KR20170058172A - Air cleaner for work vehicle - Google Patents

Abstract

Disclosed is an air cleaner for a work vehicle. The air cleaner for a work vehicle according to the present invention includes a casing composed of a front body and a rear cap joined detachably to the front body. An intake is formed in a radial direction of the casing in one side of a circumferential unit of the front body of the casing. An outlet is formed on a longitudinal central part of a front end. A discharge pipe with a straight pipe forming a linear passage throughout inner and outer parts of the casing is installed in the outlet to be concentric to the casing. A cylindrical main filter arranged to partially cover the discharge pipe positioned inside the casing is contained inside the casing. A sensor mounting hole is formed in the straight pipe of the discharge pipe in an outer side of the casing adjoining the outlet. A mass air flow sensor is mounted in the sensor mounting hole. The purpose of the present invention is to provide the air cleaner for a work vehicle, which does not require readjustments of a control value of an ECU and calibration of an MAF sensor even when a layout of an air intake line is changed according to engine specifications.

Description

Air cleaner for work vehicle

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner for a work vehicle, and more particularly to an air cleaner for a work vehicle equipped with an air flow sensor that measures an intake air flow rate and transmits it to the ECU so as to be used as information for engine control.

In the conventional working vehicle, an air cleaner is generally installed to remove impurities from the air sucked for engine combustion. In addition, a mass air flow sensor (hereinafter, referred to as 'MAF sensor') which measures the flow rate of intake air (hereinafter referred to as 'intake air') is utilized as useful information for reducing NOx in engine control, Quot;).

When the MAF sensor measures the intake flow rate used for engine control and transmits it to the ECU, the ECU calculates the mixture ratio of air and fuel from the intake information received. The exhaust gas recirculation rate (exhaust gas recirculation flow rate) and the intake air amount are fed back and controlled to achieve optimum NOx reduction according to various engine operating environments.

Since the intake air amount is used as a basic factor in the engine control for achieving the optimum NOx reduction, the intake air amount must be measured stably and accurately so that the optimum engine control can be performed in accordance with the driving situation.

However, in a system in which the MAF sensor is disposed separately from the air cleaner, when the shape or arrangement of the intake line changes depending on the position of the air cleaner, there is a problem that the calibration value and the control value of the ECU must be set differently each time according to the intake line type.

Also, it is troublesome to adjust the position of the MAF sensor by selecting an appropriate position in accordance with the layout of the intake line, which varies according to the position of the air cleaner. Even if the MAF sensor is arranged at an appropriate position, A measurement error may occur depending on the structure, and it is difficult to perform accurate engine control to satisfy the exhaust gas regulation.

Japanese Unexamined Patent Publication No. 2006-027519 (published February 2, 2006) Japanese Patent Laid-Open No. 2009-012609 (published on January 22, 2009)

An object of the present invention is to provide an air cleaner for a work vehicle that does not need to calibrate the MAF sensor and readjust the control value of the ECU even if the layout of the intake line changes according to engine specifications.

Another object of the present invention is to provide an air cleaner for a work vehicle capable of increasing the degree of freedom of layout of an intake line without the hassle of repositioning the MAF sensor according to the position of the air cleaner with the MAF sensor integrated type .

According to an embodiment of the present invention as a solution to the problem,

An air cleaner applied to a working vehicle for removing impurities in air sucked for engine combustion,

A casing including a front body and a rear cap detachably coupled to the front body;

A suction port is formed at one side of the front body of the casing at a radial direction of the casing and a discharge port is formed at the center of the front end in the longitudinal direction;

 Wherein the discharge port is provided with a discharge pipe having a straight pipe portion for forming a linear flow path through the outside of the casing so as to be concentrically arranged at the same center as the casing;

A cylindrical main filter arranged to surround a part of the discharge pipe located inside the casing is housed in the casing;

A sensor mounting hole is formed in the straight pipe portion of the discharge pipe outside the casing adjacent to the discharge port, and a mass air flow sensor is mounted in the sensor mounting hole.

Preferably, the discharge tube is rotatable about 360 degrees with respect to the discharge port of the casing, so that even if the connection route to the intake manifold side is somewhat different according to the engine specifications, it can be easily coped with.

