JP2005188363A - Air cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air cleaner equally distributing intake air to a filter element, reducing ventilation resistance, realizing the optimal ventilation resistance, and increasing an intake air amount at need. <P>SOLUTION: In this air cleaner comprising the filter element arranged on an air duct leading to an internal combustion engine and a case attachably/detachably storing the filter element, the case is formed into such a conical shape that a passage width is gradually reduced from the filter element toward an upstream side, and has an opening of a predetermined size at its end. A rod movably projected from the center of a filter toward the upstream side, a straightening block arranged at the end of the rod and whose upstream side end is formed into a streamline shape, and a spring retaining the straightening block to a position at a predetermined interval from the periphery of the opening, are provided to the inside of the opening. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air cleaner that filters air taken into an internal combustion engine of an automobile.

  The air cleaner disclosed in Patent Document 1 aims to reduce the air resistance of the air cleaner and increase the amount of dust retained. A rectifying plate is set up on the bottom surface of the case of the air cleaner, and a gap is formed between the rectifying plate and the filter element. And at least a part of the rectifying plate is bent in the plan view of the case. As a result, the current plate standing on the dust side guides the air flow on the dust side, so that the air resistance of the air cleaner can be lowered, and the dust is held over the entire surface of the filter element by the gap. It is what is done.

The air cleaner disclosed in Patent Document 2 is provided with a diffusion plate on the downstream side of the inlet pipe of the air cleaner for the purpose of extending the life of the cleaner element and reducing turbulence generated in the intake air flow. The intake air flow that flows in is divided and guided by the diffusion plate so as to uniformly strike the cleaner element.
JP 2003-227425 A JP 2000-346687 A

  As is clear from the above references, the air cleaner has been required to have low ventilation resistance and to have an intake air flow evenly on the cleaner (filter) element.

  However, when a guide or the like is provided in order to distribute the intake air flow evenly to the cleaner element, there is a problem that the ventilation resistance is improved and the noise is increased.

  For this reason, the present invention can distribute the intake air evenly to the filter elements, reduce the airflow resistance, achieve the optimum airflow resistance, and increase the air intake amount as necessary. It is to provide an air cleaner capable of performing the above.

  Therefore, the present invention provides an air cleaner including a filter element disposed on an air passage leading to an internal combustion engine and a case in which the filter element is detachably accommodated. The case is disposed upstream from the filter element. The rod is formed in a conical shape in which the passage width gradually decreases toward the end, and has an opening of a predetermined size at the tip thereof, and the rod protrudes movably from the filter center toward the upstream side in the opening And a rectifying block that is disposed at the tip of the rod and has an upstream tip formed in a streamline shape, and a spring that holds the rectifying block at a predetermined distance from the periphery of the opening. It is characterized by.

  As a result, since the opening is restricted by the opening and the rectifying block, a predetermined ventilation resistance can be obtained, and when the output of the internal combustion engine increases and the intake air amount increases, the rectifying block is In order to move to the downstream side against the urging force, the gap between the opening and the rectifying block is increased, and the airflow resistance is reduced, and at the same time, the intake amount can be reliably increased.

  Furthermore, since the rectifying block is formed in a streamlined shape, the air sucked from between the opening and the rectifying block flows and diffuses along the shape of the rectifying block, and thus is provided on the downstream side of the rectifying block. It is equally distributed to the filter elements.

  The downstream end of the rectifying block is preferably formed in a streamline shape. As a result, the downstream flow of the rectifying block can be further suppressed, so that the air flow to the filter element can be made more uniform.

  Further, the rectifying block is preferably moved to a position where the intake air pressure and the restoring force of the spring are balanced. For this reason, a desired change in ventilation resistance can be obtained by changing the strength of the spring.

  According to this invention, a predetermined interval is formed between the rectifying block and the opening formed at the tip of the case formed in the conical shape, and the rectifying block moves with respect to the opening. Therefore, it is possible to obtain an intake air amount corresponding to the output of the internal combustion engine with a simple structure. Further, since the flow straightening block is formed in a streamline shape, the air flow to the filter element can be made uniform, so that the life of the filter element can be improved.

