JP3438211B2 - Water pump for internal combustion engine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump for an internal combustion engine, and more particularly to a water pump having variable distribution of cooling water supplied to each part of the internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, regarding a water pump for an internal combustion engine, a system has been proposed for adjusting the ratio of the amount of cooling water supplied to a cylinder head and a cylinder block. For example, "Development of VQ engine variable dual system cooling system"
(Proceedings of 13th Internal Combustion Engine Symposium-65, 1996 7
(Tokyo, 9th to 11th of each month), an independent cooling water passage communicating with one water pump is connected to each of the cylinder head and the cylinder block, and the cylinder head and the cylinder block are circulated downstream of the cylinder head and the cylinder block, respectively. A converging pipe for merging the cooling water is installed, and a control valve for adjusting the cooling water flow rate to the cylinder block is arranged between the cylinder block and this converging pipe (downstream of the cylinder block). A system for adjusting the cooling water flow rate to the cylinder block has been proposed. This system adjusts the flow rate of cooling water to the cylinder block, and the cooling water is constantly supplied from the water pump to the cylinder head.

Further, Japanese Patent Laid-Open No. 4-237898 has a passage switching valve for the purpose of appropriately distributing the flow rate of cooling water to each part of the engine (cylinder head and cylinder block) to enhance cooling performance. A water pump for an internal combustion engine has been proposed. FIG. 11 is a cross-sectional view for explaining the structure of this water pump. Referring to FIG. 11, in this water pump 100, the boundary wall 105 between the cylinder head side discharge passage 101 and the cylinder block side discharge passage 102 is a passage 1 for the cooling water sent from the rotor 106.
09, and the pivot 103 at the tip of this boundary wall 105
The control vane 104 is pivotally supported on the control vane 104 and the control vane 104 is pivoted to control the opening area ratio between the cylinder head side discharge passage 101 and the cylinder block side discharge passage 102. Due to the structure of the control blades 104, the water pump 100 cannot take a so-called fully closed state in which cooling water is not supplied to the cylinder head and the cylinder block, as shown in the figure.

Further, a cooling device and a water pump for an internal combustion engine, which uses an electric motor as a drive source in place of the internal combustion engine and changes the distribution of cooling water supplied to each part of the internal combustion engine by switching its discharge passage, It is proposed in JP-A-57-159916 and JP-A-8-142647, respectively. In the cooling device proposed in JP-A-57-159916,
The discharge passage of a water pump driven by an electric motor is connected to the cylinder block and the cylinder head via a control valve, and the control valve distributes the cooling water supplied to the cylinder block and the cylinder head according to the temperature of the internal combustion engine. It is variable. Further, the water pump proposed in Japanese Patent Laid-Open No. 8-142647 includes a radiator discharge port, an oil cooler discharge port, and a heater discharge port, and a vortex chamber provided so as to surround the rotor concentrically with the rotor. The rotating body that it has is rotated and the discharge port through which the cooling water is discharged is selected.

[0005]

In the system of the above-mentioned lecture paper "Development of VQ engine variable two-system cooling system", the control valve is arranged on the downstream side of the cylinder block, and the flow rate control means is arranged on the upstream side of the cylinder head. Since they are not arranged, it is impossible to realize a state in which the cooling water is not supplied to either the cylinder head or the cylinder block. Therefore, the flow rate of the cooling water to the cylinder head cannot be set to "0" even immediately after the internal combustion engine is started, so that the cylinder head is cooled immediately after the internal combustion engine is started, and the cylinder head temperature rises to an appropriate temperature, which is optimum. It takes a long time for the combustion state to be achieved.

The water pump for an internal combustion engine proposed in Japanese Patent Laid-Open No. 4-237898 has both a cylinder head side discharge passage 101 and a cylinder head side discharge passage 102 because of the structure of its control vanes 104 (see FIG. 11). It cannot be closed, and cooling water is always supplied to either the cylinder head or the cylinder block. Therefore, even immediately after the start of the internal combustion engine, it takes a long time for either the cylinder head or the cylinder block to be cooled without fail and the cylinder temperature to rise to an appropriate temperature to achieve the optimum combustion state.

