the box body (1) is provided with a box body bulge (10) which encloses the axial outer part of the liquid inlet and/or the liquid outlet,

the plug assembly comprises an elastomeric plug (8) made of an elastomeric material, the elastomeric plug (8) comprising a head portion (3), a tail portion (4) and an intermediate portion (5), at least a portion of the head portion (3) having a radial dimension greater than the intermediate portion (5), the head portion (3) being adapted to form a first sealing surface (1a) with an axially inner peripheral edge of the liquid inlet and/or outlet, at least a portion of the tail portion (4) having a radial dimension greater than the intermediate portion (5), the tail portion (4) having:

a primary seal portion (41), the primary seal portion (41) having a radial dimension that becomes larger outward in the axial direction (A), the primary seal portion (41) forming a second seal surface (1b) with an inner peripheral surface of the case boss (10);

a secondary seal portion (42), the secondary seal portion (42) being connected to the primary seal portion (41) on a radially outer side of the primary seal portion (41) and extending toward the axially inner side,

the secondary seal portion (42) and the primary seal portion (41) form a housing portion having a housing space (43) that opens inward in the axial direction, the housing space (43) is configured to house the case boss (10), and the secondary seal portion (42) and the outer peripheral surface of the case boss (10) form a third seal surface (1 c).

Technical Field

The invention relates to the technical field of liquid storage, in particular to a plug assembly and a liquid storage tank.

Background

Figure 4 shows a prior art gearbox configuration near the oil discharge.

The gear box includes box 100, oiling stopper subassembly and oil drain stopper subassembly, and box 100 forms the oil storage chamber and has oiling mouth and oil drain, and oil storage chamber loads fluid 200, and the oiling mouth is sealed by the oiling stopper subassembly, and the oil drain is sealed by the oil drain stopper subassembly.

The drain plug assembly includes a drain plug 300, a sealing washer 400, and a magnet 500. The oil drain plug 300 is provided with external threads, and the oil drain is provided with internal threads, so that the oil drain plug 300 is screwed with the tank body 100. A sealing gasket 400 is located between the drain plug 300 and the tank 100, and the sealing gasket 400 is deformed to form a sealing surface between the tank 100 and the drain plug 300. The drain plug 300 has a recess opening toward the oil storage chamber, and the magnet 500 is mounted in the recess for attracting the iron pieces in the oil storage chamber.

This oil plug assembly has the following disadvantages:

firstly, the oil drain plug 300 needs to be disassembled and assembled by using a special tool, so that the operation is inconvenient;

secondly, in order to avoid oil leakage, the screwing torque needs to be accurately controlled, and the operation requirement is high;

thirdly, internal threads and external threads which are matched with each other need to be processed, and the process is complex;

fourthly, a professional anticorrosion process needs to be performed on the oil drain plug 300 and the sealing washer 400;

fifth, the sealing gasket 400 is more susceptible to electrochemical corrosion, resulting in oil leakage;

sixth, the magnet 500 may fall off the drain plug 300.

Therefore, the technical problem to be solved by those skilled in the art is how to more conveniently and effectively implement the oil storage, filling and discharging functions of the gearbox.

Disclosure of Invention

The present invention has been made in view of the state of the art described above. The invention aims to provide a plug assembly and a liquid storage tank, which can simplify the processing technology of the liquid storage tank, improve the operation convenience of liquid injection and/or liquid discharge and effectively prevent the liquid leakage phenomenon.

There is provided a plug assembly for sealing a liquid inlet and/or a liquid outlet of a tank, the plug assembly comprising a resilient plug of resilient material, the resilient plug comprising a head portion, a tail portion and an intermediate portion, at least a portion of the head portion having a radial dimension greater than the intermediate portion, at least a portion of the tail portion having a radial dimension greater than the intermediate portion,

the head part is used for being connected with the inner periphery of the axial inner side of the liquid inlet and/or the liquid outlet, the tail part is used for being connected with the outer periphery of the axial outer side of the liquid inlet and/or the liquid outlet, the middle part is connected with the head part and the tail part and is used for being installed in the liquid inlet and/or the liquid outlet,

at least one of the head part, the tail part and the middle part is used for forming sealing connection with the liquid inlet and/or the liquid outlet,

the head part and the tail part can limit the elastic plug to move along the axial direction of the liquid inlet and/or the liquid outlet in the liquid inlet and/or the liquid outlet.

