Cap assembly, liquid reservoir, and vehicle

Abstract

The present application relates to a cap assembly, a liquid storage tank and a vehicle. The cap assembly comprises a housing having a cap portion, a tubular elongated portion and a top portion enclosing an end of the elongated portion distal to the cap portion. The elongated portion has a vent hole at a position adjacent to the top portion, such that when the cap portion is connected to a spout of a filler pipe of the liquid storage tank, an inner cavity of the liquid storage tank is in communication with the external environment via the vent hole. The height of the vent hole of the cap assembly is elevated by means of the elongated portion, such that the risk of water entering the liquid storage tank via the vent hole of the cap assembly is effectively reduced when the vehicle is wading.

Description

Technical Field

[0001] This application relates to the technical field of liquid storage tanks, and more specifically to a cover assembly for a liquid storage tank, a liquid storage tank, and a vehicle having said liquid storage tank. Background Technology

[0002] The vehicle braking system is a core system in a vehicle designed to ensure driving safety, providing sufficient braking force when braking is required. In hydraulic braking systems, brake fluid is typically used as the hydraulic medium to generate and maintain this braking force. The required braking force is generated by supplying brake fluid to the master cylinder and / or plunger chambers, and then distributing it from the master cylinder and / or plunger chambers to the corresponding brake circuits. Brake fluid is usually stored in a reservoir.

[0003] The reservoir is not a completely sealed system. The fluid level inside the reservoir can vary under different conditions. A completely sealed reservoir would cause serious problems. To maintain a near-equilibrium pressure between the internal pressure of the reservoir and atmospheric pressure to ensure proper functioning of the vehicle's braking system, the reservoir cap assembly is typically designed with a venting path. However, when a vehicle is wading through water, this venting path can allow water from the external environment to backflow into the reservoir and mix with the brake fluid, contaminating it. This contamination alters the brake fluid's properties and affects the reliability of the braking system.

[0004] Therefore, necessary measures must be taken to prevent water from the external environment from flowing back into the storage tank through the ventilation path. For example, Chinese utility model patent CN220764361U discloses a cover assembly and a storage tank. The cover assembly includes a cover body and a diaphragm disposed within the cover body, with air holes provided on the diaphragm. The cover assembly also includes a cap fitted onto the cover body, with a through hole on the cover body. A portion of the cap is movably disposed within the through hole. When the cover assembly is submerged in water, the cap stops at the through hole and completely seals it. However, while such a cover assembly can prevent water from the external environment from flowing back into the storage tank through the ventilation path, its structure is relatively complex. Utility Model Content

[0005] The purpose of this application is to solve or at least alleviate some of the problems existing in the prior art.

[0006] A first aspect of this application is to provide a cap assembly for sealing the opening of a liquid filling pipe of a liquid reservoir in a ventilable manner. Here, the cap assembly includes a housing having: a cap portion including a top wall and an annular side wall extending axially from the top wall and capable of being liquid-sealed and detachably connected to the opening of the liquid filling pipe of the liquid reservoir; a tubular extension extending from the top wall of the cap portion in a direction opposite to the side wall of the cap portion; and a top closing the end of the extension away from the cap portion, wherein the extension has a vent near the top, so that when the cap portion is connected to the opening of the liquid filling pipe of the liquid reservoir, the interior of the liquid reservoir communicates with the external environment via the vent. The extension raises the height of the vent of the cap assembly, effectively reducing the risk of water entering the liquid reservoir through the vent when the vehicle is wading through water. With the reservoir installed in the vehicle, the vent of the cover assembly is raised above a predetermined wading line of the vehicle, particularly by means of the extended portion. Therefore, as long as the vehicle does not exceed the predetermined wading line, water will not enter the reservoir through the vent.

[0007] Optionally, the cover assembly includes an insert having a water storage cavity open toward the top of the housing. The insert is insertable from the cap portion of the housing and held in an extension portion of the housing, wherein a gap forming a ventilation path exists between the extension portion and the insert. By inserting the insert with the water storage cavity into the housing of the cover assembly, even if a small amount of water leaks into the cover assembly through the vent, it will be temporarily stored in the water storage cavity and will not further enter the reservoir, thereby further reducing the risk of water leaking into the reservoir and contaminating the brake fluid in the reservoir.