On the other hand, according to the water pump using an electric motor as a drive source, which is proposed in JP-A-57-159916 and JP-A-8-142647, cooling water is supplied by the water pump. By controlling the electric motor so as to stop, it is possible to obtain a state in which the cooling water is not supplied to either the cylinder head or the cylinder block. Therefore,
Immediately after starting the internal combustion engine, the cylinder temperature rises to an appropriate temperature without delay, and the optimum combustion state is realized in a short time. However, in these water pumps, since the electric motor is used as a drive source thereof, there are problems such as a complicated structure of the water pump, an increase in manufacturing cost, and a reduction in design flexibility. Further, in the water pump proposed in Japanese Patent Laid-Open No. 142647/1996, a pump structure, particularly a rotor peripheral structure, is enlarged by providing a rotating body having a vortex chamber that draws an involute curve for housing a rotor. ,
By introducing this enlarged pump structure into a limited space, there arises a problem that the size and arrangement of other devices are restricted.

In view of the above problems, it is an object of the present invention to provide a water pump for an internal combustion engine having a compact structure that enables optimum control of the internal combustion engine temperature immediately after starting the internal combustion engine.

[0009]

The inventor of the present invention shortens the time required for the temperature of the cylinder head and the cylinder block to reach the optimum combustion temperature by not supplying the cooling water to the cylinder head and the cylinder block immediately after starting the internal combustion engine. It has been found that it is possible, and further, at least a cylinder head and a cylinder are used by using a water pump whose drive source is an internal combustion engine without adding a new water pump or using a drive source of the water pump other than the internal combustion engine. By providing a water pump with a compact structure equipped with a rotary valve that realizes a state in which cooling water is not supplied to the block, that is, a fully closed state, it is possible to shorten the time to reach the optimum combustion temperature. It was found that the present invention has been achieved.

In order to achieve the above-mentioned object, the means of the present invention comprises a cooling water delivery means provided in a housing, a first discharge port and a first discharge port capable of discharging the cooling water delivered from the cooling water delivery means. A first position having two discharge ports and at least one control blade, and allowing the communication between the first discharge port and the cooling water delivery means with the rotation of the control blade; It is possible to switch between a second position that allows communication between the discharge port and the cooling water delivery means and a third position that blocks communication between the discharge port and the cooling water delivery means. And a rotary valve rotatably disposed in the housing.

In the above means, preferably, the cooling water delivery means includes a rotor axially supported by the housing,
A swirl chamber formed in the housing and having the rotor housed therein, wherein the control vanes of the rotary valve are configured to change a gap between the rotor and the housing at a start end of the swirl chamber. In addition, it is possible to project into the vortex chamber according to three positions of the rotary valve.

More preferably, the control vanes of the rotary valve are separated from each other by a predetermined angle so that the discharge ports can be closed at the same time, and the two plates are fixed to a pivot shaft rotatably supported by the housing. It is characterized in that it is a member.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 to 3 are block diagrams for explaining a schematic configuration of a cooling device using a water pump for an internal combustion engine according to an embodiment of the present invention.
W, the first set water temperature is T1, the second set water temperature is T2, and the thermostat valve opening temperature T3 (where T1 <T2 <T3), in the case of TW> T2 in FIG. 1, T1 <TW <T in FIG.
2 shows the state of the water pump in the case of TW> T3.

1 to 3, two independent discharge ports of a water pump 10 driven by an internal combustion engine, a cylinder head 11, and a cylinder block 12 are provided with a discharge port switching valve as a cooling water supply switching means. A cylinder head side cooling water passage 14 and a cylinder block side cooling water passage 15 are respectively connected between these. Cylinder block 12
The cooling water passage in the inside communicates with the cooling water passage in the cylinder head 11 via a water jacket (not shown), and the cooling water in the cylinder head 11 and the cooling water in the cylinder block 12 join together to cool the cylinder head. The cooling water joined from the water discharge pipe is supplied to the thermostat 17 or the radiator 18 via the heater 16 and the bypass pipe 19 and circulates to the water pump 10, respectively. In the thermostat 17, the cooling water temperature TW is the thermostat valve opening temperature T3.
When it exceeds, the cooling water is circulated to the water pump 10 through the radiator 18. The discharge port switching valve provided in the water pump 10 is driven by a DC motor (or an actuator or the like) not shown to switch the cooling water discharge port of the water pump 10, and the DC motor is the cylinder head 11
It is controlled by the output of a temperature sensor (not shown) attached to the.

Next, the operation of the water pump of this internal combustion engine will be described. First, immediately after the internal combustion engine is started, the discharge port switching valve provided in the water pump 10 is fully closed, and cooling water is not supplied to the cylinder head 11 and the cylinder block 12. Therefore, the cooling water does not circulate, the temperature of the cylinder head 11 and the cylinder block 12 rapidly rises due to combustion, and the cooling water staying in the cylinder head 11 and the cylinder block 12 is warmed.

