JP2008190443A - Reservoir tank and engine cooling system having the tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive reservoir tank capable of surely preventing the mixing of air in a coolant to an engine side in a traveling state that large acceleration acts, even if a tank height is limited. <P>SOLUTION: This sealed reservoir tank has a tank body 21 storing cooling water L together with its upper air reservoir by forming a filler hole 21a for filling the cooling water L in an upper part by connecting a pipe by a lower part on one side in the horizontal direction to the radiator 12 side for cooling the cooling water L circulating in an engine 11, and a tank cap 22 for sealing the filler hole 21a. The tank body 21 has a swelling part 25 swelling in the direction separating from the lower part on one end side in the horizontal direction in a lower part on the other end side in the horizontal direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a reserve tank and an engine cooling device including the tank, and more particularly to a hermetic reserve tank and an engine cooling device that form an air reservoir that changes in volume according to a change in the coolant level above the coolant. .

  In the reserve tank equipped in the internal combustion engine cooling device, the water injection port formed in the upper part of the reserve tank is sealed with a pressure-sealing cap, and an air reservoir is formed above the cooling water stored in the interior of the reserve tank. There is a sealed type that absorbs a change in liquid level accompanying a change in temperature by a change in volume of an air reservoir.

  In addition, such a reserve tank is connected to the upper part of the radiator, which is the return side of the cooling water from the engine, by piping so as to allow the cooling water to enter and exit, and from the lower part of the radiator to the cooling water supply path side (hereinafter referred to as the cooling water) Many of them are connected by piping so as to supply cooling water to the engine side.

As a conventional reserve tank of this type, a partition plate is provided so as to divide the inside of the tank into a plurality of storage chambers adjacent in the longitudinal direction of the vehicle, and a main air reservoir is formed in the storage chamber on the front end side thereof. In this reserve tank, the radiator side communicating hole for allowing cooling water to enter and exit from the radiator side is opened to the upper side of the tank, and the engine side communicating hole for supplying cooling water to the engine side is provided on the lower side of the tank. (For example, refer to Patent Document 1).
JP-A-5-98964

  However, in the conventional reserve tank as described above and the cooling device for a vehicle including the same, a traveling state such as cornering in which a large lateral acceleration (so-called lateral G) acts on the vehicle is maintained for a relatively long time. In such a case, air is mixed into the cooling water supplied to the engine side, so that cavitation occurs in the water pump, and the cooling performance of the engine is deteriorated.

  In other words, if the liquid level fluctuates for a short time due to sudden acceleration or braking of the vehicle, it can be avoided by inserting a partition such as a baffle plate with an appropriate communication hole, but large lateral acceleration continues for a relatively long time. When the vehicle is in a running state, the liquid level in the tank may be greatly inclined, and the communication hole on the engine side that opens into the coolant in the reserve tank may come out of the liquid level and lead to an air reservoir. In that case, since air is mixed in the cooling water supplied to the engine side through the communication hole portion on the engine side, the cooling performance is deteriorated.

  For this reason, the conventional reserve tank and the cooling device for a vehicle including the same cannot cope with a case where the above-described liquid level inclination becomes significant, for example, during circuit running.

  In addition, the radiator side communication hole for returning the cooling water into the reserve tank when the pressure in the radiator increases is opened to the upper side of the tank, so the radiator side communication hole is separated from the engine side communication hole. Therefore, it is not easy to keep the height of the reserve tank low because it is necessary to prevent air from entering the cooling water, and the return of cooling water from the reserve tank side becomes worse, so it can withstand the rise in internal pressure on the radiator side. It was necessary to increase the strength of the tank to obtain it. For this reason, there are problems with the layout and cost of the reserve tank.

  Therefore, the present invention provides a low-cost reserve that can reliably prevent air from being mixed into the coolant to the engine side under traveling conditions in which a large acceleration acts even if the tank height is suppressed. The purpose is to provide a tank.

