JP4890286B2 - Reserve tank and engine cooling device equipped with the same - Google Patents

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 is sealed with a pressure-sealing cap, an air reservoir is formed above the cooling water stored inside, and the cooling water ( There is a hermetically sealed type in which a change in the liquid level accompanying a change in temperature of the coolant is absorbed by a change in the volume of the air pool.

  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 supply path). 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 wall having a communication hole is provided at the lower end so as to divide the inside of the tank into a plurality of adjacent storage chambers, and a main air reservoir is formed in the storage chamber on one end side thereof. In this reserve tank, a communication hole on the radiator side for allowing cooling water to enter and exit from the radiator side is opened on the upper side of the tank, and a communication hole on the engine side for supplying cooling water to the engine side is provided. It opens to the tank lower side (for example, refer patent document 1).

  In addition, a plurality of partition walls having communication paths are provided between an inflow pipe on one end side and an outflow pipe on the other end side of the tank to form a plurality of storage chambers adjacent in the longitudinal direction (for example, Patent Document 2) 3), and a plurality of parallel partition walls provided in the tank and a plurality of adjacent storage chambers communicated with each other through communication holes formed on the lower end side and the upper end side thereof. There is one in which the cooling water and the air reservoir above it are stored at a liquid level (see, for example, Patent Document 4).

In addition, there is a bellows portion in the middle of the vertical direction of the tank body so that it can be compressed in the vertical direction, and it is arranged inside the fender of the vehicle with the longitudinal direction facing the vehicle longitudinal direction, In this reserve tank, the height of the front portion is lower than the height of the rear portion due to restrictions on the mounting height (see, for example, Patent Document 5).
JP-A-6-185358 JP 2005-120906 A Japanese Patent Laid-Open No. 6-146883 JP-A-5-209522 Japanese Utility Model Publication No. 4-66321

  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 is greatly inclined, and the communication hole on the engine side opened in the cooling water in the reserve tank may come out of the liquid level and lead to an air reservoir. In that case, since air is mixed into the cooling water supplied to the engine side through the communication hole portion on the engine side, the cooling performance is lowered.

  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 at the lower part on one side in the horizontal direction, and an inlet for injecting a cooling liquid is formed at the upper part. a tank body for storing together with a cap for sealing the inlet, the reservoir tank of the closed type equipped with the tank body, the lower portion of the horizontal one side at the bottom of the horizontal other side of the tank body A bulging portion that bulges in a separating direction, and projects upward from the inner bottom surface of the tank body, and is located on one side of the storage space on the one side in the horizontal direction and on the other side in the horizontal direction. A lower partition hole that partitions the first storage chamber and the second storage chamber on a lower side in the tank body. When Together form an upper communication hole for communicating the storage chamber of the one said a storage chamber side the other side in the upper portion of the tank body, said one side of the storage chamber at the bottom of the tank body, the while being divided into a pair of chambers with coolant return side of the radiator corresponding to the supply side, so that the pair of chambers communicates with the supply side and the return side of the cooling liquid of the radiator, the lower portion of the tank body A pair of communication holes corresponding to the pair of chambers are formed.

In this reserve tank, even if the coolant level in the reserve tank is inclined for a relatively long time during operation, the liquid level is limited to the upper part of the horizontal cross-sectional area narrower than the lower part of the reserve tank. The lower portion on one side in the horizontal direction connected by piping to the radiator side is not exposed on the liquid surface, and the in-liquid arrangement state of the lower portion on one side in the horizontal direction is maintained. Further, the partition wall portion also serves as a baffle plate, and can contribute to maintaining the liquid level height of the storage chamber on one side in the horizontal direction higher with respect to the liquid level inclination for a relatively short time. Furthermore, since the pipe connection to the radiator side is made at the lower part on one side in the horizontal direction of the tank body and the liquid level is also kept low, it is possible to suppress an increase in the internal pressure of the radiator. Moreover, by securing a sufficient amount of coolant storage in the lower part of the tank by the bulging part, even if the tank height is suppressed, an air pool with uniform pressure can be formed in a plurality of storage chambers. The required air reservoir can be formed in the upper part of the slab. In addition, the reserve tank can supply the coolant to the engine side while allowing the coolant to return from the radiator side. Incidentally, a direction away from the bottom of the horizontal one side, the not from one side of the horizontal direction only toward the other side, at the same or may be substantially horizontal direction crossing.