  Furthermore, since the rectifying block is streamlined, generation of unpleasant noise can be suppressed even if the amount of ventilation is limited.

  Embodiments of the present invention will be described below with reference to the drawings.

  An air cleaner 1 according to an embodiment of the present invention is arranged on the upstream side of a ventilation pipe 3 connected to an internal combustion engine (not shown), and includes a filter element 4 and a case 2 for housing the filter element 4. .

  The filter element 4 includes a filter portion 15 that is arranged so that crest portions and trough portions that are formed in an annular shape are alternately positioned in the radial direction, and a flange portion 17 that holds the periphery of the filter portion 15. The packing 18 disposed around the flange portion 17 is sandwiched and fixed between the upstream end portion of the ventilation pipe 3 and the downstream end portion of the case 2.

  The case 2 is provided with a filter mounting portion 12 having a filter holding portion 12a for holding and fixing the filter element 4, and a boss portion 12b formed at the center of the filter mounting portion 12 includes a rectifying mechanism 5. Is provided. Further, the case 2 is formed in a conical shape, particularly a conical shape in which the passage width gradually decreases from the portion where the filter is mounted toward the upstream side, and an opening 6 is formed at the tip portion thereof, On the opposite side, an enlarged portion 7 is formed in which the passage width gradually increases. The case 2 is preferably formed of aluminum, stainless steel, or resin.

  The rectifying mechanism 5 includes a rectifying block 8 disposed in the vicinity of the opening 6, the rectifying block 8 fixed to one end, and the other end penetrating the boss portion 12 b and being removed by a fixing nut 11. The rod 9 is prevented and the spring 10 has one end abutting on the periphery of the boss portion 12 b and the other end abutting a spring receiving recess 8 c formed on the downstream side of the rectifying block 8. Further, a streamlined shape is formed from the upstream side 8a to the downstream side 8b of the rectifying block 8.

  In the rectifying block 8, the length of the rod 9 is adjusted by rotating the fixing nut 11, and the position relative to the opening 6 is varied. And the width | variety of the clearance gap 13 between the rectification | straightening block 8 and the said opening part 6 is adjusted, and predetermined | prescribed ventilation resistance can be obtained.

  Therefore, since the intake air sucked from the gap 13 spreads with respect to the filter element 4 in the downstream space 14 of the rectifying block 8, the intake air flows evenly through the filter portion 15 of the filter element 4 and reaches the downstream side passage 16. It is.

  Further, when the output of the internal combustion engine increases, the pressure on the passage 16 side rapidly decreases compared to the outside air, so that the rectifying block 8 moves downstream against the urging force of the spring 10, and the opening portion 6, the gap 13 formed between the two is enlarged, and the amount of intake air is secured.

It is sectional drawing which showed the structure of the air cleaner which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air cleaner 2 Case 3 Ventilation pipe 4 Filter element 5 Rectification mechanism 6 Opening part 7 Expansion part 8 Rectification block 9 Rod 10 Spring 11 Fixing nut 12 Filter mounting part 13 Crevice

Claims (3)

In an air cleaner constituted by a filter element disposed on an air passage leading to an internal combustion engine, and a case in which the filter element is detachably accommodated,
The case is formed in a conical shape in which the passage width gradually decreases from the filter element toward the upstream side, and has an opening of a predetermined size at the tip thereof.
In the opening, a rod protruding movably from the filter center toward the upstream side; and
A rectifying block that is disposed at the tip of the rod and has an upstream tip formed in a streamlined shape;
An air cleaner comprising: a spring that holds the rectifying block at a position spaced apart from a peripheral edge of the opening.   The air cleaner according to claim 1, wherein a downstream end portion of the rectifying block is also formed in a streamline shape.   The air cleaner according to claim 1, wherein the rectifying block moves to a position where the intake air pressure and the restoring force of the spring are balanced.

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