JP6613042B2 - Cooling water distribution device for internal combustion engine - Google Patents

Description

  The present invention relates to a cooling water distributor arranged in a cylinder head of an internal combustion engine.

  Cooling water is generally used as a cooling means in an internal combustion engine for a vehicle. A distribution device is disposed on one end face of a cylinder head, and water is sent to and received from various parts such as a radiator and a heater core, and a water pump. We are returning to

  As an example, in Patent Document 1, the distribution device (water outlet) is manufactured as a housing separate from the cylinder head, and the radiator is formed on the outer surface of the distribution device facing the crank axis direction. A feed port and return port to the heater core, a feed port and return port to the heater core, a feed port and return port to the oil cooler, etc. Is provided.

  Furthermore, a part of the distribution device of Patent Document 1 is overlapped and fixed to one end surface of the cylinder head, and a part protrudes from the cylinder head in a direction perpendicular to the crank axis. A water supply port (cooling water inflow passage) for returning the cooling water to the water pump is formed to open toward the cylinder head.

  Therefore, in brief, when the distributor and the cylinder head are viewed from the crank axis direction, a feed port and a return port to the radiator are provided on the front surface of the distributor, and the throttle body is connected to the outer peripheral surface of the distributor. A water supply port and a return port are provided, and a water supply port to the water pump is provided on the rear surface (back surface) of the distributor.

JP 2013-108429 A

  According to the configuration of Patent Document 1, since the distribution device is separate from the cylinder head, various types of distribution devices can be prepared according to the specifications of the internal combustion engine without changing the structure of the cylinder head. There is an advantage that the cost as a whole can be suppressed when arranging the internal combustion engines. Further, since the structure of the cylinder head is simplified, there is an advantage that the casting cost can be reduced accordingly.

  However, in Patent Document 1, since the water supply port to the water pump faces the cylinder head side, the distribution device must have a portion that protrudes from the cylinder head. . In addition, when the water supply port to the water pump is close to the cylinder head, there is a high possibility that work such as connecting a hose becomes troublesome.

  Moreover, when all the feed ports and the return ports are provided in one member as in Patent Document 1, the structure of the internal passage is complicated, and it takes time for casting, and the smooth flow of the cooling water is impaired. There is also a concern that

  The present invention aims to improve such a current situation.

The present invention is directed to “a cooling water distributor disposed on one end face of the cylinder head facing the crank axis direction”, and the configuration is specified in claims 1 and 2 .

Of these, the distribution device according to the invention of claim 1 is:
“A first spacer-like member that overlaps one end surface of the cylinder head, and a second member that overlaps the outer surface of the first member facing the crank axis direction,
On the outer peripheral surface of the first member, a radiator feed port for feeding water to the radiator and a main feed port for sending cooling water to the water pump are formed,
At least a radiator return port through which cooling water flows through the radiator is formed on the surface of the second member facing the crank axis direction. ''
In the basic configuration
“A return cooling water chamber communicating with the radiator return port and the main feed port and a feed cooling water chamber communicating with the radiator feed port are partitioned by a rib-like partition wall, and a part of the partition wall is cut away. A bypass passage is formed, and the cooling water returned from the radiator return port is set so as to hit the partition wall. ''
It is the composition.

The distribution device according to the invention of claim 2
“On the outer peripheral surface viewed from the crankshaft direction, a radiator feed port for feeding water to the radiator and a main feed port for sending cooling water to the water pump are formed,
On the outer surface facing the crank axis direction, at least a radiator return port is formed through which cooling water flows through the radiator. ''
In the basic configuration
“ A return cooling water chamber communicating with the radiator return port and the main feed port and a feed cooling water chamber communicating with the radiator feed port are partitioned by a rib-like partition wall, and a part of the partition wall is cut away. A bypass passage is formed, and the cooling water returned from the radiator return port is set so as to hit the partition wall. ''
It is the composition.