Referring to FIG. 2, next, when the cooling water temperature TW exceeds the first set water temperature T1 in the warm-up state of the internal combustion engine, the discharge port switching valve provided in the water pump 10 is driven. The cooling water is supplied only to the cylinder head 11 side. The cooling water that circulates and cools in the cylinder head 11 is supplied to the heater 16 to warm the heater 16, and the heater 16 can blow hot air.

Referring to FIG. 1, next, when the cooling water temperature TW further rises and exceeds the second set water temperature T2, the discharge port switching valve provided in the water pump 10 is driven,
Cooling water is supplied only to the cylinder block 12 side. The cooling water supplied to the cylinder block 12 side circulates to the cylinder head 11 side via the water jacket. The cooling water that circulates and cools the cylinder head 11 and the cylinder block 12 flows back to the water pump 10 via the heater 16 or the bypass pipe 19.

Referring to FIG. 3, next, when the cooling water temperature TW further rises and exceeds the valve opening temperature T3 of the thermostat 17, the thermostat 17 closes the bypass pipe 19, and the cylinder head 11 and Cylinder block 12
After being cooled and warmed, the cooling water is cooled by passing through the radiator 18, and then is circulated to the water pump 10.

As described above, the discharge port switching valve provided in the water pump 10 closes the discharge port on the cylinder head 11 side, opens the discharge port on the cylinder block 12 side, opens the discharge port on the cylinder head 11 side, and opens the cylinder block 12. Side discharge port closed, cylinder head 11 side discharge port closed,
The cylinder block 12 side discharge port can be closed in three positions, and the positions 1 to 3 are selected according to the internal combustion engine (engine) starting state and the internal combustion engine state such as cooling water temperature. In particular, the water pump of this internal combustion engine
By making it possible to close the discharge port on the cylinder head 11 side and close the discharge port on the cylinder block 12 side, the cooling control range of the internal combustion engine is expanded, and the cylinder head 11 and the cylinder Since a state in which the cooling water is not supplied to any of the blocks 12 can be achieved, the time from the start of the internal combustion engine to the reaching of the optimum combustion temperature is shortened.

The temperature sensor for measuring the cooling water temperature TW may be mounted on the cylinder head 11 as described above, or may be mounted on both the cylinder head 11 and the cylinder block 12, and the first setting is made on the cylinder head 11 side. By providing a control system that detects the cooling water temperature TW that compares with the water temperature T1 and the cooling water temperature TW that compares with the second set water temperature T2 on the cylinder block 12 side, respectively, the water pump of the internal combustion engine can be optimally controlled. Made possible.

Further, in place of the system in which the cooling water on the cylinder head 11 side and the cooling water on the cylinder block 12 side merge in the cylinder head 11, the cooling water on the cylinder head side and the cooling water on the cylinder block side are connected to the outside of the cylinder head and the cylinder block. The water pump of the internal combustion engine described above can be applied to the system that merges with.

4 to 6 are sectional views for explaining the structure of the water pump for the internal combustion engine according to the embodiment of the present invention. FIG. 4 shows a state immediately after the internal combustion engine is started, FIG. 5 shows a state where the internal combustion engine is warming up, and FIG. 6 shows a state after the warming up. Figure 7-
FIG. 9 is an enlarged view of the water draining section 5 shown in FIGS. 4 to 6, respectively.

Referring to FIGS. 4 to 6, a water pump 10 provided with a rotary valve 3 as a discharge port switching valve and driven by an internal combustion engine has a cylinder head side adjacent to each other in its housing. Discharge port (first discharge port) 1
A cylinder block side discharge port (second discharge port) 2, a rotor (cooling water delivery means) 6 housed in the vortex chamber and provided with an impeller, and both discharge ports 1 and 2 between the rotor 6 and the rotor 6. The rotary valve 3 is a cooling water discharge port switching valve disposed in close proximity to the rotary valve 3. The rotary valve 3 is provided with two control blades 4a and 4b facing each other with a distance of approximately 180 ° therebetween. The control blade 4a is rotated so that both ends of the control blade 4a come into contact with a predetermined position of the housing,
Cylinder head side outlet 1 is closed, cylinder block side outlet 2 is opened, cylinder head side outlet 1 is opened, cylinder block side outlet 2 is closed, cylinder head side outlet 1 is closed, cylinder block side outlet 2 can be closed and 3 positions can be taken. Between the outer periphery of the rotor 6 and the ends of the control blades 4a, 4b that are in contact with the housing formed to project toward the rotary valve 3 is a draining portion 5 (located at the start end of the vortex chamber). The clearance between the ends of 4 a and 4 b and the outer circumference of the rotor 6 becomes the clearance of the draining section 5. By providing the control blade 4b, the above-mentioned 3
It is possible to change the clearance of the water draining section 5 in three stages depending on the position. Further, the cylinder block side discharge port 2 is divided into two by being partitioned by a current plate. When this water pump 10 is applied to the water pump of the internal combustion engine of FIGS. 1 to 3, the cylinder head side discharge port 1 is in the cylinder head side cooling water passage 14, and the cylinder block side discharge port 2 is in the cylinder block side cooling water passage. 15 are connected respectively.

