JPH0224901Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention is a system for extracting engine cooling water from an engine cooling water channel for intake air preheating formed integrally with an intake manifold for use in heating a passenger compartment.
This invention relates to a water outlet structure for an engine heater.

(Prior art) In order to preheat the intake air (mixture) using the engine cooling water that cools the engine body, a cooling channel is provided in the intake manifold through which heated engine cooling water flows, and the In order to heat the passenger compartment using cooling water, for example, an engine was developed in which the engine cooling water flowing through a cooling channel provided in the intake manifold was taken out and guided to a heater for heating the passenger compartment. It is known as described in Japanese Patent No. 57-109222.

In such an engine, a cooling water channel system through which engine cooling water flows has conventionally been configured as shown in FIG. 2, for example. In the configuration shown in FIG. 2, 1 is an engine body, 2 is a radiator, and a main cooling water channel 3 through which cooling water flows to cool the engine body 1 is connected to the radiator 2. It is provided. A thermostat 4 is installed on the downstream side of the main cooling water channel 3, that is, at a portion where the cooling water that has passed through the engine body 1 is sent back to the radiator 2. A pump 5 for pumping engine cooling water is provided on the upstream side of the cooling water channel 3, that is, at the part where the cooling water is sent from the radiator 2 to the engine body 1. The engine body 1 is cooled by flowing into the engine body 1. Further, a portion of the engine cooling water flowing through the main cooling waterway 3 is guided to the intake manifold 10 as shown by arrows p and q in FIG. 2 in order to preheat the intake air.

As shown in FIG. 3, the intake manifold 10 divides the air-fuel mixture (indicated by the chain arrow k) flowing down from the carburetor (not shown) into the engine body 1.
An intake branch passage 6a leading to each cylinder (not shown),
6b, 6c, and 6d, and further includes a riser section 8 where these intake branch passages 6a, 6b, 6c, and 6d gather; The first cooling water channel 7a and the second cooling water channel 7b leading along the road portion are integrally formed.
The first cooling water channel 7a and the second cooling water channel 7b form a gathering part of the intake branch passages 6a, 6b, 6c, and 6d, and merge at the riser part 8, which is the main preheating part in preheating the intake air. 9.

The engine cooling water flowing through the first cooling waterway 7a and the second cooling waterway 7b preheats the intake air, and then flows through the first cooling waterway 7a and the second cooling waterway 7b.
As shown by the arrow s in FIG. 2, the cooling water is led from the cooling water outlet 11 provided at the confluence part 9 to the vehicle interior heating heater 15 through the heater engine cooling water supply path 12, and the retained heat is After being used for heating, the water is returned to the suction side of the pump 5 of the main cooling water channel 3 through the heater engine cooling water recovery path 13, as shown by the arrow t in FIG. Note that a cooling water switching valve 16 is provided between the cooling water outlet 11 of the heater engine cooling water supply path 12 and the vehicle interior heating heater 15, and the cooling water switching valve 16 can be switched. Therefore, when there is no need to heat the vehicle interior, the engine cooling water can be circulated through the bypass passage 17 and the heater engine cooling water recovery passage 13 without passing through the vehicle interior heating heater 15. ing.

By the way, in an engine in which engine cooling water is guided to the intake manifold 10 to preheat the intake air as described above, when the intake air is brought into a superheated state by preheating with the engine cooling water, the filling efficiency of the intake air decreases. If the temperature of the intake air is raised above the appropriate temperature, the engine flow through the riser section 8 through the first cooling water channel 7a and the second cooling water channel 7b will result in a decrease in engine output. It is necessary to reduce the flow rate of cooling water.

However, in an engine configured with a cooling water passage section through which engine cooling water flows as shown in FIG. , is opened at the confluence part 9 of the first cooling water channel 7a and the second cooling water channel 7b located in the riser part 8 which is the main preheating part, thereby preventing the intake air from being overheated more than necessary. If you reduce the flow rate of engine cooling water passing through the riser section 8,
Inevitably, the flow rate of the engine cooling water sent from the cooling water outlet 11 to the heater engine cooling water supply path 12 is also restricted, and as a result, the supply of engine cooling water to the cabin heating heater 15 is reduced. This causes the inconvenience of causing an unsatisfactory situation. That is, for example, in order to reduce the amount of engine cooling water passing through the riser section 8, the first cooling water channel 7
A, the second cooling water channel 7b, or the main cooling water channel 3 is provided with valve means, orifices, etc.
When the flow rate of engine cooling water flowing through the cooling water channel 7a and the second cooling water channel 7b is throttled, the cooling water outlet 1
The flow rate of the engine cooling water taken out from the heater 15 decreases, and a sufficient amount of engine cooling water is no longer supplied to the heater 15 for heating the passenger compartment. This results in a situation where a sufficient heating effect cannot be obtained, and the engine cooling water cannot be used effectively.