In the first aspect of the present invention, since the distribution device is composed of two members, the first member and the second member, the flow path can be easily designed, and the smooth flow of the cooling water can be easily realized. become. In addition, manufacturing is also easy (manufacturing by die-casting is also possible). Furthermore, if there are multiple types of cylinder heads with different coolant outlet positions and shapes, the design of the cylinder head can be changed because only the first member can be designed to fit the second member. It also has excellent compatibility with the above. Therefore, versatility is high.

In any of the inventions, since the radiator feed port and the main feed port are formed on the outer periphery of the distribution device, no matter how the distribution device is fixed to the cylinder head, the radiator feed port and the main feed port are connected to each other. Pipes can be connected without problems. Therefore, it is excellent in versatility also in this aspect. In addition, since the outside of the outer periphery of the distribution device is usually an open space, pipes and hoses can be easily connected to the radiator feed port and the main feed port.

Furthermore, the radiator return port and the main feed port have a large diameter because a large amount of cooling water flows. However, since the radiator return port and the main feed port having a large diameter are formed on the outer peripheral surface of the distributor, the distribution device Of these, the surface (front surface) facing in the crank axis direction can be widely used as a space for providing other feed ports and return ports. Therefore, it is possible to improve the freedom of design of the various feed port and the return port of a result, Ru can be easily realized easily structure the work of connecting the hoses.

In both claims, the area of the bypass passage can be adjusted by adjusting the notch amount of the partition wall, so that it can easily cope with other types of internal combustion engines having different requirements regarding the cooling function. Therefore, it is excellent in versatility.

  In addition, the cooling water returned from the radiator and cooled down is applied to the partition wall, so that the flow speed of the returning cooling water from the radiator is reduced and the flow direction is changed. There is an advantage that it is possible to prevent flow back into the water chamber and to accurately control the flow by the thermostat. That is, the partition wall performs a rectifying action, and therefore it is possible to easily guide the cooling water returned from the radiator to the main feed port smoothly.

In the first aspect of the present invention , since the feed cooling water chamber and the return cooling water chamber are formed on the mating surfaces of the first member and the second member, when the first member and the second member are viewed as a single unit, they are separated. The wall is exposed at the opening. Therefore, whether it is manufactured by casting or die-casting (or injection molding), it is easy to manufacture, and the size of the bypass passage can be easily adjusted by post-processing. .

Further, in the case of claim 1, since the radiator return port is provided in the first member, it is set so that the returned cooling water hits the partition wall provided in the first member. In this case, it is particularly preferable to configure a buffer chamber having a certain extent in front of the partition wall because the flow rate of the cooling water can be reduced.

It is a separation top view of an embodiment. It is a separation front view of an embodiment. It is a separation side view of an embodiment. (A) is a rear view of a 1st member, (B) is a BB view side view of (A). (A) is a top view of a 1st member, (B) is a top view of a thermo valve chamber cap, (C) is a side view of a thermo valve chamber cap. (A) is a rear view of a 2nd member, (B) is a perspective view from the back direction of a 1st member. FIG. 7 is an overall cross-sectional view taken along the line VII-VII in FIG. It is a bottom view of a thermo valve chamber cap.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, front / rear / left / right / upper / lower words are used to specify the direction, but the front / rear direction is the crank axis direction (or the axial direction of the camshaft), and the front is the front toward the cylinder head C. The side facing the cylinder head C is defined as the rear. The front view is the direction facing the cylinder head C along the crank axis direction, and the rear view is the opposite direction.

  The left-right direction refers to a direction orthogonal to the cylinder axis when viewed from the crank axis direction, and the up-down direction refers to the cylinder axis direction. With the cylinder head as a reference, the side on which the cylinder head cover is mounted is the upper side, and the cylinder block side is the lower side. Except for FIG. 7, the parallel oblique lines indicate a flat surface. The parallel diagonal lines in FIG. 7 are cross-sectional representations.

