JP2013170510A - Air bleeding structure of tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bleeding structure of tank capable of definitely bleeding air in a tank without leaking a liquid in a tank.SOLUTION: An air bleeding structure of tank includes a tank 1 mounted on a vehicle having a cylindrical body 3 whose opened upper end 31 that is formed upwardly from a tank body 2 that stores a liquid, a plate member 5 that blocks the upper end 31 of the cylindrical body 3, a cap 4 that is attached onto the upper end 31 of the cylindrical body 3 and has an expansion part 44 that is expanded above the plate member 5 and has a communication hole 41a that communicates an internal space 44b of the expansion part 44 with the outside on a top surface part 41, and an air bleeding hole 52 that is bored in the plate member 5, communicates an internal space 2a of the tank body 2 with an internal space 44b of the expansion part 44, wherein the air bleeding hole 52 is disposed inwardly of the curvature and of the center 3C of the cylindrical body 3 as viewed from the side.

Description

  The present invention relates to an air vent structure for a tank that stores a liquid.

  For example, vehicles such as automobiles and buses of water-cooled engines are equipped with radiators that dissipate cooling water whose temperature has been increased by cooling the engine. The radiator is interposed on a cooling path that circulates through the engine, and the radiator and the cooling path are filled with cooling water. The volume of the cooling water increases with an increase in temperature, and conversely decreases with a decrease in temperature. Therefore, the pressure in the radiator and the cooling path changes with the temperature change of the cooling water.

  On the other hand, in the cooling passage, a radiator and a radiator cap for adjusting the pressure in the cooling path are mounted, and the radiator cap is connected to a tank for storing cooling water through a pipe. Yes. That is, the radiator and the tank are communicated with each other through the piping. When the pressure in the radiator and the cooling path increases, the cooling water flows out of the radiator cap and flows to the tank through the piping. Conversely, when the pressure in the radiator and the cooling path decreases, cooling water flows from the tank to the radiator cap and is replenished to the radiator. As described above, the tank has a function of temporarily receiving (storing) the cooling water in the radiator and a function of replenishing the radiator with the cooling water.

  The tank is provided with a water inlet at an upper portion thereof, and cooling water is injected from the water inlet into the tank. Except for the case of injecting cooling water, a cap is attached to the water injection port to prevent leakage of cooling water in the tank and entry of foreign matter. Further, the cap is provided with a hole (air vent hole) that communicates between the inside and outside of the tank, and air (air) generated in the radiator and the cooling path is released from the hole, so that the pressure in the tank is kept constant.

  As a structure of a cap provided in such a tank, for example, a technique as described in Patent Document 1 has been proposed. In this technology, a labyrinth structure for preventing liquid leakage is provided in the vicinity of the inlet portion of the overflow passage of the cap, and a labyrinth structure for sealing is also formed on the contact surface between the lower surface of the cap and the upper surface of the water inlet of the tank body. . In particular, the labyrinth structure for preventing liquid leakage is a baffle wall extending obliquely downward from the inlet portion of the overflow passage on the lower surface of the cap.

Japanese Patent Laid-Open No. 2003-232222

  However, since the tank described above is mounted on a vehicle, the cooling water in the tank may be swung due to shaking during traveling, and may leak outside through a hole for extracting air. In this case, in the above-mentioned Patent Document 1, most of the cooling water bounces off the baffle wall, but a part of the cooling water is discharged from the overflow passage, so that the leakage of the cooling water cannot be surely prevented.

In general, tanks are often placed in the engine room, and the tank shape is regulated based on the layout with peripheral devices, ensuring a tank height that can sufficiently prevent leakage of cooling water. There are things that cannot be done. Therefore, when the cooling water flows from the radiator cap to the tank and the amount of the cooling water in the tank increases, the surface height of the cooling water may rise to near the upper air vent hole. In such a case, if the tank is shaken, the risk of cooling water leaking from the tank increases.
Such a problem is not limited to the tank described above, and is a problem common to tanks in which liquid is stored and provided with holes for venting the air inside.