  In order to achieve the above object, the present invention provides: (1) A pipe is connected to the radiator side at the lower part at one end in the horizontal direction, and an inlet for injecting the cooling liquid is formed at the upper part. A sealed reserve tank comprising a tank body that is stored together with a cap that seals the inlet, and a direction in which the tank body is separated from a lower portion at one end in the horizontal direction at a lower portion at the other end in the horizontal direction. It has the bulging part which bulged in.

  In this reserve tank, a sufficient amount of coolant can be stored in the lower part of the tank by the bulging part, so that the required air pool can be formed even if the tank height is reduced. From the radiator side during engine operation, It is possible to reliably absorb the return of the coolant. Moreover, even if the coolant level in the reserve tank inclines during operation, the level is limited to the upper part of the horizontal cross-sectional area that is narrow compared to the lower part of the reserve tank. The lower part on the one end side in the horizontal direction is not exposed on the liquid surface, and the arrangement state in the lower part on the one end side in the horizontal direction is maintained. Moreover, since the pipe connection to the radiator side is made at the lower part on the one end side in the horizontal direction and the liquid level is kept low, an increase in the internal pressure of the radiator can be suppressed. The direction away from the lower portion on one end side in the horizontal direction is not limited to the direction from one end side to the other end side in the horizontal direction, but may be a substantially horizontal direction intersecting therewith.

  In the present invention, (2) an inlet for injecting the cooling liquid is formed at the upper part of the radiator at the return side and the supply side of the cooling liquid at the lower part at one end in the horizontal direction. In a sealed reserve tank comprising a tank body that stores together with an air reservoir thereabove and a cap that seals the inlet, the tank body is disposed at the lower part on the other end side in the horizontal direction of the tank body. A bulging portion that bulges away from a lower portion on one end side in the direction, and protrudes upward from the inner bottom surface of the tank main body and extends from the one horizontal end to the other horizontal end in the tank main body. A partition wall section that divides and divides the interior into a plurality of storage chambers that communicate with the coolant return side and the supply-side passage of the radiator, and the partition walls include the plurality of storage chambers within the bulge portion. Communicate Yo wherein the communication holes are formed.

  In this reserve tank, a sufficient amount of coolant can be stored in the lower part of the tank by the bulging part, so that the required air pool can be formed even if the tank height is reduced. From the radiator side during engine operation, It is possible to reliably absorb the return of the coolant. Moreover, even if the coolant level in the reserve tank inclines during operation, the level is limited to the upper part of the horizontal cross-sectional area that is narrow compared to the lower part of the reserve tank. The lower part on one end side in the horizontal direction connected to the supply side by piping is not exposed on the liquid level, and the lower liquid arrangement state on the one end side is maintained. In addition, since the communication hole that connects the storage chambers is located in the bulging portion, the bubble-containing coolant entering the one storage chamber from the radiator side immediately enters the other storage chamber and is supplied to the engine side. There is no such thing. Furthermore, piping connection to the radiator side and the engine side is made at the lower part on the one end side in the horizontal direction, and the liquid level is also kept low, so that an increase in the internal pressure of the radiator can be suppressed.

  In the reserve tank having the configuration of (2), preferably, (3) the partition wall is formed with a communication hole for air circulation for communicating the plurality of storage chambers in the upper part of the tank body. is there.

  With this configuration, air pools having a uniform pressure can be formed in the plurality of storage chambers.

  It is desirable that the reserve tank having any one of the constitutions (1) to (3) is (4) mounted on the vehicle with the both ends in the horizontal direction facing in the left-right direction of the vehicle.

  This maintains the submerged arrangement of the liquid at the lower end on one end in the horizontal direction connected to the radiator or even the engine, even when the vehicle is traveling for a relatively long time, such as cornering where large lateral acceleration is applied. can do.

  In the reserve tank having any one of the constitutions (1) to (4), (5) the inner width in the horizontal direction of the upper portion of the tank body is larger than the inner diameter of the injection port.

