JPH03149326A - V type internal combustion engine - Google Patents

Abstract

PURPOSE:To make a valve openly and closely driven approach an intake port by arranging an actuator at the position facing an intake passage extending from one side of surge tank between adjacent intake passages. CONSTITUTION:V valve opening/closing system formed of actuators 11 and the like are provided at an upper part of a V bank, one by one. The actuator 11 is arranged between adjacent intake passages 5, 6, and at the position facing the long intake passage 5 which extends from one surge tank 2 on the other side thereof to another surge tank 2 on the same side thereof. A connection point (a) of a lever of a link connected to a rod of the actuators 11 is arranged at the down side of the long intake passage 5, and positioned between adjacent intake ports 7(8), 8 of cylinders. A valve 9 openly and closely driven by the actuator 11 is made as much as possible to approach the intake port 8 without preventing compactness of an engine 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a V-type internal combustion engine in which part of the intake passage is opened and closed depending on the rotational speed.

(Prior art) In such a V-type internal combustion engine, for example, one of the two intake passages for each cylinder is closed in the low-to-medium speed range, and the same intake passage is opened in the high-speed range to ensure a sufficient amount of intake air. However, the intake passage is opened and closed by a valve driven by an actuator that is linked to the rotational speed. Note that negative pressure in a surge tank or the like is used as a driving source for the actuator.

However, in consideration of the responsiveness of intake air to the opening and closing of the valve, it is desirable to bring the valve as close as possible to the intake port and shorten the length of the intake passage connecting the valve and the intake port.

(Problems to be Solved by the Invention) 1 However, in order to move the valve closer to the intake port, the actuator that drives the valve must be installed protruding from the side of the engine, which impedes the ability to make the engine more compact. It ends up.

Conventionally, a valve has been installed at the connection part of the intake passage to the surge tank, for example, but this increases the length of the intake passage connecting the valve and the intake port.
The responsiveness of the intake air to opening and closing of the HARTZ becomes worse.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to bring the valve as close to the intake port as possible without hindering the downsizing of the engine by rationally arranging the actuator, and to control the opening and closing of the valve. An object of the present invention is to provide a V-type internal combustion engine that can improve intake responsiveness.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides: ■ A pair of left and right surge tanks are arranged above the bank, and one of the intake passages extending from each surge tank to each cylinder is connected to the same side of the intake passage. connect to the port,
The other is connected to an intake port on the other side, and one of the intake passages connected to each cylinder is opened and closed by a valve driven by an actuator linked to rotational speed. A pair of actuators are provided on the left and right sides of the V bank, and each actuator is located between adjacent intake passages and facing the intake passage extending from the surge tank on the other side toward the surge tank on the same side. Its feature is that the connection point between the actuator lot and the valve shaft is located between the intake ports 1 to 1 of adjacent cylinders.

(Function) According to the present invention, since the actuator is arranged compactly between the pair of left and right surge tanks on the V bank,
In addition to making the engine more compact, the valves that are driven to open and close by the actuator are placed as close to the intake port as possible, thereby shortening the intake passage that connects the valve and the intake port. Responsiveness is increased.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a plan view of a V-type internal combustion engine according to the present invention, and FIG.
3 is a partially cutaway front view of the actuator mounting portion of the same engine, FIG. 3 is a cutaway plan view showing a valve opening/closing mechanism by the actuator, and FIG. 4 is a sectional view taken along the line N-ff in FIG. 3.

The basic structure of the V-type internal combustion engine 1 will be explained based on FIG. 1 and FIG. A surge tank 2゜2 is installed. and,
One end of these surge tanks 2.2 is the throttle body 3
The other ends are connected to each other through a passage 4.

Note that a throttle valve (not shown) is accommodated in the throttle body 3.

Also, inside the surge tanks 2, 2, a total of 6 cylinders, 3 each, are arranged in parallel in the lower hunks of these tanks, and from the inside of each surge tank 2, long and short intake passages 5,
Each long intake passage 5 is connected to the intake port of the cylinder arranged in the V bank on the other side, and each short intake passage 6 is connected to the intake port of the cylinder arranged in the V bank on the same side. It is connected to the intake port 8 of.

By the way, as shown in detail in FIGS. 3 and 4, the short intake passages 6 connected to the intake ports 8 of the three cylinders arranged in each V bank are connected to the valves 9. These valves 9... are attached to a common valve shaft 10, and are driven by a diaphragm type actuator 11. That is,
Connected to the valve shaft 10 are two levers 12.12, to which circular links 13 are attached.
The free ends of are connected. A slot 14 extending from the actuator 11 is provided in the middle part of the link 13.
The ends of are connected. The actuator 11 has two chambers S, , S formed by a tire plum (not shown). One chamber S is compressed by a spring (not shown), which pushes the rod 14 in the direction of arrow A in FIG. As shown, it is kept in the open state, and at this time, the end 12a of each lever 12 is in contact with the stopper 15. One chamber S□ in the actuator 11 is connected to the surge tank 2.
, 2, and the other chamber S2 is communicated with the atmosphere.