Note that even if only one cooling water channel is provided in the intake manifold 10 to guide the engine cooling water to the riser section 8, naturally, if the flow rate of the engine cooling water passing through the riser section 8 is throttled, The flow rate of the engine cooling water supplied to the heating heater 15 is also reduced, causing the same inconvenience as described above.

(Purpose of the invention) In view of the above, the present invention takes out engine cooling water from a cooling water channel for intake air preheating formed integrally with the intake manifold and supplies it to the heater for heating the passenger compartment. without reducing the engine cooling water supplied to the cabin heater.
The flow rate of the engine cooling water used for intake air preheating can be reduced, preventing the intake air from overheating, and making it possible to supply a sufficient amount of engine cooling water to the cabin heater. The purpose of the present invention is to provide a water outlet structure for an engine heater.

(Structure of the invention) The engine heater water outlet structure according to the invention includes an intake manifold including a plurality of intake branch passages and a riser portion where these passages gather, and a first intake manifold that branches from a main cooling water passage provided in the engine body. the cooling water channel and the second cooling water channel are integrally formed, and the first cooling water channel passes through the riser part and is arranged such that a throttle means is provided upstream of the riser part, Further, the second cooling water channel is arranged so as not to pass through the riser part, and the first and second cooling water channels form a confluence part on the downstream side of the riser part in the first cooling water channel. A cooling water outlet for taking out the engine cooling water to be supplied to the heater for heating the passenger compartment is formed at this confluence part.

By doing so, even if the flow rate of the engine cooling water flowing through the first cooling water passage passing through the riser part is throttled by the throttle means, the cooling for taking out the engine cooling water to be supplied to the heater for heating the passenger compartment can be continued. The flow rate of engine cooling water taken out from the water intake port can be maintained without decreasing, and as a result,
This makes it possible to prevent overheating of the intake air and to supply sufficient engine cooling water to the heater for heating the passenger compartment.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing a cooling water channel system through which engine cooling water flows, to which an example of an engine heater water outlet structure according to the present invention is applied.

In FIG. 1, portions corresponding to those shown in FIG. 2 described above are designated by the same reference numerals as in FIG. 2, and redundant explanation thereof will be omitted.

In the example of FIG. 1, the intake manifold 10
Similar to the one shown in FIG. 2 described above, the intake branch passages 6a, 6b, 6c, and 6d are provided with a riser portion 8 where these are assembled. 6c and 6d
are adapted to separate and guide the air-fuel mixture flowing down from the carburetor to each cylinder of the engine body 1, respectively. In addition, the intake manifold 10 includes a first cooling channel 7a' and a second cooling channel 7b', which branch from the main cooling channel 3 provided in the engine body 1 and allow a portion of the engine cooling water to flow therethrough. is integrally formed.

Of these first cooling water channels 7a' and second cooling water channels 7b', the first cooling water channel 7a' is connected to the riser section 8.
The second cooling water channel 7b' is arranged so as to pass through the riser part 8, thereby forming a wide part at the riser part 8. On the other hand, the second cooling water channel 7b' is arranged so as not to pass through the riser part 8. The first cooling channel 7a' and the second cooling channel 7a' merge downstream of the riser section 8 of the first cooling channel 7a' to form a confluence section 9', and the main cooling channel 7a' The engine cooling water that is branched from the main cooling water channel 3 and flows through the riser part 8 through the first cooling water channel 7a' is connected to the engine cooling water that is also branched from the main cooling water channel 3 and flows through the second cooling water channel 7b' at the confluence part 9'. It is designed to merge.

The first cooling water channel 7a' and the second cooling water channel 7b' merge, and a heater for heating the passenger compartment is provided at a merging part 9' provided at a side end of the intake manifold 10 that is separated from the riser part 8. A cooling water outlet 11' for taking out the engine cooling water supplied to 15.
A heater engine cooling water supply path 12 extends from this cooling water outlet 11' to a heater 15 for heating the passenger compartment.

In this example, the engine cooling water flowing from the main cooling channel 3 into the first cooling channel 7a' is located on the upstream side of the first cooling channel 7a', that is, at a position close to the branch point from the main cooling channel 3. A suitable throttling means 20, such as a throttling valve or an orifice, is provided for regulating the flow rate. The other parts are constructed in the same manner as the cooling water channel system for flowing engine cooling water shown in FIG. 2 described above.