  In this case, water injection workability is improved.

  In the reserve tank having the configuration of any of (1) to (5) above, (6) the inner surface height of the bulging portion from the inner bottom surface of the tank body is the height from the inner bottom surface of the tank body. It is preferable that it is located above the allowable range of the liquid level when the cooling liquid is injected.

  Thereby, an air pocket can fully be formed.

  On the other hand, the engine cooling device of the present invention (7) circulates the reserve tank having any one of the constitutions (1) to (6), the radiator, and the coolant through the engine and the radiator. And a water pump.

  With this configuration, the acceleration toward the other end in the horizontal direction during engine operation acts on the reserve tank, and even if the liquid level of the coolant stored in the reserve tank is inclined toward one end side in the horizontal direction, the liquid level is It is limited to the upper part where the horizontal cross-sectional area is narrow compared with the lower part of the reserve tank, and the lower part on one end side in the horizontal direction connected to the radiator side can be maintained in the liquid without exposing it on the liquid level. Become. Therefore, the problem that cavitation occurs in the water pump due to the mixing of air into the coolant supplied from the reserve tank to the engine side, and the problem that the cooling performance of the engine deteriorates is solved.

  In the engine cooling device having the configuration of (7), (8) the reserve tank is mounted on a vehicle on which the engine is mounted with the horizontal one end and the other end facing left and right. Features.

  With this configuration, even when the running state such as cornering where a large lateral acceleration is applied continues for a relatively long time, the submerged arrangement state of the lower part at one end in the horizontal direction connected to the radiator side or further to the engine side is maintained. Can be maintained.

  According to the present invention, a sufficient amount of coolant stored in the lower portion of the tank is secured by the bulging portion, so that the required air pool is formed even when the tank height is suppressed, and cooling from the radiator side during engine operation is performed. Even if the return of the liquid can be absorbed reliably, and the acceleration toward the other end in the horizontal direction acts during operation and the cooling liquid level in the reserve tank is inclined toward the one end in the horizontal direction, the liquid level is reduced. Restricted to the upper part of the horizontal cross-sectional area that is narrower than the lower part of the reserve tank, the lower part of one end in the horizontal direction connected to the radiator side is maintained in the liquid without exposing it to the liquid level. be able to. Furthermore, since the pipe connection to the radiator side is made at the lower part on the one end side in the horizontal direction and the liquid level is kept low, an increase in the internal pressure of the radiator can also be suppressed. As a result, a low-cost reserve tank is provided that can reliably prevent air from being mixed into the coolant to the engine side even when the tank height is reduced, even under traveling conditions in which large acceleration is applied. can do.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
1 to 3 are views showing a reserve tank according to a first embodiment of the present invention and an engine cooling apparatus including the reserve tank.

  First, the configuration will be described.

  As shown in FIG. 1, the engine cooling device 1 of the present embodiment includes a radiator 12, an upper hose 13, a lower hose 14, a water pump 15, a thermostat 16, and a hermetic reserve tank 20.

  The radiator 12 is a heat that cools the coolant that has passed through a cooling passage 11w (water jacket; details are not shown) in the engine 11 that is an internal combustion engine, for example, by exchanging heat with air supplied as cooling air. It is an exchanger, and has an upper tank portion 12 a that is a return side of cooling water from the engine 11 and a lower tank portion 12 b that is a supply side of cooling water to the engine 11.

  The upper hose 13 and the lower hose 14 are connected to the cooling passage 11w in the engine 11 and the heat exchange passage in the radiator 12, so that the cooling water inlet 11a and the cooling water outlet 11b of the engine 11 and the upper tank portion 12a and the lower tank portion of the radiator 12 are communicated. It is piping with heat resistance and pressure resistance which connects 12b.

