JPH11336546A - Engine cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a water pump in a cooling device of an engine in which the discharge amount of the pump can be regulated. SOLUTION: An engine cooling device 1 is structured so that a water pump 10 is equipped with vanes 46 housed in a pump chamber 44 rotatably and a cooling water (coolant) discharged from the pump chamber 44 with rotation of the vanes 46 is circulated to water jackets 4 and 5, wherein the wall 52 mating with the vanes to bound the pump chamber 44 is provided displaceably in the direction of the rotary shaft of the vanes 46, and a driving means displaces the wall 52 in accordance with the operating conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cooling device capable of adjusting a discharge amount of a water pump.

[0002]

2. Description of the Related Art Since a water pump provided in an automobile engine or the like is driven by an engine via a belt or the like, an operation region in which a discharge amount of the water pump is unnecessarily large occurs, and the engine is excessively cooled. Or the drive loss of the water pump increases.

In response to this, for example, Japanese Patent Laid-Open No. 7-332
The variable-discharge-amount water pump disclosed in Japanese Patent No. 086 includes a low-discharge vane and a high-discharge vane, and stops the rotation of the high-discharge vane via a clutch when the cooling water temperature is low. It has become. As a result, the discharge amount of the water pump is reduced under the operating condition in which the temperature of the cooling water is low, so that the engine is prevented from being excessively cooled and the drive loss of the water pump is reduced.

[0004]

However, in the above-mentioned conventional variable displacement water pump, the structure of the rotating part of the water pump becomes complicated, and the water pump becomes large. .

The present invention has been made in view of the above problems, and has as its object to simplify the structure of an engine cooling device capable of adjusting the discharge amount of a water pump according to operating conditions.

[0006]

Referring to FIG. 1, the invention according to claim 1 includes a vane 46 rotatably housed in a pump chamber 44, and the vane 46 rotates as the vane 46 rotates. The present invention is applied to a cooling device of the engine 1 in which cooling water (cooling liquid) discharged from the pump chamber 44 is circulated through the water jackets 4 and 5.

The pump chamber 4 faces the vane 46.
The vane-facing wall portion 52 that defines 4 is provided so as to be displaceable in the direction of the rotation axis of the vane 46, and includes a driving unit that displaces the vane-facing wall portion 52 in accordance with the operating conditions.

According to a second aspect of the present invention, there is provided a cooling system for an engine.
As the driving means according to the first aspect, a thermostat valve 30 that adjusts the flow of the cooling water according to the temperature of the cooling water is used, and the vane-facing wall portion 52 is displaced as the thermostat valve 30 opens and closes.

According to a third aspect of the present invention, there is provided a cooling device for an engine.
The present invention is applied to a so-called two-system cooling system in which cooling water discharged from the water pump 10 is individually introduced into the water jacket 4 of the cylinder block and the water jacket 5 of the cylinder head.

The thermostat valve 30 operates as a two-system cooling control valve for increasing the amount of cooling water circulating through the water jacket 4 of the cylinder block as the temperature of the cooling water increases, and the vane-facing wall is caused by this operation. The portion 52 is configured to be close to the vane 46.

According to a fourth aspect of the present invention, there is provided a cooling device for an engine.
The main flow of the cooling water in each water jacket 4, 5 is U
As a turn flow, the cooling water is
5, the water pump 10 is disposed in front of or behind the thermostat valve 30,
The valve body 37 of the thermostat valve 30 and the vane facing wall 52 are coaxially connected.

According to a fifth aspect of the present invention, there is provided a cooling system for an engine.
The main flow of the cooling water in each water jacket 4, 5 is U
As a turn flow, the cooling water is
5, the engine 1 is installed so as to be inclined so that the front part is higher than the rear part.

In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0014]

In the engine cooling device according to the first aspect, the vane facing wall portion 52 and the vane 46 are provided.
By reducing the tip clearance C between the tips of the pumps, the pump efficiency is increased and the pump discharge rate is increased. Conversely, by increasing the tip clearance C, the pump efficiency is reduced and the pump discharge rate is reduced. I do.

By displacing the vane-facing wall 52 in accordance with the operating conditions, the required pump discharge rate is obtained, and the flow rate of the cooling water is not increased more than necessary. And the fuel consumption of the engine 1 can be suppressed.

The structure of the rotating section composed of the vanes 46 and the like can be constructed in the same manner as in the conventional apparatus.
0 can be prevented from becoming large.

In the engine cooling device according to the second aspect, it is necessary to provide a dedicated electromagnetic actuator or the like by using the thermostat valve 30 for adjusting the flow of the cooling water according to the temperature of the cooling water as the driving means. Instead, the structure is simplified and the cost of the product is reduced.