[0008] Optionally, the insert has a plurality of elastic legs extending from the bottom of the water storage cavity away from the top of the outer casing. The free ends of the elastic legs are provided with hooks that can engage with slots provided on the inner wall of the extended portion of the outer casing. This simplifies the installation of the insert; simply inserting the insert from the cap portion into the extended portion of the outer casing causes the elastic legs to be elastically compressed radially by the wall of the extended portion. Once the hooks of the elastic legs engage with the slots on the inner wall of the extended portion, the elastic legs return to their initial shape, thereby retaining the insert within the extended portion along its axial direction. Alternatively, the outer surface of the insert may be provided with external threads that can engage with corresponding internal threads on the inner wall of the extended portion of the outer casing. This allows the insert to be easily retained within the outer casing by screwing it into the extended portion. Alternatively, the insert can also be fixed to the inner wall of the extended portion of the outer casing by welding or bonding. This secures the insert within the housing in a non-removable manner. This method also simplifies the manufacturing of both the housing and the insert.

[0009] Optionally, the insert has a return pipe extending from the bottom of the reservoir away from the top of the housing, the return pipe opening towards the cap portion of the housing. Thus, even if some brake fluid splashes from the reservoir into the cap assembly due to vehicle movement, it is blocked in the return pipe and flows back into the reservoir, effectively preventing brake fluid leakage from the reservoir into the external environment.

[0010] Optionally, the cover assembly further includes a seal installed within the cap portion of the housing, wherein the seal has a first sealing surface facing the top wall of the cap portion and a second sealing surface facing away from the top wall of the cap portion in a radially outer region. When the cap portion is connected to the inlet of the reservoir's injection pipe, the first sealing surface tightly abuts against the top wall of the cap portion, and the second sealing surface tightly abuts against the end face of the inlet of the reservoir's injection pipe. By providing the seal, on the one hand, leakage of brake fluid from the reservoir into the external environment at the connection between the cap portion and the inlet of the reservoir's injection pipe can be effectively prevented; on the other hand, the amount of brake fluid splashed from the reservoir into the cover assembly can be effectively reduced, and the risk of brake fluid splashed into the cover assembly leaking into the external environment through the vent hole can be further reduced.

[0011] Optionally, the central region of the seal is further away from the top wall of the cap than the radially outer region of the seal, thus forming a cup-shaped buffer cavity. The return pipe extends into the buffer cavity, and a vent is formed in the central region of the seal. By providing the buffer cavity, a small amount of brake fluid splashed into the cap assembly via the vent can collect in the buffer cavity and return to the reservoir via the vent. Through this arrangement of the seal and the return pipe, almost no brake fluid reaches the area outside the return pipe; however, gas exchange between the reservoir and the external environment can be reliably achieved via the vent, thereby achieving pressure balance between the inside of the reservoir and the external environment.

[0012] Optionally, the outer casing has a gas-liquid exchange pipe extending from the top toward the cap portion into the water storage cavity of the insert and opening toward the water storage cavity. A vent hole leads into the gas-liquid exchange pipe, and a gap forms a ventilation path between the wall of the water storage cavity and the gas-liquid exchange pipe. Through this arrangement of the gas-liquid exchange pipe and the water storage cavity, a small amount of water entering the cap assembly via the vent hole can reliably reach and be stored in the water storage cavity without reaching the outside of the water storage cavity and thus leaking into the liquid storage tank.

[0013] Optionally, the gas-liquid exchange pipe extends into the water storage chamber to a depth of at least half the depth of the water storage chamber. This ensures that water entering the cover assembly via the vent can reliably reach and be stored in the water storage chamber, while also minimizing the risk of water falling into the water storage chamber splashing outside and leaking into the liquid storage tank. The deeper the gas-liquid exchange pipe extends into the water storage chamber, the better this effect.

[0014] Optionally, the diameter of the vent hole is 0.5 mm to 2 mm. When the cover assembly closes the inlet of the reservoir's filling pipe, a sealed space is effectively formed inside the reservoir and the cover assembly, except for the vent hole. When the vehicle is wading through water, the brake booster typically does not engage, thus maintaining a relatively stable internal pressure within the reservoir and the cover assembly. In this case, provided the diameter of the vent hole is small enough, even if the cover assembly is submerged in water, the internal pressure of the reservoir and the cover assembly will prevent water from entering the cover assembly through the vent hole.

[0015] A second aspect of this application is to provide a reservoir for use in a vehicle's braking system and including a filler hose. The reservoir also includes the aforementioned cap assembly, which ventilates and seals the opening of the filler hose.

