JP3671988B2 - Hot water carburetor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a warm water carburetor that warms a carburetor with warm water to prevent icing, and more particularly, to a warm water carburetor that branches engine cooling water and warms the carburetor with the branched water.
[0002]
[Prior art]
In an internal combustion engine that forms an air-fuel mixture with a carburetor and supplies it to the engine, it is necessary to prevent icing of the carburetor during winter or cold.
[0003]
This icing means that the carburetor that inhales the outside air and vaporizes the fuel has a cooling effect due to the latent heat of vaporization of the fuel in the venturi part for forming the negative pressure. This means that the water vapor freezes at a movable part such as a throttle valve or a needle valve, making it impossible to adjust the throttle opening and control the supplied fuel.
[0004]
In order to prevent such icing, a hot water carburetor that guides the engine coolant that has become hot to the carburetor is used.
[0005]
FIG. 9 is a block diagram of a conventional hot water carburetor.
[0006]
This hot water carburetor has a structure in which the water in the branch water channel 81 branched from the cooling water circulation water channel 80 of the water cooling engine 84 is sent to the carburetor 82 to heat it. The cooling water circulation channel 80 is cooled after the cooling water discharged from the pump 83 is sent to the engine 84 to cool it, and the heat received from the engine 84 is sent to the radiator 86 through the thermostat 85 to dissipate the heat. It is a water channel that sucks water with the pump 83 and sends it to the engine 84 again. The thermostat 85 is a valve device that opens and closes the cooling water circulation water passage 80 according to the water temperature, for example, using the volume expansion (contraction) of wax, and the like, and cools the engine 84 when the engine 84 starts or when the outside air temperature is low. The water circulation water channel 80 is closed, and a small amount of water is circulated through the bypass passage 87 only.
[0007]
The branch water channel 81 is a water channel provided for preventing icing of the carburetor 82, and a control valve 88 is interposed therebetween.
[0008]
This control valve 88 is a valve device that opens and closes the branch water channel 81 according to the water temperature. The engine 84 is warmed up, the temperature of the cooling water in the cooling water circulation water channel 80 rises, and the carburetor 82 is heated more than necessary. When there is a possibility that percolation or the like may occur, the branch water channel 81 is closed.
[0009]
Here, percolation means that the carburetor overheats and the fuel boils and enters a gas state.
[0010]
Note that the cooling water in the cooling water circulation channel 80 may pass through the oil cooler 89 before being sent to the engine 84.
[0011]
[Problems to be solved by the invention]
However, the conventional hot water carburetor has a structure in which the branch water passage 81 is branched from the downstream side after passing through the engine 84 of the cooling water circulation water passage 80, and high temperature water that has received the heat of the engine 84 passes therethrough. The control valve 88 is indispensable.
[0012]
The present invention has been made in view of the above-mentioned drawbacks of the prior art. By passing a part of the cooling water before passing through the engine through the carburetor instead of the cooling water after passing through the engine, an expensive control valve is not used. The purpose is to supply a hot water carburetor that can supply appropriate hot water to the carburetor.
[0013]
[Means for Solving the Problems]
In order to achieve the object, the present invention includes an engine 3, a cooling water pump 8 that discharges cooling water and introduces the cooling water into the engine 3, a water channel 2 through which cooling water after cooling the engine 3 flows, and before the cooling of the engine 3. A hot water carburetor comprising a branch water channel (4) for branching cooling water and a carburetor (5) heated by hot water flowing through the branch water channel (4), wherein the branch water channel (4) is connected to the cooling water pump (8) upstream of the engine (3). Branched between the engines 3 and merged with the water channel 2 through which cooling water after cooling of the engine 3 flows downstream of the engine 3 via the carburetor 5 and branches water before cooling of the engine 3 to oil. The branch water communicating with the cooler 7 is provided with a branch water channel 6 different from 4, and the branch water channel 6 circulates through the oil cooler 7, and the cooling water on the upstream side of the engine 3. Branching between the pump 8 and the engine 3, and the downstream of the engine 3 merges with the water channel 2 through which the cooling water after cooling the engine 3 flows, and the branched water channel 4 and the branched water channel 6 are upstream of the carburetor 5. A warm water carburetor is provided that communicates with each other .
[0014]
As a preferred embodiment of the present invention, a control valve is provided in the branch water channel to close the hot water at a predetermined temperature or higher.
[0015]
Furthermore, the present invention provides a hot water carburetor for warming a carburetor in an engine cooling water system that guides water in a cooling water circulation channel that circulates cooling water between an engine and a radiator to an oil cooler, on the upstream side of the engine in the cooling water circulation channel A hot water carburetor comprising: a first branch water channel and a second branch water channel for guiding cooling water to a carburetor and an oil cooler, respectively, and joining both the branch water channels downstream of the engine of the cooling water circulation channel provide.
[0016]
[Action]
Since a part of the coolant before passing through the engine passes through the carburetor, the coolant at the proper temperature cooled by the radiator will pass through the carburetor even after the engine is warmed up, without interposing a control valve. Generation of percolation or the like can be prevented.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory diagram showing the basic configuration of the present invention.
[0018]
The hot water carburetor system 1 sends water from the first branch water channel 4 branched from the upstream side of the engine 3 in the cooling water circulation water channel 2 to the carburetor 5 to warm it to prevent icing and The water is sent to the oil cooler 7 to cool it and to keep the oil temperature properly.
[0019]
The first and second branch water channels 4 and 6 may be branched separately from the main circulation water channel 2, or may be branched once through a common branch pipe 40 as shown in the figure.
[0020]
The cooling water circulation water channel 2 is a water channel for circulating cooling water to the engine 3 through the radiator 9 by the pump 8, and a thermostat 10 is provided downstream of the engine 3. This thermostat 10 is a wax pellet type valve device that opens and closes the cooling water circulation channel 2 according to the water temperature by utilizing the volume change due to the temperature of the resin equipment. In order to shorten the warm-up time when the engine 3 is started. In addition, when the outside air temperature is low during traveling, the cooling water circulation channel 2 is closed and the water is circulated in a small amount through the bypass passage 11 without passing through the radiator 9 in order to prevent the temperature of the cooling water from excessively decreasing. is there.
[0021]
The first and second branch water channels 4 and 6 are joined downstream of the thermostat 10 in the cooling water circulation water channel 2.
[0022]
According to the warm water carburetor system 1 having the above configuration, the carburetor 5 can be warmed with cooling water at a relatively low temperature, for example, 70 to 80 ° C. before being cooled by the radiator 9 and sent to the engine 3, thereby preventing icing. Therefore, unlike the prior art in which the carburetor is heated by the high-temperature cooling water after being sent to the engine 3, no percolation or the like is generated, and an expensive control valve is not required.
[0023]
Further, when the engine 3 is at a low temperature, that is, when the engine 3 is started or when the outside air is cold during running, the thermostat 10 on the main cooling water circulation channel 2 is closed and the cooling water circulates through the bypass passage 11. At the same time, the temperature of the water in the second branch channel 6 is increased by receiving heat from the oil, and the water whose temperature has increased is circulated. Since the water whose temperature has risen also passes through the carburetor 5 of the first branch water channel 4, the carburetor 5 can be warmed faster than when the second branch water channel 6 is not provided.
[0024]
FIG. 2 is an explanatory diagram showing a modification of the basic configuration of the present invention.
[0025]
This hot water carburetor system 41 is different from the hot water carburetor system 1 in FIG. 1 in the arrangement of the bypass passage 11 and the point that the control valve 12 is provided in the first branch water passage 4, but the other points are common. The description of common points is omitted. In this example, the bypass passage 11 is connected to the radiator 9 on the upstream side thereof, and the cooling water circulation passage 2 is closed by the thermostat 10 when the engine 3 is started or when the outside air temperature is low during traveling or the like, and water passes only through the bypass passage 11. A small amount is circulated through the radiator 9.
[0026]
Moreover, as the control valve 12 of the 1st branch water channel 4, the thing of the structure which closes when the temperature of the cooling water of the upstream of the engine 3 rises abnormally, the structure which controls flow volume according to external temperature, etc. are used. . In this way, the low-temperature cooling water before entering the engine is guided to the carburetor, and a control valve is further provided on this branch water channel, so that percolation can be reliably prevented and more precise temperature control can be achieved during abnormal overheating.