  The water pump 15 is built in the engine 11 so as to be rotated by power from the engine 11, and high-temperature cooling water flows into the radiator 12 from the engine 11 through the upper hose 13, and is cooled by heat exchange in the radiator 12. The cooling water is circulated through a predetermined circulation path that is supplied to the engine 11 through the lower hose 14 or from the engine 11 through the pipes 18a and 18b and the vehicle interior side heater 19 (heat exchanger for heater). ing. The thermostat 16 is disposed on the suction side of the water pump 15 and functions as a flow rate adjusting valve that opens and closes according to the cooling water temperature, so that the flow rate of the coolant passing through the radiator 12 can be adjusted. It has become.

  The radiator 12 has a water inlet 12c at the upper portion thereof, and a pressurized / sealed radiator cap 17 is detachably attached to the water inlet 12c.

  The pressurizing / sealing radiator cap 17 has a valve function that opens and closes in response to a change in the internal pressure of the radiator 12. The cooling water (vapor bubbles are supplied to the reserve tank 20 connected to the vicinity of the water inlet 12 c by piping. (Including)).

  The radiator 12, the upper hose 13, the lower hose 14, the water pump 15 and the thermostat 16 are the same as known ones.

  On the other hand, the reserve tank 20 is attached to the vehicle in a state in which the longitudinal direction is substantially horizontal and one end and the other end in the horizontal direction are directed to the left and right as a part of the engine cooling device 1 and directed to the left and right of the vehicle. It is installed. The reserve tank 20 is connected to the upper tank portion 12a of the radiator 12 (return side of the cooling water) via the connection pipes 29a and 29b, and the suction side of the water pump 15 that is the cooling water supply side to the engine 11. Each pipe is connected.

  As shown in FIGS. 2 and 3, the reserve tank 20 has a water injection port 21a (injection port) for injecting cooling water L into the upper portion (the range of S1 in FIG. 2B; hereinafter, also simply referred to as the upper portion S1). ) Is formed and is detachable near the water inlet 21a of the tank body 21 so as to pressurize and seal the tank body 21 and the water inlet 21a for storing the injected cooling water L together with the air reservoir above it. And a known tank cap 22.

  An upper tank portion 12a of the radiator 12 (return side of the cooling water) is provided at a lower portion of one end in the horizontal direction which is the longitudinal direction of the tank body 21 (range of S2 in FIG. 2B; hereinafter, also simply referred to as the lower portion S2). ) And a cylindrical first communication pipe portion 23 connected in parallel to each other at a predetermined distance from the first communication pipe portion 23, and a water pump 15 on the cooling water supply side to the engine 11. The second communication pipe portion 24 (see FIG. 3A) connected to the suction side by pipes is fixed integrally with the tank main body 21, and is in the first communication pipe portion 23 and the second communication pipe portion 24. The communication passages 23 a and 24 a are opened in the lower part S <b> 2 of the tank body 21, particularly at a position close to the inner bottom surface 21 b of the tank body 21.

  Further, the tank body 21 has a bulging portion 25 that bulges in a direction away from the lower portion S2 on the one end side in the horizontal direction at the lower portion on the other end side in the horizontal direction (right end side in FIG. 2A). Yes. The height from the inner bottom surface 21b of the tank body 21 to the upper inner surface 25h of the bulging portion 25 is the allowable range of the liquid level height when the cooling water L is poured from the inner bottom surface 21b of the tank body 21, that is, 2 (b) above the range from the LOW level to the FULL level (further above the FULL level, which is the highest allowable liquid level), and from the radiator 12 side during the operation of the engine 11. It is set to be slightly lower than the liquid level B when rising due to the return of the cooling water.

  Further, as shown in FIG. 2 (a), the inner width d2 (minimum inner diameter) of the upper part S1 of the tank body 21 in the horizontal direction is larger than the inner diameter d1 of the water injection port 21a. As shown, when the height of the lower part S2 of the tank body 21 is the height from the inner bottom surface 21b of the tank body 21 to the inner surface 25h on the upper side of the bulging part 25, the volume of the upper part S1 of the tank body 21 that exceeds the height Is substantially equal to or slightly larger than the volume in the bulging portion 25 bulged in the bulging region S3 outside the range corresponding to the horizontal cross-sectional area.