[0016] A third aspect of this application is to provide a vehicle having the aforementioned reservoir for storing brake fluid, wherein a vent hole of the reservoir's cap assembly is located above a predetermined wading line of the vehicle. Attached Figure Description

[0017] The embodiments of this application will be described in further detail below with reference to the accompanying drawings. However, those skilled in the art will understand that these drawings are for illustrative purposes only and should not be construed as limiting the scope of this application. The accompanying drawings show: Figure 1 This is a perspective view of a cover assembly according to one embodiment of this application; Figure 2 This is a perspective view of the housing of a cover assembly according to one embodiment of this application; Figure 3 This is a perspective view of the insert of a cover assembly according to one embodiment of this application; Figure 4 This is a perspective view of the seal of a cover assembly according to one embodiment of this application; Figure 5 This is a cross-sectional view of a cover assembly according to one embodiment of this application; Figure 6 This is another cross-sectional view of the cover assembly according to one embodiment of this application; Figure 7 This is another cross-sectional view of the cover assembly according to one embodiment of this application; and Figure 8 This is a simplified schematic diagram of a vehicle with a liquid storage tank according to one embodiment of this application. Detailed Implementation

[0018] Figure 1 A perspective view shows a cover assembly 10 according to one embodiment of this application. The cover assembly 10 is used to seal the inlet of the injection pipe 61 of the storage tank 60 in a ventilated manner (in... Figure 8 (Illustrated schematically). From Figure 1 As can be seen, the cap assembly 10 includes a housing 40, the housing 40 having a cap portion 41, the cap portion 41 including a top wall and an annular side wall extending from the top wall along the axial direction of the cap portion 41, and capable of being liquid-sealed and detachably connected to the inlet of the liquid injection pipe 61 of the liquid storage tank 60, thereby sealing the inlet of the liquid injection pipe 61 of the liquid storage tank 60. To detachably connect the cap portion 41 to the inlet of the liquid injection pipe 61 of the liquid storage tank 60, in Figure 1The illustrated embodiment demonstratively shows an internal thread formed on the inner surface of the sidewall of the cap portion 41. For this purpose, the inlet of the injection pipe 61 of the reservoir 60 can be provided with a corresponding external thread (not shown), thereby allowing the cap portion 41 to be tightened onto the inlet of the injection pipe 61 of the reservoir 60. However, instead of a threaded connection, a snap-fit ​​connection structure or any other connection structure known in the prior art can be provided for the cap portion 41 and the inlet of the injection pipe 61, as long as the detachable connection can be achieved.

[0019] Furthermore, the outer casing 40 also has a tubular elongation 42. From Figure 1 As can be seen, the extended portion 42 extends from the top wall of the cap portion 41 in a direction opposite to the side wall of the cap portion 41. At the end of the extended portion 42 away from the cap portion 41, the outer casing 40 also has a top 43, which closes the end of the extended portion 42 away from the cap portion 41. To facilitate ventilation between the liquid storage tank 60 and the external environment, the extended portion 42 has a vent 44 near the top 43, so that when the cap portion 41 is connected to the inlet of the liquid filling pipe 61 of the liquid storage tank 60, the inner cavity of the liquid storage tank 60 communicates with the external environment via the vent 44. The closer the vent 44 is to the top 43, the more fully the extended portion 42 is utilized.

[0020] In addition, from Figure 1 It can also be seen that the outer casing 40 is further fitted with a sealing element 20 within the cap portion 41, and a vent 21 is formed in the central region of the sealing element 20. Here, the vent 21 can be designed, for example, as a slit-shaped cut. Ventilation between the liquid storage tank 60 and the external environment can be achieved through the vent 21. The specific structure of the sealing element 20 will be described in detail below.

[0021] exist Figure 1 In the illustrated embodiment, the radial dimension of the top 43 of the outer casing 40 is larger than the radial dimension of the extended portion 42, thereby the top 43 extends radially beyond the extended portion 42. To increase the strength of the cover assembly 10, a plurality of external reinforcing ribs 45 may be provided between the top 43 and the extended portion 42. Especially in Figure 1 In the illustrated embodiment, two reinforcing ribs 45 are provided on each side of the vent 44. It should be noted that the number and arrangement of the reinforcing ribs 45 are not limited to... Figure 1The embodiments shown are illustrated. In some embodiments, no reinforcing ribs may be provided without departing from the scope of protection of this application. In some embodiments, the radial dimension of the top 43 may not be greater than the radial dimension of the extended portion 42, that is, the top 43 may not extend beyond the extended portion 42 in the radial direction.