In the engine cooling device according to the third aspect, when the cooling water temperature is low, the opening of the thermostat valve 30 becomes small, and the amount of cooling water circulating through the water jacket 4 of the cylinder block decreases. The clearance C increases and the pump discharge amount decreases. As a result, the flow rate of the cooling water is not increased more than necessary, the driving loss of the water pump 10 can be kept small, and the fuel consumption of the engine 1 can be suppressed.

As the temperature of the cooling water rises, the opening of the thermostat valve 30 increases and the amount of cooling water circulating in the water jacket 4 of the cylinder block increases. Accordingly, the tip clearance C decreases and the pump discharge rate decreases. Increase. Thereby, the flow rate of the cooling water sent to the engine 1 is increased, and the cooling performance of the engine 1 can be secured.

In the engine cooling device according to the present invention, the main flow of the cooling water in each of the water jackets is formed as a U-turn flow, so that the inlet and the outlet of each of the water jackets and the thermostat valve are provided. Is provided in front of the engine 1 together with the water pump 10, and the valve body 37 of the thermostat valve 30 is disposed on the rotation axis of the water pump 10, and the vane facing wall 52
Can be driven by the thermostat valve 30 via the rod 54, and the mechanism for driving the vane facing wall 52 can be simplified.

In the engine cooling device according to the fifth aspect, the engine 1 is installed so as to be inclined so that the front part thereof is higher than the rear part thereof, so that the air in each of the water jackets 4, 5 is injected when the water is injected. 1 and can be quickly released from the air release valve.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 5, the engine 1 includes a water jacket 4 formed on a cylinder block 6 and a water jacket 5 formed on a cylinder head 7.
A so-called two-system cooling system, which is partitioned between the cylinder head 7 and the cylinder head 7. Cylinder block 6
The water jacket 4 circulates cooling water (coolant) around four cylinder walls (not shown) arranged in series, while the water jacket 5 of the cylinder head 7 moves around the combustion chamber wall (not shown). Circulate cooling water.

Each of the water jackets 4 and 5 has an inlet for introducing cooling water and an outlet for discharging cooling water at the front of each of the water jackets 4 and 5, respectively. The main flow flows from the front to the rear through the left sides of the water jackets 4 and 5 as shown by arrows in the figure, and then flows from the rear to the front through the right sides of the water jackets 4 and 5, so-called U-turn flow. It has become.

A water pump 10 is provided in front of the engine 1.
Is provided. The water pump 10 sucks in the cooling water guided through the suction passage 11, discharges the cooling water through the discharge passage 12, and sends the cooling water to each of the water jackets 4 and 5.

As shown in FIG. 4, the cooling water flowing out of each outlet of each of the water jackets 4 and 5 is supplied to one outlet passage 1.
Collected in 3. Between the outlet passage 13 of each water jacket 4, 5 and the suction passage 11 of the water pump 10,
The heater passage 18, the cooling passage 19, the heat radiation passage 20, and the bypass passage 21 are arranged in parallel. The cooling water flowing out of the outlet passage 13 is sucked into the water pump 10 from the suction passage 11 after passing through any of the passages 18 to 21. A heater core 17 for heating in the vehicle compartment is interposed in the middle of the heater passage 18. A throttle chamber 25 and an EGR valve housing 26 are interposed in series in the cooling passage 19. A radiator 27 is interposed in the middle of the heat radiation passage 20, and the radiator 27 functions as a heat exchanger for promoting heat radiation from the cooling water to the outside air.

A thermostat valve 14 for opening and closing the heat radiation passage 20 is provided as a flow control valve for adjusting the amount of cooling water flowing through the heat radiation passage 20 in accordance with the temperature of the cooling water. The thermostat valve 14 includes a heat radiation passage 20 and a bypass passage 2.
The heat radiation passage 20 is opened as the temperature of the cooling water flowing through the bypass passage 21 rises above a predetermined value, and is radiated through the radiator 27 to promote heat radiation of the cooling water. The temperature of the cooling water is kept below a predetermined value.

As a flow control valve for adjusting the amount of cooling water flowing through the water jacket 4 of the cylinder block 6 in accordance with the temperature of the cooling water, a thermostat valve 30 for opening and closing the outlet of the water jacket 4 is provided. The thermostat valve 30 opens as the temperature of the cooling water flowing through the outlet passage 13 of the water jacket 5 rises above a predetermined value, and the thermostat valve 30 opens the water jacket 4 of the cylinder block 6.
By circulating the cooling water to promote heat radiation from each cylinder wall to the cooling water, overheating of each cylinder wall is prevented.

