JPH07102978A - Feeding device for v shaped engine - Google Patents

Abstract

PURPOSE:To prevent lowering of local torque in an intermediate rotational range by making length of a feeding pipe longer in a limited narrow engine room and also obtain a high engine torque in the whole rotational range of engine from a low rotational range through a high rotational range. CONSTITUTION:A collector 6 of designated length is mounted in a surge tank 1 by communicating with a feeding pipe 2 and the length of the feeding pipe 2 is made longer in a limited small engine room. Supercharging due to resonance effect is provided by mounting a plurality of air holes of designated size on the side face of the collector 6 and supercharging due to inertia effect of the air by reducing the air resistance by applying branching pipes having designated bore instead of the air holes and supercharging due to the inertia effect corresponding to air discharge is provided by mounting a means for adjusting air passage area of the branching pipe in the respective branching pipes mounted in the collector 6 and adjusting the passage area according to the air discharge. Thereby, a high torque from a low rotational range to a high rotational range can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a V-type engine air supply device.

[0002]

2. Description of the Related Art In an air supply system of an engine, at present, a change in air pressure caused by a state of a flow of combustion air is utilized to enhance filling of the engine with air (supercharging) to increase a high engine torque. Trying to get. It is known that the relationship between the change in air pressure and the engine torque is greatly affected by the length of the air supply pipe, as shown in FIG. That is, a curve A having a long air supply pipe
In the case of, the engine speed has a high torque in a low speed range and has a characteristic that the torque becomes low in a high speed range,
On the contrary, the curve B having a short length of the air supply pipe has characteristics that the torque is low in the low engine speed range and the torque is high in the high engine speed range.

The reason why the length of the air supply pipe influences the torque of the engine is that the amount of combustion air is small in the low engine speed range and the amount of combustion air is high in the high engine speed range. , The relationship between the engine speed and the amount of combustion air, and the supercharging effect uses the inertial effect of air due to the flow velocity of air and the resonance effect of pressure due to pressure fluctuation. This is because the relationship between the engine speed and the combustion air amount and the supercharging effect are organically related.

As shown in FIG. 7, a conventional V-type engine air supply device is provided with surge tanks 1 on both sides of an engine main body, an air supply pipe 2 is connected to the surge tank 1, and air is sucked from an air intake pipe 3. The air is guided to the surge tank 1 through the throttle body 4 and the air supply pipe 2, and is sucked into each cylinder by the intake manifold 5 connected to the surge tank 1.

[0005]

SUMMARY OF THE INVENTION In the above conventional example,
Even if you try to make the air supply pipe 2 as long as possible,
Since the inside of the engine room is narrow and it is necessary not to interfere with the cowl top, dash panel, etc., there is a limit to how long the air supply pipe 2 can be, and the curve A in FIG.
_As shown in ₁ , there is a problem that the engine torque is locally reduced in the vicinity of the middle-high speed rotation range A ₂ of the engine.

Further, as can be understood from FIG. 8, in order to obtain a high engine torque in the entire rotation range of the engine from the low speed range to the high speed range, air is supplied in accordance with the length of the air supply pipe 2 or the air amount. However, the conventional air supply pipe 2 does not have such a function and has a problem to be further improved.

According to the present invention, the length of the air supply pipe is increased in a limited narrow engine room to prevent a local decrease in torque in the middle speed range, and also to rotate the engine from a low speed range to a high speed range. (EN) A V-type engine air supply device which obtains a high engine torque over the entire rotational range of the region.

[0008]

[Means for Solving the Problems] A first means for solving the above problems is to provide surge tanks on both sides of a V-type engine, and connect an air supply pipe to the surge tanks.
In a V-type engine air supply device configured to supply combustion air to each cylinder via an intake manifold connected to the surge tank from the air supply pipe via a surge tank, the V-type engine is connected to the air supply pipe. It is characterized in that a collector of a predetermined length is provided in the surge tank,

The second means is characterized in that a plurality of air holes of a predetermined size are provided on the side surface of the collector, and the third means is an alternative to the air holes provided on the side surface of the collector provided in the surge tank. The fourth means is characterized in that a branch pipe having a predetermined inner diameter is provided, and the fourth means is characterized in that each branch pipe provided in the collector is provided with means for adjusting an air flow passage area of the branch pipe. Is.

[0010]

Since the present invention is constructed as described above, it has the following effects. That is, a surge tank is provided on both sides of the V-type engine, an air supply pipe is connected to the surge tank, and an intake manifold connected from the air supply pipe to the surge tank is connected to each cylinder for combustion. A V-type engine air supply device for supplying air, wherein a collector of a predetermined length is provided in the surge tank so as to communicate with the air supply pipe, so that the air supply pipe can be installed in a limited engine room. It is possible to increase the length.

By providing a plurality of air holes of a predetermined size on the side surface of the collector, the air can pass through the air holes at a flow velocity corresponding to the amount of air and be supercharged by both the inertia effect and the resonance effect of the air. Will be possible. Also, instead of the air holes provided on the side surface of the collector provided in the surge tank, it is possible to obtain a supercharging effect due to the inertial effect of air by reducing the air resistance by using a branch pipe with a predetermined inner diameter. Further, by providing each branch pipe provided in the collector with means for adjusting the air flow passage area of the branch pipe, the flow passage area is adjusted according to the air flow rate, and the inertia effect corresponding to the air flow rate is obtained. It becomes possible to supercharge by.

