JP2011185197A - Engine intake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine intake device which exactly measures an intake air flow rate with an air flow sensor even when the arrangement of an air cleaner is varied. <P>SOLUTION: A surge tank 3 includes a pair of opposite walls 7, 8 opposed to each other, and a peripheral wall 9 formed between the respective peripheral edges of the pair of opposite walls 7, 8. An air inlet guide tube 5 is provided at the opposite wall 7 on one side. The axis 5a of the air inlet guide tube 5 is directed to the inner surface 8a of the opposite wall 8 on the other side and the inner surface 8a of the opposite wall 8 on the other side is arranged in a direction orthogonal to the axis 5a of the air inlet guide tube 5 so that air 10 introduced through the air inlet guide tube 5 is collided with the inner surface 8a of the opposite wall 8 on the other side in the direction orthogonal to the same. An air outlet guide tube 6 is provided on the peripheral wall 9, the axis 6a of the air outlet guide tube 6 is arranged in a direction parallel to the inner surface 8a of the opposite wall 8 on the other side, and the air flow sensor 2 is mounted to the air outlet guide tube 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an intake device for an engine, and more particularly to an intake device for an engine that can accurately measure an intake flow rate by an air flow sensor even if the arrangement of an air cleaner is changed.

Conventionally, there is an intake device for an engine in which an air flow sensor is arranged downstream of an air cleaner.
According to this type of intake device, there is an advantage that an appropriate fuel supply amount can be determined by measuring the intake flow rate with an air flow sensor.
However, this conventional technique has a problem because an airflow sensor is attached in the middle of the intake pipe.

JP 2006-70772 A (see FIG. 1)

<Problem> If the arrangement of the air cleaner is changed, the intake flow rate may not be accurately measured by the air flow sensor.
Since the air flow sensor is installed in the middle of the intake pipe, if the air cleaner is changed, the shape of the air introduction pipe from the air cleaner changes, and the direction of the air flow measured by the air flow sensor changes. Although the flow rate is, the measured value of the air flow sensor changes, and the intake flow rate may not be accurately measured by the air flow sensor.

  An object of the present invention is to provide an intake device for an engine that can accurately measure the intake flow rate by an air flow sensor even if the arrangement of the air cleaner is changed.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1, in an intake system for an engine in which an air flow sensor (2) is disposed downstream of an air cleaner (1),
As illustrated in FIG. 1, a surge tank (3) is disposed downstream of the air cleaner (1), and an air introduction pipe (4) from the air cleaner (1) side is connected to one end of the surge tank (3). An air inlet guide tube (5) is provided, and an air outlet guide tube (6) to the downstream side is provided at the other end,
As illustrated in FIG. 1, the surge tank (3) is formed between a pair of opposed walls (7) and (8) facing each other and the peripheral edges of the pair of opposed walls (7) and (8). And an air inlet guide tube (5) on the one side facing wall (7), and the axis (5a) of the air inlet guide tube (5) is connected to the inner surface of the other side facing wall (8). Toward (8a), the inner surface (8a) of the other opposing wall (8) was introduced from the air inlet guide tube (5) along the direction perpendicular to the axis (5a) of the air inlet guide tube (5). Causing air (10) to collide with the inner surface (8a) of the other opposing wall (8) in a direction perpendicular thereto,
As illustrated in FIG. 1, an air outlet guide tube (6) is provided on the peripheral wall (9), and the axis (6a) of the air outlet guide tube (6) is connected to the inner surface (8a) of the other opposing wall (8). ), And an air flow sensor (2) attached to the air outlet guide tube (6).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> Even if the arrangement of the air cleaner is changed, the intake flow rate can be accurately measured by the air flow sensor.
As illustrated in FIG. 1, when the arrangement of the air cleaner (1) is changed, the shape of the air introduction pipe (4) from the air cleaner (1) side is changed, but the air inlet guide cylinder ( The air (10) flowing into the surge tank (3) via 5) collides in the direction perpendicular to the inner surface (8a) of the other side facing wall (8), and the inner surface (8a) of the other side facing wall (8). ) Spreads in the surge tank (3) in the direction along the inner wall (8), and then flows into the air outlet guide tube (6) in the direction along the inner surface (8a) of the other facing wall (8).
For this reason, even if the arrangement of the air cleaner (1) changes, the flow direction of the air (10) flowing into the air outlet guide tube (6), and hence the flow direction of the air (10) measured by the air flow sensor (2) The intake flow rate can be accurately measured by the air flow sensor (2).

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> The intake flow rate can be measured more accurately by the air flow sensor.
As illustrated in FIG. 1, a rectifying plate (11) is disposed in the surge tank (3), and the air (10) passing through the surge tank (3) by the rectifying plate (11) is supplied to an air outlet guide cylinder ( Since the direction parallel to the axis (6a) of 6) is aligned, the air (10) measured by the air flow sensor (2) is rectified, and the intake flow rate is measured more accurately by the air flow sensor (2). be able to.

It is a figure explaining the engine intake device which concerns on embodiment of this invention. It is a top view of the engine provided with the air intake device of FIG.

  FIGS. 1 to 2 are diagrams for explaining an intake device for an engine according to an embodiment of the present invention. In this embodiment, an intake device for a vertical in-line multi-cylinder engine will be described.

