JP2013181391A - Anti-freezing device of throttle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-freezing device of a throttle body, capable of enhancing a cooling efficiency in the whole cooling system of an engine in a simple structure.SOLUTION: Relating to one having a throttle body 6 constituted such that engine cooling water circulates, the throttle body has a side member 23 having a closed cross-sectional structure in which a running wind flows and which isolates an inside of the same and an engine room, and arranges a portion of a downstream side piping 24 of the throttle body 6 in the side member 23 or connects the same to the side member 23 so as to be able to exchange heat.

Description

  The present invention relates to an anti-freezing device for a throttle body provided in an intake passage of an internal combustion engine.

  When the internal combustion engine is operated under a very low outside air temperature, water vapor may freeze in the intake passage and the throttle valve, causing the throttle valve to malfunction. Patent Document 1 discloses a technique in which a cooling water passage is provided in a throttle body and a part of engine cooling water is circulated to the throttle body to prevent freezing in order to prevent this kind of malfunction.

  Patent Document 2 discloses a vehicle in which traveling wind is introduced into a side member as a related technique of the present invention, although it is not a technique related to prevention of freezing of the throttle body.

JP 2009-121298 A JP-A-8-40087

  By the way, it is necessary to circulate the engine cooling water in the throttle body for a very limited time, for example, immediately after starting the engine in extremely cold time. For this reason, in luxury cars, etc., the engine coolant is circulated in the throttle body only immediately after the engine is started, and when the possibility of freezing in the throttle body is reduced, the circulation of the coolant is stopped by the control valve. There is. By doing so, the circulating flow rate of the cooling water in the radiator is increased, and the cooling efficiency in the entire cooling system of the engine can be improved.

  However, if a control valve or the like is provided on the engine cooling water channel to the throttle body, the engine cooling water circulation path becomes complicated, leading to an increase in cost.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a throttle body anti-freezing device capable of improving the cooling efficiency of the entire engine cooling system with a simple structure.

  In order to achieve the above object, the anti-freezing device for a throttle body according to the present invention is provided with a throttle body configured to circulate engine cooling water, and traveling air circulates inside. A vehicle body component having a closed cross-sectional structure separating the inside and the engine room is provided, and a part of a downstream pipe of the throttle body is disposed in the vehicle body component.

  According to the anti-freezing device for a throttle body having such a configuration, when the vehicle travels, traveling wind flows in the vehicle body components, and the cooling water flowing in the downstream pipe of the throttle body exchanges heat with the traveling wind in the vehicle body components. If the cooling water temperature is higher than the temperature of the traveling wind, the cooling water is cooled.

  The anti-freezing device for a throttle body according to the present invention is premised on the provision of a throttle body configured to circulate engine cooling water, and traveling wind circulates inside the engine room. The vehicle body component part which has a closed cross-section structure which separates may be provided, and some downstream piping of the said throttle body may be joined to the said vehicle body component part so that heat exchange is possible.

  According to the anti-freezing device for a throttle body having such a configuration, when the vehicle travels, the traveling wind flows in the vehicle body components and the vehicle body components are always cooled by the traveling wind, so that heat exchange with the vehicle body components is possible. Cooling water flowing in the downstream pipe of the joined throttle body is cooled.

  According to the anti-freezing device for a throttle body of the present invention, the cooling water flowing in the downstream pipe of the throttle body is cooled by the traveling wind flowing in the vehicle body components, so a control valve or the like is used for the downstream pipe of the throttle body. Therefore, the cooling efficiency of the entire engine cooling system can be improved with a simple structure.

It is a circuit diagram which shows the cooling system of the engine in embodiment of this invention. It is a top view which shows the layout structure of the motor vehicle carrying the anti-freezing device of the throttle body which concerns on embodiment of this invention. It is a top view which shows the layout structure of the motor vehicle carrying the anti-freezing device of the throttle body which concerns on the modification of embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a throttle body freeze prevention apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an engine cooling system 2 in an automobile equipped with a throttle body freeze prevention device 1. In FIG. 1, the solid line arrow shown in the cooling water channel indicates the flow of the cooling water before warming up, and the broken line arrow and the solid line arrow indicate the flow of the cooling water after warming up. FIG. 2 has a layout configuration of an automobile on which the throttle body freeze prevention device 1 is mounted. This automobile is of a type in which the engine 3 is mounted under the floor.

  In the engine cooling system 2 shown in FIG. 1, in a state before warm-up, the coolant temperature is lower than a predetermined temperature, the thermostat valve 7 is closed, and the return water channel 8 from the radiator 4 is closed by the thermostat valve 7. . Therefore, the cooling water in the radiator 4 does not circulate even when the water pump 9 is being driven. In this embodiment, a mechanical water pump driven by the power of the crankshaft of the engine is employed as the water pump 9, and the water pump 9 is always driven while the engine 3 is in operation.

  Cooling water is sucked from the housing 10 of the thermostat valve 7 to the suction side of the water pump 9, and the cooling water is supplied from the pump 9 to the water jacket 13 in the cylinder block of the engine 3 and the water jacket 14 in the cylinder head. . Cooling water that has passed through the water jacket 14 in the cylinder head is discharged out of the engine 3 through an outlet pipe 15 connected to the engine 3. The outlet pipe 15 is connected to the water passage 16 to the radiator 4, but in a state before warming up, the cooling water does not flow to the radiator 4, and the branch water passage 17 to the heater core 5 provided in the middle of the outlet pipe 15 and It flows to the branch waterway 18 for the throttle body 6.

  The cooling water that has flowed to the branch water channel 16 for the heater core 5 passes through the heater core 5 while exchanging heat, and then returns to the housing 10 of the thermostat valve 7 through the return water channel 17 from the heater core 5.

