JP2915030B2 - Engine intake system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an intake device for an engine having a line of cylinders, and more specifically, a so-called multiple throttle structure in which a throttle valve is provided for each intake pipe to each cylinder. About.

[Prior art and its problems] In an internal combustion engine such as a gasoline engine, a throttle valve is provided in an intake passage for supplying an air-fuel mixture into a cylinder, and the amount of air-fuel mixture sucked into the cylinder is controlled by opening and closing the throttle valve. The output is variably adjusted by adjusting.

Generally, a throttle valve is a so-called butterfly type in which a valve plate having substantially the same shape as the diameter of the intake passage is rotatably supported in the intake passage, and the passage is opened and closed by the rotation of the valve plate. .

In the case of a multi-cylinder engine, the throttle valve is usually provided upstream of the position where the cylinder branches into the intake passage for each cylinder of the intake manifold. According to this configuration, only one throttle valve is required regardless of the number of cylinders.

On the other hand, in high-power type engines that give priority to performance,
Some throttle valves are provided in each intake passage to each cylinder in order to obtain a good response (hereinafter referred to as multiple throttles). Such multiple throttles are connected to the intake manifold and the engine body (cylinder head). Between, or between the two divided in the intake manifold extension direction,
It is configured with a throttle body interposed.

There are various possible configurations of the throttle body, such as a separate body for each intake pipe, or connecting and integrating the individual intake pipes, but from the viewpoint of assembly workability and cost, there are various types of throttle bodies. It is desirable that

By the way, as one of the arrangements of multi-cylinder cylinders in a vehicle engine, there is a so-called V type in which cylinders are arranged in a V-shape as disclosed in Japanese Utility Model Laid-Open No. 5330/1986. According to this, the intake ports are provided on the opposite sides of both banks, respectively, and the intake manifold is disposed between the left and right banks.

Here, in the case where the V-type engine in which the intake manifold is disposed between the left and right banks is to be provided with multiple throttles, if the throttle body is integrated into each bank, the pivot shaft of the valve plate is rotated. It becomes difficult to provide a belling that movably holds and a seal member for preventing communication between the cylinders through a pivot shaft fitting hole,
Therefore, an independent throttle body must be provided for each intake pipe. However, in this case, the number of parts is increased, and time is required for the assembling work, which leads to an increase in cost. Further, there is a problem that the balance adjustment of each cylinder is troublesome and the serviceability at the time of maintenance is extremely poor.

[Object of the Invention] In view of the circumstances described above, the present invention provides an intake system for an engine that can be configured with a small number of parts, is excellent in assembling workability and serviceability, and can reduce the cost of a V-type engine to multiple throttles. It is intended to provide a device.

Therefore, an intake device for an engine according to the present invention is an intake device for a V-shaped engine in which a plurality of cylinder rows are arranged side by side in a left and right bank. The intake pipes of the respective cylinders are arranged adjacent to each other through a space on the downstream side of the intake air for each cylinder row of each of the left and right banks, and the cylinders of the respective cylinder rows of the right and left banks on the intake upstream side. Each intake pipe is arranged in a line in the cylinder row direction between the left and right banks, and the intake pipes of the left and right banks are integrated so as to be adjacent to each other to form an intake pipe pair.
On the downstream side of the pair of intake pipes, a plate-shaped intake throttle valve interposed in each intake pipe, a pivot for rotating the throttle valve, and an intake pipe for holding the pivot are provided. And a bearing portion provided at a portion corresponding to the space portion.

This makes it possible to mount a belling or a seal for holding the pivot shaft of the valve plate of the throttle valve, and to connect the respective pivot shafts in an interlockable manner. To the upstream intake system parts such as surge tanks to make assembly parts.Thus, the throttle valve opening of each cylinder can be adjusted before assembly to the engine body. Sex is greatly improved.

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

FIG. 1 is a cross-sectional view of a cylinder head portion of a V-type six-cylinder engine to which an intake device for an engine according to the present invention is applied, and FIG. 2 is a plan view of an intake manifold 20 thereof.

On the side surfaces of the right bank cylinder head 10R and the left bank cylinder head 10L that face each other, there are opened intake ports 11, 11 communicating with the combustion-disappearing upper surface forming portions of the lower surfaces, respectively. The intake manifold 20 is attached to the opening, and the left and right cylinder heads 10L, 10
R is connected and integrated by the intake manifold 20. Upstream side (upper side) of intake manifold 20
Are connected to the surge tanks 30R, 30L of each bank via branch passages 31 for each cylinder.