As shown in FIG. 2, in this engine, a cylinder head (15) is assembled to the upper part of the cylinder block, a head cover (16) is assembled to the upper part of the cylinder head (15), and an engine cooling fan (17 ) And a flywheel housing (18) is arranged at the rear of the cylinder block.
An intake manifold (19) is assembled on one side of the cylinder head (15), an exhaust manifold (20) is assembled on the other side, and a supercharger (21) is assembled on the exhaust manifold (20). The intake manifold (19) is supercharged from the compressor (22) of (21) via the supercharging pipe (23).

The structure of the intake device of this engine is as follows.
As shown in FIG. 1, an air flow sensor (2) is disposed downstream of the air cleaner (1).
A surge tank (3) is arranged downstream of the air cleaner (1), and an air inlet guide cylinder (5) for connecting an air introduction pipe (4) from the air cleaner (1) side to one end of the surge tank (3). The other end is provided with a downstream air outlet guide tube (6).

  The surge tank (3) includes a pair of opposed walls (7), (8) facing each other, and a peripheral wall (9) formed between the peripheral edges of the pair of opposed walls (7), (8). The air inlet guide tube (5) is provided on the one side facing wall (7), the axis (5a) of the air inlet guide tube (5) is directed to the inner surface (8a) of the other side facing wall (8), The inner surface (8a) of the side facing wall (8) is aligned along the direction orthogonal to the axis (5a) of the air inlet guide tube (5), and the air (10) introduced from the air inlet guide tube (5) is placed on the other side. It is made to collide with the direction orthogonal to the inner surface (8a) of an opposing wall (8).

  An air outlet guide tube (6) is provided on the peripheral wall (9), and the axis (6a) of the air outlet guide tube (6) is oriented in a direction parallel to the inner surface (8a) of the other opposing wall (8). The air flow sensor (2) is attached to the air outlet guide tube (6).

  The air flow sensor (2) is also called an air flow meter and uses a hot wire detection type. The air flow sensor (2) may be a vane, Karman vortex, hot wire, hot film, or the like depending on the detection method, but any method may be used.

The surge tank (3) is a hexagonal box-shaped casting, and the air inlet guide tube (5) is integrally molded from the corner on one end of the horizontal one-side facing wall (7) to stand in the vertical direction. The air outlet guide cylinder (6) is led out horizontally from the corner of the peripheral wall (9) by integral molding.
As shown in FIG. 2, the peripheral wall (9) of the surge tank (3) gradually increases in width from one end side with the air inlet guide tube (5) to the other end side with the air outlet guide tube (6). After expanding and maintaining a certain width, the width gradually narrows.
An air outlet pipe (24) to the compressor (22) of the downstream supercharger (21) is connected to the air outlet guide tube (6).
The surge tank (3) is arranged in a horizontal posture on the upper part of the engine, but may be arranged in a posture perpendicular to the side, rear and front sides of the engine.

As shown in FIG. 1, a rectifying plate (11) is arranged in the surge tank (3), and the air (10) passing through the surge tank (3) by the rectifying plate (11) is supplied to the air outlet guide cylinder (6). ) In a direction parallel to the axis (6a).
The rectifying plate (11) is a flat plate made of punching metal, arranged in a partition shape in a direction perpendicular to the inner surface (8a) of the other opposing wall (8), and the direction of each air passage hole (25) is an air outlet guide. The direction is parallel to the axis (6a) of the cylinder (6).

(1) Air cleaner
(2) Air flow sensor
(3) Surge tank
(4) Air introduction pipe
(5) Air inlet guide tube
(5a) Axis
(6) Air outlet guide tube
(6a) Axis
(7) One side facing wall
(8) Opposite wall
(8a) Inner surface
(9) Perimeter wall
(10) Air
(11) Current plate

Claims (2)

In an intake system for an engine in which an air flow sensor (2) is arranged downstream of an air cleaner (1),
A surge tank (3) is arranged downstream of the air cleaner (1), and an air inlet guide cylinder (5) for connecting an air introduction pipe (4) from the air cleaner (1) side to one end of the surge tank (3). Provided with an air outlet guide tube (6) to the downstream side at the other end,
The surge tank (3) includes a pair of opposed walls (7), (8) facing each other, and a peripheral wall (9) formed between the peripheral edges of the pair of opposed walls (7), (8). The air inlet guide tube (5) is provided on the one side facing wall (7), the axis (5a) of the air inlet guide tube (5) is directed to the inner surface (8a) of the other side facing wall (8), The inner surface (8a) of the side facing wall (8) is aligned along the direction orthogonal to the axis (5a) of the air inlet guide tube (5), and the air (10) introduced from the air inlet guide tube (5) is placed on the other side. Collide in the direction perpendicular to the inner surface (8a) of the opposing wall (8),
An air outlet guide tube (6) is provided on the peripheral wall (9), and the axis (6a) of the air outlet guide tube (6) is oriented in a direction parallel to the inner surface (8a) of the other opposing wall (8). An air intake sensor for an engine, wherein an air flow sensor (2) is attached to the air outlet guide tube (6). The engine intake device according to claim 1, wherein
A rectifying plate (11) is arranged in the surge tank (3), and the air (10) passing through the surge tank (3) by the rectifying plate (11) is connected to the axis (6a) of the air outlet guide tube (6). An engine intake system characterized by being aligned in parallel directions.

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