(1). Outline and First Member As shown in FIG. 1, for example, the distributor includes a first member 1 that overlaps one end surface C ′ of the cylinder head C, and a second member 2 that overlaps the front surface 1 a of the first member 1. These are both fastened to the cylinder head C by a plurality of stud bolts 3a and nuts 3b (see FIG. 7) arranged in the outer circumferential direction. An insertion hole of the stud bolt 3 a is indicated by reference numeral 4.

The first member 1 and the second member 2 are generally in the form of a horizontally long block, and the first member 1 forms a spacer that is sandwiched between the cylinder head C and the second member 2. As shown in FIGS. 2 (A) and 4 (A), the first member 1 has a circular cooling water inlet 5 opened rearward toward the cylinder head C. Although not shown, a cooling water outlet that overlaps with the cooling water inlet 5 in a front view is opened at one end face C ′ of the cylinder head C.

As shown in FIG. 2, the first member 1 includes a feed cooling water chamber rear portion 6 communicating with the cooling water inlet 5 and a return cooling water chamber rear portion 8 separated from the feed cooling water chamber rear portion 6 with a partition wall rear portion 7 therebetween. However, it is formed so as to open toward the second member 2. Most of the rear portion 6 of the feed cooling water chamber overlaps the cooling water inlet 5 in front view. For example, as shown in FIG. 1, the cooling water inlet 5 is close to one side edge 1 b of the left and right side edges of the first member 1, but the feed cooling water chamber rear portion 6 is, for example, FIG. As shown in FIG. 5, the horizontal portion 6 a is long in the left-right direction, and has a laterally-facing portion 6 a that enters in a slightly upward posture toward the other side edge 1 c from the cooling water inlet 5.

As shown in FIG. 2 (A), a water temperature sensor 9 exposed to the lateral portion 6a of the feed cooling water chamber rear portion 6 is attached to the upper portion of the other side edge 1c of the first member 1. The water temperature sensor 9 is inclined so that the tip is lowered in plan view.

As shown in FIG. 2, the return cooling water chamber rear portion 8 of the first member 1 is located on the side of the other side edge 1 c and is partitioned by the partition rear portion 7. Accordingly, the laterally facing portion 6a of the feed cooling water chamber rear portion 6 and the return cooling water chamber rear portion 8 are roughly divided vertically by the partition rear portion 7. The partition rear portion 7 is composed of a horizontal portion 7a, and a lower inclined portion 7b and an upper inclined portion 7c continuous to the horizontal portion 7a, and the height of the partition rear portion 7 is generally directed toward the other side edge 1c of the first member 1. It is in an inclined posture where the height becomes higher.

And while about half of the entire horizontal-like portion 7a of the lower inclined portion 7b is made flush with the front surface 1a of the first member 1, and is about half of the entire horizontal-like portion 7a of the upper inclined portion 7c, The recess 10 is recessed backward (see also FIG. 7). And the location of this recessed part 10 is the bypass channel | path 11. FIG. The bypass passage 11 is for returning a part of the cooling water to the water pump when the cooling water is not flowing to the radiator.

  The first member 1 is formed with a radiator feed port 12 that communicates with the lateral portion 6 a of the rear portion 6 of the feed cooling water chamber and opens upward. As shown in FIG. 1, the radiator feed port 12 is basically circular, and a thermo valve chamber cap 13 is fixed to the upper surface with bolts (not shown). Accordingly, the thermo valve chamber cap 13 is formed with a bolt insertion hole 14 on the opposite side of the shaft center, and a tap hole 15 is formed on the upper surface of the radiator feed port 12.

  A thermo valve device (not shown) is disposed in a radiator feed chamber constituted by the thermo valve chamber cap 13 and the radiator feed port 12, and the feed of the cooling water is controlled according to the temperature of the cooling water. The thermo-valve chamber cap 13 basically has a dome shape, and a water pipe 16 that connects a hose projects forward.

