JPH1144264A - Intake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent intrusion of mud and dust from connected parts in a device where an intake outlet projection protruding from an air flow meter is connected to an intake inlet recess opened in an air cleaner by attaching a seal member with an insertion length restriction means to the projection of the air flow meter. SOLUTION: Air taken in from an outside air intake port is measured in its amount of flow after dust or foreign matter is removed by an air element in an air cleaner 2 and the air is supplied into an internal combustion engine. Connected parts of the air cleaner 2 and the air flow meter 4 comprises a recess 2a formed in an air cleaner 2, a projection 4a protruding from the air flow meter 4, and a flanged seal member 3. The seal member 3 has several grooves on the outer periphery of a short cylindrical part which is a lip. With this constitution, it is possible to prevent generation of abnormal sound or wear at the time when connected parts 2a, 4a are brought into slidable contact with each other by vibration generating during operation of an internal combusition engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an intake device for an internal combustion engine.

[0002]

2. Description of the Related Art A conventional intake device for an internal combustion engine E is generally as shown in FIG. 3, and includes an air cleaner suction As disposed near the internal combustion engine E and the air cleaner. An air cleaner 2 for removing dust, dirt and the like contained in the air sucked from the suction As, and an air flow meter 4 joined to the air cleaner 2 for measuring an intake flow rate
A throttle body Tb for adjusting an amount of air sent from the air flow meter 4 in conjunction with an accelerator, and an internal combustion engine E joined to the throttle body Tb via an air intake pipe 6 and the like. Service to prevent intake pulsation
It is roughly constituted by the tank S.

The flow of air to be taken in will be described in order. Air introduced from the outside air intake port Ai of the air cleaner suction As arranged at the uppermost stream is joined to the air cleaner suction As. Inlet pipe 1a
And dust and dirt are removed by the air cleaner 2. After that, the air passes through the air cleaner 2 and the air flow
The flow rate is measured by the heater 4, passes through the outlet hose 5, further passes through the air intake pipe 6 joined to the outlet hose 5, and passes through the throttle body Tb.
To adjust the inhalation volume. Thereafter, the internal combustion engine E
The surge tank S joined to the manifold In is reached.

Further, in the intake device disclosed in Japanese Utility Model Registration No. 2509918, the internal combustion engine E
In order to increase the torque in the low speed range, the torque is increased by extending the length of the intake passage upstream of the intake passage, that is, between the throttle body-Tb and the air cleaner 2. At this time, the air cleaner 2
However, since the position of the air cleaner 2 and the like cannot be changed due to restrictions on the layout of the internal combustion engine room, a convex portion 4a having a predetermined length is protruded from the air flow meter 4, By forming a recess 2a in the air cleaner 2 for regulating the insertion length of the projection 4a, the projection 4a and the recess 2a are joined, and the intake passage is substantially extended by the overlap. Is done.

[0005]

However, as shown in FIGS. 3 and 4, the start-up of the internal combustion engine E can be achieved only by joining the convex portion 4a of the air flow meter 4 to the concave portion 2a of the air cleaner 2. When the concave portion 2a and the convex portion 4a come into contact with each other due to vibrations generated during operation or during operation, it causes abnormal noise and wear. Further, the internal combustion engine room is constantly exposed to mud and dust during traveling, and if these enter, the function of the air cleaner 2 cannot be sufficiently exhibited. Although the flange 2a for regulating the insertion length of the projection 4a is provided on the air cleaner 2, the insertion length of the projection 4a cannot be clearly confirmed.
Depending on the operator, there is a possibility that the screw will be screwed into force.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an air cleaner having a concave portion and an air flow due to vibration generated at the time of starting or operating an internal combustion engine. Eliminates the generation of abnormal noise and abrasion caused by the protrusions of the meter coming into contact with each other, and also prevents the intrusion of dust and dust from the joint between the recess of the air cleaner and the protrusion of the airflow meter. Another object of the present invention is to provide an air intake device that allows the abutting portion to be visually confirmed when a convex portion is inserted into the concave portion.

[0007]

According to the first aspect of the present invention,
An air intake device comprising an air cleaner having an intake inlet concave portion and an air flow meter having an intake outlet convex portion of a predetermined length joined to the concave portion, wherein the air flow meter is provided.
A seal member provided with an insertion length regulating means is attached to the convex portion of the air cleaner, and is joined to the concave portion of the air cleaner.

