JP2001336412A - Blow-by gas passage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blow-by gas passage which can prevent clogging of the blow-by gas passage by lessening the decrease in temperature of blow-by gas, by simple structure at a low cost. SOLUTION: In accordance with the blow-by gas passage 1, when the blow-by gas G being taken out from a blow-by gas outlet A is passed through a chamber 3, the decrease in temperature of blow-by gas G can be lessened for the reason that conduction of potential heat of the blow-by gas G from the chamber 3 to the rocker cover 2 is inhibited by a heat insulating means 4. Therefore, the formation of mayonnaise-like substances by mixing oil mist being contained in the blow-by gas with emulsified condensed water is inhibited, thus the clogging of a hose (a passageway of the blow-by gas) being connected to a pipe C can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow-by gas passage for passing blow-by gas discharged from an engine.

[0002]

2. Description of the Related Art FIG. 5 is a front sectional view of a conventional blow-by gas passage 51 for passing blow-by gas discharged from an engine, and FIG. 6 is a plan sectional view. FIG. 7 is a side sectional view of a conventional blow-by gas passage 51. As shown in FIG. As shown in FIGS. 5 to 7, the conventional blow-by gas passage 51 is formed integrally with the rocker cover 52, and the intersecting partition wall 53 and the baffle plate 54 form a passage 55 through which the blow-by gas G passes. ing. The blow-by gas G is discharged from the engine (not shown) into the rocker cover 52 and the baffle plate 5
After entering the passage 55 from the blow-by gas outlet A opened to the passage 4, passing through the passage 55, being sent from the pipe C to a fresh air side passage (not shown), it is sucked into the engine combustion chamber,
Burned.

[0003]

The conventional blow-by gas passage 51 has a large heat capacity because the rocker cover 52 and the passage 55 are integrally formed, so that the blow-by gas G passes through the passage 55 described above. As a result, the heat retained by the blow-by gas G is taken by the rocker cover 52, so that the temperature of the blow-by gas G drops significantly. for that reason,
The oil mist contained in the blow-by gas G and the emulsified condensed water mix and become turbid, and a substance in a mayonnaise state is generated. The substance in the mayonnaise state clogs a hose (blow-by gas passage path) connecting the pipe C and the fresh air side passage, so that there is a problem that the blow-by gas G cannot pass. Particularly, in the case of an industrial engine, since the on-off repetition operation in a short time and the operation of a single engine are often performed, the above-described problem is likely to occur because the engine ambient temperature, that is, the temperature of the rocker cover 52 and the like does not increase. FIG. 8 is a graph in which the state of temperature decrease of the blow-by gas G in each part of the conventional blow-by gas passage 51 is connected by black circles. In FIG. 8, the graph connected by white circles shows the temperature drop of the blow-by gas G in the blow-by gas passage of the present invention, and the temperature drop of the blow-by gas G passing therethrough is extremely small as described later. It is shown that.

When the rocker cover 52 is made of a synthetic resin for the purpose of weight reduction, the thermal conductivity of the rocker cover 52 is small. Therefore, blow-by gas G
When passing through the above-described passage 55, the amount of heat from the engine oil received due to the splash phenomenon of the engine oil is small, and the temperature of the blow-by gas G is greatly reduced. The hose (passage path of the blow-by gas) connecting the two may be clogged with the aforementioned mayonnaise-state substance.

When the rocker cover 52 is made of aluminum, since the heat conductivity of the rocker cover 52 is high, the temperature of the blow-by gas G passing through the passage 55 increases due to heat radiation from the surface of the rocker cover 52. Because of the lowering, the hose connecting the pipe C and the fresh air side passage is clogged with the aforementioned mayonnaise-state substance.

As a countermeasure against the above-mentioned problem that the passage path of the blow-by gas G is clogged, conventionally, the entire rocker cover 52 and peripheral hoses are heated and kept warm by using an external heat source, so that the blow-by gas G passing therethrough is conventionally removed. The temperature is increasing. However, this countermeasure has a problem that the configuration is complicated and expensive. Alternatively, the temperature of the blow-by gas G passing therethrough is increased by configuring the blow-by gas passage as a separate body and installing the blow-by gas passage in contact with the cylinder head or the cylinder block. However, although this measure is effective for an air-cooled engine, there is a problem that the temperature of the blow-by gas G passing therethrough cannot be increased with a water-cooled engine.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a blow-by gas passage capable of preventing the blow-by gas passage from being clogged by reducing the temperature drop of the blow-by gas at a low cost with a simple structure. It is assumed that.