  The cooling water that has flowed into the branch water passage 18 for the throttle body 6 exchanges heat when passing through the throttle body 6 (warms the throttle body 6), and then passes through the return water passage 19 from the throttle body 6 to the thermostat valve 7. Return to the housing 10.

  On the other hand, in the state after the warming-up, the thermostat valve 7 is opened and the return water channel 8 from the radiator 4 is opened when the cooling water temperature is equal to or higher than the predetermined temperature, as shown by the broken line arrow in FIG. The circulation of the cooling water in the radiator 4 is allowed. For this reason, the cooling water discharged from the water pump 9 is supplied to the radiator 4 via the water passage 16 to the engine 3, the outlet pipe 15, and the radiator 4, dissipates heat when passing through the radiator 4, and then returns to the radiator 4. After 8, it returns to the housing 10 of the thermostat valve 7. Note that after the warm-up, the coolant is circulated and supplied to the heater core 5 and the throttle body 6 as before the warm-up.

  The anti-freezing device 1 for a throttle body according to the present embodiment includes a throttle body 6 provided with a cooling water passage therein so that engine cooling water circulates, a side member 23, and a return water passage 19 from the throttle body 6. And a downstream pipe 24 of the throttle body 6 to be formed. In FIG. 2, in order to illustrate the downstream pipe 24 of the throttle body, which is a main part of the invention according to the present embodiment, illustration of an air cleaner or the like at an overlapping position in plan view is omitted.

  The side members 23 are a pair of left and right vehicle body components that extend substantially in the front-rear direction of the vehicle body, and are provided so as to form a flow path for travel air therein. That is, the side member 23 is installed so that the traveling wind that has entered from the traveling wind introduction port on the front surface of the vehicle body is introduced from the front end portion 26 and flows through the side member 23 toward the rear. Further, the side member 23 has a closed cross-sectional structure (closed cross section in which the flow path cross section is rectangular in this embodiment), and the traveling wind flowing through the side member 23 is less affected by the hot air in the engine room. .

  The downstream pipe 24 of the throttle body passes through the inner wall 25 of the side member 23, and a part thereof is disposed in the side member 23. Thus, when the vehicle is traveling, the traveling wind flows in the side member 23, and the cooling water flowing in the downstream pipe 24 of the throttle body 6 exchanges heat with the traveling wind in the side member 23, and the cooling water temperature travels. If it is higher than the wind temperature, it is cooled.

  It should be noted that a portion of the downstream pipe 24 of the throttle body 6 that is not disposed in the side member 23 is preferably covered with a heat insulating material. By doing so, it is prevented that the temperature of the cooling water flowing through the downstream pipe 24 of the throttle body 6 is raised due to the influence of hot air in the engine room. Further, heat exchange may be promoted by forming a metal fin in a portion of the downstream pipe 24 of the throttle body 6 disposed in the side member 23.

  FIG. 3 shows a vehicle equipped with a throttle body anti-freezing device 1A according to a modification of the embodiment described above. That is, in the example shown in FIG. 3, a part of the downstream pipe 24 of the throttle body 6 is not disposed in the side member 23, but the part is joined to the side member 23 so that heat exchange is possible. Yes. That is, a part of the downstream pipe 24 of the throttle body 6 and the side member 23 are always in contact with each other, and both are made of a material capable of transferring heat.

  In this way, when the vehicle is traveling, the traveling wind flows in the side member 23, and the side member 23 is always cooled by the traveling wind, so that the cooling water temperature is higher than the traveling wind temperature. The cooling water flowing in the downstream pipe 24 of the throttle body 6 joined to the side member 23 so as to be able to exchange heat is cooled.

  As is clear from the above description, according to the throttle body freeze prevention devices 1 and 1A according to the present embodiment and the modifications thereof, the cooling efficiency of the cooling water can be increased with a simple structure. Further, in a vehicle of the type in which the engine 3 is mounted under the floor, a part of the downstream pipe 24 of the throttle body 6 is disposed in the side member 23, so that the pipe 24 is less likely to be damaged by chipping.

  The side member 23 described in the above-described embodiment may be an example of a vehicle body component having a closed cross-sectional structure in which traveling wind circulates in the interior and separates the interior from the engine room. Then, instead of the side member 23, a part of the downstream pipe 24 of the throttle body can be arranged in the vehicle body component or joined to the vehicle body component to obtain the above-described operational effects. it can.

  Further, a vehicle is known in which an engine is mounted under the floor and a discharge blowout hole for traveling wind is provided in the middle of the side member in order to cool the engine. However, the embodiment described above is applied to such a vehicle. If it does so, the running wind which flows through the inside of a side member can be used effectively.

  The present invention can be applied, for example, to an anti-freezing device for a throttle body provided in an intake passage of an internal combustion engine mounted on an automobile.

1,1A Throttle body anti-freezing device 3 Engine (internal combustion engine)
6 Slot body 23 Side member (body component)
24 Downstream piping of throttle body

Claims (2)

In an anti-freezing device for a throttle body comprising a throttle body configured to circulate engine cooling water,
It is a vehicle body component in which traveling wind circulates, and includes a vehicle body component having a closed cross-sectional structure that separates the interior and the engine room,
A throttle body freeze prevention device characterized in that a part of a downstream pipe of the throttle body is disposed in the vehicle body component. In an anti-freezing device for a throttle body comprising a throttle body configured to circulate engine cooling water,
It is a vehicle body component in which traveling wind circulates, and includes a vehicle body component having a closed cross-sectional structure that separates the interior and the engine room,
A throttle body freeze prevention device, wherein a part of a downstream pipe of the throttle body is joined to the vehicle body component so as to allow heat exchange.