Next, the operation of this water pump will be described. Referring to FIG. 4, immediately after the internal combustion engine is started, both the cylinder head side discharge port 1 and the cylinder block side discharge port 2 are closed by the control vanes 4a. Therefore, since the cooling water is not supplied to both the cylinder head and the cylinder block, the temperature rising rate of the cylinder head and the cylinder block due to combustion is increased. Also, the drainer 5
7, which is an enlarged view of FIG. 7, the clearance of the drainer 5 is maximized by the control blade 4a. As a result, it is possible to prevent the occurrence of cavitation and reduce the pump drive torque.

Referring to FIG. 5, when the internal combustion engine is warming up,
The cylinder block side discharge port 2 is closed by the control blade 4a, and the cooling water pumped from the rotor 6 is sent to the cylinder head side discharge port 1. Further, referring to FIG. 8 which is an enlarged view of the water draining portion 5, the clearance of the water draining portion 5 is set to an intermediate width by the control blade 4a.

Referring to FIG. 6, when the internal combustion engine is warmed up,
The cylinder head side discharge port 1 is closed by the control blade 4a, and the cooling water pumped from the rotor 6 is sent to the cylinder block side discharge port 2. In addition, referring to FIG. 9 which is an enlarged view of the draining section 5, the draining section 5 is controlled by the control blade 4b.
Has a minimum clearance.

The positions of the rotary valve 3 shown in FIGS. 4 to 6 are selectively controlled according to the starting state of the internal combustion engine and the state of the internal combustion engine such as the coolant temperature as described above. Even in the device in which the rotor 6 is rotated by the driving force output from the internal combustion engine itself by the rotary valve 3 having three positions as described above, the driving force connecting / disconnecting means is not separately provided between the internal combustion engine and the rotor 6. A state in which cooling water is not supplied (circulated) to each part of the internal combustion engine is achieved. Further, by narrowing the clearance of the water draining portion 5 in the order of FIG. 7, FIG. 8 and FIG. 9, the rotational speed of the rotor 6 is the same depending on the destination of cooling water and the fully closed state in which no cooling water is supplied. Even in such a case (for example, even when the number of revolutions of the internal combustion engine that drives the rotor 6 is the same), the discharge amount can be varied. That is, according to this device, the clearance of the water draining portion 5 is maximized immediately after the start, the load on the rotor 6 is reduced (see FIG. 7), and a larger amount of cooling water is supplied than during warm-up (see FIG. 8). After the required warm-up (see FIG. 9), the cooling water discharge amount can be increased at the same rotation speed of the rotor 6.

FIG. 10 shows another embodiment of the present invention.
It is sectional drawing of a water pump. The water pump shown in FIG. 10 and the water pump 10 shown in FIGS.
The structure of the outlet switching valve and the outlet 1 on the cylinder head side
The difference is only the opening diameter and the shape of the housing near the opening.

Referring to FIG. 10, the control vanes of the discharge port switching valve (rotary valve) are configured so that the cylinder head side discharge port 1 and the cylinder block side discharge port 2 can be simultaneously closed.
It is composed of two door-shaped control blades 4a and 4b which are separated by 0 ° and are pivotally fixed to a control blade center shaft 7 which is a pivot.
The control vanes 4a and 4b are located at the positions shown by the solid lines in FIG.
Are closed, and either the cylinder head side discharge port 1 or the cylinder block side discharge port 2 is closed and the other discharge port is opened at the position indicated by the phantom line. As described above, in the water pump including the discharge port switching valve shown in FIG. 10, the cylinder head side discharge port 1 is closed, the cylinder block side discharge port 2 is opened, the cylinder head side discharge port 1 is opened, and the cylinder block side discharge port is opened. Exit 2 closed, cylinder head side outlet 1 closed, cylinder block side outlet 2
Since it can be closed in 3 positions,
~ It can be suitably applied to the water pump of the internal combustion engine shown in FIG.

[0031]

As described above, according to the present invention,
A state in which cooling water is supplied to the part of the internal combustion engine that communicates with the first discharge port, a state in which cooling water is supplied to the part of the internal combustion engine that communicates with the second discharge port, and a state in which no cooling water is supplied to both parts. By providing the housing with a rotary valve that switches the supply state of the cooling water to at least three states, the cooling control range of the internal combustion engine is expanded. By this, in particular, a state in which cooling water is not supplied to the cylinder block and the cylinder head as the portion is achieved without inviting an increase in the size and manufacturing cost of the water pump,
In this state, the temperature rising speed of the internal combustion engine is increased by the combustion immediately after the internal combustion engine is started, so that the time required to reach the optimum combustion temperature is shortened.

Furthermore, the control vanes of the rotary valve can be projected into the swirl chamber in accordance with the three positions of the rotary valve so that the clearance between the rotor and the housing at the starting end of the swirl chamber can be varied. According to the position of, that is, the cooling water supply destination or the fully closed state, the cooling water discharge amount can be changed,
Further, the cooling control width is expanded (claim 2).

[Brief description of drawings]

FIG. 1 is a block diagram for explaining a configuration of a cooling device using a water pump of an internal combustion engine according to an embodiment of the present invention, showing a state of cooling water temperature TW> second set water temperature T2. Yes (however, the first set water temperature T1 <T2 <T
3).

FIG. 2 is a block diagram for explaining the configuration of a cooling device using a water pump for an internal combustion engine according to an embodiment of the present invention, where a first set water temperature T1 <cooling water temperature TW <second
It is a figure which shows the state of setting water temperature T2 (however, T1 <T2.
<T3).

FIG. 3 is a block diagram for explaining the configuration of a cooling device using a water pump for an internal combustion engine according to an embodiment of the present invention, showing a state of cooling water temperature TW> thermostat valve opening temperature T3. Yes (however, T1 <T2 <T
3).

FIG. 4 is a cross-sectional view for explaining the configuration of a water pump for an internal combustion engine according to an embodiment of the present invention, showing a state immediately after starting the internal combustion engine.

FIG. 5 is a cross-sectional view for explaining the configuration of the water pump of the internal combustion engine according to the embodiment of the present invention, showing a state during warm-up of the internal combustion engine.

FIG. 6 is a cross-sectional view for explaining the configuration of the water pump of the internal combustion engine according to the embodiment of the present invention, showing a state after the internal combustion engine is warmed up.

FIG. 7 is an enlarged view of the water draining section 5 shown in FIG.

FIG. 8 is an enlarged view of the water draining section 5 shown in FIG.

9 is an enlarged view of the water draining section 5 shown in FIG.

FIG. 10 is a cross-sectional view of a water pump for an internal combustion engine according to another embodiment of the present invention.

FIG. 11 is a cross-sectional view for explaining the structure of a conventional water pump for an internal combustion engine equipped with a flow path switching valve.

[Explanation of symbols]

1 Cylinder Head Side Discharge Port (First Discharge Port) 2 Cylinder Block Side Discharge Port (Second Discharge Port) 3 Rotation Valve (Discharge Port Switching Valve) 4a, 4b Control Blade 5 Drainer 6 Rotor (Cooling Water Delivery Means) 7 Control blade center shaft (pivot shaft) 10 Water pump (cooling water supply switching means) provided with a discharge port switching valve 11 Cylinder head 12 Cylinder block 14 Cylinder head side cooling water passage 15 Cylinder block side cooling water passage 16 Heater 17 Thermostat 18 Radiator 19 Bypass pipe

Continuation of the front page (56) Bibliography Sho 62-74199 (JP, U) Rikai Hei 1-145364 (JP, U) Rikai Hei 4-111598 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) F01P 5/10 F01P 7/16 F04D 29/44

Claims (3)

(57) [Claims] 1. A cooling water delivery means provided in a housing, a first ejection port and a second ejection port capable of ejecting the cooling water delivered from the cooling water delivery means, and at least one control blade. Then, with the rotation of the control blade, a first position that allows communication between the first discharge port and the cooling water delivery means,
A second position that allows communication between the second discharge port and the cooling water delivery means, and a third position that blocks communication between the both discharge ports and the cooling water delivery means. A water pump for an internal combustion engine, comprising a rotary valve rotatably disposed in the housing so as to be switchable. 2. The cooling water delivery means comprises a rotor axially supported by the housing, and a vortex chamber formed in the housing and accommodating the rotor therein. Is capable of projecting into the swirl chamber in accordance with three positions of the rotary valve so that a gap between the rotor and the housing at a start end portion of the swirl chamber can be varied. A water pump for an internal combustion engine as described. 3. The control blades of the rotary valve are separated from each other by a predetermined angle so that the both discharge ports can be closed at the same time, and are fixed to a pivot shaft rotatably supported by the housing. The water pump for an internal combustion engine according to claim 1, wherein