JPH0746734Y2 - Engine intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an intake system for an engine, and more particularly to an intake system for improving output by a dynamic effect of intake air.

(Prior Art) As conditions for an intake passage device provided in an automobile engine, good intake efficiency over a wide rotation range from low speed to high speed, and even distribution of air-fuel mixture to each cylinder in a multi-cylinder engine Is required.

As an intake passage device provided in a conventional V-type 6-cylinder engine, for example, there is one shown in FIG.
(See JP 61-149519).

A collector housing 34 is disposed between the left and right cylinder rows 32, 33 of the engine 31 via a manifold block 38, and inside the collector housing 34, two collector portions 35, 36 are defined by a partition wall 37 extending in the cylinder row direction. Branch passages 41 to 46 that are independently formed and communicate with the combustion chamber 39 of each cylinder from the lower surfaces of the collector portions 35 and 36, and the communication passage 47 is formed on the upper surface of the collector housing 34. This communication passage 47 is formed in a U-shape through a partition wall 48, and openings 49 and 50 are formed at both ends of the communication passage 47 at the centers of the collector portions 35 and 36, respectively. An on-off valve 1 that operates according to operating conditions is arranged in the communication passage 47. In addition,
In the figure, 52 is an air cleaner, 53 is a throttle valve, 54 is a surge tank,
Reference numeral 55 is a fuel injection valve, and 56 is an intake valve.

When the engine speed is equal to or lower than a predetermined value, the on-off valve 51 is closed, each cylinder row 32, 33 is provided with an independent intake flow path, and resonates with the intake pressure pulsation having a relatively long wavelength in the low speed region, Inertial supercharging effect can be obtained.

When the rotation speed rises above a predetermined value, the on-off valve 51 opens and 2
The two collector portions 35, 36 are communicated with each other through the communication passage 47, and resonate with the intake pressure pulsation having a relatively short wavelength in the respective branch passages 41 to 46, so that the inertia supercharging effect is obtained in the high speed range.

(Problems to be solved by the invention) However, when such an engine 31 is mounted in a vehicle, the distance between the intake valve 56 and the collector housing 34 is limited by the size of the engine room, etc. It was difficult to secure a sufficient length of the passages 41 to 46.

In addition, the volume of the collector parts 35, 36 partitioned by the on-off valve 51 is different during low speed operation when the on-off valve 51 is fully opened, and the resonance supercharging effect varies between the left and right cylinder rows, and the on-off valve
When there is intake air flow between the collectors 35 and 36 via the communication passage 47 during high speed operation when 51 is fully opened, a difference in intake efficiency occurs between the left and right cylinder rows, which deteriorates operation stability. There was a problem.

The present invention aims to solve the above problems.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, in an intake passage device provided in a multi-cylinder engine having left and right cylinder rows facing each other in a V-shape, the combustion chambers of the left and right cylinder rows are independent. The intake port sections that communicate with each other are arranged so as to intersect in parallel with each other, and the two collector sections that connect the intake port sections are substantially parallel to each other so that the intake port sections are located inside both collector sections. The one collector part is bent so that its upstream end is adjacent to the other upstream end and faces the same direction, and the other end parts of the collector parts are communicated with each other via a communication passage, The communication passage and each collector portion are formed in a loop shape in substantially the same plane.

(Operation) A collector portion arranged substantially parallel to both sides of the intake port portion of the left and right cylinder rows, a bent portion of one of the collector portions, and a communication passage that connects the other end portion (downstream end) of each collector portion to each other is substantially Since they are arranged in a loop on the same plane, a sufficient passage length can be secured without increasing the size of the collector housing, and the overall height of the engine can be kept low.

Further, since one of the collector portions is bent so that its upstream end is adjacent to the other upstream end and faces the same direction, two throttle bores corresponding to each collector portion are connected to one throttle chamber. It is possible to integrally form the above into the above, and thereby the number of parts can be reduced.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

The collector housing 1 shown in FIGS. 1 and 2 is provided in a V-type 6-cylinder engine.
The intake ports open inside the left and right cylinder rows facing the mold,
The collector housing 1 is arranged between the left and right cylinder rows.
It should be noted that the ignition order is set so that the cylinders in which the intake strokes do not substantially overlap are arranged in each cylinder row.

The collector housing 1 is attached to a cylinder head of an engine through a manifold block (not shown), and has intake port portions 11 to 16 that branch independently into a combustion chamber of each cylinder. In the figure, the intake port portions 11, 12, 13 communicating with the combustion chambers of the left cylinder row and the intake port portions 14, 15, 16 communicating with the combustion chambers of the right cylinder row cross each other in parallel, and Arranged orthogonally to the cylinder row direction.

Collector part to connect each intake port part 11,12,13
21 and a collector section 22 for connecting the intake port sections 14, 15, 16 are provided, the collector section 21 for the left cylinder row is near the right cylinder row, and the collector section 22 of the right cylinder row is for the left cylinder row. Both collector parts should be located near each other.
21 and 22 are arranged in parallel with the cylinder row at a predetermined interval.