In at least one embodiment, the head portion forms an annular first sealing surface with an inner periphery of the liquid inlet and/or liquid outlet and the tail portion forms an annular second sealing surface with an outer periphery of the liquid inlet and/or liquid outlet.

In at least one embodiment, the tail comprises:

a primary seal portion having a radial dimension that gradually increases outwardly in the axial direction, the primary seal portion being configured to form the second sealing surface with an outer peripheral edge of the liquid inlet and/or the liquid outlet; and

a secondary seal portion connected to the primary seal portion on a radially outer side of the primary seal portion and extending back toward the axially inner side with respect to the primary seal portion;

the secondary sealing portion and the primary sealing portion form a containing portion, the containing portion is provided with a containing space which is opened towards the axial inner side, the containing space is used for containing a box body bulge which encloses the axial outer side portion of the liquid inlet and/or the liquid outlet, and the secondary sealing portion is used for forming an annular third sealing surface with the box body bulge.

In at least one embodiment, the portions of the tail portion that form the third and second sealing faces are radially spaced apart.

In at least one embodiment, the primary seal portion includes a transition portion connected to the intermediate portion and having a radial dimension that increases progressively radially outward in the axial direction, and an extension portion located radially outward of the transition portion and connected between the transition portion and the secondary seal portion, the transition portion being configured to form the second seal face.

In at least one embodiment, the portion of the head portion for forming the annular first sealing surface with the inner peripheral edge is connected to the intermediate portion and has a radial dimension that gradually increases inwardly in the axial direction.

In at least one embodiment, the plug assembly further includes a magnet, the elastomeric plug having a blind bore open at the head and extending in the axial direction, the magnet being compressively mounted within the blind bore.

In at least one embodiment, the tail portion is formed with an operating portion for operating the plug assembly by forming a protrusion or a recess or a hole.

There is provided a liquid storage tank comprising: a box body; a liquid inlet and/or a liquid outlet formed on the box body; and a plug assembly sealing the liquid inlet and/or the liquid outlet, the plug assembly being as claimed in any one of claims 1 to 8.

In at least one embodiment, the intermediate portion has a non-uniform outer diameter, and the liquid inlet and/or the liquid outlet has a uniform inner diameter, thereby forming a deformation space of the elastic stopper between an outer circumferential surface of the intermediate portion and an inner circumferential surface of the liquid inlet and/or the liquid outlet.

There is provided a liquid storage tank comprising: a box body; a liquid inlet and/or a liquid outlet formed on the box body; and a plug assembly sealing the liquid inlet and/or the liquid outlet,

the box body is provided with a box body bulge which encloses the axial outer side part of the liquid inlet and/or the liquid outlet,

the plug assembly comprises an elastomeric plug made of an elastomeric material, the elastomeric plug comprising a head portion, a tail portion and an intermediate portion, at least a portion of the head portion having a radial dimension greater than the intermediate portion, the head portion being adapted to form a first sealing surface with an axially inner peripheral edge of the liquid inlet and/or outlet port, at least a portion of the tail portion having a radial dimension greater than the intermediate portion, the tail portion having:

a primary seal portion having a radial dimension that becomes larger outward in the axial direction, the primary seal portion forming a second seal surface with an inner peripheral surface of the case protrusion;

a secondary seal portion connected to the primary seal portion radially outward of the primary seal portion and extending toward the axially inward side,

the secondary seal portion and the primary seal portion form a housing portion having a housing space that opens toward the inside in the axial direction, the housing space being configured to house the case protrusion, and the secondary seal portion and a convex outer peripheral surface of the case form a third seal surface.

The technical scheme provided by the disclosure can at least obtain the following beneficial effects:

at least one of the head part, the tail part and the middle part is in sealing connection with the liquid outlet, and the head part and the tail part can limit the elastic plug to move axially in the liquid inlet and/or the liquid outlet, so that effective sealing of the liquid inlet and/or the liquid outlet and reliable relative fixing of the liquid inlet and the liquid outlet by the plug assembly can be realized.

Compared with the mode of realizing sealing by locking threads in the prior art, the plug assembly and the liquid storage tank are not easy to generate electrochemical corrosion phenomena, so that the sealing reliability is higher, the machining process is simpler and more convenient without machining threads, the process of plugging in and pulling out does not need to use a special tool, the operation space is saved, and the operation difficulty is lower without regulating and controlling the torque.