[0022] Figure 2 , Figure 3 and Figure 4 The housing 40, insert 30 and seal 20 of the cover assembly 10 according to one embodiment of this application are shown respectively. Figure 2 The structure of the outer casing 40 shown has been incorporated above. Figure 1 A detailed explanation has been provided, so it will not be repeated here. For example... Figure 3 As shown, the insert 30 can be inserted into and held in the extended portion 42 of the housing 40 from the cap portion 41 of the housing 40. The insert 30 has a water storage cavity 33 that opens toward the top 43 of the housing 40. In order to hold the insert 30 in the extended portion 42 of the housing 40, the insert 30 has a plurality of elastic legs 31 extending from the bottom of the water storage cavity 33 away from the top 43 of the housing 40. The free ends of the elastic legs 31 are provided with hooks 32, which can engage with slots 47 provided on the inner wall of the extended portion 42 of the housing 40 (see See). Figure 2 and Figure 5 In ), the card slot 47 described herein is as follows: Figure 2 The groove shown can be an annular groove, in which case the insert 30 can be installed into the housing 40 at any relative angular position relative to the housing 40. This simplifies the installation of the insert 30; simply insert the insert 30 from the cap portion 41 into the extended portion 42 of the housing 40. The elastic leg 31 is elastically compressed radially by the wall of the extended portion 42. Once the hook 32 of the elastic leg 31 engages in the groove 47 on the inner wall of the extended portion 42, the elastic leg 31 returns to its initial shape, thereby holding the insert 30 in the extended portion 42 along its axial direction. However, instead of the annular groove design, multiple dispersed grooves 47 can be provided circumferentially, each capable of engaging at least one hook 32 of the elastic leg 31. Here, the number of grooves 47 can be the same as the number of elastic legs 31. However, in some embodiments, the number of slots 47 can be greater than the number of elastic legs 31. In other embodiments, the number of slots 47 can be less than the number of elastic legs 31, in which case multiple hooks 32 can be engaged in each slot 47. Figure 3In the embodiment shown, four elastic legs 31 are evenly distributed along the circumferential direction. Figure 3 The three elastic legs 31 are clearly visible. However, this is merely exemplary, and different numbers of elastic legs 31 can be provided for the insert 30. In some embodiments not shown, the outer surface of the insert 30 may be provided with external threads that can engage with corresponding internal threads on the inner wall of the extension 42 of the housing 40. This allows the insert 30 to be easily retained in the housing 40 by screwing it into the extension 42. In other embodiments not shown, the insert 30 can be fixed to the inner wall of the extension 42 of the housing 40 by welding or bonding. This non-removably fixes the insert 30 in the housing 40. This also simplifies the manufacturing of the housing 40 and the insert 30.

[0023] Furthermore, radially inside the elastic leg 31, the insert 30 has a return pipe 34 extending from the bottom of the water storage cavity 33 away from the top 43 of the outer casing 40, the return pipe 34 opening toward the cap portion 41 of the outer casing 40. Figure 3 In the illustrated embodiment, the return pipe 34 has several notches 35 at its free end. Through these notches 35, even when the free end of the return pipe 34 is against the seal 20 in the installed state, air can flow into or out of the return pipe 34, thereby achieving ventilation between the liquid storage tank 60 and the external environment. However, it should be noted that such notches 35 are not essential. As long as the length of the return pipe 34 is appropriately designed so that it remains spaced from the seal 20 in the installed state, ventilation between the liquid storage tank 60 and the external environment can still be achieved.

[0024] Figure 5 A cross-sectional view shows a cover assembly 10 according to one embodiment of this application. The following is in conjunction with… Figure 5 The internal structure of the cover assembly 10 in the installed state will be described in more detail. It can be seen that the insert 30 has been inserted from the cap portion 41 of the housing 40 and is held in the extended portion 42 of the housing 40. Here, the hooks 32 of the elastic legs 31 of the insert 30 have engaged with the grooves 47 on the inner wall of the extended portion 42, thereby holding the insert 30 in the extended portion 42 along the axial direction of the extended portion 42 without it falling out. In the installed state, a gap exists between the extended portion 42 and the insert 30, forming a ventilation path.