[0008]

[Action] As shown in FIGS. 1 and 2, the air flow - main - the convex portion 4a of the motor 4, is provided an insertion length control means 3 _a - the seal member 3 is attached, air chestnut - recesses of Na 2 The joint 2a prevents the recess 2a of the air cleaner 2 from coming into contact with the projection 4a of the air flow meter 4 due to vibration generated when the internal combustion engine E is started or operated. The concave portion 2a of the air cleaner 2 and the convex portion 4a of the air flow meter 4 are hermetically sealed via the seal member 3. further,
By providing the seal member 3 with the flange portion (insertion length regulating means) 3a, the abutting portion becomes visible when the convex portion 4a of the air flow meter 4 is inserted.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the same members as those of the conventional example are denoted by the same reference numerals. As shown in FIG. 1, an air intake device according to the present invention includes an air cleaner suction As disposed near an internal combustion engine, and dust and dirt contained in air sucked from the air cleaner suction As. An air cleaner 2 for removing air, an air flow meter 4 joined to the air cleaner 2 for measuring an intake air flow rate, and an amount of air sent from the air flow meter 4 linked to an accelerator. And a throttle body (not shown) for adjustment. Further, the throttle body is joined to a surge tank for preventing intake pulsation of an internal combustion engine (not shown).

Here, the flow of the air to be taken in is almost the same as that of the conventional example, but in the embodiment of the present invention, the outside air intake port Ai provided in the air cleaner suction As arranged at the most upstream side. The air taken in from the first resonator R
After being silenced in ₁ , the air passes through the inlet pipe 1a joined to the air suction joint Asj, reaches the joined air cleaner 2 via the inlet hose 1b,
Air cleaner - dust and dirt in the air is removed by Na 2 air element 2 ₁ disposed therein.

Thereafter, the air from which dust and dirt in the air have been removed is supplied to an air flow meter 4 joined to the air cleaner 2.
The flow rate is measured at and while passing through the outlet hose 5,
The outlet E - second raisonné the branch passage in the scan 5 are joined by clamp ring C ₁ - After being further muted by the data R _2, outlet E - Eainte joined to scan 5 by the clamp ring C ₂ - Kupaipu 6 to reach the throttle body -Tb, where the intake amount to the internal combustion engine is adjusted. Finally, the air whose intake amount has been adjusted reaches a surge tank and is supplied to the internal combustion engine via an intake manifold.

Next, as shown in FIG. 2, a joint portion between the air cleaner 2 and the air flow meter 4 is formed with a concave portion 2a provided on one side inside the air cleaner 2 and a joint with the concave portion 2a. A convex portion 4a protruding from an airflow meter 4
a) and a seal member 3 provided with a flange portion (insertion length regulating means) 3a attached to the seal member 3a.

Here, the seal member 3 is made of synthetic resin.
The flange portion 3a has a substantially short cylindrical shape, and a flange portion 3a whose outer shape is slightly larger than the short cylindrical portion is formed on one side. In addition, several grooves are provided on the outer periphery of the short cylindrical portion, and the outer periphery of the short cylindrical portion has a lip shape. The air cleaner 2 and the air flow meter 4 are joined by inserting the convex portion 4a of the air flow meter 4 from the flange portion 3a side of the seal member 3,
This is performed by inserting the convex portion 4a on which the seal member 3 is mounted into the concave portion 2a provided on one side inside the air cleaner 2. Also, at the time of joining, the flange portion 3a comes into contact with the cylindrical end of the intake port of the air cleaner, so that the amount of insertion of the air flow meter 4 into the air cleaner 2 is restricted, which is more than necessary. It is not inserted and its state is visible. Further, the fold shape of the outer periphery of the short cylindrical portion is inclined in the direction of the flange portion 3a, so that it can be inserted relatively easily at the time of joining, but has a shape that is difficult to be pulled out in the opposite direction, so that the air cleaner 2 and the air flow -Can be securely joined to the heater 4.

[0014]

According to the present invention, the convex portion of the air flow meter is provided with:
Since the seal member provided with the insertion length regulating means is mounted and joined to the concave portion of the air cleaner, the air cleaner and the air flow meter slide due to vibration generated at the time of starting or operating the internal combustion engine. The generation of abnormal noise and abrasion due to the fitting are eliminated, and the joint between the concave portion of the air cleaner and the convex portion of the air flow meter is sealed, thereby preventing intrusion of dust and dust. Further, by providing the insertion length regulating means on the seal member, the abutting portion becomes visible when the convex portion of the air flow meter is inserted, so that the worker can easily confirm the abutting. Further, since the flange portion is provided, it is possible to prevent the seal member from coming into the air cleaner and falling off due to the negative pressure of the intake air from the air cleaner side.

[Brief description of the drawings]

FIG. 1 is an exploded view of an intake device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a seal member at a joint between an air cleaner and an air flow meter according to the embodiment of the present invention.

FIG. 3 shows a top view of a conventional intake device.

FIG. 4 shows an air cleaner of an intake device according to a conventional example.

[Explanation of symbols]

 2 Air Cleaner 2a Concave Section 3 Seal Member 3a Flange 4 Air Flow Meter 4a Convex Section E Internal Combustion Engine In Intake Manifold

Claims (1)

[Claims] 1. An air intake system comprising: an air cleaner having an intake inlet concave portion; and an air flow meter having an intake outlet convex portion having a predetermined length joined to the concave portion. A suction member provided with an insertion length regulating means at a projection of the air cleaner, and joined to a recess of the air cleaner.