JPH061714U - Blow-by gas circulation device for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a blow-by gas circulation device for an internal combustion engine, which prevents the moisture in the blow-by in the shield ventilation system from freezing and blocking the circulation circuit at low temperature. It is an object. [Structure] In a blow-by gas circulation device for an internal combustion engine, which introduces blow-by gas into an intake manifold via a pressure control valve, a pipe is connected to the intake manifold from the pressure control valve via a passage provided in a rocker cover. ing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a blow-by gas circulation device for an internal combustion engine that introduces blow-by gas from which oil is separated into an intake manifold via a pressure control valve provided on a rocker cover.

[0002]

[Prior art]

 Conventionally, for example, as shown in FIG. 3, blowby gas separated from oil in a rocker cover is provided by a pressure control valve (P.C.V.) 2 provided on an upper portion of a rocker cover 1 of an engine, and a rubber hose 3 is provided. There is known a technique in which the blow-by gas is directly connected to the intake manifold 4 and introduced into the intake manifold 4 for circulation.

[0003]

[Problems to be solved by the device]

 However, in a cold region, the blow-by gas is cooled while passing through the mule hose 3 and further cooled by the intake manifold sucking air having a lower temperature. As it is blocked, it causes the blowby gas pressure to rise.

Although Japanese Utility Model Publication No. 63-14011 disclosed by the present applicant is disclosed, it is a technique for separating oil in a blowby and does not solve the above problems.

Therefore, an object of the present invention is to provide a blow-by gas circulation device for an internal combustion engine, which prevents the moisture in the blow-by gas in the shield ventilation system from freezing and blocking the circulation circuit at low temperatures. There is.

[0006]

[Means for Solving the Problems]

 According to the present invention, in a blow-by gas circulation device for an internal combustion engine, in which blow-by gas from which oil is separated is introduced into the intake manifold via a pressure control valve provided in the rocker cover, the blow-by gas is provided in the rocker cover from the pressure control valve. The path outside the rocker cover to the intake manifold via the passage is designed to be the shortest.

[0007]

[Action]

 In the blow-by gas circulation device for an internal combustion engine configured as described above, the blow-by gas in the rocker cover is separated from the oil in the space between the baffle and the cover. C. V. After passing through the hot passage in the rocker cover, it is introduced into the intake manifold by the shortest mule hose, so it will not freeze.

Therefore, the passage is not blocked.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, a rocker cover 1 is attached to an upper portion of a cylinder head 10 via a gasket 9, and a baffle 7 for separating oil is fixed to the rocker cover 1. A pressure control valve (P.C.V.) 2 for controlling the pressure of blow-by gas is provided above the P.V. C. V. The outlet is formed so as to be connected to the outside of the rocker cover through the passages 6a and 6 provided inside the rocker cover 1 by the partition wall 6b.

The rubber hose 11 is connected to the inlet 4 a provided in the intake manifold 4.

Here, reference numeral a indicates a rocker arm, reference numeral b indicates a rocker shaft, reference numeral c indicates a push rod, reference numeral d indicates a valve spring, reference numeral f indicates an adjuster, reference numeral g indicates a rocker bracket, and reference numeral h indicates a valve, respectively. .

Therefore, the blow-by gas that has entered the rocker cover 1 has its oil separated by the baffle 7 and flows as shown by 7a. C. V. The blow-by gas is not cooled from the passage 6a through the passage 6a in the rocker cover and enters the intake manifold 4 by the short rubber hose 11 from 6b, so that the blow-by gas is not frozen at the inlet.

[0014]

[Effect of device]

 Since the present invention is configured as described above, the blow-by gas pressure inside the engine will not rise even if the blow-by gas circulation path is frozen and blocked even at low temperatures in cold regions. Therefore, for example, it is also effective in preventing oil leakage from the engine.

According to the experiment, freezing and blockage did not occur even after 120 minutes of operation at an outside air temperature of −35 ° C.

Further, since the conditions are such that the engine freezes easily, no problem occurred even when the engine oil pan was operated with 50 cc of water.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a view on arrow Y of FIG.

FIG. 3 is a diagram showing a difference in piping between the present invention and a conventional technique.

[Explanation of symbols]

 1 ... Rocker cover 2 ... Pressure valve control (P.C.V.) 3, 11 ... Rubber hose 4 ... Intake manifold 6 ... Passage 7 ... Baffle 8 ... Partition 10 ... Cylinder head

Claims (1)

[Scope of utility model registration request] 1. A blow-by gas circulating device for an internal combustion engine, wherein blow-by gas from which oil is separated is introduced into an intake manifold via a pressure control valve provided in a rocker cover, and a passage provided in the rocker cover from the pressure control valve. Through
A blow-by gas circulation device for an internal combustion engine, characterized in that the path outside the rocker cover to the intake manifold is configured to be the shortest.