JP5077568B2 - Engine intake system - Google Patents

Description

  The present invention relates to an engine intake device mounted on a front portion of a vehicle with a cylinder row directed in a vehicle width direction.

  In Patent Document 1, an intake manifold is attached to a rear portion of an engine mounted on a front portion of a vehicle with a cylinder row directed in a vehicle width direction, and an intake duct, an air cleaner, and a resonator disposed in an upstream intake passage of the intake manifold. The structure which arrange | positions intake parts, such as these, above the engine and the auxiliary machine attached to the side part of this engine is proposed. According to this arrangement, there is no need to assemble the intake components of the intake device to a vehicle body, the assembly of the intake system is enhanced.

Patent Document 2 proposes a configuration in which the intake manifold is connected to the engine via a support member such as a bracket or a stiffener in order to prevent vibration of the intake manifold.
Japanese Patent Laid-Open No. 10-213034 JP 2002-256990 A

  However, in the configuration proposed in Patent Document 1, since the intake manifold is not cooled by the cooling air, the temperature of the intake air supplied to the engine through the intake manifold is high and the density is low, so the charging efficiency is low. There is a problem that the engine output is reduced.

  Further, in the configuration proposed in Patent Document 2, since the support member does not have a structure that actively guides the cooling air to the intake manifold, the intake manifold and the intake air flowing therethrough are not cooled, and these temperatures are high. Therefore, there is a similar problem that causes a decrease in engine output.

  The present invention has been made in view of the above problems, and an object thereof is to provide an engine intake device capable of reducing vibrations and lowering intake air temperature to improve engine output. is there.

In order to achieve the above object, according to a first aspect of the present invention, a cylinder head and a head cover are attached to an upper portion of an engine mounted with a cylinder row facing a vehicle width direction at a front portion of the vehicle, and an intake manifold is provided at a rear portion of the cylinder head. is attached, said mounting auxiliary equipment in the vehicle width direction end portion of the cylinder head, the air cleaner is connected via an intake passage into the intake manifold is disposed so as to cover the upper part of the auxiliary and the head cover, the In an intake system for an engine in which an intake manifold is connected to the cylinder head by a support member,
An end portion in the vehicle width direction of the intake manifold protrudes rearward of the auxiliary machine, and extends in the vehicle front-rear direction along the vehicle width direction end portion of the engine between the air cleaner and the auxiliary machine. forming a space portion facing the, with disposing the linear of the support member in the space portion, erected upward from the vehicle width direction outer end of the horizontal wall and the horizontal wall to said support member longitudinal wall forming a said to extend between the horizontal wall from lateral side in the vehicle width direction of the cylinder head to the front portion of the intake manifold, the inboard portion connected to the cylinder head, the vehicle rear side end portion Is raised obliquely upward and connected to the front portion of the intake manifold, and the vertical wall extends from the side of the cylinder head to a position close to the front portion of the intake manifold. .

  According to a second aspect of the present invention, the vehicle according to the first aspect of the present invention is configured so that the front surface portion of the intake manifold passes through a connection point of the support member to the intake manifold in a plan view with respect to a straight line extending in the vehicle width direction. It is characterized by tilting backward.

  According to the first aspect of the present invention, in addition to shortening the overall length of the support member by making it linear, the rigidity of the support member is enhanced by the horizontal wall and the vertical wall orthogonal to each other. Since bending deformation is suppressed, vibration of the intake device can be suppressed to a low level.

Further, when the vehicle is traveling, traveling wind is introduced into a space formed between the air cleaner and the auxiliary machine, and the traveling wind is guided to the front portion of the intake manifold along the horizontal and vertical walls of the support member. Since the manifold is used for cooling, the intake manifold and the intake air flowing through the intake manifold are cooled, and the density of the intake air is increased to increase the charging efficiency, thereby improving the engine output. In this case, the horizontal wall of the support member prevents the traveling wind from flowing downward, and the traveling wind flows inward in the vehicle width direction due to the vertical wall erected upward from the outer end in the vehicle width direction of the horizontal wall. Therefore, the intake manifold and the intake air flowing through the intake manifold are efficiently cooled.
According to the second aspect of the present invention, the traveling wind guided to the front portion of the intake manifold along the support member through the space formed between the air cleaner and the auxiliary machine is generated in the front portion of the intake manifold. Since the air flows to the rear side of the vehicle along the inclination, the intake air flowing through the intake manifold and the interior thereof is efficiently cooled by the traveling wind, thereby further improving the engine output.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a plan view of an engine room of a vehicle, FIG. 2 is a front view of an engine equipped with an intake device according to the present invention, FIG. 3 is a plan view of the engine with an air cleaner removed, and FIG. left sectional view of the engine (a-a line sectional view of FIG. 2), FIG. 5 is a left front perspective view of the engine showing the flow of the running wind.