In the above configuration, when the engine is in operation, the pump 5 is driven and engine cooling water flows into the main cooling water channel 3, and a portion of the engine cooling water flowing through the main cooling water channel 3 flows into the first cooling water channel 7a. ' and the second cooling water passage 7b' to the intake manifold 1.
Guided within 0. The engine cooling water introduced into the first cooling water channel 7a' mainly preheats the intake air in the riser section 8, and also promotes vaporization of the fuel adhering to the riser section 8, thereby improving the combustion performance of the engine. The engine cooling water that has passed through the riser section 8 is taken out from a cooling water outlet 11' formed in a confluence section 9' where the first cooling water channel 7a' and the second cooling channel 7b' join. If necessary, the water is supplied to the vehicle interior heating heater 15 via the heater engine cooling water supply path 12 . On the other hand, the engine cooling water introduced into the second cooling water channel 7b' is transferred to the cooling water outlet 1 without passing through the riser section 8.
1', and is supplied to the vehicle interior heating heater 15 via the heater engine cooling water supply path 12 as required.

Here, if there is a risk that the intake air will be overheated, the throttle means 20 is adjusted as appropriate to reduce the substantial passage cross-sectional area of the first cooling water channel 7a'. As a result, the flow rate of engine cooling water passing through the riser portion 8 is restricted, and overheating of the intake air is prevented. However, from the cooling water outlet 11', engine cooling water is taken out from both the first cooling water channel 7a' and the second cooling water channel 7b' in which the flow rate of the engine cooling water flowing therein is not throttled. Because
The flow rate of the engine cooling water supplied to the heater engine cooling water supply passage 12 does not decrease due to the reduction in the substantial passage mound area of the first cooling passage 7a'. Thereby, the flow rate of the engine cooling water passing through the riser portion 8 can be reduced, and at the same time, a sufficient amount of engine cooling water can be ensured to be supplied to the heater 15 for heating the passenger compartment. As a result, engine cooling water is effectively used to maintain sufficient cabin heating, and the intake air is prevented from becoming overheated, thereby avoiding a decrease in engine output due to a decrease in intake air filling efficiency. will be done.

In the above example, as shown by the chain line in FIG. 1, the exhaust gas recirculation passage 22 is disposed downstream of the riser portion 8 of the first cooling channel 7a' and along the second cooling channel 7b'. In this case, the engine cooling water whose temperature has been raised by the heat of the exhaust gas is prevented from flowing through the riser section 8, thereby reducing the riser section 8 from being heated more than necessary. In addition, since the engine cooling water heated by the exhaust gas is supplied to the vehicle interior heating heater 15, the heating effect of the vehicle interior heating heater 15 can be further improved.

(Effects of the invention) As is clear from the above explanation, according to the engine heater water outlet structure according to the invention, the first and second cooling channels are formed in the intake manifold, and the water flows through the first cooling channel. The intake air passing through the riser part is preheated by the engine cooling water, and the riser part is prevented from being heated by the engine cooling water flowing through the second cooling channel, and the engine cooling water is supplied to the heater for heating the passenger compartment. A cooling water outlet for taking out water is formed downstream of the riser part of the first cooling channel and the second cooling water channel.
Since the cooling water channel is installed at the confluence with the cooling water channel of In order to prevent the engine cooling water from becoming overheated, the flow rate of the engine cooling water flowing through the first cooling channel can be reduced by the throttle means. Therefore, it is possible to prevent a decrease in engine output due to a decrease in charging efficiency due to overheating of the intake air, and it is also possible to sufficiently supply engine cooling water to the heater for heating the passenger compartment. A sufficient heating effect can be ensured, and engine cooling water can be used effectively.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing a cooling channel system for flowing engine cooling water to which an example of the engine heater water outlet structure according to the present invention is applied, and Fig. 2 is a schematic diagram showing a cooling channel system for flowing engine cooling water. FIG. 3 is a schematic configuration diagram showing an example, and FIG. 3 is a perspective view showing the appearance of an intake manifold in the cooling water channel system through which engine cooling water flows shown in FIG. In the figure, 1 is the engine body, 3 is the main cooling channel, and 6
a, 6b, 6c and 6d are intake branch passages, 7a' is the first cooling channel, 7b' is the second cooling channel, 8 is the riser section, 9' is the confluence section, 10 is the intake manifold, and 11' is the cooling channel. 12 is a water intake port, 12 is an engine cooling water supply path for the heater, and 15 is a heater for heating the passenger compartment.

Claims (1)

[Scope of utility model registration request] An intake manifold including a plurality of intake branch passages and a riser portion where the plurality of intake branch passages gather, a first cooling passage and a second cooling passage branching from a main cooling passage provided in the engine body,
The first cooling water passage passes through the riser part and is arranged such that a throttle means is provided upstream of the riser part, and the second cooling water passage is arranged so as to pass through the riser part, and the second cooling water passage The first and second cooling channels are arranged so as not to pass through the riser section, and the first and second cooling channels form a confluence section downstream of the riser section in the first cooling channel, and the first and second cooling channels are arranged so as not to pass through the riser section. An engine heater water outlet structure formed with a cooling water outlet for taking out engine coolant supplied to a heater for heating a passenger compartment.