[0025] The water storage chamber 33 of the insert 30 opens towards the top 43 of the outer casing 40. Water entering the cover assembly 10 via the vent 44 can thus collect in the water storage chamber 33. Furthermore, water can... Figure 5 As can be clearly seen, the insert 30 has a return pipe 34 extending from the bottom of the water storage chamber 33 away from the top 43 of the housing 40, the return pipe 34 opening toward the cap portion 41 of the housing 40. The return pipe 34 extends toward the seal 20 mounted within the cap portion 41 of the housing 40, and may extend up to the point where the free end of the return pipe 34 rests against the seal 20. However, the free end of the return pipe 34 may also be spaced apart from the seal 20.

[0026] from Figure 5 As can be clearly seen, the seal 20 has a first sealing surface facing the top wall of the cap portion 41 and a second sealing surface facing away from the top wall of the cap portion 41 in the radially outer region. When the cap portion 41 is connected to the inlet of the injection pipe 61 of the reservoir 60, the first sealing surface is tightly abutted against the top wall of the cap portion 41, and the second sealing surface is tightly abutted against the end face of the inlet of the injection pipe 61 of the reservoir 60. By providing the seal 20, on the one hand, it can effectively prevent the brake fluid in the reservoir 60 from leaking into the external environment at the connection between the cap portion 41 and the inlet of the injection pipe 61 of the reservoir 60; on the other hand, it can effectively reduce the amount of brake fluid splashed from the reservoir 60 into the cover assembly 10, and further reduce the risk of brake fluid splashed into the cover assembly 10 leaking into the external environment through the vent 44.

[0027] from Figure 5 As can be further seen, the central region of the seal 20 is further away from the top wall of the cap 41 than the radially outer region of the seal 20, thus forming a cup-shaped buffer cavity. The return pipe 34 extends into the buffer cavity, and a vent 21 is formed in the central region of the seal 20. By providing the buffer cavity, a small amount of brake fluid splashed into the cap assembly 10 via the vent 21 can converge into the buffer cavity and return to the reservoir 60 via the vent 21. Through this arrangement of the seal 20 and the return pipe 34, almost no brake fluid can reach the area outside the return pipe 34; however, gas exchange between the reservoir 60 and the external environment can be reliably achieved via the vent 21, thereby achieving pressure balance between the inside of the reservoir 60 and the external environment.

[0028] The outer casing 40 has a gas-liquid exchange pipe 46 extending from the top 43 toward the cap portion 41 into a water storage cavity 33 of the insert 30 and opening toward the water storage cavity 33. A vent 44 leads into the gas-liquid exchange pipe 46, and a gap forming a ventilation path exists between the wall of the water storage cavity 33 and the gas-liquid exchange pipe 46. Through this arrangement of the gas-liquid exchange pipe 46 and the water storage cavity 33, a small amount of water entering the cap assembly 10 via the vent 44 can reliably reach and be stored in the water storage cavity 33 (see [link to relevant documentation]). Figure 5 (As shown by the dashed line), the water will not reach the outside of the water storage chamber 33 and thus leak into the reservoir 60. The volume of the water storage chamber 33 can be designed according to the parameters of the vehicle's braking system, so that even when the brake booster is operated while the vehicle is floating in water, the volume of water drawn into the cover assembly 10 does not exceed the volume of the water storage chamber 33. Therefore, water in the water storage chamber 33 will not overflow from the water storage chamber 33 and reach the reservoir 60.

[0029] exist Figure 5 In the illustrated embodiment, to reinforce the gas-liquid exchange pipe 46, a plurality of internal reinforcing ribs are provided between the outer wall of the gas-liquid exchange pipe 46, the inner wall of the extended portion 42, and the inner wall of the top 43. Figure 5 In the illustrated embodiment, the inner reinforcing rib and the outer reinforcing rib 45 may be aligned radially. However, in some embodiments, the inner reinforcing rib may be offset from the outer reinforcing rib 45. It should be noted, however, that the inner reinforcing rib is not mandatory. In other embodiments, the inner reinforcing rib may be omitted.