At least part of the technical scheme can also obtain the following beneficial effects:

the elastic plug has a double sealing function at the axial outer side of the liquid inlet and/or the liquid outlet by forming the second sealing surface and the third sealing surface, and also realizes sealing at the axial inner side of the liquid inlet and/or the liquid outlet by forming the first sealing surface, and the sealing assembly has reliable sealing effect due to the configuration of the plurality of sealing surfaces.

The first sealing surface is preferably formed as a substantially conical or substantially conical annulus with an arcuate axial cross-section, which enables a better sealing effect to be achieved.

The second sealing surface and the third sealing surface are spaced in the radial direction, and the scheme has better sealing effect.

The second sealing surface formed by the gradual change part is a truncated cone surface or a roughly truncated cone surface with an arc-shaped axial section, and the second sealing surface inclined relative to the axial direction has better sealing effect.

The operating portion can be pulled so that the elastic plug can be easily removed.

When the elastic plug is plugged into the liquid inlet and/or the liquid outlet, a deformation space can be reserved between the outer peripheral surface of the middle part and the inner peripheral surface of the liquid inlet and/or the liquid outlet, and a sealing surface is formed on the head part and the tail part, so that a desired sealing effect is obtained.

Drawings

Fig. 1 is a cross-sectional view of one embodiment of a reservoir provided by the present disclosure, showing a plug assembly mounted to a housing of a gear box as an example of the reservoir.

FIG. 2 is an enlarged view of the plug assembly of FIG. 1 near the drain.

Fig. 3 is an enlarged view of the plug assembly of fig. 1.

FIG. 4 is a schematic view of a prior art oil plug assembly showing the assembly of the oil plug assembly to a gearbox.

Description of reference numerals:

1, 10 box bulges, 2 oil, 3 heads, 4 tails, 41 primary sealing parts, 411 gradual change parts, 412 extension parts, 42 secondary sealing parts, 43 receiving parts, 5 middle parts, 50 blind holes, 6 magnets, 1a first sealing surface, 1b second sealing surface, 1c third sealing surface, 7 operating parts and 8 elastic plugs;

axial direction A and radial direction R;

100 boxes, 200 oil, 300 oil drain plugs, 400 sealing gaskets and 500 magnets.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is intended only to teach one skilled in the art how to practice the invention, and is not intended to be exhaustive or to limit the scope of the invention.

As shown in fig. 1 to 3, the present disclosure provides a reservoir and a plug assembly, the reservoir including a tank body 1, a liquid discharge port, and the plug assembly. A liquid storage space is formed in the box body 1, the liquid outlet is communicated with the liquid storage space, and the plug assembly seals the liquid outlet.

It should be understood that the tank 1 may also be formed with a liquid inlet for injecting liquid into the tank 1, or the liquid may be injected into the tank and discharged from the tank 1 through the same opening, i.e. the liquid inlet and the liquid outlet are the same opening formed in the tank 1. By way of example and not limitation, the reservoir may be a gearbox for a vehicle, in particular a gearbox.

It will be appreciated that, since the casing 1 has a certain wall thickness, the discharge port has an axial dimension (length) which is approximately the wall thickness of the wall of the casing 1 forming the discharge port, i.e. the axially inner side of the discharge port (the side close to the liquid storage space) is spaced from the axially outer side of the discharge port, which forms the passage for the oil 2 to flow through.

It is defined here that the "axial direction a" of the liquid discharge port is a direction from the inside (the side close to the liquid storage space) of the liquid discharge port to the outside (the outside) of the liquid discharge port, or a direction from the outside of the liquid discharge port to the inside of the liquid discharge port, and the "radial direction R" of the liquid discharge port is a direction perpendicular to the "axial direction a".

The plug assembly comprises an elastomeric plug 8, the elastomeric plug 8 having a head portion 3, a tail portion 4 and an intermediate portion 5, the head portion 3 for connection with an axially inner peripheral edge of the discharge port, the tail portion 4 for connection with an axially outer peripheral edge of the discharge port, the intermediate portion 5 connecting the head portion 3 and the tail portion 4. In the process of plugging the elastic plug 8 into the drain port, the head portion 3 enters the drain port first, the intermediate portion 5 enters later, the tail portion 4 stays at the axially outer side portion of the drain port, and the intermediate portion 5 fills the path through which the oil supply liquid 2 of the drain port flows.

By definition, the "axial direction a" of the elastic plug 8 is a direction directed from the head portion 3 toward the tail portion 4 or a direction directed from the tail portion 4 toward the head portion 3, the axial direction a of the elastic plug 8 is the same as the axial direction a of the discharge port when the plug assembly is mounted to the discharge port, and the "radial direction R" of the elastic plug 8 is a direction perpendicular to the "axial direction a".