  The tank main body 21 protrudes upward from the inner bottom surface 21b of the tank main body 21 and extends in the left-right direction from one horizontal end (the left end in FIG. 2B) toward the other horizontal end. A partition wall portion 26 is provided, and by this partition wall portion 26, the inside of the tank body 21 communicates with the radiator 12 storage chamber 27 through the first communication pipe portion 23 to the upper tank portion 12 a side of the radiator 12, and the radiator 12. It is divided and divided into an engine side storage chamber 28 that communicates with the cooling water supply passage 14a from the lower tank portion 12b to the engine 11 side. The radiator-side storage chamber 27 and the engine-side storage chamber 28 are a plurality of storage chambers that are adjacent to each other in the front-rear direction of the vehicle in the tank body 21.

  As shown in FIG. 2B, the partition wall 26 has a through-hole 26h (communication hole) in the bulging portion 25, and the radiator-side storage chamber 27 and the engine-side storage chamber 28 pass through this through-hole 26h. The holes 26h communicate with each other in the bulging portion 25, which is the lower portion of the tank body 21. The partition wall portion 26 may be formed with a communication hole instead of the through-hole 26 h between the end portion of the bulging portion 25 away from the innermost portion 25 e and the inner wall surface of the bulging portion 25.

  The partition wall portion 26 is further formed with a communication hole 26j for air communication that allows the radiator-side storage chamber 27 and the engine-side storage chamber 28 to communicate with each other in the upper part S1 of the tank main body 21, and the radiator-side storage chamber 27 and the engine. An air reservoir having the same pressure is formed on the upper side of the side storage chamber 28.

  Note that the upper end portion 26g of the partition wall portion 26 in the vicinity of the water injection port 21a has a cooling water L injected from the water injection port 21a in the radiator side storage chamber 27 and the engine side storage chamber 28 as shown in FIG. It has an inclined and curved shape so as to be introduced on either side. However, the vicinity of the water injection port 21a of the partition wall portion 26 is cut out to introduce the cooling water L injected from the water injection port 21a into both the radiator-side storage chamber 27 and the engine-side storage chamber 28, and the air circulation communication hole. A hole in place of 26j may be formed so that the vicinity of the water inlet 21a is widely opened.

  Next, the operation will be described.

  In the reserve tank 20 of the present embodiment configured as described above, a sufficient coolant storage amount is secured on the lower S2 side of the tank main body 21 by the bulging portion 25, and the radiator-side storage chamber in the upper S1 of the tank main body 21. 27 and the engine side storage chamber 28 communicate with each other through the air circulation communication hole 26j. Therefore, even if the overall height of the reserve tank 20 is suppressed, uniform pressure is applied to the upper portions of the radiator side storage chamber 27 and the engine side storage chamber 28. The required amount of air pool can be formed, and the return of the cooling water L from the radiator 12 during the operation of the engine 11 can be reliably absorbed.

  Further, when the engine 11 is operated, acceleration toward the other end in the horizontal direction, that is, lateral acceleration acts, and the liquid level B of the cooling water L stored in the reserve tank 20 is indicated by a two-dot chain line in FIG. As shown, the liquid level B ′ is restricted to the upper part S1 having a smaller horizontal cross-sectional area than the lower part S2 side of the reserve tank 20 even when inclined to one end side in the horizontal direction. The lower part of one end in the horizontal direction connected to the return side and the supply side of the first pipe, that is, the communication passages 23a and 24a (opening portions) of the first communication pipe part 23 and the second communication pipe part 24 are exposed on the liquid surface. It is not done, and the arrangement state in the liquid can be maintained.