[0008]

The above object can be achieved by the blow-by gas passage described in the claims.

FIG. 1 is a front sectional view showing the structure of the present invention, and FIG. 2 is a side sectional view thereof. 1 and 2
As shown in FIG. 1, the blow-by gas passage 1 according to claim 1 is formed so as to allow the blow-by gas G discharged from the engine to pass therethrough, and the chamber 3 is detachably attached to the rocker cover 2;
And a heat insulating means 4 for suppressing transmission of the heat of the blow-by gas G to the rocker cover 2 when the gas passes through the chamber 3. With this configuration, when the blow-by gas G extracted from the blow-by gas outlet A passes through the chamber 3, the heat of the blow-by gas G is suppressed from being transmitted from the chamber 3 to the rocker cover 2 by the heat insulating unit 4. , Blow-by gas G
Temperature drop is small. Thereby, the oil mist contained in the blow-by gas G and the emulsified condensed water are mixed and turbid, and the generation of a mayonnaise-state substance is suppressed, and the pipe C and the fresh air side passage are connected. Clogging of the hose (blow-by gas passage path) can be prevented.

According to the blow-by gas passage 1 according to the second aspect, since the heater 5 is provided, the temperature of the blow-by gas G passing therethrough can be increased by the heater 5.
Thereby, generation of the substance in the mayonnaise state can be suppressed, and clogging of the passage of the blow-by gas G can be prevented.

According to the blow-by gas passage 1, the chamber 3 has the gas-liquid separating means 6 for separating the oil mist (liquid component) contained in the blow-by gas G. Generation of substances can be suppressed, and clogging of the passage of the blow-by gas G can be prevented.

According to the blow-by gas passage 1 of the fourth aspect, the liquid component in the chamber 3 separated by the gas-liquid separation means 6 can be dropped from the opening 7 into the rocker cover 2. , And the generation of a mayonnaise-state substance can be suppressed. Thereby, it is possible to prevent the passage of the blow-by gas G from being clogged.

[0013]

Next, an embodiment of the present invention will be described. FIG. 3 is a front sectional view showing the configuration of the blow-by gas passage 1a according to the first embodiment of the present invention.
As shown in FIG. 3, the blow-by gas passage 1a includes a chamber 3 detachably attached to the rocker cover 2 and a blow-by gas G having heat when the blow-by gas G passes through the blow-by gas passage 1a. A seal gasket (insulating means) 4 interposed between the rocker cover 2 and the chamber 3 and a heater for heating and maintaining the temperature of the blow-by gas G passing through the blow-by gas passage 1a so that the blow-by gas G is hardly transmitted from the locker cover 2 to the rocker cover 2. 5 is provided. Although not shown, the chamber 3 has a partition (formed in the same manner as the gas-liquid separation means 6 in FIG. 2) for separating oil mist contained in the blow-by gas. The chamber 3 is provided with an outlet A for taking out the blow-by gas G from the rocker cover 2 and a pipe C for sending out the blow-by gas G to a fresh air passage (not shown). The blow-by gas G sent out from the pipe C is sent to a fresh air side passage via a hose (not shown) (a passage path for the blow-by gas), and is then sucked into the engine combustion chamber and burned. Further, the chamber 3 is provided with an opening 7 for dropping the oil mist separated by the partition into the rocker cover 2.

By configuring the blow-by gas passage 1a as described above, when the blow-by gas G taken out from the outlet A passes through the chamber 3, the retained heat of the blow-by gas G is transferred from the chamber 3 to the rocker cover 2. Since the transmission is suppressed by the seal gasket 4, the temperature drop of the blow-by gas G can be reduced as shown by the graph connected by the white circle in FIG. As a result, the oil mist contained in the blow-by gas G and the emulsified condensed water are mixed with each other to suppress the formation of a turbid mayonnaise-state substance, thereby connecting the pipe C to the fresh air side passage. Clogging of the hose (blow-by gas passage path) is prevented.