The present invention has been devised in view of the problems as described above, and it is an object of the present invention to provide a tank air bleed structure that can surely evacuate the air in the tank without leaking the liquid in the tank. And
The present invention is not limited to this purpose, and is a function and effect derived from each configuration shown in the embodiments for carrying out the invention described later, and other effects of the present invention are to obtain a function and effect that cannot be obtained by conventional techniques. Can be positioned.

  (1) A tank air vent structure disclosed herein includes a tank that is mounted on a vehicle and has a cylindrical body that is curved upwardly from a tank body that stores liquid and has an open upper end, and the cylindrical body. A plate-like member that closes the upper end portion of the cylindrical member, and a bulge portion that is attached to the upper end portion of the cylindrical body and bulges upward from the plate-like member, and an internal space of the bulge portion, A cap having a communication port communicating with the outside on the top surface portion, and an air vent hole that is perforated in the plate-like member and communicates the internal space of the tank body and the internal space of the bulging portion, The air vent hole is arranged on the inner side of the curve than the center of the cylindrical body in a side view.

(2) Moreover, the said cap has an abutting part which the said upper end part of the said cylindrical body contact | abuts to an inner peripheral surface, The said plate-shaped member is the said upper end part of the said cylindrical body, and the said cap of the said cap It is preferable that the tank and the cap are sealed by being sandwiched between the contact portions.
(3) Moreover, it is preferable that the said air vent hole is provided in the position in alignment with the internal peripheral surface of the said bulging part.

(4) Moreover, it is preferable that the path | route which passes along the said air vent hole, the internal space of the said bulging part, and the said communicating port is formed in a labyrinth structure.
Here, the “labyrinth structure” means a structure in which a path from the internal space of the tank body through the air vent hole, the internal space of the bulging portion, and the communication port is reversed halfway. That is, even when the liquid flows into the internal space of the bulging portion from the air vent hole, the flow direction of the liquid is U-turned at least at one place. In other words, the flow direction of the liquid in a certain part is a predetermined direction, and the passage in which the flow direction of the liquid is opposite to the predetermined direction exists in at least one place in another part.

  (5) Further, the plate-like member is fitted in the inner peripheral surface of the cap in advance, and the cap has a pipe connected to the communication port and communicating the internal space of the bulging portion and the outside. The pipe is bent so that an opening opposite to the communication port faces the position of the air vent hole provided in the plate-like member, and the path is formed from the inside of the tank and the air vent hole and the More preferably, the labyrinth structure is formed through the communication port and through the pipe.

  According to the disclosed tank air vent structure, the air in the tank can be extracted to the outside through the air vent hole formed in the plate-like member and the communication port provided in the top surface portion of the cap. Further, even if the liquid stored in the tank main body is swung by vibration during traveling of the vehicle, since the cylindrical body is formed upward from the tank main body, the rise of the liquid can be suppressed. The risk of liquid leaking to the outside can be reduced. In addition, the liquid in the tank is likely to rise along the outside of the curve from the center of the cylindrical body when the tank is swung, but even if the liquid rises through the curved portion of the cylindrical body, This liquid can be rebounded by the plate-like member that closes the upper end of the body, and the liquid can be prevented from leaking to the outside.

  Further, since the air vent hole drilled in the plate-like member is disposed inside the curve from the center of the cylindrical body in a side view, the liquid rising along the curved portion passes through the air vent hole. Therefore, it is possible to prevent the plate member from entering upward. Also, even if the liquid enters the upper side of the plate-like member through the air vent hole, the cap is provided with a bulge portion that bulges upward from the plate-like member. The liquid can be retained in the interior space of the liquid crystal, and leakage of the liquid to the outside can be suppressed. That is, the air in the tank can be surely extracted while preventing the liquid in the tank from leaking.

It is a whole block diagram for demonstrating the air bleeding structure of the tank which concerns on one Embodiment, (a) is a top view, (b) is a rear view, (c) is a side view. It is a block diagram of the cap used for the air bleeding structure of the tank which concerns on one Embodiment, (a) is a top view, (b) is a rear view, (c) is a side view, (d) is a bottom view. It is AA arrow sectional drawing of Fig.1 (a).