As can be understood from FIGS. 2 and 4, the first member 1 is formed with a main feed port 18 that communicates with the rear portion 8 of the return cooling water chamber and opens toward the other side edge 1 c. The main feed port 18 has a cylindrical shape and projects to the left and right outer sides, and is provided with a flange 19 at the tip. A flange provided on a pipe for connecting to the water pump is fixed to the flange 19. As shown in FIGS. 1 and 5A, the main feed port 18 is arranged close to the longitudinal side surface C ″ of the cylinder head C.

  In the present embodiment, the EGR passage 20 is formed in the first member 1. The EGR passage 20 is formed in the lower part of the first member 1, and both left and right ends protrude from the main body of the first member 1, and flanges 21 and 22 are formed on both left and right ends. The EGR passage 20 is inclined when viewed from the front, and the EGR gas flows from the lower side to the higher side. The flange 21 on the inlet side is flush with the flange 19 of the main feed port 18.

  Now, in an internal combustion engine, exhaust gas is recirculated to the intake system. However, as a means for guiding the exhaust gas to the intake system, a dedicated pipe is used, or an EGR passage is formed at the end of the cylinder head. doing. However, when a dedicated pipe is used, there is a problem that the cost is increased and a long pipe is easily deformed by vibration. When the pipe is formed on the cylinder head, the structure of the cylinder head is complicated. On the other hand, when the EGR passage 20 is formed in the distribution device as in this embodiment, the structure of the entire internal combustion engine can be simplified. Moreover, in embodiment, there exists an advantage which can cool EGR gas with cooling water.

(2). Second member For example, as shown in FIG. 6, the second member 2 includes a feed cooling water chamber front portion 23 similar to the feed cooling water chamber rear portion 6 of the first member 1, and the first member 1. A return cooling water chamber rear portion 8 and a similar return cooling water chamber front portion 24 are formed. Accordingly, the front and rear feed cooling water chambers 6 and 23 are integrated to form a feed cooling water chamber, and the front and rear return cooling water chambers 8 and 24 are integrated to form a return cooling water chamber .

  As described above, the first member 1 and the second member 2 are fastened to the cylinder head C by the stud bolt 3a and the nut 3b shown in FIG. 7, but as can be understood from FIG. 6, the stud bolt 3a. Are arranged so as to surround the feed cooling water chambers 6 and 23, thereby maintaining a reliable sealing property.

  Further, below the return cooling water chambers 8 and 24, the second member 2 is fixed to the first member 1 with a headed bolt 3c (see FIG. 7) (therefore, the return cooling water in the first member 1). The bolt holes 4 'below the chambers 8, 24 are tapped holes). Accordingly, the sealing of the return cooling water chambers 8 and 24 is ensured while preventing the strength of the cylinder head C from being reduced and reducing the labor of processing.

As shown in FIG. 6A, the second member 2 is also formed with a partition front portion 25 that is integrated with the partition rear portion 7 and performs a partition function. The partition front portion 25 has the same front view shape as the partition rear portion 7 in view of its function, and has a horizontal portion 25a and upper and lower inclined portions 25b and 25c.

As can be understood from FIGS. 3 , 6 (A) and 7, the partition wall front portion 25 of the second member 2 is formed with a protrusion 26 that enters the recess 10 of the partition wall rear portion 7. By bypassing the recess 20, the bypass passage 11 is formed. Therefore, the area of the bypass passage 11 can be arbitrarily set by adjusting the protrusion length of the protrusion 26 and the depth of the recess 10.

The second member 2 has a large number of cooling water feed ports and return ports. That is, many water openings are formed. First, the feed port communicating with the feed cooling water chamber front portion 23 will be described. As shown in FIG. 1, an EGR cooler feed port 27, a heater core feed port 28, and an EGR valve feed port 29 are formed. The EGR cooler feed port 27 is located in the upper part of the second member 2, opens in the horizontal direction in the front view of FIG. 2, and greatly tilts to the right in the plan view of FIG. 1. The EGR cooler feed port 27 is for cooling the EGR gas. A joint 27 a for connecting a hose is connected to the EGR cooler feed port 27. A joint 29 a is also connected to the EGR valve feed port 29.