It should be understood that the above-described "inner peripheral edge" and "outer peripheral edge" include portions near the axially inner side or the axially outer side of the inner peripheral surface and/or the inner peripheral surface of the liquid discharge port.

Head 3

At least a part of the head portion 3 of the elastic plug 8 has a radial dimension larger than that of the intermediate portion 5, and a first seal surface 1a is formed between the head portion 3 and the inner circumferential edge of the discharge port on the inner side in the axial direction.

As shown in fig. 2 and 3, at least a portion of the head portion 3 of the elastic plug 8 may have a radial dimension that gradually increases inward in the axial direction a, for example, the head portion may have a mushroom-head shape that gradually expands from a root portion to an end portion (the end portion is located axially outward of the root portion, and the root portion is connected to the intermediate portion 5).

The inner peripheral edge on the axially inner side of the liquid discharge port may be formed as a slope inclined with respect to the axial direction a thereof, more specifically, as a substantially conical ring surface having a conical shape or an arc-shaped cross section, the slope being inclined radially outward in the course of being directed inward in the axial direction a, the slope matching a portion of the head 3 whose radial dimension becomes gradually larger inward in the axial direction a.

Thus, the first sealing surface 1a is annular (frustoconical surface), and such a first sealing surface 1a inclined with respect to the axial direction a has a better sealing effect.

In other embodiments, for example, the head 3 may have an abrupt radial dimension with respect to the intermediate portion 5 and contact the inner wall of the tank 1, so as to form an annular first sealing surface 1a extending in the radial direction R.

Tail 4

At least a part of the tail portion 4 of the elastic plug 8 has a radial dimension larger than that of the intermediate portion 5, and a second sealing surface 1b is formed between the tail portion 4 and an outer peripheral edge of the discharge port on the outer side in the axial direction.

The tail portion 4 includes a primary seal portion 41 and a secondary seal portion 42, the primary seal portion 41 being located radially inward of the secondary seal portion 42, the primary seal portion 41 being connected to the intermediate portion 5, and the secondary seal portion 42 being connected to the primary seal portion 41. The primary seal portion 41 has a radial dimension that becomes larger outward in the axial direction a, and the secondary seal portion 42 extends back toward the axial inner side of the elastic plug 8 with respect to the primary seal portion 41, for example, extends in the axial direction a of the elastic plug 8.

The primary seal portion 41 and the secondary seal portion 42 form a housing portion having a housing space that opens toward the inside in the axial direction, and the housing space may be open in the axial direction a, for example. The housing space is for housing a case boss 10 enclosing an axial outer portion of the liquid discharge port, and the case boss 10 has an inner peripheral surface and an outer peripheral surface. The secondary seal portion 42 forms a third seal surface 1c with the outer peripheral surface of the case boss 10, and the primary seal portion 41 forms a second seal surface 1b with the outer peripheral edge of the drain port on the outer side in the axial direction (including the inner peripheral surface of the case boss 10).

When the elastic plug 8 is plugged into the drain port, the end of the secondary seal portion 42 can reach a position substantially flush with the root of the case boss 10, while the case boss 10 is received in the receiving space 43.

Contact surfaces having a substantially U-shaped cross-sectional shape (shape in cross section taken along the axial direction a) are formed between the primary seal portion 41 and the secondary seal portion 42 and the case boss 10, the third seal surface 1c may be located on the outer peripheral surface of the case boss 10, and the second seal surface 1b may be located on the inner peripheral surface of the case boss 10.

The elastic plug 8 has a double sealing function on the axially outer side of the discharge port by forming the second sealing surface 1b and the third sealing surface 1c, and also performs sealing on the axially inner side of the discharge port by forming the first sealing surface 1a, and the configuration of the plurality of sealing surfaces provides a reliable sealing effect for the seal assembly.

The primary seal portion 41 may include a gradually varying portion 411 and an extending portion 412, the gradually varying portion 411 being connected to the intermediate portion 5 and having a radial dimension gradually increasing outward in the axial direction a of the elastic plug 8, the extending portion 412 being connected between the gradually varying portion 411 and the secondary seal portion 42.

An inclined surface inclined with respect to the axial direction a of the discharge port, more specifically, a substantially conical ring surface having a conical shape or an arc-shaped cross section, which is inclined radially outward in a process of being directed outward in the axial direction a, may be formed on the outer peripheral edge of the axially outer side of the discharge port, the inclined surface being matched with the gradually varying portion 411.