Reserve tank of the present invention, preferably, (2) projecting wall the dividing walls, which protrude toward the horizontal direction on one side of the storage chamber of the one side in the tank body so as to partition the pair of chambers And a lower communication hole that communicates the pair of chambers with the other storage chamber on the lower side in the tank body, and the pair of chambers and the other storage in the upper portion of the tank body. and it is characterized in that it has an upper communicating hole for communicating the chamber.

With this configuration, the pair of communication holes can be reliably disposed in the liquid, and air bubbles contained in the cooling liquid from the radiator side are prevented from entering the cooling liquid supplied to the engine side by the partition wall. can do.

In the reserve tank having the above configuration (1) or (2), (3) it is desirable that the reserve tank is mounted on the vehicle with the one side in the horizontal direction and the other side in the horizontal direction directed in the left-right direction of the vehicle.

This maintains the submerged arrangement of the lower part on one side in the horizontal direction that is connected to the radiator side or further to the engine side, even when the running state during cornering where a large lateral acceleration acts is relatively long. can do.

  In the reserve tank having any one of the configurations (1) to (3), it is preferable that (4) 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.

  Moreover, in the reserve tank which has a structure in any one of said (1)-(4), (5) The inner surface height of the said bulging part from the inner bottom face of the said tank main body is from the inner bottom face of the said tank main body. It is preferable to be positioned above the permissible range of the liquid level when the coolant is injected.

  Thereby, an air pocket can fully be formed. The height of the inner surface of the bulging portion can be positioned near or below the liquid level when the liquid level rises due to the return of the cooling liquid from the radiator side.

In the reserve tank having any one of the constitutions (1) to (5), (6) the injection port is arranged in the horizontal direction with respect to the partition wall so as to introduce the cooling liquid into the storage chamber on the other side. It may be formed on the other side .

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

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

The engine cooling apparatus having the configuration of the above (7) includes: (8) a vehicle on which the engine is mounted , wherein the reserve tank has one end portion and the other end portion in the longitudinal direction at one side in the horizontal direction and the other side in the horizontal direction. It is good to be equipped with the mounting | wearing state toward the left-right direction of the said vehicle.

With this configuration, even when the running state such as cornering in which a large lateral acceleration is applied continues for a relatively long time, the submerged arrangement state of the lower part on one side 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. The return of liquid can be absorbed reliably, and even if the cooling liquid level in the reserve tank is inclined, the liquid level is limited to the upper part where the horizontal sectional area is narrow compared to the lower part of the reserve tank, Moreover, by providing the partition wall with a baffle plate function, it is possible to reliably maintain the in-liquid arrangement state without exposing the lower part on one side in the horizontal direction connected to the radiator side by piping. Furthermore, piping connection to the radiator side is made at the lower part on one side in the horizontal direction, and the liquid level can be kept low, so that 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.
1 to 4 are views showing an embodiment of a reserve tank of the present invention and an engine cooling device provided with 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 12a on the return side of the cooling water L from the engine 11 and a lower tank portion 12b on the supply side of the cooling water L to the engine 11.

  The upper hose 13 and the lower hose 14 are connected to the cooling water inlet 11a and the cooling water outlet 11b of the engine 11 and the radiator 12 so that the cooling passage 11w in the engine 11 and the heat exchange passage (not shown in detail) in the radiator 12 communicate with each other. This is a pipe having heat resistance and pressure resistance for connecting the upper tank portion 12a and the lower tank portion 12b.

  The water pump 15 is built in the engine 11 so as to be rotated by the power from the engine 11, and the high-temperature cooling water L 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 L is circulated through a predetermined circulation path through which the water L is supplied to the engine 11 through the lower hose 14 or further from the engine 11 through the pipes 18a and 18b and the vehicle interior side heater 19 (heat exchanger for heater). It is like that. 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. Cooling water L (steam bubbles are supplied to the reserve tank 20 connected in the vicinity of the water injection port 12 c. (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 a part of the engine cooling device 1 in a mounted state in which the longitudinal direction is substantially horizontal and one end and the other end ( one end in the horizontal direction and the other end in the horizontal direction) are directed left and right. It is mounted on the vehicle in a state directed toward the left and right direction of the vehicle. 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 (cooling water) of the radiator 12 is provided at a lower portion of the tank body 21 at one end in the horizontal direction ( one side in the horizontal direction) (the range of S2 in FIG. 2B; hereinafter, also simply referred to as the lower portion S2). A cylindrical first communication pipe portion 23 piped to the return side) and a water pump which is spaced apart in parallel by a predetermined distance from the first communication pipe portion 23 and which is a cooling water supply side to the engine 11 15 are connected to the tank main body 21 integrally with the second communication pipe portion 24 (see FIG. 3) connected to the suction side of the first communication pipe portion 23 and the second communication pipe portion 24, respectively. The communication passages 23 a and 24 a are communication holes that are opened in the lower portion S <b> 2 of the tank main body 21, particularly at positions close to the inner bottom surface 21 b of the tank main body 21.