  Hereinafter, embodiments will be described with reference to the drawings. Note that the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described in the following embodiment.

[1. Overall structure]
A tank air vent structure according to the present embodiment will be described with reference to FIGS. This tank is mounted on a vehicle such as an automobile or a bus having a water-cooled engine. In the following description, the direction in which gravity acts is assumed to be downward, and the opposite is assumed to be upward. This tank is mounted on the vehicle while maintaining the vertical relationship shown in FIGS. Here, an example in which cooling water for cooling the engine is used as the liquid stored in the tank will be described.

  As shown in FIGS. 1A to 1C and FIG. 3, the tank 1 has a tank body 2 that stores cooling water 10, and is curved upward from the tank body 2, and an upper end 31 is opened. And a cylindrical body 3. In addition, a connection end 22 for connecting a pipe (not shown) is provided on the bottom 21 of the tank body 2. The pipe connected to the connection end 22 is connected to a radiator cap (not shown). That is, the tank 1 is communicated with the radiator cap via the piping, and is also in communication with a cooling path in which a hermetic radiator for cooling the engine is interposed. In addition, the connection end part 22 should just be provided in the bottom part 21 vicinity of the tank main body 2, and is not restricted to the position shown in FIG.

  The tank 1 is a so-called condensation tank or reservoir having a function of temporarily receiving (storing) the cooling water 10 in the radiator and a function of replenishing the cooling water 10 into the radiator in accordance with a pressure change in the radiator. It is called a tank. That is, when the pressure in the radiator increases, the cooling water 10 flowing out from the radiator is received. Conversely, when the pressure in the radiator decreases, the cooling water 10 is replenished to the radiator. Further, the tank 1 has a function of separating air (air) generated in the radiator and the cooling path from the cooling water 10 and discharging excess air to the outside.

  The tank body 2 is a container having an internal space 2a, and here has a shape having uneven portions 24a and 24b as shown in FIG. 1 because of the layout relationship with other devices in the engine room where the tank 1 is disposed. It has become. The shape of the tank main body 2 is not limited to this, and has a capacity sufficient to store the cooling water 10 and can be changed as appropriate from the layout relationship with the peripheral devices.

  The cylindrical body 3 is a cylindrical portion of the tank 1 provided on the side portion 23 of the tank main body 2, and protrudes above the upper surface 25 of the tank main body 2. In other words, the upper end portion 31 of the cylindrical body 3 is configured to be the uppermost end of the tank 1. This is because the cooling water 10 and air are separated in the tank 1, and excess air in the tank 1 is extracted from the opening of the upper end portion 31 of the cylindrical body 3 to the outside. The opening of the upper end portion 31 of the cylindrical body 3 is a water inlet for injecting and replenishing cooling water into the tank 1. The vehicle mounting position of the tank 1 is not particularly limited.

The cylindrical body 3 is formed to be curved by extending backward from the side portion 23 of the tank body 2 and further upward, and is integrally formed with the tank body 2. That is, at the lower part of the cylindrical body 3, the curved inner side 34a is formed to have a smaller radius of curvature than the central side 3C of the cylindrical body 3 than the curved outer side 34b in a side view. Hereinafter, the lower part of the cylindrical body 3 (the part curved from the tank body 2) is referred to as a curved part 34. The cylindrical body 3 has a bent pipe-shaped internal space 3 a communicating with the internal space 2 a of the tank body 2.
The cylindrical body 3 has a threaded portion 32 on the outer peripheral surface slightly below the upper end portion 31. In the tank 1, the screw portion 43 a of the cap 4 is screwed into the screw portion 32 except when cooling water is injected into the tank 1, and the cap 4 is attached to the opening of the cylindrical body 3.