The heater core feed port 28 is provided at a lower portion of the second member 2 and slightly closer to the other side edge 2c , in a horizontal position in the front view of FIG. 2, and on the side of the other side edge 2c in the plan view of FIG. Slightly inclined. Needless to say, the heater core feed port 28 is for sending cooling water to the heater core for heating the vehicle interior.

  The pipe connected to the heater core feed port 28 can be branched toward the CVT warmer. In this case, it is appropriate to call the heater core feed port 28 a heater core and a CVT warmer feed port. If a CVT warmer is not required, only the heater core may be heated. Conversely, in the case of a vehicle that does not require a heater, the heater core feed port 28 can be changed to a CVT warmer feed port. When both are unnecessary, the heater core feed port 28 may be closed with a plug. A joint 28 a for connecting a hose is also connected to the heater core feed port 28.

The EGR valve feed port 29 opens toward the other side edge 2 c of the second member 2 . The EGR valve feed port 29 is for cooling the EGR valve that adjusts the flow rate of the EGR gas.

As shown in FIG. 6 (A), the return cooling water chamber front portion 24 has a radiator return port 30, a heater core return port 31, and an EGR cooler return port 32, all open to the front surface of the second member 2. It is formed to do. Among these, the radiator return port 30 is provided in the lower part near the one side edge 2b of the 2nd member 2 as FIG.2 and FIG.1, and faces diagonally outward in planar view and diagonally outward in front view. A joint 30 a for connecting a hose is also fitted to the radiator return port 30.

As can be understood from FIG. 6, the radiator return port 30 opens toward the partition front portion 25. And the protrusion 26 of the partition front part 25 is located on the extension line of the axial center of the radiator return port 30. In other words, the protrusion 26 of the partition wall front portion 25 exists in front of the traveling direction of the cooling water returned from the radiator. For this reason, the cooling water collides with the projecting portion 26, so that the flow is guided (rectified) in a U-turn shape as shown by an arrow 33 in FIGS. 1 and 6, and smoothly toward the main feeding port 18. Sent.

For this reason, even when the bypass passage 11 is provided at a location opposite to the partition walls 7 and 25, it is possible to prevent the cooling water having been cooled by the radiator from flowing into the cooling water chamber 6 (reversely flowing). As a result, both the Ru can be properly reflect the temperature of the detected temperature to the engine water temperature sensor 9, Semo valve can also be actuated state of being appropriately reflected in the temperature of the engine.

Further, the vicinity of the outlet of the radiator return port 30 in the return cooling water chamber front portion 24 is a buffer chamber having an enlarged volume. Therefore, it is possible to reduce the flow rate of the cooling water returning from the radiator return port 30. As a result, there is an advantage that the rectifying action by the protrusion 26 is accurately exhibited.

The heater core return port 31 is located almost directly above the radiator return port 30 and opens in the crank axis direction. A joint 31 a is also fitted to the heater core return port 31. The EGR cooler return port 32 is formed at the end opposite to the radiator return port 30 in the return cooling water chamber front portion 24, and as shown in FIGS. In plan view, the opening is slightly inclined toward the side edge 2a.

  The EGR cooler return port 32 is also provided with a joint 32a. The return line from the EGR valve is connected to, for example, the heater core return line, but a dedicated return port may be provided in the second member 2. As shown in FIGS. 6A and 7, an annular groove 34 surrounding the cooling water chambers 23, 24 is formed on the rear surface of the second member 2, and a packing (gasket) is fitted into the annular groove 34. Or filled with a liquid sealant.

(3) Summary In the present embodiment, the radiator feed port 12 and the main feed port 18 are provided in the first member 1, and the radiator feed port 12 faces upward and the main feed port 18 faces sideways. The connection work of the hose to the radiator feed port 12 and the main feed port 18 can be easily performed in a wide place.