Further, the tank body 21 is a bulging portion that bulges in a direction away from the lower part S2 on one side in the horizontal direction at the lower part of the other end in the horizontal direction (the other side in the horizontal direction; the right end side in FIG. 2A). 25. 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 it rises due to the return of the cooling water L.

  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.

  Further, a partition wall portion 26 protruding upward from the inner bottom surface 21 b of the tank body 21 is provided in the tank body 21, and the tank body 21 is positioned on one side in the horizontal direction (left and right) by the partition wall portion 26. It is partitioned into a storage chamber 27 on one side and a storage chamber 28 on the other side located on the other side in the horizontal direction. The partition wall portion 26 further includes a protruding wall portion 26p that protrudes toward one end in the horizontal direction in the tank body 21 so as to partition the storage chamber 27 on one side into a pair of chambers 27a and 27b (see FIG. 3). ing. In the lower part S2 on one end side in the horizontal direction of the tank body 21, one chamber 27a communicates with the upper tank portion 12a side of the radiator 12 through the first communication pipe portion 23, and the other chamber 27b communicates with the lower tank portion 12b of the radiator 12. To the cooling water supply passage 14a from the engine 11 to the engine 11 side.

  The pair of chambers 27a and 27b of the storage chamber 27 on the one side are adjacent to each other in the front-rear direction of the vehicle in the tank main body 21, and the partition wall portion 26 has an inner space in the tank main body 21 as shown in FIGS. The pair of chambers 27a, 27b are connected so that the one storage chamber 27 and the other storage chamber 28 communicate with each other on the lower S2 side, and the pair of chambers 27a, 27b communicate with each other via the other storage chamber 28. Are respectively formed with a pair of lower communication holes 26a and 26b that communicate with the storage chamber 28 on the other side. The other storage chamber 28 is a coolant for the radiator 12 through the pair of chambers 27a, 27b of the storage chamber 27 on the one side and the communication passages 23a, 24a in the first communication pipe portion 23 and the second communication pipe portion 24. Communicates with the return side and the supply side.

  The partition wall portion 26 may be formed with communication holes in place of the lower communication holes 26a and 26b between the inner bottom surface 21b of the tank body 21 and the shapes of the lower communication holes 26a and 26b are circular or elliptical. , Rectangular or any other shape, and a plurality of them may be provided. However, the pair of lower communication holes 26a and 26b corresponding to the pair of chambers 27a and 27b are preferably close to both side walls of the tank body 21 so as to be separated from each other.

  Further, the partition wall portion 26 allows one side storage chamber 27 and the other side storage chamber 28 to communicate with each other in the upper part S 1 of the tank body 21, and the other side storage chamber 28 on the upper part S 1 side in the tank body 21. A pair of upper communication holes 26j and 26k are formed to communicate the pair of chambers 27a and 27b to the other storage chamber 28, respectively, so that the pair of chambers 27a and 27b communicate with each other. An air reservoir having the same pressure is formed on the upper side of the chamber 27 and the storage chamber 28 on the other side.

  In the present embodiment, the partition wall portion 26 in the vicinity of the water injection port 21a introduces the cooling water L injected from the water injection port 21a into the other storage chamber 28 as shown in FIG. 2B, for example. In addition, it is arranged so as to be positioned on the left side of the drawing, that is, on one end side in the horizontal direction from the water injection port 21a. It is good also as a shape introduced in 28. For example, the upper ends of the pair of chambers 27a and 27b of the storage chamber 27 on one side may be opened in the water injection port 21a, respectively, or the vicinity of the water injection port 21a of the partition wall portion 26 may be cut out to connect the upper communication for air circulation. Cutout holes may be formed in place of the holes 26j and 26k.

  Next, the operation will be described.