As shown in FIG. 1, the thermostat valve 30 includes a container 32 in which a solid wax 33 is sealed as a temperature-sensitive material, and a container 35 in which a plunger 34 displaced in the axial direction due to a change in the volume of the wax 33 is incorporated. This constitutes the temperature sensing section 31. One end of the plunger 34 is supported by an external flange 36, and the valve body 37 is
It is fixed outside. When the temperature of the cooling water is lower than the predetermined value, the valve body 37 is seated on the seat 39 as shown in FIG. 1 by the urging force of the spring 38 to close the outlet of the water jacket 4. In this valve closed state, the temperature sensing portion 31 flows out of the water jacket 5 of the cylinder head 7 and is exposed to cooling water flowing through the outlet passage 13 as indicated by an arrow in the figure. When the temperature of the cooling water rises above a predetermined value, the wax 33 expands and pushes the plunger 34 out of the container 35 as shown in FIG. The outlet of the jacket 4 is opened.

The engine 1 is mounted on the vehicle so that its crankshaft extends in the front-rear direction of the vehicle, and the front of the engine 1 is inclined so that the front is higher than the rear. Gather in the upper front of 5. Correspondingly, the thermostat valve 30 is provided with a jiggle valve (not shown) for releasing the air entering the water jacket 4 of the cylinder block 6 to the outlet passage 13 and for releasing the air entering the outlet passage 13 to the outside. An air bleed valve (not shown) is provided so that air can quickly escape from the inside of each of the water jackets 4 and 5 when water is injected.

The water pump 10 includes a pump body 40 fixed to the front wall of the engine 1 and a pump body 40.
A pump shaft 42 rotatably supported on the pump shaft 42
And a pump chamber 44 for accommodating the rotor 43 and guiding the cooling water. Pump shaft 4
2, a pulley 45 is coupled to a tip end thereof, and rotation of the crankshaft is transmitted through a belt (not shown).

The disk-shaped rotor 43 has a pump shaft 42 projecting from the center of the front end face (rear face), and a plurality of vanes 46 projecting from the rear end face at a constant interval in the circumferential direction. Each of the vanes 46 projects in a helically curved manner, and the cooling water is sent between the vanes 46 in an outer radial direction as the vanes 46 rotate. Pump room 44
The inlet passage 11 is connected to the inside of each vane 46,
The discharge passage 12 is connected to a downstream end located outside each vane 46. The side wall 51 of the pump chamber 44 is formed in a spiral shape, and the pressure is increased by efficiently decelerating the water flow given by the vanes 46 to increase the pressure. Is discharged.

As a gist of the present invention, a vane facing wall portion 52 that defines a pump chamber 44 facing the tip of each vane 46 is provided so as to be displaceable in the axial direction of the pump shaft 42 and discharges the pump. Be able to adjust the amount.

The vane facing wall portion 52 is formed in an annular shape on the front end surface of the disk-shaped plate 53. Vane facing wall 52
Is formed in a conical shape inclined with respect to the pump rotation axis so as to face the tip of each vane 46 in parallel, and a chip clearance between the vane facing wall 52 and the tip of each vane 46 is formed. C is constant in the radial direction.

As a driving means for displacing the vane facing wall 52 in the direction of the pump rotation axis, the plate 53 is a rod 54.
Is connected to the container 33 of the thermostat valve 30. The thermostat valve 30 is connected to the water pump 10
And the valve body 37 of the thermostat valve 30 and the rotor 43 of the water pump 10 are coaxially arranged with each other. The rod 54 has a plate 53 at its front end.
The rear end is connected to the center of the front end face of the container 33. Thereby, the vane facing wall portion 52 is interlocked with the valve body 37 of the thermostat valve 30, and
The valve body 37 is the water jacket 4 of the cylinder block 6
With the opening of the outlet, each tip approaches the vane 46 to reduce the tip clearance C and increase the discharge amount of the water pump 10.

As shown in FIG. 3, the center of the plate 53 is connected to the vane facing wall 52 through a cross-shaped beam 55. Four openings 56 defined between the beams 55 communicate the suction passage 11 and the pump chamber 44.

The operation of the embodiment of the present invention configured as described above will now be described.

By reducing the tip clearance C between the vane facing wall 52 and the tip of each vane 46, the pump efficiency is increased, the pump discharge rate is increased, and conversely, the tip clearance C is increased. As a result, the pump efficiency decreases, and the pump discharge rate decreases.