  As shown in FIG. 1, a water-cooled three-cylinder engine 1 is mounted in the engine room 100 at the front of the vehicle in a horizontally placed state with the cylinder row directed in the vehicle width direction, and is arranged in the vehicle width direction at the front end of the vehicle. A radiator 3 is disposed on the lower left half of the upper cross member 2 formed. A cooling water outlet pipe 4 extending from the left side of the engine 1 is connected to the radiator 3, and a cooling water inlet pipe 5 extending from the right end of the radiator 3 is connected to the engine 1 to cool each part inside the engine 1. Then, the cooling water whose temperature has risen is introduced into the radiator 3 from the cooling water outlet pipe 4, cooled by heat exchange with the traveling wind in the radiator 3, and then introduced into the engine 1 for cooling each part. The cooling water circulates between the engine 1 and the radiator 3 to be used for cooling the engine 1. In FIG. 1, 6 the upper cross member connected pair of left and right second ends lamp support member, 7 is the center brace.

  As shown in FIG. 2, a cylinder head 9 is attached to the upper part of the cylinder block 8 of the engine 1, and the cylinder head 9 is covered with a head cover 10. An oil pan 11 is attached to the lower part of the cylinder block 8.

  As shown in FIGS. 2, 3 and 5, a cooling water housing 12 as an auxiliary device is attached to the left end of the cylinder head 9 of the engine 1, and the cooling water outlet is connected to the cooling water housing 12. The pipe 4 is led out.

  1 to 4, an air cleaner 13 is disposed above the engine 1 so as to cover the head cover 10 and the cooling water housing 12 (in FIG. 3, the air cleaner 13 is hatched). shown Te), as shown in FIGS. 1 and 2, the intake duct 14 in front of the air cleaner 13 is formed integrally. As shown in FIG. 2, one end of the intake duct 14 opens toward the right side of the vehicle, the other end branches vertically as branch pipes 14 a and 14 b, and the upper branch pipe 14 a is connected to the resonator 15. The lower branch pipe 14 b is connected to the inside of the air cleaner 13.

  As shown in FIG. 3, a throttle body 16 disposed behind the cylinder head 9 is connected to the center of the rear portion of the air cleaner 13 via the intake pipe 17 at the center in the vehicle width direction. It is connected to an intake manifold 18 arranged behind this. Then, the intake manifold 18 are connected to the three intake passages formed in the cylinder head 9 of the engine 1 (not shown). In the present embodiment, the intake manifold 18 is configured to include a surge tank integrally.

  Here, as shown in FIG. 3, the left end portion of the intake manifold 18 protrudes rearward of the cooling water housing 12, and an oblique line is shown in FIG. 2 between the air cleaner 13 and the cooling water housing 12. long space S in the longitudinal direction of the vehicle has been formed, the rear end of the space portion S is opened facing the intake manifold 18 as. And in this space part S, as shown in FIGS. 3-5, the stiffener 20 as a linear support member along a vehicle front-back direction is arrange | positioned.

The stiffener 20 connects the intake manifold 18 to the cylinder head 9 of the engine 1 and includes a horizontal wall 20a and a vertical wall 20b erected upward from an outer end in the vehicle width direction of the horizontal wall 20a. ing. Here, the horizontal wall 20a extends from the side of the cylinder head 9 to the front surface of the intake manifold 18, and as shown in FIG. 4, the rear end rises obliquely upward toward the rear. As shown in FIG. 3, the rear end portion is attached to the left side of the front portion of the intake manifold 18 by a bolt 21. As shown in FIG. 3, the stiffener 20 is attached to the cylinder head 9 on the engine 1 by bolts 22 and 23 at the inner side in the vehicle width direction of the horizontal wall 20a. An air cleaner 13 is attached by bolts 24.

  Further, as shown in FIGS. 3 to 5, the vertical wall 20 b of the stiffener 20 extends from the side of the cylinder head 9 to a position close to the front surface portion of the intake manifold 18.

  In the present embodiment, as shown in FIG. 3, the front surface of the intake manifold 18 extends in the vehicle width direction through a connection point a to the intake manifold 18 at the rear end of the stiffener 20 in plan view. It is arranged obliquely with respect to the straight line L so as to be inclined at a predetermined angle θ toward the vehicle rear side.

  Thus, the intake device according to the present invention includes the intake duct 14, the air cleaner 13, the intake pipe 17, the throttle body 16 and the intake manifold 18 described above. The engine 1 including the intake device is started. Then, the outside air (intake air) is drawn into the intake duct 14 due to the negative pressure generated in each cylinder of the cylinder head 9, and this outside air (intake air) passes through the branch pipe 14 b of the intake duct 14 to the air cleaner 13. be introduced.

The intake air introduced into the air cleaner 13 is purified by passing through a filter element (not shown) provided in the air cleaner 13, then flows into the throttle body 16 through the intake pipe 17, and is built in the throttle body 16. After being measured by the throttle valve (not shown) , the air flows to the intake manifold 18 and is supplied from the intake manifold 18 to the intake passage (not shown) of the cylinder head 9. An appropriate amount of fuel is injected into the intake air from an injector 25 (see FIG. 3) attached to the cylinder head 9 to form a desired air / fuel ratio (A / F) mixture. The head 9 is used for the young in a combustion chamber (not shown) of the angular cylinder. Thereafter, the same operation as described above is repeated, and the engine 1 is continuously operated.