  As shown in FIGS. 2A to 2D and FIG. 3, the cap 4 has a circular top surface portion 41 and a periphery extending downward from the outer periphery of the top surface portion 41 and having a uniform thickness. It is a lid member having a surface portion. The peripheral surface portion 42 of the cap 4 has a screwed portion 43 having a screw portion 43a on the inner peripheral surface, and a bulged portion 44 having an inner diameter smaller than that of the screwed portion 43 and bulging upward from the packing 5 described later. It consists of.

  The threaded portion 43 is a portion located on the opening side of the peripheral surface portion 42 of the cap 4, and has an inner diameter slightly larger than the outer diameter of the cylindrical body 3. On the other hand, the bulging portion 44 is a portion of the peripheral surface portion 42 of the cap 4 on the top surface 41 side of the cap 4 located above the screwing portion 43, and has an inner diameter substantially the same as the inner diameter of the cylindrical body 3. Have That is, since the diameter of the peripheral surface portion 42 is different between the screwing portion 43 and the bulging portion 44, a step portion 45 is formed at the boundary between the screwing portion 43 and the bulging portion 44. The step 45 is a portion (contact portion) where the upper end portion 31 of the cylindrical body 3 contacts (or faces) when the cap 4 is attached to the cylindrical body 3. Here, the stepped portion 45 is located at the approximate center of the circumferential surface portion 42 in the height direction.

  The top surface portion 41 of the cap 4 is formed with a communication port 41a that allows communication between the space surrounded by the peripheral surface portion 42 of the cap 4 and the outside (that is, in the atmosphere), and a pipe 46 is connected to the communication port 41a. Yes. That is, the space surrounded by the peripheral surface portion 42 of the cap 4 and the outside communicate with each other via the communication port 41 a and the pipe 46. Here, one end of the pipe 46 penetrates the top surface portion 41 and protrudes downward from the lower surface of the top surface portion 41, and the top surface portion 41 and the pipe 46 are integrally formed, and the opening at one end of the pipe 46 is in communication. It functions as the mouth 41a. The pipe 46 extends upward from one end penetrating the top surface portion 41, is bent at an intermediate portion, and has an opening 46a at the other end facing sideways. Here, the opening 46a at the other end is located on the inner side 34a of the curve from the center 3C of the cylindrical body 3 in a side view.

  A packing (plate member) 5 formed in a circular plate shape having an outer diameter substantially the same as the inner diameter of the screwing portion 43 is fitted into the inner peripheral surface of the cap 4, and the cylindrical body is formed by the packing 5. 3 is closed. Here, the packing 5 is fitted in advance on the inner peripheral surface above the threaded portion 43a of the screwing portion 43 so as to contact the lower surface 45a of the stepped portion 45 (hereinafter, this surface is referred to as the contacting surface 45a). Fixed. Thereby, a space 44b (hereinafter, this space is referred to as an internal space 44b) surrounded by the lower surface of the top surface portion 41, the inner peripheral surface 44a of the bulging portion 44 and the upper surface of the packing 5 is formed. The communication port 41 a formed in the top surface portion 41 is an opening that communicates the internal space 44 b of the bulging portion 44 with the outside.

  The packing 5 is sandwiched between the upper surface of the upper end portion 31 of the cylindrical body 3 and the contact surface 45 a of the stepped portion 45 of the cap 4 when the cap 4 is attached to the upper end portion 31 of the cylindrical body 3. A sealing member for sealing the tank 1 and the cap 4. That is, the packing 5 is cooled from between the cylindrical body 3 and the cap 4 by sandwiching the outer peripheral portion (seal part 51) between the upper end portion 31 of the cylindrical body 3 and the step 45 of the cap 4. It has a function as a seal member that prevents leakage of water 10. Further, the packing 5 closes the opening of the cylindrical body 3, so that when the cooling water 10 in the tank 1 rises along the curved portion 34 of the cylindrical body 3, the cooling water 10 bounces off the outside. It also functions as a reflector to prevent leakage.