When the temperature of the cooling water flowing through the outlet passage 13 decreases, the thermostat valve 30 reduces the opening area of the outlet of the water jacket 4 via the valve body 37 and increases the tip clearance C of the water pump 10. Reduce pump output. When the temperature of the cooling water flowing through the outlet passage 13 falls below a predetermined value, as shown in FIG.
The containers 32, 35 are held in the state of being moved leftward in FIG. 1 by the urging force of 8, and the vane facing wall 52 is separated from the tip of each vane 46 to maximize the tip clearance C, and the valve body 37 Is seated on the seat portion 39 and closes the outlet of the water jacket 4. In this manner, the flow rate of the cooling water flowing through the water jacket 5 of the cylinder head 7 at the time of the low temperature of the cooling water is not increased more than necessary, the driving loss of the water pump 10 is reduced, and the fuel consumption of the engine 1 is suppressed. Can be

In the two-system cooling system, the thermostat valve 30 reduces the amount of cooling water circulating in the water jacket 4 of the cylinder block 6 when the temperature of the cooling water is low, thereby keeping the oil temperature for lubricating the cylinder wall high and reducing the friction of the piston. Reduce the fuel consumption of the engine 1. On the other hand, since the cooling water in the water jacket 5 of the cylinder head 7 constantly circulates, a rise in the temperature of the combustion chamber wall of the cylinder head 7 can be suppressed and knocking or the like can be prevented.

When the temperature of the cooling water flowing through the outlet passage 13 rises after the operation state in which the calorific value of the engine 1 is large,
The thermostat valve 30 increases the opening area of the outlet of the water jacket 4 via the valve element 37 and reduces the tip clearance C of the water pump 10 to increase the pump discharge amount. Thereby, the flow rate of the cooling water is sufficiently increased, and the cooling performance of the engine 1 can be secured.

The main flow of the cooling water in each of the water jackets 4 and 5 is set to a U-turn flow as indicated by an arrow in FIG. 5, so that the inlet and outlet of each of the water jackets 4 and 5 and the thermostat valve 30 are connected to the water pump 1.
0 is provided at the front of the engine 1. This allows
By disposing the valve body 37 of the thermostat valve 30 and the rotor 43 of the water pump 10 coaxially with each other, the plate 53 can be connected to the container 33 of the thermostat valve 30 via the rod 54. By driving the vane-facing wall 52 by the thermostat valve 30 adjacent thereto, it is not necessary to provide a dedicated electromagnetic actuator or the like, and the mechanism for driving the vane-facing wall 52 is simplified, and the cost of the product is reduced. Down is measured.

The main flow of the cooling water in each of the water jackets 4 and 5 is defined as a U-turn flow, and the outlets of the water jackets 4 and 5 and the thermostat valve 30 are provided at the front of the engine 1. By arranging the water jackets 4 so as to be higher, the air in each of the water jackets 4 and 5 can be collected at the front of the engine 1 at the time of pouring water and can be quickly released from the air release valve.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a closed state of a thermostat valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an open state of the thermostat valve.

FIG. 3 is a front view of the plate similarly viewed from the direction of arrow A in FIG. 1;

FIG. 4 is a diagram showing a flow of cooling water in the engine.

FIG. 5 is a diagram showing a flow of cooling water in the water jacket.

[Explanation of symbols]

 Reference Signs List 1 engine 4 water jacket 5 water jacket 6 cylinder block 7 cylinder head 10 water pump 11 suction passage 12 discharge passage 13 outlet passage 30 thermostat valve 37 valve body 42 pump shaft 44 pump chamber 46 vane 52 vane facing wall 54 rod

Claims (5)

[Claims] An engine cooling device, comprising: a vane rotatably housed in a pump chamber of a water pump; and circulating a coolant discharged from the pump chamber along with rotation of the vane to a water jacket of the engine. Wherein a vane-facing wall defining the pump chamber facing the vane is provided so as to be displaceable in a rotation axis direction of the vane, and driving means for displacing the vane-facing wall in accordance with an operating condition is provided. A cooling device for an engine, comprising: 2. A structure in which a thermostat valve for adjusting a flow of a coolant according to a coolant temperature is used as the driving means, and the vane-facing wall is displaced in accordance with an opening / closing operation of the thermostat valve. The engine cooling device according to claim 1, wherein: 3. A two-system cooling system in which a coolant discharged from the water pump is individually introduced into a water jacket of a cylinder block and a water jacket of a cylinder head. 3. The engine cooling device according to claim 2, wherein the amount of the coolant circulating through the water jacket of the cylinder block is increased and the vane facing wall portion is made closer to the vane. 4. A configuration in which the main flow of the coolant in the water jacket is a U-turn flow so that the coolant flows in and out of a front portion of the water jacket, and a front water pump is disposed in front of or behind the thermostat valve. The engine cooling device according to claim 3, wherein the valve body of the thermostat valve and the vane facing wall are connected coaxially. 5. A structure in which the main flow of the coolant in the water jacket is a U-turn flow so that the coolant enters and exits at the front of the water jacket, and the engine is installed at an angle so that the front is higher than the rear. The engine cooling device according to any one of claims 1 to 4, wherein: