JPH0587212U - Blow-by gas flow control valve - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Prevents malfunction of the internal combustion engine due to freezing of the blowby gas flow control valve due to heating of the blowby gas flow control valve at the same time as turning on and starting the switch of the internal combustion engine. . A space 2 in a cylinder head cover 1 and an intake passage 4 downstream of a throttle valve 3 are connected by a first blow-by gas passage 5, and a blow-by gas flow control valve 6 is arranged in the first blow-by gas passage 5. . A valve member 12 spring is provided in a valve member operating passage in the valve housing of the blow-by gas flow control valve 6, and a PCT heater 14 is attached to the outside of the valve housing. PCT
An engine switch 15 and a power source 17 are connected in series to the heater 14, and the engine switch 15 is energized when the internal combustion engine is operating. When the engine switch 15 is turned on to operate the internal combustion engine, the PCT heater 14 is energized, the blow-by gas flow control valve 6 is immediately heated, and the function of the blow-by gas flow control valve is restored.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flow control valve of a blowby gas returning device in an internal combustion engine.

[0002]

[Prior Art]

 A first blow-by gas passage that connects a space in the cylinder head cover with an intake passage downstream of the throttle valve of the carburetor, a blow-by gas flow control valve disposed in the middle of the first blow-by gas passage, the space and the air cleaner. There is known a blow-by gas returning device (PCV device) including a second blow-by gas passage communicating with the above. The blow-by gas flow control valve of this conventional blow-by gas reducing device controls the blow-by gas flow rate by a valve member whose position moves according to the negative pressure of the intake pipe. ing.

In the conventional blow-by gas returning apparatus, after the internal combustion engine is stopped, the steam in the blow-by gas cools into water droplets in the first and second blow-by gas passages and descends in the first and second blow-by gas passages. To do. Since the blow-by gas flow rate control valve is provided in the middle of the first blow-by gas passage, the descending water drops enter the blow-by gas flow rate control valve. When the blow-by gas flow control valve is an on / off type, the valve seat does not have a flat surface, and water accumulates in the recess formed by the outer periphery of the valve, the working passage, and the valve seat. When the outside air temperature is below 0 ° C, the water droplets entering the blow-by gas flow control valve become ice, and the valve member of the blow-by gas flow control valve is frozen to make the valve member immobile, or the blow-by gas flow control valve Ice adheres to the ports, bores, and valve operating passages, causing clogging. When the internal combustion engine is started again, the blow-by gas flow control valve remains closed and does not function normally until heat is transferred to the valve member of the blow-by gas flow control valve and the ice melts. If the blow-by gas flow control valve does not function normally, a large amount of blow-by gas will enter the upstream side of the throttle valve through the second blow-by gas passage and the air cleaner, and unburned substances in the blow-by gas will cause the throttle valve to stick. Or sometimes, the passage becomes blocked and the internal combustion engine becomes sick. In a conventional blow-by gas reduction device, a PTC heater is attached to the blow-by gas flow control valve, and when the outside air temperature is 0 ° C or less and the internal combustion engine switch is off (inoperative), a current is passed through the PTC heater to blow-by gas. The valve member of the gas flow control valve is prevented from freezing.

[0004]

[Problems to be solved by the device]

 In the PTC heater of the blow-by gas flow control valve of the conventional blow-by gas reduction device, when the outside temperature is 0 ° C or less and the internal combustion engine is switched off, current always flows in the PTC heater. Therefore, even when the internal combustion engine is not scheduled to be restarted for the time being (for example, one week), if the above two conditions are satisfied, a current will flow through the PTC heater, and power will be wasted. The present invention solves the above-mentioned drawbacks of the blow-by gas flow control valve of the conventional blow-by gas reduction device. The problem is to prevent the internal combustion engine from malfunctioning due to freezing of the valve.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a first blow-by gas passage (5) for communicating a space (2) inside a cylinder head cover (1) of the present invention with an intake passage (4) downstream of a throttle valve (3) In the blowby gas flow control valve (6) installed inside, the valve member (12) and the spring (3) are installed inside the valve member operating passage in the valve housing (10), and the valve housing (10) A PTC heater (14) is attached to the outside of the engine, the engine switch (15) and power supply (17) are connected in series to the PTC heater (14), and the engine switch (15) is energized when the internal combustion engine is operating. To be configured. A temperature switch (16) may be connected in series with the PTC heater (14), the engine switch (15) and the power supply (17) when the internal combustion engine room is below a predetermined temperature (eg 0 ° C). The PTC heater can be installed in a position close to the valve member (12) of the blow-by gas flow control valve (6), and the blow-by gas flow control valve (6) can be installed in the cylinder head cover of the first blow-by gas passage (5). (1) It can be installed in the vicinity.

[0006]

[Action]

 In the blow-by gas flow control valve (6) of the present invention, the PTC heater (14) is not energized when the engine switch (15) is off and the internal combustion engine is inoperative. When the engine switch (15) is turned on and the internal combustion engine is operated, the PTC heater (14) is energized. The blow-by gas flow control valve (6) is immediately heated, the ice that has adhered to the valve member (12), the valve member operating passage, etc., is melted, and the function of the blow-by gas flow control valve (6) is restored. In the present invention, the internal combustion engine operates normally, the blow-by gas scavenging space is the space inside the cylinder head cover (1), the blow-by gas flow control valve (6), the first blow-by gas passage (5), and the intake passage downstream of the throttle valve ( 4) and flows to the internal combustion engine.