[0012]

EXAMPLE An example of the present invention will be described below. In FIG. 1, a collector 6 having a length L ₂ is provided in the surge tank 1.
To provide. As a result, in the limited narrow engine room, the air supply pipe 2 attached to the existing engine body,
It is possible to make the length of the air supply pipe 2 substantially L ₁ + L ₂ without changing the throttle body 4 and the intake manifold 5 and without changing the shape and size of the surge tank 1. As shown by the curve A (solid line) in FIG. 5, it is possible to prevent a local decrease in torque (dotted line portion) in the medium-high speed rotation region.

In the embodiment shown in FIG. 2, a long collector 6 is provided in the surge tank 1, and a plurality of air holes 7 are provided on the outer peripheral surface of the collector 6. The air hole 7 is provided toward the intake manifold 5 connected to the surge tank 1, so that the air guided to the surge tank 1 is uniformly sucked into the intake manifold 5. For example, as shown in FIG.
Different diameters such as ₂ and d ₃ and the inner diameter of the collector 6 d
Select _{1 so} that air is uniformly sucked into the intake manifold 5.

Also in the case of this embodiment, as in the embodiment shown in FIG. 1, the air supply pipe 2, the throttle body 4 and the intake manifold 5 mounted on the existing engine body are changed in a limited narrow engine room. Without changing the shape and size of the surge tank 1,
It is possible to increase the length of the air supply pipe 2 substantially.

When the air flow rate is small (low speed range)
Since the air supply pipe 2 is substantially long, the torque does not decrease and a large amount of air is sucked from the air hole 7 when the air flow rate becomes large (middle and high rotation range).
Pressure fluctuations occur due to air resistance when passing through the air holes 7, and supercharging due to the resonance effect becomes possible.

Next, in the embodiment shown in FIG. 4, a branch pipe 9 is provided in the collector 6 in place of the air hole 7 of the embodiment shown in FIG. That is, the branch pipe 9 is provided toward the intake manifold 5 connected to the surge tank 1, so that the air guided to the surge tank 1 is uniformly sucked into the intake manifold 5. There is. The branch pipes 9 have different diameters d ₁ , d ₂ , and d ₃ so that the intake manifold 5 can uniformly suck air.

When the air flow rate is small (low rotation range)
Since the air supply pipe 2 is substantially long, there is no decrease in torque, and when the air flow rate becomes large (middle and high rotation range), the air flows along the branch pipe 9 and the inertia force is applied to the air flow. Occurs, supercharging due to the inertial force effect becomes possible. Further, since the air flows along the branch pipe 9, the flow resistance is reduced and the inertial effect can be generated more effectively. Although not shown, each branch pipe 9
An adjusting means such as a damper is provided to adjust the flow passage area, and by adjusting the flow passage area according to the air flow rate (engine speed), the inertial effect corresponding to the air flow rate can be achieved in the entire engine rotation range. It becomes possible to effectively adjust over the entire range, and it becomes possible to make each intake manifold 5 uniformly suck air.

Also in the case of this embodiment, the surge tank is not changed in the limited engine room without changing the intake pipe 2, the throttle body 4 and the intake manifold 5 mounted on the existing engine body. It is possible to substantially lengthen the air supply pipe 2 without changing the shape or size of the air supply pipe 1.

[0019]

As described above in detail, according to the present invention, since the collector having the predetermined length is provided in the surge tank so as to communicate with the air supply pipe, the length of the air supply pipe is increased in the limited engine room. Therefore, it is possible to prevent a local decrease in torque in the middle rotation range of the engine.

By providing a plurality of air holes of a predetermined size on the side surface of the collector, it is possible to pass through the air holes at a flow velocity according to the amount of air and supercharge due to the resonance effect. By using a branch pipe with a predetermined inner diameter instead of the air hole provided on the side surface of the collector provided inside, the air resistance can be reduced and the supercharging effect due to the inertial effect of air can be obtained. By providing each branch pipe provided with means for adjusting the air flow passage area of the branch pipe, the flow passage area can be adjusted according to the air flow rate, and supercharging by the inertia effect corresponding to the air flow rate can be performed. You can
It is possible to obtain high torque from a low rotation range to a high rotation range.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention partially in cross section.

FIG. 2 is a plan view showing another embodiment of the present invention partially in cross section.

FIG. 3 is a perspective view showing a part of the collector in FIG.

FIG. 4 is a perspective view showing a main part of another embodiment of the collector.

FIG. 5 is a diagram showing a relationship between torque and engine speed in the present invention.

FIG. 6 is a diagram showing a relationship between torque and engine speed in a conventional example.

FIG. 7 is a plan view of a conventional engine.

FIG. 8 is a diagram showing the relationship between torque and engine speed with respect to the length of the air supply pipe.

[Explanation of symbols] 1 Surge tank 2 Air supply pipe 5 Intake manifold 6 Collector 7 Air hole 9 Branch pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F02M 35/104 35/10 F02M 35/10 301 R

Claims (4)

[Claims] 1. A cylinder is provided with surge tanks provided on both sides of a V-type engine, an air supply pipe is connected to the surge tank, and an intake manifold connected from the air supply pipe to the surge tank via the surge tank. A V-type engine air supply device configured to supply combustion air to a V-type engine, characterized in that a collector having a predetermined length is provided in the surge tank in communication with the air supply pipe. . 2. The air supply device for a V-type engine according to claim 1, wherein a plurality of air holes having a predetermined size are provided on the side surface of the collector. 3. The air supply device for a V-type engine according to claim 2, wherein a branch pipe having a predetermined inner diameter is used instead of the air hole provided on the side surface of the collector provided in the surge tank. 4. The air supply device for a V-type engine according to claim 3, wherein each branch pipe provided in the collector is provided with means for adjusting an air flow passage area of the branch pipe.