In addition, the length of the straight pipe of the discharge pipe located inside the casing is shorter than or equal to the length of the front body of the casing, so that the air resistance can be minimized.

In addition, by providing a grill net or a honeycomb grill net in which a plurality of vent holes are formed at the inlet end of the straight pipe section of the discharge pipe located inside the casing, the flow rate distribution of the air flowing into the straight pipe section is made uniform It is possible to achieve uniform distribution of air without being concentrated in a specific area.

Preferably, the sub-filter may further include a cylindrical sub-filter coaxially coupled to a discharge tube end inside the casing.

At this time, the sub-filter may have a configuration in which a filtering region is formed across the entire longitudinal direction.

Alternatively, the subfilter may be formed of a filtering region in a part of the longitudinal direction and a straight pipe region in the remaining part of the longitudinal direction.

According to the air cleaner for a working vehicle according to the embodiment of the present invention, the MAF sensor is integrally disposed on the discharge side. Even if the layout of the intake line changes according to the engine specifications, the calibration of the MAF sensor and the control value of the ECU It is possible to eliminate the necessity of re-adjustment and accordingly, it is possible to alleviate the burden on the worker accompanying the change of the intake line.

In addition, even if the intake line is changed in accordance with the engine specification or the vehicle exterior shape, the MAF sensor always measures the intake amount at the same position, thereby minimizing the measurement error that varies according to the position of the MAF sensor. And it can be used for different engine specifications in general.

In addition, since the MAF sensor integrated type eliminates the positioning and positioning operation of the MAF sensor according to the position of the air cleaner, it can be applied without any restriction on the structure of the intake line, thereby greatly improving the design freedom of the intake line And it is also advantageous in mounting and maintenance of the MAF sensor.

1 is a sectional view showing a preferred embodiment of an air cleaner for a working vehicle according to the present invention.
2 is a cross-sectional view of the air cleaner shown in Fig.
Fig. 3 is a front view of a grill net installed at the front end of the straight pipe section of Fig. 1; Fig.
4 is a sectional view showing another preferred embodiment of an air cleaner for a working vehicle according to the present invention.
5 is a sectional view showing still another preferred embodiment of an air cleaner for a working vehicle according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

It is to be understood that the terms "comprises", "having", and the like in the specification are intended to specify the presence of stated features, integers, steps, operations, elements, parts or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Also, the terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software .

In the following description with reference to the accompanying drawings, the same reference numerals are given to the same constituent elements, and a duplicate description thereof will be omitted. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 is a cross-sectional view showing a preferred embodiment of an air cleaner for a working vehicle according to the present invention, and FIG. 2 is a cross-sectional view taken along line A-A of the air cleaner shown in FIG. And Fig. 3 is a front view of the grill net installed at the front end of the straight pipe section of Fig.

1 to 3, an air cleaner according to an embodiment of the present invention is for removing impurities in air sucked for engine combustion. The air cleaner includes an air cleaner . The air cleaner 1 includes a casing 10 constituted by an outer body 12 and a rear cap 14 detachably coupled to the front body 12.

A suction port 120 is formed in a radial direction of the casing 10 at one side of the periphery of the front body 12 of the casing 10 and a discharge port 122 is formed at the center in the longitudinal direction of the front end.

A discharge tube 30 having a straight pipe portion 32 for forming a linear flow passage in the casing 10 is provided in the discharge port 122 so as to be concentrically arranged at the center of the casing 10. And the casing (10) accommodates a main filter (20) for removing impurities.

The main filter 20 is disposed so as to surround a part of the discharge tube 30 located inside the casing 10, and the main filter 20 may be formed in a cylindrical shape. The sensor mounting hole 45 is formed with a predetermined size in the straight pipe section 32 of the discharge pipe 30 outside the casing 10 adjacent to the discharge port 122. The sensor mounting hole 45 is provided with an air flow sensor A mass air flow sensor (hereinafter referred to as MAF sensor) is mounted.