  In the reserve tank 20 of the present embodiment configured as described above, a sufficient amount of coolant is secured on the lower side S2 side of the tank body 21 by the bulging portion 25, and one side is stored on the upper side S1 of the tank body 21. Since the storage chamber 28 on the chamber 27 side and the storage chamber 28 on the other side communicate with each other through the upper communication holes 26j, 26k for air circulation, even if the overall height of the reserve tank 20 is suppressed, the storage chamber 27 on the one side and the storage on the other side are stored. An air reservoir having a required amount of uniform pressure can be formed in the upper portion of the chamber 28, and the return of the cooling water L from the radiator 12 side 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, for example, lateral acceleration acts, and the liquid level B of the cooling water L stored in the reserve tank 20 is indicated by, for example, a one-dot chain line in FIG. Thus, even if it inclines toward one end in the horizontal direction, the liquid level B ′ is limited to the upper portion S1 having a narrow horizontal cross-sectional area as compared with the lower portion S2 side of the reserve tank 20. In addition, the partition wall portion 26 functions as a baffle plate, and contributes to maintaining the liquid height B ′s of the storage chamber 27 on one side in the horizontal direction higher with respect to the liquid level inclination for a relatively short time. Become. Therefore, even when a traveling state such as cornering in which a large lateral acceleration is applied continues for a relatively long time, a lower portion on one end side in the horizontal direction connected to the return side and the supply side of the cooling water L of the radiator 12 respectively. That is, the communication passages 23a and 24a (opening portions of the communication holes) of the first communication pipe portion 23 and the second communication pipe portion 24 are not exposed on the liquid surface, and the arrangement state in the liquid can be reliably maintained. become.

  Further, the storage chamber 27 on one side is divided and divided into a pair of chambers 27 a and 27 b, and lower communication holes 26 a and 26 b that connect the pair of chambers 27 a and 27 b to the storage chamber 28 on the other side are formed in the partition wall portion 26. Therefore, the bubble-containing cooling water L from the radiator 12 side entering the one chamber 27a of the one storage chamber 27 enters the other chamber 27b as it is and is supplied to the engine side. Instead, the cooling water L is supplied to the engine side after the bubbles enter the storage chamber 28 on the other side from one chamber 27a and the air bubbles escape to the air reservoir. Therefore, cavitation occurs in the water pump 15 due to air bubbles mixed in the cooling water L supplied from the reserve tank 20 to the engine 11 side, and the cooling performance of the engine 11 is thus lowered. Even if the tank height is suppressed, it is possible to reliably prevent air from being mixed into the cooling water L to the engine 11 side under a traveling state in which a large acceleration acts.

  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. Therefore, it is not necessary to make the tank body 21 thick.

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

  Thus, in the present embodiment, by securing a sufficient amount of coolant storage in the lower portion S2 of the tank by the bulging portion 25, even if the tank height is suppressed, the storage chambers 27 on the one side and the other side, An air reservoir having a uniform pressure can be formed in 28, and a required amount of air reservoir can be formed in the upper part S1 of the tank body 21, and cooling from the radiator 12 side during operation of the engine 11 can be performed. The return of the water L can be absorbed reliably.

  Further, even if the coolant level in the reserve tank 20 is inclined during operation, the level is limited to the upper part S1 having a smaller horizontal cross-sectional area than the lower part of the tank body 21, and the baffle plate of the partition wall 26 is further reduced. Since the function is also added, it is possible to reliably maintain the in-liquid arrangement state of the communication passages 23a and 24a of the lower first communication pipe portion 23 and the second communication pipe portion 24 on the one end side in the horizontal direction. In the present embodiment, the reserve tank 20 is mounted on the vehicle with its both ends in the horizontal direction facing the left and right direction of the vehicle. For example, when the liquid level inclination becomes noticeable due to lateral acceleration, such as during circuit running. Can also respond sufficiently.

  Further, since the pipe 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 is also kept low, an increase in the internal pressure of the radiator 12 can be suppressed. A cost reserve tank 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, the piping path may not be parallel or may be curved in the vertical direction.

  In addition, one of the first communication pipe portion 23 and the second communication pipe portion 24, for example, the second communication pipe portion 24 can be directly opened to the bottom side of the storage chamber 28 on the other side. For example, the protruding wall portion 26p is not necessary, and the storage chamber 27 on one side does not need to be partitioned and divided into the pair of chambers 27a and 27b.