[0027]
3-7 is explanatory drawing which shows the specific embodiment of the hot water carburetor system based on this invention. This specific example corresponds to the basic configuration of FIG. 2, and each part number of the specific example of FIGS. 3 to 7 is shown as an overall configuration in FIG.
[0028]
3 and 4 are left and right side views of the internal combustion engine provided with the hot water carburetor system according to the present invention.
[0029]
As described above, the hot water carburetor system of the present invention feeds the water in the first branch water channel 4 branched from the upstream side of the engine 3 in the cooling water circulation water channel 2 to the carburetor 5 to heat it, and the second branch water channel 6. Water is sent to the oil cooler 7 to cool it.
[0030]
The cooling water in the cooling water circulation channel 2 is circulated as follows.
[0031]
A pump 8 is provided on the main pipe 2 a (FIG. 4) on the outlet side of the radiator 9. The cooling water discharged from the pump 8 is introduced into the engine 3 through the main pipe 2b on the pump discharge side. This cooling water passes through a water jacket (not shown) in the engine 3 to cool the engine 3 during this time. The water that has received heat from the engine 3 is sent to the radiator 9 through the main pipe 2c (FIG. 3) on the engine outlet side (downstream side). A thermostat 10 for cutting off the cooling water is provided on the main pipe 2c. The water whose temperature has been lowered by releasing heat from the radiator 9 returns to the pump 8 through the main pipe 2a (FIG. 4) and circulates again.
[0032]
The engine 3 includes a drive system 19 (a primary speed reduction mechanism that transmits the rotation of the crankshaft to the transmission, a clutch that intermittently drives the driving force, and a transmission that adjusts the engine speed and the driving force according to the vehicle speed. And a transmission mechanism for rotating the axle. The pump 8 is disposed below the engine 3. A control valve 12 for controlling the flow rate is provided on the branch pipe 4a of the first branch water channel 4 branched from the main pipe 2b on the discharge side of the pump 8. The cooling water passes through the control valve 12 and is sent to the carburetor 5.
[0033]
The water whose temperature has been lowered by heating the carburetor 5 passes through the branch pipe 4b (FIG. 3), merges with the water passing through the bypass passage 11 of the cooling water circulation water passage 2c on the engine outlet side, passes through the pipe 24, and enters the radiator 9. Sent.
[0034]
Moreover, the cooling water of the 2nd branch water channel 6 branched from the main pipe 2b by the side of the said pump discharge is sent to the oil cooler 7 (FIG. 4). The water that has received heat from the oil cooler 7 is sent to the radiator 9 through the pipe 26 (FIG. 3) constituting the branch water channel 6 on the oil cooler outlet side.
[0035]
According to the hot water carburetor system having the above-described configuration, as described above, the carburetor 5 is formed by the relatively low temperature water introduced from the upstream pipe 2b before passing through the engine 3 in the cooling water circulation channel 2 (2a, 2b, 2c). Can be warmed, icing can be prevented, and percolation and the like can be prevented.
[0036]
FIG. 5 is a rear view of a portion of the radiator 9.
[0037]
The radiator 9 is provided with a cooling fan 27 in the center. A main pipe 2c of the cooling water circulation water channel 2, a pipe 24 after the bypass passage 11 and the branch pipe 4b are joined, and a pipe 26 on the oil cooler outlet side are connected to the inlet side (right side in the drawing) of the radiator. A main pipe 2a through which water cooled by the radiator 9 passes is connected to the lower part on the radiator outlet side.
[0038]
FIG. 6 is an explanatory view of attachment of the control valve 12 provided on the branch pipe 4 a of the first branch water channel 4. The control valve 12 has, for example, a waffle pellet type rod-like structure, similar to the thermostat 10.
[0039]
The pipe 4a to which the control valve 12 is attached has flexibility. The control valve 12 is fitted into one through hole 21 of a rubber sleeve bracket 28 having two through holes 20 and 21 in directions orthogonal to each other. The other through hole 20 of the rubber sleeve bracket 28 is fixed by being fitted into the boss protrusion 13a of the cam chain tensioner 13 (see FIG. 4).