  Further, since the through-hole 26h that allows the radiator-side storage chamber 27 and the engine-side storage chamber 28 to communicate with each other is located in the bulging portion 25, the bubble-containing cooling water L that enters the radiator-side storage chamber 27 immediately passes through the engine side. The cooling water L is not supplied to the engine side after entering the storage chamber 28, and the cooling water L after the bubbles have escaped into the air reservoir is supplied to the engine side.

  In addition, piping connection to the radiator 12 side and the engine 11 side is made at the lower portion S2 on one end side in the horizontal direction of the tank body 21, and the liquid level B of the cooling water L is also kept low, so that an increase in the internal pressure of the radiator 12 is also suppressed. be able to.

  In addition, since the inner width d2 of the upper part S1 of the tank body 21 is larger than the inner diameter d1 of the water injection port 21a, the water injection workability is improved.

  As described above, in the present embodiment, the first communication pipe portion 23 and the second communication pipe portion 24 are disposed in the lower end S2 on the one end side of the reserve tank 20, and the bulging portion 25 is provided in the lower portion on the other end side to increase the tank height. The first communication pipe 23 and the second communication pipe 23 connected to the radiator 12 side and the engine 11 side are connected even when a traveling state such as cornering in which a large lateral acceleration acts on the vehicle is kept relatively long. Cooling water supplied from the reserve tank 20 to the engine 11 side can be reliably maintained while maintaining the in-liquid arrangement state of the passage opening portion of the communication pipe portion 24, and can suppress an increase in the internal pressure of the radiator 12. Cavitation occurs in the water pump 15 due to air bubbles mixed into the water, and the cooling performance of the engine 11 is thus reduced. It is possible to prevent. As a result, even if the tank height is suppressed, a low-cost reserve tank that can reliably prevent air from being mixed into the cooling water L to the engine 11 side under traveling conditions in which a large acceleration acts. 20 can be provided.

  In the above-described embodiment, the first communication pipe portion 23 and the second communication pipe portion 24 are arranged in parallel to the lower portion S2 on one end side in the horizontal direction of the tank main body 21 and are integrated with the tank main body 21. However, as long as it opens to the radiator-side storage chamber 27 and the engine-side storage chamber 28 in the lower part S2 on the one end side in the horizontal direction of the tank body 21, the piping path may not be parallel and bend in the vertical direction. You may do it. Further, the direction away from the lower portion on one end side in the horizontal direction that is the bulging direction of the bulging portion 25 is not only the direction from one end side to the other end side in the horizontal direction, but also the substantially horizontal direction intersecting therewith. Good.

(Second Embodiment)
FIG. 4 shows a second embodiment of the reserve tank of the present invention.
The present embodiment is similar to the first embodiment except that the shape of the partition wall in the reserve tank is different from the first embodiment described above. 4, the same components as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals as the corresponding components in FIG. 1, and differences will be described below.

  As shown in FIG. 4, in the reserve tank 30 of the present embodiment, the tank body 31 that stores the cooling water L together with the air reservoir above it has its longitudinal direction (horizontal direction) directed in the vehicle left-right direction (horizontal direction). A water injection port 31a (injection port) for injecting cooling water L is formed in the upper part of the tank body 31, and a tank cap 32 for pressurizing and sealing the water injection port 31a is detachably attached. ing.

  Further, a first communication pipe portion 33 and a second communication pipe portion 34 connected to the upper tank portion 12a side and the engine 11 side of the radiator 12 are respectively connected to the lower portion S2 on one end side in the longitudinal direction of the tank main body 31. 31 is mounted integrally and spaced apart from each other in parallel.

  Further, the tank body 31 has a bulging portion 35 bulging in a direction away from the lower portion on the longitudinal end side at the lower portion on the other end side in the longitudinal direction. A sufficient coolant storage amount is secured in the lower portion of 31.