The MAF sensor 40 measures the intake flow rate, which is used as information useful for engine control for reducing NOx, and transmits it to the ECU. The ECU calculates the mixture ratio of air and fuel, the EGR rate (exhaust gas recirculation rate), and the intake air amount from the received intake information, and performs engine control so that optimum NOx reduction can be realized according to various engine driving environments do.

The discharge tube 30 installed in the discharge port 122 of the casing 10 may be rotatably provided with respect to the casing 10. [ That is, by configuring the discharge pipe 30 to be rotatable as desired with respect to the casing 10, even if there is a slight change in the connection path (intake line) with the intake manifold (not shown) according to the engine specifications, It can be smoothly performed.

The straight pipe portion 32 located inside the casing 10 of the straight pipe portion 32 constituting the discharge pipe 30 is longer than the length L2 of the front main body 12 of the casing 10 May be formed to be short or the same length. It is preferable that the straight pipe portion 32 located inside the casing 10 is formed to be at least shorter than or equal to the length of the front body 12 so that the rear cap 14 and the straight pipe portion It is possible to avoid interfering with the antenna 32.

A grill net 35 having a plurality of vent holes may be provided at the front end of the straight pipe portion 32 of the discharge pipe 30 located inside the casing 10. [ 3, the air drawn into the straight pipe section 32 passes through the grill net 35 and flows through the grill net 35 at a uniform flow rate Can be uniformly distributed without being concentrated in a specific region while having a distribution.

Even air inflow without uniformity in a specific region with a uniform flow velocity distribution can ensure high measurement accuracy in measuring the air flow flowing through the straight pipe portion 32 by the MAF sensor 40 and extracting the numerical data have. Further, the engine control for realizing the optimal NOx reduction can be performed, thereby satisfying the exhaust gas regulation which is being further strengthened.

Other preferred embodiments of the air cleaner for a working vehicle according to the present invention will now be described.

FIG. 4 is a cross-sectional view showing another preferred embodiment of the air cleaner for a working vehicle according to the present invention, and FIG. 5 is a sectional view showing another preferred embodiment of the air cleaner for a working vehicle according to the present invention.

4 and 5 is different from the above-described embodiment in that it further includes a cylindrical sub-filter 50 (coarse-coupled to the tip of the discharge tube 30 inside the casing 10). There is no difference from the first embodiment except that a sub-filter 50 is further provided at the tip of the discharge pipe 30 in the casing 10, so that redundant description of the same components will be omitted, Only briefly.

The sub filter 50 may have a configuration in which the filtering region A1 is formed between the entire longitudinal direction (direction coinciding with the central axis of the discharge pipe 30) as in the example of Fig. The sub filter 50 may have a cylindrical shape with a diameter equal to the diameter of the straight pipe portion 32 of the discharge pipe 30 and a side opposite to the straight pipe portion 32. The filter material may be antibacterial and electrostatic Woven fabric.

The subfilter 50 may be detachably attached to the tip of the discharge pipe 30 inside the casing 10 through a spiral connection or a separate clamp so that the subfilter 50 can be freely replaced according to the state, (For example, a nonwoven fabric) so that secondary filtration of the impurities can be performed through the part.

5 showing another preferred embodiment of the sub-filter 50 includes a sub-filter 50 having a part of the sub-filter 50 formed in the filtering area A1 and a remaining part of the sub- A2 so as to make the length of the discharge pipe 30 in the casing 10 as short as possible. That is, it is intended to secure the linear flow path required for accurate measurement of the intake air quantity through the MAF sensor 40 from the sub-filter 50.

Of course, the subfilter 50 according to the present embodiment may be detachably attached to the tip of the discharge pipe 30 in the casing 10 through a spiral connection or a separate clamp so that the subfilter 50 can be freely replaced according to the state, (For example, a non-woven fabric) similar to that of the body so that the impurity secondary filtration can be performed through the portion.

The operation and effect of the air cleaner for a work vehicle according to the embodiment of the present invention having the above-described structure will be described in connection with the operation of the work vehicle driving unit to which the air cleaner is applied. An air cleaner according to another preferred embodiment of Fig. 5 will be described by way of example.