  In addition, many return ports and feed ports such as the radiator return port 30 are provided at the front portion of the second member 2, but the second member 2 is formed by the radiator feed port 12, so that the second member 2 can be widely used as a formation area for the radiator return port 30 and the like. For this reason, it is easy to lay out many feed ports and return ports such as the radiator return port 30 so as not to interfere with each other when connecting hoses. That is, design freedom is high.

  In particular, the orientation of each feed port and return port is differentiated forward and diagonally upward and diagonally downward so that the direction of each feed port and return port extends over a wide range. As a result, it is possible to easily insert and remove hoses while miniaturizing the distribution device as much as possible.

  In the present embodiment, the radiator return port 30 is inclined obliquely downward. However, when this configuration is adopted, there is an advantage that piping to the radiator is simplified. In other words, the radiator has a structure in which the cooling water flows from the upper tank to the lower tank, so the return line of the cooling water rises from a location close to the bottom of the engine room and goes to the distributor. If the radiator return port 30 is inclined obliquely downward as in the form, the pipe from the bottom to the top can be connected to the radiator return port 30 in a natural state without being unnaturally bent. Can be made as short as possible, and can also contribute to a reduction in pressure loss by eliminating unnatural bending.

  The embodiment of the present invention has been described above, but the present invention can be embodied in various ways. For example, in the above-described embodiment, the distribution device is configured by the two members of the first member 1 and the second member 2, but may be configured by a single member or three members. is there. The forms of the feed cooling water chamber and the return cooling water chamber can also be appropriately changed according to the required functions. A thermo valve for controlling water flow to the radiator may be disposed at the radiator return port.

  The present invention can be actually embodied in a cooling water distributor for an internal combustion engine. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 1st member 2 2nd member 6 Feed cooling water chamber rear part 7 Partition rear part 8 Return cooling water chamber rear part 10 Recessed part of partition rear part 11 Bypass passage 12 Radiator feed port 13 Thermo valve chamber cap 18 Main feed port 20 EGR passage 23 Feed cooling Water chamber front portion 24 Return cooling water chamber front portion 25 Partition rear portion 26 Projection at rear portion of partition wall 27 EGR cooler feed port 28 Heater core feed port 29 EGR valve feed port 30 Radiator return port 31 Heater core return port 32 EGR cooler return port
C ″ Longitudinal side of cylinder head

Claims (2)

A cooling water distributor disposed on one end face of the cylinder head facing the crank axis direction,
A spacer-shaped first member that overlaps one end surface of the cylinder head, and a second member that overlaps the outer surface of the first member facing the crank axis direction.
On the outer peripheral surface of the first member, a radiator feed port for feeding water to the radiator and a main feed port for sending cooling water to the water pump are formed,
The surface facing the crank axis direction of the second member, at least, in the configuration cooling water through the radiator that is a radiator return port for flowing formation,
A return cooling water chamber that communicates with the radiator return port and the main feed port, and a feed cooling water chamber that communicates with the radiator feed port are partitioned by a rib-shaped partition, and a bypass is provided by cutting out a part of the partition. A passage is formed, and the cooling water returned from the radiator return port is set to hit the partition wall,
Cooling water distribution device for an internal combustion engine. A cooling water distributor arranged on one end face of the outer periphery of the cylinder head facing the crank axis direction,
On the outer peripheral surface seen from the crank axis direction, a radiator feed port for feeding water to the radiator and a main feed port for sending cooling water to the water pump are formed,
In the configuration in which at least a radiator return port into which cooling water flows through the radiator is formed on the outer surface facing the crank axis direction,
A return cooling water chamber that communicates with the radiator return port and the main feed port, and a feed cooling water chamber that communicates with the radiator feed port are partitioned by a rib-shaped partition, and a bypass is provided by cutting out a part of the partition. A passage is formed, and the cooling water returned from the radiator return port is set to hit the partition wall,
Cooling water distribution device for an internal combustion engine.

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