JPH0528323Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for introducing blow-by gas from a cylinder head cover or crankcase of an internal combustion engine into an intake system for the internal combustion engine.

[Conventional technology and its problems]

Generally, one way to introduce blow-by gas into an intake system is to introduce blow-by gas downstream from a throttle valve.

In other words, Utility Model Publication No. 60-40811 as prior art
The publication discloses an internal combustion engine in which an intake manifold for an internal combustion engine is provided with a chamber extending in the direction of the cylinder row, and a throttle body having a built-in throttle valve is joined to one end of the chamber in a substantially horizontal direction. It is proposed to drill a blow-by gas hole to introduce blow-by gas from a head cover or the like into the chamber.

However, when the blow-by gas is introduced downstream from the throttle body, the intake negative pressure downstream from the throttle body increases toward the vacuum side in the low load/low rotation range of the internal combustion engine, causing The amount of blowby gas flowing downstream becomes too large in the low load/low rotation range of the internal combustion engine, so the amount of blowby gas in the low load/low rotation range must be reduced in the blowby gas passage downstream from the throttle body. Measures are needed to regulate the amount appropriately.

However, in the prior art, a negative pressure operated control valve is provided in the middle of the blow-by gas passage to the downstream side of the throttle body.
Not only does the large number of parts increase manufacturing costs, but when the internal combustion engine is stopped in winter, the water in the blow-by gas that has accumulated in the control valve freezes, making it impossible to open and close the control valve. There was a situation that would occur.

The present invention aims to solve this problem.

[Means for solving problems]

In order to achieve this object, the present invention connects a throttle body with a built-in throttle valve to the intake manifold for an internal combustion engine in a substantially horizontal direction, and also provides blow-by gas communication to the throttle body for guiding blow-by gas to the downstream side of the throttle body. In a blow-by gas introduction device having a hole, the blow-by gas passage hole in the throttle body is connected to an outlet port formed so as to extend in the axial direction of the throttle body from the joint surface of the throttle body to the intake manifold, and a The blow-by gas passage from the cylinder head, etc. is connected to the upper end of the inlet port, and the inlet port is connected to the bottom of the inlet port. The throttle orifice communicating with the outlet port is arranged so that the axis of the throttle orifice is substantially perpendicular to the axis of the throttle body, similar to the inlet port.

[Functions and effects of the idea]

In this way, by providing the throttle orifice in the middle of the blow-by gas passage in the throttle body, the amount of blow-by gas flowing downstream from the throttle body becomes too large in the low-load and low-speed range of the internal combustion engine. On the other hand, the blow-by gas passage in the throttle body is provided with an outlet port that is bored so as to extend in the axial direction of the throttle body from the joint surface of the throttle body to the intake manifold, and an outlet port that is formed so as to extend in the axial direction of the throttle body from the upper surface of the throttle body. and an inlet port bored downward at a right angle, and the throttle orifice is provided at the bottom of the inlet port so that the axis of the throttle orifice is substantially perpendicular to the axis of the throttle body, similar to the inlet port. ,
When the internal combustion engine is stopped, moisture condensed from the blow-by gas will sequentially flow out from the inlet port and throttle orifice, where the axis is approximately vertical, to the outlet port located below. This prevents moisture from accumulating at the bottom of the inlet port and at the throttle orifice.

That is, according to the present invention, the throttle orifice for regulating the flow rate of blow-by gas downstream from the throttle body can be formed inside the throttle body in a state where moisture does not accumulate at the location of the throttle orifice. This has the effect of reliably preventing an increase in the number of parts when regulating the flow rate of blow-by gas and the occurrence of malfunctions due to freezing of water.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 indicates a four-cylinder internal combustion engine, and reference numeral 2 indicates an inertial supercharging type intake manifold for the internal combustion engine 1.
A chamber 3 extending in the direction of the cylinder row in the internal combustion engine 1, and intake passages 4, 5, 6, each independently connecting the chamber 3 and each cylinder.
A throttle body 10 having a built-in throttle valve 9 is joined to the flange portion 8 formed at one end of the chamber 3 in a substantially horizontal direction.
An intake conduit 11 from an air cleaner (not shown) is connected to.