  On the surface of the packing 5, an air vent hole 52 that communicates the internal space 3 a of the cylindrical body 3 and the internal space 44 b of the bulging portion 44 is formed. The air vent hole 52 is a circular opening for drawing air (air) in the tank 1 and has a diameter of several millimeters (for example, 2 millimeters). The air vent hole 52 is disposed so as to be located on the inner side 34a curved from the center 3C of the cylindrical body 3 in a side view (that is, substantially below the opening 46a at the other end of the pipe 46 provided in the cap 4). . In other words, the cap 4 is attached to the cylindrical body 3 so that the opening 46a of the pipe 46 and the air vent hole 52 are located on the inner side 34a (right side in FIG. 3) of the curved portion 34 of the cylindrical body 3. Here, two air vent holes 52 are provided, but the size and number of the air vent holes 52 are not limited to this, and may be any size and number that allow the air in the tank 1 to surely escape.

  As shown in FIGS. 2D and 3, the air vent hole 52 is provided at a position along the inner peripheral surface 44 a of the bulging portion 44. Here, the “position along the inner peripheral surface” means only when a part of the circumference of the air vent hole 52 is directly below the inner peripheral surface 44a of the bulging portion 44 (ie, exactly along the inner peripheral surface). In addition, a state in which a part of the air vent hole 52 is sandwiched between the step portion 45 and the upper end portion 31 of the cylindrical body 3 is also included. In other words, it means a position where at least the cooling water 10 flowing out from the air vent hole 52 comes into contact with the inner peripheral surface 44 a of the bulging portion 44.

[2. Air bleeding structure]
When the cap 4 is attached to the upper end portion 31 of the cylindrical body 3, a communication path through which the air in the tank 1 escapes to the outside is formed. This communication path is configured with the air vent hole 52 of the packing 5 as an inlet, the communication port 41a of the cap 4 to the pipe 46, and the opening 46a at the other end of the pipe 46 as an outlet.

  That is, the air separated from the cooling water 10 in the tank 1 passes through the air vent hole 52 of the packing 5 and moves from the internal space 3 a of the cylindrical body 3 of the tank 1 to the internal space 44 b of the bulging portion 44. . Next, in the internal space 44b of the bulging portion 44, the air flows toward the communication port 41a in the center direction, and flows into the pipe 46 from the communication port 41a. Then, the pipe 46 passes through the opening 46a to the outside.

  Thus, in order to evacuate the air in the tank 1, the inside of the tank 1 and the outside communicate with each other via the communication path. In other words, the tank 1 is not sealed. Therefore, there is a considerable possibility that the cooling water 10 in the tank 1 leaks to the outside due to shaking while the vehicle is running. On the other hand, in this air vent structure, since the path 9 passing through the air vent hole 52, the internal space 44b of the bulging portion 44 and the communication port 41a is formed in the labyrinth structure, the leakage of the cooling water 10 is prevented. Prevents to the maximum.

  The “labyrinth structure” referred to here is a structure in which the path 9 passing from the internal space 2a of the tank body 2 to the air vent hole 52, the internal space 44b of the bulging portion 44, and the communication port 41a is reversed halfway. means. That is, even when the cooling water 10 flows into the internal space 44b of the bulging portion 44 from the air vent hole 52, the flow path structure has a U-turn in the flow direction of the cooling water 10 at least at one place. In other words, a structure in which the flow direction of the cooling water 10 in a certain part is a predetermined direction and the passage in which the flow direction of the cooling water 10 is opposite to the predetermined direction exists in at least one other part. It is.

  The path 9 basically has the air vent hole 52 of the packing 5 as an inlet, and continues from the communication port 41a of the cap 4 to the pipe 46, and the opening 46a at the other end of the pipe 46 as an outlet, as in the above communication path. It is configured. In order for the cooling water 10 to leak from the internal space 3 a of the cylindrical body 3 of the tank 1 to the internal space 44 b of the bulging portion 44, the cooling water 10 must pass through the air vent hole 52 of the packing 5 with the flow direction facing upward. At this time, since the cooling water 10 has a certain amount of momentum, the cooling water 10 collides with the lower surface of the top surface portion 41, and the flow direction thereof is changed to the center direction or slightly downward in the center direction.