  As described above, the present invention ensures a sufficient amount of coolant stored in the lower portion of the tank by the bulging portion, thereby forming a required air reservoir even when the tank height is suppressed, thereby providing a radiator during engine operation. Even if the coolant level in the reserve tank is inclined, the liquid level can be absorbed in the upper part where the horizontal cross-sectional area is narrow compared to the lower part of the reserve tank. In addition, the baffle plate function is provided in the partition wall, so that the lower part of the horizontal one end connected to the radiator side is securely maintained without exposing the lower part on the liquid level. In addition, it is possible to keep the liquid level low by connecting the pipe to the radiator side at the lower part on one end side in the horizontal direction, and to suppress the rise in the internal pressure of the radiator. It is possible to provide a low-cost reserve tank that can reliably prevent air from being mixed into the coolant to the engine side under traveling conditions in which a large acceleration acts. This is useful for a reserve tank and an engine cooling device equipped with the tank, and particularly for a closed type reserve tank and an engine cooling device in general that form an air reservoir whose volume changes in accordance with the change of the coolant level above the coolant. is there.

It is the system configuration | structure figure which shows one Embodiment of the engine cooling device provided with the reserve tank of this invention. (A) is a front view of the reserve tank concerning one embodiment, (b) is a front sectional view of the reserve tank concerning one embodiment. It is the III-III sectional view of Drawing 2 (a). It is a plane sectional view of a reserve tank concerning one embodiment.

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 12b Lower tank part 13 Upper hose 14 Lower hose 15 Water pump 16 Thermostat 17 Pressurizing / sealing type radiator cap 18a, 18b Piping 19 cars Room heater 20 Reserve tank 21 Tank body 21a Water injection port (injection port)
21b Inner bottom surface 22 Tank cap 23 First communication pipe portion 23a, 24a Communication path (communication hole)
24 Second communication pipe part 25 Swelling part 25h Inner surface 26 Partition part 26a, 26b Lower communication hole 26j, 26k Upper communication hole 26p Projecting wall part 27 One side storage chamber 27a, 27b A pair of chambers 28 The other side 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 on one side in the horizontal direction, and an inlet for injecting cooling liquid is formed at the upper part. The tank main body for storing the cooling liquid together with an air reservoir thereabove and the inlet are sealed. A sealed reserve tank with a cap,
The tank body protrudes upward from an inner bottom surface of the tank body, and protrudes upward from an inner bottom surface of the tank body, at a lower portion on the other side in the horizontal direction of the tank body, and in a direction away from the lower portion on the one side in the horizontal direction. A partition that divides the main body into a storage chamber on one side positioned on one side in the horizontal direction and a storage chamber on the other side positioned on the other side in the horizontal direction;
The partition wall includes a lower communication hole that communicates the storage chamber on the one side and the storage chamber on the other side on the lower side in the tank body, the storage chamber on the one side in the upper part of the tank body, and the While forming an upper communication hole for communicating with the other storage chamber,
The storage chamber on the one side at the bottom of the tank body is partitioned into a pair of chambers corresponding to the return side and the supply side of the coolant of the radiator , and the pair of chambers is the return side of the coolant of the radiator A reserve tank, wherein a pair of communication holes corresponding to the pair of chambers are formed in a lower portion of the tank body so as to communicate with the supply side. The partition wall portion, and having a protruding wall portion protruding toward the horizontal direction on one side of the storage chamber of the one side in the tank body so as to partition the pair of chambers, the lower side in the tank body It has a lower communication hole for communicating the reservoir chamber of the other side to the pair of chambers, an upper communication hole for communicating the reservoir chamber of the other side to the pair of chambers in the upper portion of the tank body reserve tank according to claim 1, characterized in that there. 3. The reserve tank according to claim 1, wherein the reserve tank is mounted on the vehicle with the one side in the horizontal direction and the other side in the horizontal direction directed in a left-right direction of the vehicle.   The reserve tank according to any one of claims 1 to 3, 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 5. The reserve tank according to any one of Items 1 to 4.   The said injection port is formed in the said horizontal direction other side with respect to the said partition part so that the said cooling fluid may be introduce | transduced into the said other storage chamber, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. The reserve tank described. The reserve tank according to any one of claims 1 to 6,
The radiator;
An engine cooling device comprising: a water pump for circulating the coolant through the engine and the radiator. The vehicle equipped with the engine, the reserve tank is equipped with the mounted state with its one end and the other end in the longitudinal direction in the lateral direction of the vehicle to be the horizontal direction on one side and the horizontal other side The engine cooling device according to claim 7.

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