[0007]

【Example】

 An embodiment of the blow-by gas flow rate control valve of the present invention will be described with reference to FIGS. The space 2 in the cylinder head cover 1 and the intake passage 4 downstream of the carburetor throttle valve 3 are communicated with each other by a first blow-by gas passage 5, and a blow-by gas flow control valve is provided at a position in the first blow-by gas passage 5 near the cylinder head cover 1. 6 are provided. An air cleaner 7 is arranged upstream of the throttle valve 3, and the inside of the air cleaner 7 and the space 2 in the cylinder head cover 1 are connected by a second blow-by gas passage 8. The valve housing 10 of the blow-by gas flow control valve 6 has an inlet port 9, a valve member operating passage 18 and an outlet port 11, and the valve member 12 is directed toward the inlet port 9 by a spring 13 in the valve member operating passage 18 ( The blow-by gas flow control valve 6 is urged). A PTC heater 14 is mounted outside the valve housing 10 of the blow-by gas flow control valve 6 at a position close to the valve member 12. An engine switch 15, a temperature switch 16 and a power source (battery) 17 are connected in series to the PTC heater 14, and the engine switch 15 is energized when the internal combustion engine is operating. Energize when the temperature is below 0 ℃.

The operation of the embodiment of the present invention will be described. When the engine switch 15 is off and the internal combustion engine is inoperative, the PTC heater 14 is not energized. When the engine switch 15 is turned on and the internal combustion engine is operated, if the temperature inside the engine chamber is below a predetermined temperature (for example, 0 ° C.), the temperature switch 16 is also energized and the PTC heater 14 is energized. The blow-by gas flow rate control valve 6 is immediately heated, the ice that adheres to the valve member 12, the port 9 and the valve member working passage 18 and is frozen is melted, and the function of the blow-by gas flow rate control valve 6 is restored. When the internal temperature of the engine rises above a predetermined temperature (for example, 0 ° C.) due to the operation of the internal combustion engine, the temperature switch 16 is de-energized and the PTC heater 14 is de-energized. When the engine switch 15 is turned on to operate the internal combustion engine, if the temperature inside the engine room is higher than a predetermined temperature (for example, 0 ° C.), the temperature switch 16 is not energized and the PTC heater 14 is not energized. In the embodiment of the present invention, the internal combustion engine operates normally, and blow-by gas scavenging is performed inside the air cleaner 7, the second blow-by gas passage 8, the space 2 in the cylinder head cover 1, the blow-by gas flow control valve 6, and the first blow-by gas. It flows to the internal combustion engine through the gas passage 5 and the intake passage 4 downstream of the throttle valve 3. When the blow-by gas flow control valve 6 is clogged, the scavenging air is scavenged in the space 2 in the cylinder head cover 1, the second blow-by gas passage 8, the inside of the air cleaner 7, the upstream of the throttle valve 3, the throttle valve 3, the downstream of the throttle valve 3, It flows into the internal combustion engine through the intake passage 4, but this does not occur in the present invention.

[0009]

[Effect of the device]

 In the blow-by gas flow control valve of the present invention, a PTC heater is attached to the outside of the valve housing, an engine switch and a power source are connected in series to the PTC heater, and the engine switch is configured to energize when the internal combustion engine is operating. To be done. Therefore, even when the internal combustion engine room temperature drops while the internal combustion engine is stopped and the blow-by gas flow control valve cannot function due to the frozen ice, the PTC heater is turned on when the engine switch is turned on and started. The blow-by gas flow rate control valve is heated when the power is turned on, and the frozen ice in the blow-by gas flow rate control valve is immediately melted, so that the original function of the blow-by gas flow rate control valve can be exerted. The effect is particularly great when the blow-by gas flow control valve is an on-off type. Therefore, it is possible to prevent the blow-by gas from flowing to the upstream side of the throttle valve due to the malfunction of the blow-by gas flow rate control valve, and the sticking of the throttle valve and the like from occurring.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a blow-by gas returning apparatus for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a view showing a blow-by gas flow control valve according to an embodiment of the present invention.

[Explanation of symbols]

 1 Cylinder head cover 2 Space 3 Throttle valve 4 Intake passage 5 First blow-by gas passage 6 Blow-by gas flow control valve 10 Valve housing 12 Valve member 13 Spring 14 PTC heater 15 Engine switch 17 Power supply 18 Valve member working passage

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A first communication passage that connects a space in a cylinder head cover of an internal combustion engine and an intake passage downstream of a throttle valve.
In a blow-by gas flow control valve arranged in a blow-by gas passage, a valve member and a spring are internally provided in a valve member operating passage in a valve housing, a PTC heater is attached to the outside of the valve housing, and a PTC heater is A blow-by gas flow control valve, wherein an engine switch and a power source are connected in series, and the engine switch is energized when the internal combustion engine is operating.