As shown in FIG. 1, one valve opening/closing mechanism consisting of actuators 11 and the like is provided above each V bank, and in each valve opening/closing mechanism, the actuators 11 are connected to It is arranged between the intake passages 5.6 and at a position facing the long intake passage 5 extending from the surge tank 2 on the other side toward the surge tank 2 on the same side, as shown in FIG. It is attached to the cylinder head cover 16 via a bracket 17 and bolts 18. Each connection point a of the link 13 connected to the rod 14 of each actuator 11 and the lever 12.12 is located below the long intake passage 5 and in the intake air of the adjacent cylinder, as shown in FIG. Port 7 (8
) and 8.

As a result of the above, since the actuators 11.11 are arranged compactly between the pair of left and right surge tanks 2.2 on the V-bank of the engine l, each actuator 11 can be opened and closed without hindering the compactness of the engine l. In this embodiment, as shown in FIG. It is placed near the connection part.

In FIG. 2, 21 is an intake valve that opens and closes the intake port 8 at appropriate timing, 22 is a cam that drives the intake valve 21, 23 is an exhaust passage formed in the cylinder radius 19, and 24 is the exhaust valve. This is an exhaust valve that opens and closes the passage 23 at appropriate timing.

In this VFFI internal combustion engine, the surge tanks 2, 2 are located downstream of the throttle valve, so in the low and medium speed ranges where the opening of the throttle valve is small, the surge tank 2.2 has a high Negative pressure is generated, and this negative pressure is applied to the chamber S□ of the actuator 11 of each valve opening/closing mechanism.
guided within. When a high negative pressure is introduced into the chamber S1 of the actuator 11, the rod 14 connected to a diaphragm (not shown) moves into the chamber S against the elastic force of the spring compressed inside the chamber S1, as shown by the arrow in FIG. It is pulled in direction B. Then, when the rod 14 is pulled, the lever 12°12 and the valve shaft 10
and the valves 9... rotate in the direction of arrow C in FIG. 4, and the short intake passages 6... are closed by the valves 9... as shown by chain lines in FIG. As a result, in the low/medium speed range, intake air is supplied to each cylinder from the longer intake passage 5 through the surge tank 2.2 and is used for combustion. At this time, the end of each lever 12, 12b (fourth
(see figure) is in contact with a stopper (not shown).

On the other hand, in the high-speed range where the opening degree of the throttle valve is large, the negative pressure generated in the surge tank 2.2 is small, so the lot 14 is activated by the elastic force of the spring compressed in the chamber S1 of the actuator 11. 4 in the direction of arrow A, thereby opening the valves 9 as described above. As a result, in the high speed range, the intake air flows through the entire intake passage 5-.

6... is supplied to each cylinder and subjected to combustion.

In this embodiment, since the actuator 11.11 constituting the valve opening/closing mechanism is compactly arranged between the pair of left and right surge tanks 2.2 on the V bank,
The valves 9--, which are driven to open and close by each actuator 1, without hindering the compactness of the engine 1, are
As mentioned above, the intake bow) can be made as close as possible to 8-... (see Figure 2), and as a result, each valve 9
The distance between the intake port 8 and the intake port 8 is shortened, and the response of intake air to the opening and closing of each valve 9 is enhanced.

In the above embodiment, the actuator 11°11 was attached to the cylinder to the rad cover 1-6, but for example, the third
It may also be attached to the aluminum valve housing 25 shown in the figure.

(Effects of the Invention) As is clear from the above description, according to the present invention, ■ A pair of left and right surge tanks are arranged above the bank, and the - side of the intake passage extending from each surge tank to each cylinder is connected to the same side of the intake passage. The V-type internal combustion engine is connected to the intake port on the other side, and one side of the intake passage connected to each cylinder is opened and closed by a valve driven by an actuator linked to the rotational speed. In the engine, a pair of actuators are provided on the left and right sides of the V bank, and each actuator is located between adjacent intake passages and faces an intake passage extending from a surge tank on the other side toward a surge tank on the same side. In addition, since the connection point between the rod of each actuator and the valve shaft is placed between the intake ports of adjacent cylinders, the valves that are driven to open and close by the actuator can be opened and closed without hindering the downsizing of the engine. This has the effect of being able to be placed as close to the intake port as possible, shortening the intake passage connecting the valve and the intake port, and improving the response of intake air to the opening and closing of the valve.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a V-type internal combustion engine according to the present invention, and FIG.
3 is a partially cutaway front view of the actuator mounting portion of the same engine, FIG. 3 is a cutaway plan view showing a valve opening/closing mechanism by the actuator, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. 1-V-type internal combustion engine, 2--surge tank, 5--low intake passage, 7.8--intake port, 9--valve, io--valve shaft, 11--actuator.

Claims (1)

[Claims] A pair of left and right surge tanks are arranged above the V-bank, and one of the intake passages extending from each surge tank to each cylinder is connected to the intake port on the same side, and the other is connected to the intake port on the other side. In a V-type internal combustion engine in which one of the intake passages connected to the engine is opened and closed by a valve driven by an actuator that is linked to the rotational speed, a pair of actuators are provided on the left and right sides of the V bank, and each actuator is arranged adjacent to each other. It is located between the intake passages and facing the intake passage extending from the surge tank on the other side toward the surge tank on the same side, and the connection point between the rod of each actuator and the valve shaft is located adjacent to the intake passage. A V-type internal combustion engine characterized by being placed between the intake ports of two cylinders.