A blow-by gas passage hole 12 is formed inside the throttle body 10, and a blow-by gas outlet 13 that opens into the chamber 3 is provided in the flange portion 8 of the chamber 3. A hole is formed so as to communicate with the blow-by gas hole 12 when the throttle body 10 is joined, and at one end of the blow-by gas hole 12 in the throttle body 10,
A first blowby gas passage 14 from a blowby gas generating location such as a cylinder head cover in the internal combustion engine 1 is connected.

Then, the blow-by gas passage hole 12 inside the throttle body 10 is connected to the throttle body 10 from the joint surface of the throttle body 10 to the chamber 3 of the intake manifold 2.
Outlet port 1 bored to extend in the axial direction of
2a, and an inlet port 12b bored downward from the upper surface of the throttle body 10 at substantially right angles to the axis of the throttle body 10, and the first blow-by gas passage 14 is connected to the inlet port 12b. A throttle orifice 15 that communicates the inlet port 12b with the outlet port 12a is provided at the bottom of the throttle orifice 12b, with the axis of the throttle orifice 15 substantially perpendicular to the axis of the throttle body 10, similar to the inlet port 12b.

Further, reference numeral 16 indicates a second blow-by gas passage from a blow-by gas generation location such as a cylinder head cover, and this second blow-by gas passage 16
is connected to the throttle body 10 at a portion upstream of the throttle valve 9.

In this configuration, the blow-by gas in the cylinder head cover is caused by the intake negative pressure on the downstream side of the throttle body 10 becoming large in the operating range where the opening degree of the throttle valve 9 is small.
Air is introduced into the chamber 3 via the blow-by gas 14, and air on the upstream side of the throttle valve flows into the cylinder head cover via the second blow-by gas passage 16.
It ventilates the inside of the cylinder head cover.
Chamber 3 from the first blow-by gas 14
The amount of blow-by gas inward can be regulated to an appropriate amount by a throttle orifice 15 in the blow-by gas passage hole 12.

Further, in the operating range where the throttle valve 9 is opened to a large degree, the blow-by gas in the cylinder head cover is introduced into the intake system through both the first blow-by gas passage 14 and the second blow-by gas passage 16.

Then, while the internal combustion engine is stopped, moisture condensed in the first blow-by gas passage 14 and in the inlet port 12b is removed from the inlet port 1.
When moisture flows out into the chamber 3 through the outlet port 12a sequentially from the throttle orifice 15 formed at the bottom of the chamber 2b with its axis substantially vertical, moisture accumulates inside the inlet port 12b and at the throttle orifice 15. In this case, it is more effective if the outlet port 12a is tilted lower toward the inside of the chamber 3, since the flow of moisture toward the inside of the chamber 3 is improved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of an internal combustion engine, and FIG. 2 is an enlarged cross-sectional view taken from the side of FIG. 1. 1...Internal combustion engine, 2...Intake manifold, 3
...Chamber, 8...Joining flange, 9...
... Throttle valve, 10 ... Throttle body, 1
2...Blowby gas hole, 12a...Outlet port, 12b...Inlet port, 13...Blowby gas outlet, 14...First blowby gas passage, 1
5... Throttle orifice, 16... Second blow-by gas passage.

Claims (1)

[Scope of utility model registration request] A blow-by gas introduction method in which a throttle body with a built-in throttle valve is joined to an intake manifold for an internal combustion engine in a substantially horizontal direction, and a blow-by gas hole is bored in the throttle body to guide the blow-by gas to the downstream side of the throttle body. In the device, the blow-by gas hole in the throttle body is formed by forming an outlet port that extends in the axial direction of the throttle body from the joining surface of the throttle body to the intake manifold, and a blow-by gas hole that extends downward from the upper surface of the throttle body at a substantially right angle to the axis of the throttle body. A blow-by gas passage from a cylinder head or the like is connected to the upper end of the inlet port, and a restriction orifice is provided at the bottom of the inlet port to communicate the inlet port with the outlet port. A blow-by gas introduction device for an internal combustion engine, characterized in that the axis of the throttle orifice is substantially perpendicular to the axis of the throttle body, similar to the inlet port.