  Thus, during traveling of the vehicle, as shown by arrows in FIGS. 3 to 5, traveling wind from the front of the vehicle is introduced into the space S formed between the air cleaner 13 and the cooling water housing 12. The traveling wind is guided to the front portion of the intake manifold 18 along the horizontal wall 20a and the vertical wall 20b of the stiffener 20 to be used for cooling the intake manifold 18, and thus flows through the intake manifold 18 and the inside thereof. intake air is cooled, the charging efficiency is increased is lowered density of the intake is thereby improved output of the engine 1 is achieved. In this case, the horizontal wall 20a of the stiffener 20 prevents the traveling wind from flowing out downward, and the traveling wind is directed in the vehicle width direction by the vertical wall 20b erected upward from the outer end in the vehicle width direction of the horizontal wall 20a. since flows inwardly directed to the front portion of the intake manifold 18, intake air is efficiently cooled flowing intake manifold 18 and the interior.

  Further, in the present embodiment, as shown in FIG. 3, the air cleaner 13 is disposed such that the front portion thereof is inclined by a predetermined angle θ toward the vehicle rear side with respect to the straight line L in plan view. 12 travels along the stiffener 20 to the front surface of the intake manifold 18 along the stiffener 20 and flows toward the rear of the vehicle along the inclination of the front surface of the intake manifold 18. the traveling wind by flowing through the intake manifold 18 and the interior thereof inspiration further improvement in output of the engine 1 in order to be effectively cooled is achieved.

  Furthermore, in this embodiment, since the stiffener 20 has a linear shape, its overall length is shortened, and the rigidity of the stiffener 20 is enhanced by the horizontal wall 20a and the vertical wall 20b orthogonal to each other, so that bending deformation is suppressed. Therefore, the vibration of the intake manifold 18 and thus the entire intake device can be kept low.

  In the present embodiment, the embodiment in which the present invention is applied to the intake device of a three-cylinder engine in which three cylinders are arranged in parallel in the vehicle width direction has been described. It can of course be similarly applied to an intake system of any other multi-cylinder engine mounted toward the width direction.

It is a top view of the engine room of a vehicle. It is a front view of an engine provided with an intake device according to the present invention. It is a top view of an engine which removes and shows an air cleaner of an engine provided with an air intake device concerning the present invention. It is a left sectional view illustrating a flow of traveling wind engine with an intake apparatus according to the present invention (A-A line sectional view of FIG. 2). It is a left front perspective view which shows the flow of the driving | running | working wind of an engine provided with the intake device which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Upper cross member 3 Radiator 4 Cooling water outlet piping 5 Cooling water inlet piping 6 Lamp support member 7 Centab race 8 Cylinder block 9 Cylinder head 10 Head cover 11 Oil pan 12 Cooling water housing (auxiliary machine)
DESCRIPTION OF SYMBOLS 13 Air cleaner 14 Intake duct 14a, 14b Branch pipe of intake duct 15 Resonator 16 Throttle body 17 Intake pipe 18 Intake manifold 20 Stiffener (supporting member)
20a Horizontal wall of the stiffener 20b Vertical wall of the stiffener 21-24 Bolt 25 Injector 100 Engine room a Connection point of the stiffener to the intake manifold L Straight line extending in the vehicle width direction through the connection point a S Space portion θ The front surface of the intake manifold Angle of inclination

Claims (2)

Install the cylinder head and the head cover to the upper portion of an engine mounted with its cylinder banks in the vehicle width direction in the front part of the vehicle, it is attached to the intake manifold to the rear of the cylinder head, accessory in the vehicle width direction end portion of the cylinder head And an air cleaner connected to the intake manifold via an intake passage so as to cover the head cover and the auxiliary machine, and the intake manifold is connected to the cylinder head by a support member. In the intake system of
An end portion in the vehicle width direction of the intake manifold protrudes rearward of the auxiliary machine, and extends in the vehicle front-rear direction along the vehicle width direction end portion of the engine between the air cleaner and the auxiliary machine. forming a space portion facing the, with disposing the linear of the support member in the space portion, erected upward from the vehicle width direction outer end of the horizontal wall and the horizontal wall to said support member longitudinal wall forming a said to extend between the horizontal wall from lateral side in the vehicle width direction of the cylinder head to the front portion of the intake manifold, the inboard portion connected to the cylinder head, the vehicle rear side end portion Is raised obliquely upward and connected to the front portion of the intake manifold, and the vertical wall extends from the side of the cylinder head to a position close to the front portion of the intake manifold. Engine Intake system of.
The front surface portion of the intake manifold in a plan view is inclined toward the vehicle rear side with respect to a straight line extending in the vehicle width direction through a connection point of the support member to the intake manifold. Engine intake system.

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