[0030] from Figure 5 As can be seen, the gas-liquid exchange pipe 46 extends into the water storage cavity 33 to a depth exceeding half the depth of the water storage cavity 33. In some embodiments, the gas-liquid exchange pipe 46 may extend further towards the bottom of the water storage cavity 33. This ensures, on the one hand, that water entering the cover assembly 10 via the vent 44 can reliably reach and be stored in the water storage cavity 33, and on the other hand, it minimizes the risk of water falling into the water storage cavity 33 splashing outside the water storage cavity 33 and subsequently leaking into the liquid storage tank 60. The deeper the gas-liquid exchange pipe 46 extends into the water storage cavity 33, the better this effect.

[0031] When the cover assembly 10 closes the inlet of the injection pipe 61 of the reservoir 60, a sealed space is effectively formed inside the reservoir 60 and the cover assembly 10, except for the vent 44. When the vehicle is wading through water, the brake booster typically does not operate, thus the internal pressure of the reservoir 60 and the cover assembly 10 remains relatively stable. At this time, as long as the vent 44 is small enough, even if the cover assembly 10 is submerged in water, the internal pressure of the reservoir 60 and the cover assembly 10 can prevent water from entering the cover assembly 10 through the vent 44. Therefore, in some embodiments, the diameter of the vent 44 is 0.5 mm to 2 mm.

[0032] Figure 6 A cross-sectional view shows a cover assembly 10 according to one embodiment of this application. Figure 6 and Figure 5 While essentially the same, it can be seen that the water level in the water reservoir 33 has risen to the point that the lower end of the gas-liquid exchange pipe 46 is submerged in water. At this time, when the brake booster is working, a small portion of the brake fluid in the reservoir 60 is replenished to the master cylinder and / or plunger chamber, resulting in a decrease in pressure within the reservoir 60. Air from the external environment can still be drawn into the gas-liquid exchange pipe 46 through the vent 44. After passing through the water in the water reservoir 33, the air enters the reservoir 60 through the gap between the water reservoir 33 and the gas-liquid exchange pipe 46, the gap between the extension 42 and the water reservoir 33, and the vent 21 of the seal 20, thereby balancing the pressure between the reservoir 60 and the external environment. The airflow path in the cover assembly 10 is shown by the dashed lines.

[0033] Figure 7 A cross-sectional view shows a cover assembly 10 according to one embodiment of this application. Figure 7 and Figure 6 The process is essentially the same; however, at this point, the brake fluid in the master cylinder and / or plunger chamber returns to the reservoir 60. Since some air had already been drawn into the reservoir 60 beforehand, the backflow of brake fluid causes an increase in pressure within the reservoir 60. At this time, the air in the reservoir 60 will flow along the... Figure 6The air flows in the opposite direction. That is, air is discharged from the liquid storage tank 60 through the vent 21 of the seal 20, the gap between the extension 42 and the water storage chamber 33, the gap between the water storage chamber 33 and the gas-liquid exchange pipe 46, and the vent 44 to the external environment. However, since the gas-liquid exchange pipe 46 is immersed in the water in the water storage chamber 33, under the internal pressure of the liquid storage tank 60, the water in the water storage chamber 33 is forced out by the air in the liquid storage tank 60 towards the vent 44 (the gas-liquid exchange pipe 46 is shown to be completely filled in the figure), and is ejected through the vent 44, as shown by the dotted line in the figure. This causes the water level in the water storage chamber 33 to drop. This also ensures that the water in the water storage chamber 33 does not overflow and enter the liquid storage tank 60.

[0034] Figure 8 A vehicle having a liquid storage tank 60 according to one embodiment of this application is shown in a very simplified schematic diagram (see [reference]). Figure 8 (A dashed rectangle is defined in the image). For example, brake fluid can be stored in the reservoir 60. The reservoir 60 is used in the vehicle's braking system and includes a filler hose 61. The cap assembly 10 closes the opening of the filler hose 61 in a ventilated manner. Figure 8 As can be seen, the reservoir 60 is installed in the vehicle, and the vehicle's preset wading line 70 is schematically shown in dashed lines. The wading line 70 indicates that the vehicle is permitted to drive normally in water depths below this line. The inlet of the reservoir 60's filling pipe 61 can be sealed in a ventilated manner by means of the cap assembly 10. The vent 44 of the cap assembly 10 is raised above the vehicle's preset wading line 70, particularly by means of the extended portion 42 of the cap assembly 10. Therefore, as long as the vehicle does not exceed the preset wading line 70, water will not enter the reservoir 60 through the vent 44.