  In order for the cooling water 10 that has flowed into the internal space 44b of the bulging portion 44 to further pass through the communication port 41a, the flow direction must be reversed from the downward direction to the upward direction in the central direction or the central direction. Furthermore, the flow direction of the cooling water 10 in the pipe 46 must be changed from the upward direction to the opposite direction to the central direction (that is, it must be reversed in the direction in which the air vent hole 52 is provided). That is, the path 9 in this embodiment has two places where the flow direction is reversed, and in order for the cooling water 10 to leak from the tank 1 to the outside, such a complicated labyrinth structure is required. I must.

[3. effect]
Therefore, according to the air vent structure of the tank according to the present embodiment, the air in the tank 1 is externally passed through the air vent hole 52 formed in the packing 5 and the communication port 41 a provided in the top surface portion 41 of the cap 4. Can be pulled out. Further, even if the cooling water 10 stored in the tank main body 2 is swung due to vibration during traveling of the vehicle, the cylindrical body 3 is formed upward from the tank main body 2. The rise can be suppressed, and the risk that the cooling water 10 leaks to the outside can be reduced. Further, even when the cooling water 10 rises along the curved outer side 34b from the center 3C of the cylindrical body 3 in a side view, the cooling water 10 is supplied by the packing 5 that closes the upper end portion 31 of the cylindrical body 3. It can be rebounded, and it can suppress that the cooling water 10 leaks outside.

  Furthermore, since the air vent hole 52 drilled in the packing 5 is disposed on the curved inner side 34a with respect to the center 3C of the cylindrical body 3 in a side view, the cooling water 10 rising along the curved outer side 34b. Can be prevented from entering above the packing 5 through the air vent hole 52 (that is, into the internal space 44b of the bulging portion 44). Further, even if the cooling water 10 enters above the packing 5 through the air vent hole 52, the cap 4 is provided with the bulging portion 44 that bulges above the packing 5, so this The cooling water 10 can be retained in the internal space 44b of the bulging portion 44, and leakage of the cooling water 10 to the outside can be suppressed. That is, the air in the tank 1 can be surely extracted while preventing the cooling water 10 in the tank 1 from leaking.

  Further, when the cooling water 10 in the tank 1 moves up the cylindrical body 3, the packing 5 functions as a reflection plate that repels the cooling water 10 and prevents leakage to the outside. And a function as a sealing member for preventing leakage of the cooling water 10 from between the cap 4 and the cap 4. In other words, since the seal member and the reflecting plate are integrated by the packing 5, the number of parts can be reduced and the cost increase can be suppressed. Moreover, while the packing 5 is inserted | pinched between the upper end part 31 and the step part 45 of the cylindrical body 3, while being able to improve a sealing performance, the packing 5 can be fixed accurately.

  Further, since the air vent hole 52 drilled in the packing 5 is provided at a position along the inner peripheral surface 44a of the bulging portion 44, even if the coolant 10 leaks from the air vent hole 52, the coolant water 10 is in contact with the inner peripheral surface 44 a of the bulging portion 44, the momentum of the cooling water 10 can be dispersed (weakened), and the cooling water 10 can be efficiently retained in the internal space 44 b of the bulging portion 44. The leakage of the cooling water 10 to the outside can be further suppressed.

  Further, since the path 9 is formed in a labyrinth structure, air can be reliably extracted from the tank 1 while preventing leakage of the cooling water 10. In particular, in the present embodiment, since the path 9 is formed in a complicated labyrinth structure, air can be reliably extracted from the tank 1 while preventing leakage of the cooling water 10 more reliably. In addition, since the packing 5 is fixed to the inner peripheral surface of the cap 4 in advance, the mounting work of the cap 4 and the packing 5 to the cylindrical body 3 can be easily performed.