The intake manifold 20 is formed by joining independent intake pipes 20R and 20L, which are respectively connected to the intake ports 11 and 11 of adjacent cylinders between the aligned left and right cylinder rows, at adjacent side surfaces to form an intake pipe. A pair 21 is formed, and a plurality of intake pipe pairs 21 (three pairs in this embodiment, which are V-type six cylinders) arranged in the longitudinal direction (cylinder arrangement direction) of the engine are connected and integrated via a connection part 22. It is configured.

The respective intake pipes 20R and 20L constituting the intake pipe pair 21 are arranged in the vertical direction such that the center of the opening on the upstream side coincides with the center line between the banks, and as viewed from the longitudinal direction of the engine, as shown in FIG. It overlaps on the upstream side, and has an inverted V-shape that spreads right and left as it goes downward from the overlap position (as it approaches the left and right cylinder heads 10L and 10R). A surge tank 30 is provided at the upper part of the intake pipe pair 21 and at the upstream opening of the intake pipes 20R and 20L.
A flange 21B for connecting the branch passages 31 of R and 30L is formed.

Butterfly type throttle valves 40 are mounted near the mounting portions of the intake pipes 20R, 20L to the cylinder heads 10L, 10R, respectively, with their pivot shafts 41 parallel to the cylinder arrangement direction (that is, the vertical direction of the engine). Further, a fuel injection valve 50 is disposed adjacent to the throttle valve 40 on the cylinder head 10 side.

As shown in FIG. 2, both ends of the pivot shaft 41 of each throttle valve 40 are mounted on bearings 23A of a casing 21A of the intake pipe pair 21.
And the intake pipes 20R, 20L
It can rotate smoothly while maintaining airtightness inside and outside.

The pivot shafts 41 of the throttle valves 40 of one bank (the right side in the figure) are connected via an adjustment mechanism 42 in an interlockable manner, and each of the pivot shafts 41 is connected to an intake pipe pair. Throttle valve 40 of the other bank constituting 21 ...
Are connected so as to be able to interlock with each other via a connecting link 43. Further, a pivot shaft 41 of a throttle valve 40 on the left side of the central intake pipe pair 21 is connected via a throttle link 45 to a throttle lever 44 rotatably supported below the surge tank 30L. When the throttle lever 44 is rotated by an accelerator wire (not shown), all the throttle valves 40 are opened and closed in conjunction with each other.

According to the above configuration, the intake pipes 20R and 20L to the adjacent cylinders between the left and right cylinder rows are joined and integrated to form the intake pipe pair 21, so that the pivot shaft 41 of each throttle valve 40. 21 can be held via a bearing 23 and a seal 24, respectively, and the degree of opening of the throttle valves 40 can be adjusted at the connection between the pivot shafts 41. In this embodiment, each pair of intake pipes 21 is connected to a connecting portion 22.
, The intake manifold 20 is configured, so that the degree of opening of each of the throttle valves 40 can be adjusted in the state of the intake manifold 20. Therefore.
It can be mounted on the engine body (cylinder head) in an adjusted state, and the assembly workability is extremely good.
It should be noted that each of the intake pipe pairs 21 must not be integrally formed by connecting with the connecting portions 22. Instead, the intake pipe pairs 21 are assembled into an intake system component (surge tank or the like) on the upstream side. Has the same effect.

[Effects of the Invention] As described above, according to the engine intake device of the present invention, the number of parts can be reduced with respect to the configuration in which the valve bodies of the individual intake pipes are interposed. It is excellent in serviceability and makes it possible to use V-type engines with multiple throttles at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a V to which an intake device for an engine according to the present invention is applied.
FIG. 2 is a cross-sectional view of a cylinder head portion of the type engine, and FIG. 2 is a plan view of the intake manifold. 10 Cylinder head (engine body) 20 Intake manifold 20L, 20R Intake pipe 21 Inlet pipe pair 40 Throttle valve

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kiyotaka Mamiya 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Co., Ltd. (56) References JP-A-60-62654 (JP, A) JP-A-63 -277828 (JP, A) JP-A-61-201824 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02M 35/116

Claims (1)

(57) [Claims] An intake device for a V-shaped engine in which a plurality of cylinder rows are arranged in a left and right bank in a left and right bank, wherein an independent intake pipe is provided for each cylinder in the left and right bank cylinder rows. In each of the cylinder rows of the left and right banks, the intake pipes of the respective cylinders are adjacent to each other via a space portion, and the intake pipes of the respective cylinders of the respective cylinder rows of the left and right banks are arranged between the left and right banks on the intake upstream side. The intake pipes of the left and right banks are integrated so as to be adjacent to each other so as to form a pair of intake pipes. A plate-like plate interposed in each intake pipe on the downstream side of the intake pipe pair. An intake throttle valve, a pivot shaft for rotating the throttle valve, and a bearing portion provided at a portion corresponding to a space of the intake pipe for holding the pivot shaft. An intake system for an engine, characterized by