[0040]
FIG. 7 shows details of the main pipe 2 b that sends the cooling water from the pump 8 to the four-cylinder engine 3.
[0041]
The main pipe 2 b has two water supply ports 30, 31, one of which is connected to a water jacket on the back side of the engine of the second cylinder, for example, and the other water supply port 31 is on the back side of the engine of the third cylinder. Communicated with the water jacket.
[0042]
【The invention's effect】
As described above, in the present invention, the carburetor can be warmed with an appropriate low temperature cooling water by guiding the cooling water before cooling the engine to the carburetor, and an expensive control valve is used substantially. With a simple structure, it is possible to prevent icing during cold and cold and prevent percolation during high temperatures.
[0043]
In addition, if a small-diameter branch bypass pipe is provided around the radiator from the main pipe on the engine outlet side, the main pipe is closed with a thermostat and the radiator is passed through the bypass pipe when the engine is cold, such as immediately after cold start. Therefore, the cooling water can be circulated without increasing the effect of preventing icing.
[0044]
In addition, if an oil cooler cooling branch pipe branched from the main pipe is provided, the main pipe can be closed and the cooling water can be circulated through the oil cooler cooling pipe when the engine is cold, thereby cooling the heat dissipation of the oil. It can be used to increase the water temperature, and the icing prevention effect of the carburetor is enhanced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a basic configuration of the present invention.
FIG. 2 is an explanatory diagram showing a modification of the basic configuration of the present invention.
FIG. 3 is a left side view showing an example of implementation of a hot water carburetor system according to the present invention.
4 is a right side view of the hot water carburetor system of FIG. 3. FIG.
5 is a back view showing a portion of the radiator of the hot water carburetor system of FIG. 3. FIG.
FIG. 6 is an explanatory view of attachment of a control valve of the hot water carburetor system in FIG. 3;
7 is an explanatory view of a joint portion for sending water from the hot water carburetor pump of FIG. 3 to the engine.
FIG. 8 is a piping configuration diagram showing the respective parts of FIGS. 3 to 7 as a whole;
FIG. 9 is a configuration diagram of a conventional hot water carburetor system.
[Explanation of symbols]
1: hot water carburetor system, 2: cooling water circulation channel, 3: engine, 4: first branch channel, 5: carburetor, 6: second branch channel, 7: oil cooler, 8: pump, 9: radiator, 10: thermostat 11: Bypass path, 12: Control valve.

Claims (3)

The engine 3, the cooling water pump 8 that discharges the cooling water and introduces it into the engine 3, the water channel 2 through which the cooling water after cooling the engine 3 flows, the branch water channel 4 that branches the cooling water before cooling the engine 3, A hot water carburetor comprising a carburetor 5 heated by hot water flowing through a branch waterway 4,
The branch water channel 4 is branched between the cooling water pump 8 on the upstream side of the engine 3 and the engine 3, and the cooling water after cooling the engine 3 is downstream of the engine 3 via the carburetor 5. Merge with the flowing waterway 2,
A branch water channel 6 different from the branch water channel 4 for branching water before cooling the engine 3 and leading to the oil cooler 7;
The water 6 in the branch water channel circulates through the oil cooler 7 and is branched between the cooling water pump 8 on the upstream side of the engine 3 and the engine 3, and the engine 3 is downstream of the engine 3. Merge with the water channel 2 through which the cooling water after cooling flows,
The warm water carburetor characterized in that the branch water channel 4 and the branch water channel 6 communicate with each other upstream of the carburetor 5 . The hot water carburetor according to claim 1, wherein a control valve 12 is provided in the branch water channel 4 to close the hot water at a predetermined temperature or higher. A radiator 9 disposed in a cooling water passage connecting the downstream of the engine 3 and the upstream of the cooling water pump 8, and a first branch branched from the cooling water flowing from the cooling water pump 8 to the engine 3. A water passage 4, a second branch water passage 6 branched from a cooling water passage flowing from the cooling water pump 8 to the engine 3 and connected to the radiator 9, and an oil cooler 7 disposed in the second cooling water passage 6. heated carburetor of claim 1, characterized in that it comprises.

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