[4. Others]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
In the above embodiment, the packing 5 is fixed to the inner peripheral surface of the cap 4 in advance, and the air vent hole 52 is provided at a position along the inner peripheral surface 44a of the bulging portion 44. What is necessary is just to be arrange | positioned in the curved inner side 34a rather than the center 3C of the cylindrical body 3 in the side view. In other words, when the packing 5 is attached to the upper end portion 31 of the cylindrical body 3, the air vent hole 52 is located on the semicircular surface of the inner side 34a of the curve from the center 3C of the cylindrical body 3 in a side view. It only has to be perforated.

  Moreover, in the said embodiment, although the packing 5 is comprised combining the function as a sealing member and the function as a reflecting plate (namely, integrated), you may provide separately. . That is, a sealing member (for example, an O-ring, an annular packing, etc.) may be provided separately from the plate-like member as the reflecting plate.

  Further, the shape of the cap 4 is not limited to the above. For example, the inner diameter of the peripheral surface portion may be the same, and a protruding portion that protrudes inward may be provided at an intermediate portion in the height direction of the peripheral surface portion. This protrusion is a substitute for the step 45 described above, and the top surface 41 side of the protrusion may be the bulging portion, and the opening side of the protrusion may be the screwing portion. Further, the shape of the pipe 46 is not limited to the above, and a configuration in which the pipe 46 is not provided may be employed.

Further, the communication path through which the air passes is not limited to the above-described structure. Similarly, the path 9 is not limited to the labyrinth structure, and may be any labyrinth structure. Moreover, it does not necessarily need to be formed in the labyrinth structure.
The air bleeding structure can be applied to various tanks (for example, a motor cooling water tank and a washer liquid tank) of various vehicles such as automobiles, trucks, and buses. Further, the liquid stored in the tank is not limited to the cooling water, and may be a washer liquid or the like.

DESCRIPTION OF SYMBOLS 1 Tank 2 Tank main body 2a Internal space of tank main body 3 Cylindrical body 3a Internal space of cylindrical body 3C Center of cylindrical body 31 Upper end part 34 Curved part 34a Curved inner side 4 Cap 41 Top surface part 41a Communication port 44 Swelling part 44a Inner peripheral surface 44b Internal space of the bulging part 45 Step part (contact part)
46 Pipe 46a Pipe opening 5 Packing (plate-shaped member)
52 Air vent hole 9 Path 10 Cooling water

Claims (5)

A tank that is mounted on a vehicle and has a cylindrical body that is curved upward from a tank body that stores liquid and has an upper end opened;
A plate-like member that closes the upper end of the cylindrical body;
It has a bulging portion that is attached to the upper end portion of the cylindrical body and bulges upward from the plate-like member, and has a communication port in the top surface portion that communicates the internal space of the bulging portion with the outside. A cap,
An air vent hole that is perforated in the plate-like member and communicates the internal space of the tank body and the internal space of the bulging portion;
The air vent structure for a tank, wherein the air vent hole is disposed on the inner side of the curve than the center of the cylindrical body in a side view. The cap has an abutting portion with which the upper end portion of the cylindrical body abuts on an inner peripheral surface,
The said plate-shaped member is inserted | pinched between the said upper end part of the said cylindrical body, and the said contact part of the said cap, The said tank and the said cap are sealed, The Claim 1 characterized by the above-mentioned. Tank air bleeding structure. The tank air vent structure according to claim 1 or 2, wherein the air vent hole is provided at a position along an inner peripheral surface of the bulging portion. The tank air according to any one of claims 1 to 3, wherein a path passing through the air vent hole, an internal space of the bulging portion, and the communication port is formed in a labyrinth structure. Unplug structure. The plate-like member is fitted in the inner peripheral surface of the cap in advance,
The cap has a pipe connected to the communication port and communicating the internal space of the bulging portion with the outside;
The pipe is bent so that the opening opposite to the communication port faces the position of the air vent hole provided in the plate-like member,
The tank air vent structure according to claim 4, wherein the path is formed in the labyrinth structure from the inside of the tank through the air vent hole and the communication port and further through the pipe.

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