Further, even in the case of an industrial engine which is frequently operated on / off repeatedly in a short time or is often operated alone, the temperature of the blow-by gas G passing through the blow-by gas passage 1a is controlled by the heater 5 attached to the chamber 3. Since it can be increased, the generation of the mayonnaise-state substance can be suppressed.

Further, since the chamber 3 has the partition wall for separating the oil mist contained in the blow-by gas G as described above, it is possible to suppress the generation of the mayonnaise-state substance.

Further, since the oil mist separated by the partition can be dropped into the rocker cover 2 from the opening 7 formed on the lower surface of the chamber 3, the liquid component in the chamber 3 can be reduced. Generation of a substance in a mayonnaise state can be suppressed.

Since the lower portion of the chamber 3 is attached to the inside of the rocker cover 2, the amount of heat from the engine oil received by the engine oil splash phenomenon increases. This also suppresses a temperature drop of the blow-by gas G passing through the blow-by gas passage 1a.

Next, a blow-by gas passage 1b according to a second embodiment will be described. FIG. 4 is a front sectional view showing the configuration of the blow-by gas passage 1b. As shown in FIG. 4, since the basic configuration is the same as that of blow-by gas passage 1a, description of individual members will not be repeated.
A feature of the blow-by gas passage 1b of the second embodiment is that the chamber 3 is mounted so that most of the blow-by gas passage 1b is located inside the rocker cover 2, and the heater 5 is connected to the heat storage portion 9 Is attached to the chamber 3 via the.

As described above, the blow-by gas passage 1b is
Since the main part of the blow-by gas passage 1b is located inside the rocker cover 2, the amount of heat received by the engine oil splash phenomenon is large. Further, since the heat received from the engine oil can be stored in the heat storage portion 9, a decrease in the temperature of the blow-by gas G passing through the blow-by gas passage 1b can be further suppressed. As a result, the temperature of the blow-by gas G passing through the blow-by gas passage 1b can be increased in a short time even in the case of an industrial engine that frequently performs on-off repetition operation in a short time or operation in a single unit. The generation of the substance in the state can be suppressed, and the clogging of the hose (blow-by gas passage path) connecting the pipe C and the fresh air side passage can be prevented.

If the blow-by gas passages 1a of the first embodiment and the blow-by gas passages 1b of the second embodiment described above are formed of a material having a high thermal conductivity, engine oil can be reduced. Since the efficiency of conduction of heat received by the droplets is increased, even if the heat capacity of the heater 5 is reduced, the temperature drop of the blow-by gas is reduced, and the heat storage portion 9 does not need to be used.
The structures of a and 1b are simplified, and the cost can be reduced.

[0022]

According to the present invention, since the temperature of the blow-by gas can be reduced at a low cost with a simple structure,
Blockage of the blow-by gas passage can be prevented.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a configuration of the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a front sectional view of the first embodiment of the present invention.

FIG. 4 is a front sectional view of a second embodiment of the present invention.

FIG. 5 is a front sectional view of a conventional blow-by gas passage.

FIG. 6 is a plan sectional view of a conventional blow-by gas passage.

FIG. 7 is a side sectional view of a conventional blow-by gas passage.

FIG. 8 is a graph showing a decrease in temperature of blow-by gas in a blow-by gas passage according to the present invention and a conventional one.

[Explanation of symbols]

 1, 1a, 1b Blow-by gas passage 2 Rocker cover 3 Chamber 4 Seal gasket (heat insulation means) 5 Heater 6 Partition wall (gas-liquid separation means) 7 Opening 9 Heat storage part G Blow-by gas

Claims (4)

[Claims] 1. A chamber formed to allow a blow-by gas discharged from an engine to pass therethrough and detachably attached to a rocker cover; and a heat retained by the blow-by gas when the blow-by gas passes through the chamber. A blow-by gas passage provided with heat insulating means for suppressing transmission to the rocker cover. 2. The blow-by gas passage according to claim 1, further comprising a heater for increasing the temperature of the blow-by gas. 3. The blow-by gas passage according to claim 1, wherein the chamber has a gas-liquid separating unit that separates a liquid component contained in the blow-by gas. 4. The apparatus according to claim 1, wherein the chamber is provided with an opening for dropping a liquid component contained in the blow-by gas into the rocker cover, in addition to an intake port for taking in the blow-by gas. Blow-by gas passage as described.