The upstream ends 21A and 22A of the collector parts 21 and 22 are adjacent to each other and are formed so as to be orthogonal to the cylinder row direction.
A flange portion 3 to which a throttle chamber (not shown) is attached is formed in the opening of the.

A communication passage 23 is formed in the collector housing 1 to connect the collector portions 21 and 22 in a loop shape, and the opening / closing valve 4 that opens and closes according to operating conditions is substantially equal to the throttle valve housed in the throttle chamber. It is arranged at the downstream end of the collector part 21 so as to partition the collector parts 21, 22 by the passage length and volume.

The collector housing 1 is integrally formed with a flange portion 5 which is joined to the manifold block. Flange part 5
The ribs 6 that integrally connect the front end portions of the outer walls of the intake ports 11 to 16 and the outer walls of the collector portions 21 and 22 are integrally formed with each other to secure sufficient strength.

The manifold block provided between the cylinder head and the cylinder head fixes the collector housing 1 through a bolt that penetrates a boss portion 7 formed in the middle of each rib 6, and the intake port portions 11 to 16 have equal passage lengths. The fuel injection valve is mounted in the middle of the flow path, which is connected to the intake valve of the cylinder head.

It is configured in this way, and the operation will be described next.

Intake air that has passed through the throttle chamber when the engine is operating is collected from the collectors 21 and 22 to the intake port 11
It is sucked into the combustion chamber of each cylinder through ~ 16.

Since the intake port portions 11, 12, 13 and 14, 15, 16 are arranged so as to intersect with each other, a sufficient length is secured without bending the intake port portions 11 to 16,
It is possible to properly set the length of the independent intake passage on the downstream side of the collector parts 21 and 22 while suppressing the intake resistance and preventing the response from deteriorating. The amount of intake air can be increased by increasing the inertia supercharging effect used.

Further, the collector portions 21 and 22 are connected by the loop-shaped communication passage 23, and the opening / closing valve 4 that operates according to operating conditions is arranged so as to be partitioned into a throttle chamber with substantially the same volume and passage length. It is possible to suppress variation in intake efficiency between the left and right cylinder rows due to the opening / closing operation of the opening / closing valve 4, and to obtain stable drivability in a wide operating range of the engine from a low speed range to a high speed range. .

Since the intake port portions 11 to 16 are arranged inside the collector portions 21 and 22 and the communication passage 23 is formed in a loop shape, it is possible to secure a sufficient passage length without increasing the size of the collector housing 1 and to improve the engine. Can contribute to keeping the overall height of the ship low.

By arranging the upstream ends 21A and 22A of the collector portions 21 and 22 adjacent to each other and in parallel, the throttle bores for accommodating the throttle valves are also arranged adjacent to each other and parallel to each other. Since it can be formed integrally with the chamber, the number of parts can be reduced.

(Effects of the Invention) As described above, according to the present invention, in the intake path device provided in the multi-cylinder engine having the left and right cylinder rows facing each other in the V-shape, each of the combustion chambers of the left and right cylinder rows communicates independently. The intake port portions are arranged so as to intersect with each other in parallel, and the two collector portions connecting the intake port portions are arranged substantially parallel to each other so that the intake port portions are located inside both collector portions. One collector portion is bent so that its upstream end is adjacent to the other upstream end and faces the same direction, and the other end portions of each collector portion are communicated with each other via a communication passage, and the collector passage and each of the communication passages are connected to each other. Since the collector part and the collector part are formed in a loop shape in substantially the same plane, the intake port part can be made sufficiently long to increase the intake efficiency without increasing the overall height of the engine. In addition, the cost can be reduced by reducing the number of parts in the throttle chamber.

Also, if an on-off valve that operates according to operating conditions is installed at a position where each collector section is partitioned by a throttle valve that is installed on the upstream side of the collector section with approximately the same volume, It is possible to suppress variation in intake efficiency between the left and right cylinder rows and obtain stable drivability in a wide operating range of the engine from a low speed range to a high speed range.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention. FIG. 2 is a side sectional view taken along the line BB of FIG. FIG. 3 is a side sectional view showing a conventional example, and FIG. 4 is a similar plane sectional view. 1 ... Collector housing, 4 ... On-off valve, 11-16 ... Intake port part, 21, 22 ... Collector part, 21A, 22A ... Upstream end,
23 ... Communication passage

Claims (2)

[Scope of utility model registration request] 1. An intake passage device provided in a multi-cylinder engine having left and right cylinder rows facing each other in a V-shape, wherein intake port portions independently communicating with the combustion chambers of the left and right cylinder rows intersect each other in parallel. The two collector parts that connect the intake port parts are arranged substantially parallel to each other so that the intake port parts are located inside the two collector parts, and one collector part has its upstream end connected to the other end part. It is bent so that it is adjacent to the upstream end and faces the same direction, and the other ends of the collector parts are communicated with each other through a communication path, and the communication path and each collector part are looped in substantially the same plane. An intake path device for an engine, which is formed into a shape. 2. A utility model registration request, characterized in that an on-off valve that operates according to operating conditions is provided at a position where each collector section is partitioned by a substantially equal volume with respect to a throttle valve provided upstream of the collector section. The intake system for an engine according to item 1 of the above.