JPS5933891Y2 - Engine intake and exhaust resistance reduction structure - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an engine intake/exhaust resistance reduction structure suitable for reducing ventilation resistance in a component of an engine intake/exhaust system path such as an air cleaner.

BACKGROUND ART Conventionally, some parts of an engine's intake and exhaust system, such as air cleaners, which are molded from synthetic resin, inevitably have sharp corners due to the structure of the mold.

When such an acute angle portion exists in the intake/exhaust system path, the performance of the engine decreases due to increased ventilation resistance.

In addition, when attaching a curved resin molded product to an acute corner using heat caulking to prevent deterioration of engine performance, this molded product is likely to come off due to vibration, etc., and long-term reliability is not guaranteed. The problem is that it cannot be done.

This idea was developed in view of the above-mentioned conventional problems, and has a simple and highly reliable structure, reduces intake and exhaust system configuration path Q, and improves engine performance. The purpose is to provide a structure that reduces intake and exhaust resistance.

In order to achieve the above object, the engine intake/exhaust resistance reduction structure according to this invention includes a curved crowning member that covers the acute corner formed in the intake/exhaust passage of the engine. This crowned member has a pair of clamping parts that clamp the partition wall part formed with the acute angle part from both sides, and a pair of clamping parts that protrude inward from one of the clamping parts and engage with a groove provided in the partition wall part. The engaging claw contacts an end surface that protrudes inwardly from the clamping part and forms an acute angle part, and together with the engaging claw, clamps the partition wall in a longitudinal direction of the partition wall that is perpendicular to the direction in which the partition wall part is held by the pair of clamping parts. The stopper part is formed integrally with the crowned member, and the crowned state is maintained by the spring force of the crowned member itself.

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

FIG. 1 is an explanatory diagram showing an air cleaner 10 to which an embodiment of the engine intake/exhaust resistance reduction structure according to the present invention is applied. is tightened to form an air cleaner case.

Air flowing in from the inlet 14 of the case 11 passes through the element 13 once, then flows out from the outlet 15 on the cap 12 side and is supplied to the engine side.

Here, the inner end of the partition wall 16 forming a part of the outlet 15 of the cap 12 is formed with an acute angle part 1T based on the structure of the mold, as shown in FIG.
・Ru.

In addition, in FIG. 2, 18 indicates a locking groove.

The acute angle portion 1T of the partition wall portion 16 is covered with a covering member 20 as shown in FIG.

The crowned member 20 is made of spring steel or the like, and has a curved surface 21.
a fourth outer surface extending from both sides of the curved surface 210;
As shown in the figure, a clamping part 22 elastically clamps the partition part 16 from above and below, and a locking groove part 1 of the partition part 16 that is cut out from the clamping part 22 on the lower surface side and bent inward.
8, and a stopper that projects upward from the lower surface of the curved surface 21 and abuts the end surface of the partition wall 16 to sandwich the partition wall 16 in the longitudinal direction together with the stop claw 23. 24.

Next, the operation of the above embodiment will be explained.

The acute angle part 1T of the partition wall part 16 is caused by the spring action of the clamping part 22,
Because the locking action of the locking claw portion 23 and the stopper portion 24 causes the air to be covered by the curved surface 21 of the crowned member 20 mounted, the air flowing into the inlet 14 and flowing out from the outlet 15 is vented to a large extent in the air cleaner 10. It is distributed in a smooth flowing state without encountering resistance.

That is, according to the above embodiment, the acute angle portion 1 of the partition wall portion 16
Due to the presence of the curved surface 21 of the crowned member 20 that is crowned by γ, an increase in ventilation resistance in the intake system of the engine is reduced, and engine performance can be improved.

Further, the crowned member 20 elastically moves the partition wall portion 1 through its own clamping portion 22, locking claw portion 23, and stopper portion 24.
6, the installation is easy,
It can be installed without any play and will not come off for a long time even in environments where external vibrations are applied.

FIG. 5 shows an air cleaner of the type A in which the outlet section is exposed with an acute angle part 17 as shown in FIG. 6A, and an acute corner part 17 is molded with resin as shown in FIG. A diagram showing the reduction in ventilation resistance in Type B, in which the parts 25 are joined by heat caulking, and Type C, in which the same crowning member 20 as in the above embodiment is attached to the acute corner as shown in FIG. 6C. It is.

According to this experimental result, the amount of air is 6.3rr? 7m
The ventilation resistance of type B is 42.5mmAq lower than that of type A when the airflow resistance is fixed at m, and the ventilation resistance is 22.
% improvement, C type has 31.5mmA compared to A type.
It is recognized that q decreases and improves by 17%.

Here, the ventilation resistance of the C type with the crowned member 20 attached is higher by IO++ mAq than the B type with the resin molded product 25 joined, but this difference is due to the effect of the crowned member 20 on the partition wall 16. This problem can be solved by making the shape of the fitting part smoother.

In the above embodiment, the engine intake/exhaust resistance reduction structure according to this invention is applied to the air cleaner of the intake system, but it is of course applicable to other components of the intake/exhaust system. It is.

As described above, the engine intake/exhaust resistance reduction structure according to this invention is formed by capping the acute angle portion formed in the engine O and exhaust passage with a curved crown member. The member includes a pair of clamping parts that clamp the partition wall part having an acute angle from both sides, an engaging claw that projects inward from one of the clamping parts and engages with a groove provided in the partition wall part, and A stopper part that protrudes inward from the clamping part and comes into contact with an end surface forming an acute angle part, and clamps the partition part together with the engaging claw in the longitudinal direction of the partition wall perpendicular to the longitudinal direction of the partition wall by the pair of clamping parts; The crowned state is maintained by the spring force of the crowned member itself, making it easy to install, with a simple and highly reliable structure, reducing airflow resistance in the engine intake and exhaust system, and improving engine performance. This has the effect of improving performance.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an air cleaner to which the engine intake/exhaust resistance reduction structure according to this invention is applied, Fig. 2 is an enlarged sectional view of the acute angle portion, and Fig. 3 is a sectional view showing the crowned member. FIG. 4 is an enlarged perspective view, FIG. 4 is a sectional view showing a state in which a crown member is attached to the acute corner, FIG. 5 is a line diagram showing a state in which ventilation resistance is reduced, and FIGS. FIG. 6 is a sectional view showing the test structure from which FIG. 5 was obtained. 11... Acute angle part, 20... Crowned member,
21...Wave curved surface, 22...Holding part,
23...Latching claw part, 24...Stock collar part.

Claims (1)

[Scope of utility model registration request] An acute corner formed in the intake and exhaust passage of the engine is covered with a crowned member having a curved surface.
a pair of clamping parts that clamp the partition wall portion having an acute angle from both sides; an engaging claw that protrudes inward from one of the clamping parts and engages with a groove provided in the partition wall part; a stopper portion that comes into contact with an end surface that protrudes inward to form an acute angle portion and that, together with the engaging claw, clamps the partition wall in a longitudinal direction of the partition wall that is orthogonal to a direction in which the partition wall portion is held by the pair of clamping portions;
An intake/exhaust resistance reduction structure for an engine, characterized in that the crowned member is integrally formed and the crowned state is maintained by the spring force of the crowned member itself.