  On the other hand, the tank body 31 protrudes upward from the inner bottom surface 31b of the tank body 31 and extends in the left-right direction from one horizontal end (the left end in FIG. 4A) toward the other horizontal end. A plurality of, for example, three partition walls 36A, 36B, and 36C are provided. By these partition walls 36A to 36C, the inside of the tank body 31 passes through the first communication pipe portion 33 and is located on the upper tank portion 12a side of the radiator 12. Is divided and divided into a radiator side storage chamber 37 that communicates with the engine 11 and an engine side storage chamber 38 that communicates with the cooling water supply passage 14a from the lower tank portion 12b of the radiator 12 to the engine 11 side through the second communication pipe portion 34. . The radiator-side storage chamber 37 and the engine-side storage chamber 38 are a plurality of storage chambers that are adjacent to each other in the front-rear direction of the vehicle in the tank body 31.

  Here, the partition walls 36A and 36C are separated from the innermost wall surface of the bulging portion 35, and the partition wall portion 36B located between both partition walls 36A and 36C is the inner wall surface on one end side in the longitudinal direction of the tank body 31. The partition walls 36A to 36C form a through hole 36h (communication hole) folded back in a U shape in the bulged portion 35. Further, the radiator side storage chamber 37 and the engine side storage chamber 38 communicate with each other in the bulging portion 35 which is the lower portion of the tank body 31 through the through hole 36h. The partition portions 36A to 36C (only the partition portions 36A and 36C may be provided) are further provided with communication holes 36j for air circulation that allow the radiator side storage chamber 37 and the engine side storage chamber 38 to communicate with each other in the upper part S1 of the tank body 31. Each is formed, and an air reservoir having the same pressure is formed on the upper side of the radiator side storage chamber 37 and the engine side storage chamber 38.

  Note that, in the upper end side of the partition wall portion 36, the vicinity of the water injection port 31a may be cut out, or the cutout may be integrated with the communication hole 36j.

  Also in the present embodiment, the first communication pipe portion 33 and the second communication pipe portion 34 are disposed in the lower end S2 on the one end side of the reserve tank 30, and the bulging portion 35 is provided in the lower portion on the other end side to suppress the tank height. Therefore, even when a traveling state such as cornering in which a large lateral acceleration acts on the vehicle continues for a relatively long time, the first communication pipe portion 33 and the second communication pipe connected to the radiator 12 side and the engine 11 side are connected. The liquid arrangement state of the passage opening portion of the pipe portion 34 can be reliably maintained, and an increase in the internal pressure of the radiator 12 can be suppressed, and the coolant supplied from the reserve tank 30 to the engine 11 side can be reduced. Cavitation occurs in the water pump 15 due to the mixing of air bubbles, and the cooling performance of the engine 11 is thus reduced. Door is prevented. As a result, the same effect as that of the first embodiment can be expected.

  Moreover, in this embodiment, since the long flow path including the through-hole 36h is set between the opening part in the tank of the 1st communicating pipe part 33 and the 2nd communicating pipe part 34 by several partition part 36A-36C. Further, it is possible to more reliably prevent bubbles from being mixed into the cooling water L to the engine 11 side.

  As described above, the present invention secures a sufficient amount of coolant to be stored in the lower portion of the tank by the bulging portion, thereby forming a required air reservoir even if the tank height is suppressed, and in addition, a reserve tank during operation. Even if the cooling liquid level in the inside is inclined, the liquid level is restricted to the upper part S1 having a smaller horizontal cross-sectional area than the lower part of the reserve tank, so that the lower part on the one end side in the horizontal direction connected to the radiator side by piping. Can be maintained in the liquid without exposing the liquid to the liquid surface, and further increase in the internal pressure of the radiator can be suppressed. It is useful for cooling devices, especially for closed-type reserve tanks and engine cooling devices that form an air reservoir whose volume changes in response to changes in the coolant level above the coolant. That.