When the engine is driven, a suction force acts on the intake port of the air cleaner, and air is sucked in. The sucked air passes through the main filter 20 in the air cleaner. In this process, the impurities contained in the sucked air are primarily filtered and passed through the sub filter 50 disposed inside the main filter 20 The filtration process for the impurities is additionally performed.

The end portion of the discharge pipe 30 outside the casing 10 is connected to the intake manifold of the engine so as to be air-flowable through the intake line so that the intake air exiting the air cleaner flows to the intake manifold side through the intake line. And is uniformly supplied to each cylinder side of the engine. Of course, if the turbocharger is disposed in the middle of the intake line, the turbocharger compresses the intake air to a predetermined pressure.

The MAF sensor 40 detects the mass flow rate of the intake air flowing through the straight pipe section 32 of the discharge pipe 30 in the middle of the intake air flowing into the engine via the discharge pipe 30, And the ECU feedback-controls the engine so as to realize an engine drive capable of minimizing the harmful substances in the exhaust gas, based on the detection value sent by the MAF sensor 40, in an optimum output according to the load conditions.

According to the air cleaner for a working vehicle according to the embodiment of the present invention, the MAF sensor is integrally disposed on the discharge side. Even if the layout of the intake line is changed according to the engine specifications, the calibration of the MAF sensor and the control value It is possible to eliminate the burden of recalibrating the intake line, thereby reducing the load on the worker accompanying the change in the intake line.

In addition, even if the intake line is changed in accordance with the engine specification or the vehicle exterior shape, the MAF sensor always measures the intake amount at the same position, thereby minimizing the measurement error that varies according to the position of the MAF sensor. And it can be used for different engine specifications in general.

In addition, since the MAF sensor integrated type eliminates the positioning and positioning operation of the MAF sensor according to the position of the air cleaner, it can be applied without any restriction on the structure of the intake line, thereby greatly improving the design freedom of the intake line And it is also advantageous in mounting and maintenance of the MAF sensor.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

1: Air cleaner
10: Casing
12: front body
14: rear cap
20: Main filter
30: Discharge tube
32: straight pipe
35: Grill net
40: Air flow sensor (MAF sensor)
50: Sub-filter
120: inlet
122:
A1: Filtered area
A2: Intuition area

Claims (7)

An air cleaner applied to a working vehicle for removing impurities in air sucked for engine combustion,
And a rear cap (14) detachably coupled to the front body (12) and the front body (12);
A suction port 120 is formed in a radial direction of the casing 10 at one side of the periphery of the front body 12 of the casing 10 and a discharge port 122 is formed at the center in the longitudinal direction of the front end;
A discharge pipe 30 having a straight pipe portion 32 for forming a linear flow path in the casing 10 is provided in the discharge port 122 so as to be concentrically arranged at the center of the casing 10;
Inside the casing (10), a cylindrical main filter (20) is arranged to surround a part of the discharge pipe (30) located inside the casing (10);
A sensor mounting hole 45 is formed in the straight pipe portion 32 of the discharge pipe 30 outside the casing 10 adjacent to the discharge port 122 and an air flow sensor Flow sensor, 40).
The method according to claim 1,
Wherein the discharge tube (30) is rotated 360 degrees with respect to the discharge port (122) of the casing (10).
The method according to claim 1,
Wherein the length L1 of the straight pipe portion 32 of the discharge pipe 30 located inside the casing 10 is shorter than or equal to the length L2 of the front body 12 of the casing 10. [ Air cleaner.
4. The method according to any one of claims 1 to 3,
Characterized in that a lattice type or honeycomb type grill net (35) is provided in which a plurality of ventilation holes are formed at the front end entrance of the straight pipe section (32) of the discharge pipe (30) located in the casing (10) Car air cleaner.
The method according to claim 1 or 3,
And a cylindrical sub-filter (50) coaxially coupled to the tip of the discharge pipe (30) inside the casing (10).
6. The method of claim 5,
Wherein the sub-filter (50) has a configuration in which a filtering region (A1) is formed over the entire length of the sub-filter (50).
6. The method of claim 5,
Wherein the subfilter (50) comprises a straight pipe region (A2) in which a part of a longitudinal direction of the subfilter (50) is formed as a filtering region (A1) and a remaining portion of the subfilter (50) is closed.

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