[0035] The above descriptions are merely exemplary embodiments of this application. The scope of protection of this application is not limited to the above embodiments, and all technical solutions falling within the concept of this application are within the scope of protection of this application. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this application should also be considered within the scope of protection of this application.

Claims

1. A cover assembly (10) for sealing the opening of the injection pipe (61) of a liquid storage tank (60) in a ventilable manner. Its features are, The cover assembly (10) includes a housing (40) having: The cap portion (41) includes a top wall and an annular side wall extending from the top wall in the axial direction of the cap portion (41) and is capable of being liquid-sealed and detachably connected to the inlet of the injection pipe (61) of the storage tank (60). A tubular extension (42) extending from the top wall of the cap portion (41) in a direction opposite to the side wall of the cap portion (41); and The top (43) closes the end of the extension (42) away from the cap (41). The extended portion (42) has a vent (44) near the top (43), so that when the cap portion (41) is connected to the inlet of the injection pipe (61) of the liquid storage tank (60), the inner cavity of the liquid storage tank (60) is connected to the external environment through the vent (44).

2. The cover assembly (10) according to claim 1. Its features are, The cover assembly (10) includes an insert (30) having a water storage cavity (33) open toward the top (43) of the housing (40), the insert (30) being insertable from the cap portion (41) of the housing (40) and held in an extension portion (42) of the housing (40), wherein there is a gap between the extension portion (42) and the insert (30) forming a ventilation path.

3. The cover assembly (10) according to claim 2. Its features are, The insert (30) has a plurality of elastic legs (31) extending from the bottom of the water storage cavity (33) away from the top (43) of the outer shell (40). The free ends of the elastic legs (31) are provided with hooks (32), which can be engaged in slots (47) provided on the inner wall of the extension (42) of the outer shell (40); or The outer surface of the insert (30) is provided with an external thread, which engages with a corresponding internal thread on the inner wall of the extended portion (42) of the outer shell (40); or The insert (30) is fixed to the inner wall of the extension (42) of the outer shell (40) by welding or bonding.

4. The cover assembly (10) according to claim 2. Its features are, The insert (30) has a return pipe (34) extending from the bottom of the water storage cavity (33) away from the top (43) of the outer shell (40), the return pipe (34) opening toward the cap portion (41) of the outer shell (40).

5. The cover assembly (10) according to claim 4. Its features are, The cover assembly (10) also includes a seal (20) installed in the cap portion (41) of the housing (40). The seal (20) has the following characteristics in the radially outer region: The first sealing surface facing the top wall of the cap portion (41); and The second sealing surface facing away from the top wall of the cap portion (41), When the cap (41) is connected to the inlet of the injection pipe (61) of the storage tank (60), the first sealing surface is tightly attached to the top wall of the cap (41), and the second sealing surface is tightly attached to the end face of the inlet of the injection pipe (61) of the storage tank (60).

6. The cover assembly (10) according to claim 5. Its features are, The central region of the seal (20) is further away from the top wall of the cap (41) than the radially outer region of the seal (20), thereby forming a cup-shaped buffer cavity. The return pipe (34) extends into the buffer cavity, wherein an air vent (21) is formed in the central region of the seal (20).

7. The cover assembly (10) according to claim 2. Its features are, The outer casing (40) has a gas-liquid exchange tube (46) extending from the top (43) toward the cap portion (41) into the water storage cavity (33) of the insert (30) and opening toward the water storage cavity (33), the vent (44) being inserted into the gas-liquid exchange tube (46) and a gap forming a ventilation path existing between the wall of the water storage cavity (33) and the gas-liquid exchange tube (46).

8. The cover assembly (10) according to claim 7. Its features are, The gas-liquid exchange tube (46) extends into the water storage cavity (33) to a depth of at least half the depth of the water storage cavity (33).

9. The cover assembly (10) according to claim 1. Its features are, The diameter of the vent (44) is 0.5 mm to 2 mm.

10. A liquid reservoir (60) for use in a vehicle braking system and including a liquid filling pipe (61). Its features are, The liquid storage tank (60) further includes a cover assembly (10) according to any one of claims 1 to 9, the cover assembly (10) sealing the opening of the injection tube (61) in a ventilable manner.

11. A type of vehicle, Its features are, The vehicle has a reservoir (60) according to claim 10, the reservoir (60) being used to store brake fluid, wherein the vent (44) of the cap assembly (10) of the reservoir (60) is located above a preset wading line (70) of the vehicle.

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