It is the system block diagram which shows 1st Embodiment of the engine cooling device provided with the reserve tank of this invention. (A) is a front view of the reserve tank which concerns on 1st Embodiment, (b) is front sectional drawing of the reserve tank which concerns on 1st Embodiment. (A) is the III-III sectional view of FIG. 2, (b) is the IV-IV sectional view of FIG. It is a figure which shows 2nd Embodiment of the reserve tank of this invention, (a) is a plane sectional view of the reserve tank, (b) is a front sectional view of the reserve tank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine cooling device 11 Engine 11a Cooling water inlet 11b Cooling water outlet 11w Cooling passage 12 Radiator 12a Upper tank part (upper tank)
12b Lower tank (lower tank)
12c Water injection port 13 Upper hose 14 Lower hose 14a Cooling water supply passage 15 Water pump 16 Thermostat 17 Pressurized / sealed radiator cap 19 Car side heater 20, 30 Reserve tank 21, 31 Tank body 21a, 31a Water injection port (inlet)
21b, 31b Inner bottom surface 22, 32 Tank cap 23, 33 First communication pipe part 24, 34 Second communication pipe part 25, 35 Swelling part 25h Inner surface 26, 36A, 36B, 36C Partition part 26h, 36h Through hole (cooling) Water communication hole)
26j, 36j communication hole (communication hole for air flow)
27, 37 Radiator side storage chamber (storage chamber)
28, 38 Engine side storage chamber (storage chamber)
d1 Inner diameter of water inlet d2 Inner width of upper part of tank body L Cooling water (coolant)
S1 Upper part of tank body S2 Lower part of tank body S3 Swelling area

Claims (8)

A pipe is connected to the radiator side at the lower part at one end in the horizontal direction, and an inlet for injecting a cooling liquid is formed at the upper part. The tank body for storing the cooling liquid together with an air reservoir thereabove and the inlet are sealed. In a closed reserve tank with a cap,
The reserve tank according to claim 1, wherein the tank body has a bulging portion that bulges at a lower portion on the other end side in the horizontal direction and in a direction away from the lower portion on the one end side in the horizontal direction. A tank that is connected to the return side and the supply side of the coolant of the radiator at the lower part of one end in the horizontal direction and has an inlet for injecting the coolant at the upper part, and stores the coolant together with an air reservoir above it. In a closed type reserve tank comprising a main body and a cap for sealing the inlet,
The tank body protrudes upward from an inner bottom surface of the tank body, and a bulge portion that bulges in a direction away from the lower part on the one end side in the horizontal direction at the lower part on the other side in the horizontal direction of the tank body A partition wall section extending from one horizontal end side to the other horizontal end side and dividing the inside of the tank body into a plurality of storage chambers communicating with the coolant return side and the supply side passage of the radiator. ,
A reserve tank, wherein a communication hole is formed in the partition wall so as to communicate the plurality of storage chambers in the bulging portion.   The reserve tank according to claim 2, wherein a communication hole for air circulation is formed in the partition wall to communicate the plurality of storage chambers in an upper portion of the tank main body.   The reserve tank according to any one of claims 1 to 3, wherein the reserve tank is mounted on the vehicle with both ends in the horizontal direction facing in the left-right direction of the vehicle.   The reserve tank according to any one of claims 1 to 4, wherein an inner width of the upper portion of the tank body in the horizontal direction is larger than an inner diameter of the injection port.   The inner surface height of the bulging portion from the inner bottom surface of the tank body is located above an allowable range of the liquid surface height at the time of pouring the coolant from the inner bottom surface of the tank body. Item 6. The reserve tank according to any one of Items 1 to 5. The reserve tank according to any one of claims 1 to 6,
The radiator;
An engine cooling apparatus comprising: a water pump that circulates the coolant through the engine and the radiator.   8. The engine cooling device according to claim 7, wherein the reserve tank is mounted on a vehicle on which the engine is mounted with the horizontal one end and the other end facing left and right.

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