In one example, the second sealing surface 1b is formed by the transition 411, i.e. the second sealing surface 1b is located between the ramp and the transition 411, while the third sealing surface 1c is formed by the secondary sealing portion 42. Meanwhile, the end surface of the box bulge 10 is in contact with or clearance fit with the extension part 412, and the second sealing surface 1b and the third sealing surface 1c are spaced in the radial direction, so that the scheme has better sealing effect.

In other embodiments, the second sealing surface 1b may also be formed by both the inner peripheral surface of the liquid discharge port and the end surface of the case protrusion 10, i.e., both the gradual change portion 411 and the extension portion 412 are used to form the second sealing surface 1 b.

The second sealing surface 1b formed by the gradual change portion 411 is a truncated cone surface, and the second sealing surface 1b inclined relative to the axial direction a has a better sealing effect.

In other embodiments, the secondary seal 42 may extend obliquely with respect to the axial direction a of the elastomeric plug 8.

The tail portion 4 may also be formed with an operating portion 7 for operating the plug assembly by forming a projection or recess or hole. For example, in the process of vulcanization forming the elastic plug 8, the operation portion 7 is collectively formed using a mold having a predetermined shape.

The operating portion 7 can be pulled so that the elastic plug 8 can be easily removed.

Intermediate section 5

A deformation space of the elastic stopper 8 may be formed between the outer peripheral surface of the intermediate portion 5 and the inner peripheral surface of the liquid discharge port, for example, the intermediate portion 5 has a nonuniform outer diameter, for example, the intermediate portion 5 has a radial dimension that gradually increases outward in the axial direction a of the elastic stopper 8, and the liquid discharge port has a uniform inner diameter. When the elastic plug 8 is plugged into the liquid discharge port, a deformation space is reserved between the outer peripheral surface of the middle portion 5 and the inner peripheral surface of the liquid discharge port, and the head portion 3 and the tail portion 4 are facilitated to form a sealing surface, so that a desired sealing effect is obtained.

The elastic plug 8 has a blind hole 50 open in the head 3 and extending in the axial direction a both in the intermediate portion 5 and in the head 3, this blind hole 50 being used for mounting the magnet 6, the magnet 6 being pressed in the blind hole 50 so as to be firmly mounted. The magnet 6 may be used to attract iron filings in the oil 2.

The magnet 6 is elastically deformed and wrapped by the elastic plug 8, and the magnet 6 is not easily dropped.

The elastic plug 8 has a portion having a larger radial dimension than the intermediate portion 5 at the head portion 3 and the tail portion 4, respectively, so that the head portion 3 returns to its original shape after passing through the passage of the discharge port to the inside of the discharge port and is caught in the axial direction a in the inside of the discharge port, while the tail portion 4 is caught in the axial direction a in the outside of the discharge port.

The head 3 and the tail 4 not only limit the movement of the elastomeric plug 8 in the discharge opening in the axial direction a of the discharge opening, but also form a reliable first sealing surface 1a and a reliable second sealing surface 1b, which enable an effective sealing of the plug assembly and a reliable relative fixation to the discharge opening.

In other embodiments, the sealing surface may be provided in the middle portion of the liquid discharge port.

As long as at least one of the head portion 3, the tail portion 4 and the intermediate portion 5 is used for forming a sealing connection with the drain opening, and the head portion 3 and the tail portion 4 can limit the movement of the elastic plug 8 in the drain opening along the axial direction a of the drain opening, effective sealing and reliable relative fixation of the plug assembly with the drain opening can be achieved.

Compared with the mode of realizing sealing through locking threads in the prior art, the plug assembly and the liquid storage tank provided by the disclosure have the advantages that the reliability of sealing is higher without electrochemical corrosion, the machining process is simpler and more convenient without machining threads, the process of plugging and pulling out does not need to use a special tool, the operation space is saved, and the operation difficulty is lower without regulating and controlling the torque.

The elastic plug 8 may be made of elastic material such as rubber, plastic, etc.

The plug assembly provided by the disclosure can be used for a gear box of an electric axle, can also be used for other liquid storage tanks in a vehicle, and can also be used for other industrial liquid storage tanks. The liquid inlet and/or the liquid outlet of the liquid storage tank can be/is a light hole, even if the plug assembly can obtain a good sealing effect.

It should be understood that the above embodiments are only exemplary and are not intended to limit the present invention. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of the present invention without departing from the scope thereof.