JP2018091313A - Air cleaner of internal combustion engine and intake system of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically clean a filter element with a simple constitution.SOLUTION: An air cleaner 10 is applied to an internal combustion engine including an intake passage 60 in which a compressor 62 and a throttle valve 63 are successively disposed from an upstream side, and an air bypass passage 70 connecting a region between the compressor 62 and the throttle valve 63 in the intake passage 60 and an upstream side of the compressor 62, and provided with an air bypass valve 71. The air cleaner 10 includes a case 20 having an inlet 25, a cap 30 having an outlet 35, and a filter element 50 having a filtering portion 51 disposed between an opening 21 of the case 20 and an opening 31 of the cap 30. The cap 30 has a connection port 42 to which the air bypass passage 70 is connected, and a blower mechanism 40 driven by a pressure of the air returned through the connection port 42 and shaking off dust accumulated on the filtering portion 51.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an air cleaner for an internal combustion engine and an intake system for the internal combustion engine.

  An air cleaner for an internal combustion engine includes a case having an inlet, a cap having an outlet, and a filter element having a filtering portion provided between the opening of the case and the opening of the cap. The filter element has a filtration part formed by folding a filter material sheet, and a seal part provided at the periphery of the filtration part. When the air taken in with the operation of the internal combustion engine passes through the filter part of the filter element, the air is filtered by capturing the dust contained in the air.

Conventionally, in order to extend the life of the filter element, a technique for automatically cleaning the filtration unit has been proposed (see, for example, Patent Document 1).
The air cleaner described in Patent Document 1 is provided with a cleaning device that reciprocates a cleaning member provided inside the case using intake pipe negative pressure of the internal combustion engine.

  In other words, an air cylinder is provided outside the case of the air cleaner, and a piston connected to the cleaning member and a coil spring that urges the piston in one direction are provided inside the air cylinder. ing. A surge tank of an internal combustion engine communicates with the air cylinder through an air passage. The air passage is provided with a three-way valve that switches the inside of the air cylinder between an atmospheric pressure introduction state and a negative pressure introduction state.

  In such a cleaning device, when the inside of the air cylinder is brought into an atmospheric pressure introduction state by switching the three-way valve, the cleaning member is moved in the one direction by the biasing force of the coil spring. On the other hand, when the inside of the air cylinder is brought into a negative pressure introduction state by switching the three-way valve, the cleaning member is directed in a direction opposite to the one direction against the biasing force of the coil spring by the negative pressure of the intake pipe. Moved.

JP 2012-219703 A

  By the way, the technique described in Patent Document 1 uses the intake pipe negative pressure of the surge tank, and includes an air passage that communicates the surge tank and the air cylinder as an essential component. Therefore, there exists a problem that the structure for performing the automatic cleaning of a filter element becomes complicated.

  An object of the present invention is to provide an air cleaner for an internal combustion engine and an intake system for the internal combustion engine that can automatically clean a filter element with a simple configuration.

  An air cleaner for an internal combustion engine for achieving the above object includes an intake passage in which a compressor and a throttle valve constituting a supercharger are sequentially provided from the upstream side, and the compressor and the throttle valve in the intake passage. It is applied to an internal combustion engine having an air bypass passage provided with an air bypass valve while communicating with a portion in between and an upstream side of the compressor, and is provided on the upstream side of the compressor in the intake passage. A case having an inlet, a cap having an outlet, and a filter element having a filtration portion provided between the opening of the case and the opening of the cap, the air bypass passage being connected to the cap. Connected to the filter and a filter that is driven by the pressure of the air returned through the connection and accumulates in the filter. And a mechanism to shake off the door is provided.

  Further, an intake system for an internal combustion engine for achieving the above object includes an intake passage for introducing intake air into a combustion chamber of the internal combustion engine, and the intake passage includes the air cleaner and the supercharger in order from the upstream side. And a throttle valve is provided, and a portion of the intake passage between the compressor and the throttle valve and the connection port provided in the cap of the air cleaner are air bypass. An air bypass valve is provided in the air bypass passage.

  In an internal combustion engine with a supercharger, if the pressure between the compressor and the throttle valve in the intake passage suddenly increases as the throttle valve located on the downstream side of the compressor is closed, the compressor or the like becomes excessive. May cause excessive load. Therefore, in order to avoid such an increase in pressure, the air bypass valve is opened to release the pressure.

  According to the above configuration, for example, when the operation of the internal combustion engine is stopped, the throttle valve is closed and the air bypass valve is opened, so that the mechanism is driven by the air pressure returned through the air bypass passage and the connection port. . Thereby, the dust accumulated on the filter part of the filter element is shaken off.

  According to the present invention, the filter element can be automatically cleaned with a simple configuration.

Sectional drawing which shows the state under engine operation about one Embodiment of the intake system of an internal combustion engine. Sectional drawing which shows the state immediately after engine operation | movement is stopped about the intake system in the embodiment.

Hereinafter, an embodiment will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the in-vehicle internal combustion engine intake system includes an intake passage 60 for introducing intake air into the combustion chamber.

In the intake passage 60, an air cleaner 10, a compressor 62 constituting a supercharger 61, and a throttle valve 63 are provided in this order from the upstream side.
An air bypass passage 70 that communicates a portion of the intake passage 60 between the compressor 62 and the throttle valve 63 and the upstream side of the compressor 62 is provided. An air bypass valve 71 is provided in the air bypass passage 70.

  The throttle valve 63 and the air bypass valve 71 are driven to open and close by actuators (not shown). The opening control of the throttle valve 63 and the air bypass valve 71 is performed by an electronic control device (not shown).

Next, the air cleaner 10 will be described.
The air cleaner 10 includes a case 20 having an upper opening 21 and a cylindrical inlet 25, a cap 30 having a lower opening 31 and a cylindrical outlet 35, and between the opening 21 of the case 20 and the opening 31 of the cap 30. And a filter element 50 having a filtration part 51 provided in the filter.

<Case 20>
The case 20 has a peripheral wall 22 and a bottom wall 23 that surround the opening 21, and is formed of a hard resin material. The inlet 25 projects from the outer surface of the peripheral wall 22. A flange 24 is formed around the entire periphery of the opening 21.

  A plurality of discharge holes 26 are formed in the center of the bottom wall 23. A dust exhaust valve 27 that covers the plurality of discharge holes 26 from below and discharges dust to the outside is attached to the outer surface of the central portion of the bottom wall 23.

  The dust exhaust valve 27 is a well-known structure formed of a rubber material. When the inside of the case 20, that is, the interior of the dust exhaust valve 27 becomes negative pressure as the engine is operated, the opposing surfaces of the tip opening portion 28 come into close contact with each other. On the other hand, when vehicle vibrations are applied, the opposing surfaces of the tip opening 28 are temporarily opened to discharge dust to the outside.

<Cap 30>
The cap 30 has a peripheral wall 32 and a top wall 33 that surround the opening 31, and is made of a hard resin material. The outlet 35 protrudes from the outer surface of the peripheral wall 32. A flange 34 is formed around the periphery of the opening 31. Note that an air flow meter (not shown) that detects the intake air flow rate is attached to the outlet 35.

<Filter element 50>
The filter element 50 includes a filtration part 51 formed by folding a filter material sheet such as a nonwoven fabric or filter paper, and an annular seal part 52 formed of closed-cell foamed urethane and provided at the periphery of the filtration part 51. have.

The seal portion 52 is sandwiched between the flange 24 of the case 20 and the flange 34 of the cap 30, thereby sealing between the cap 30 and the seal portion 52.
<Blower mechanism 40>
The cap 30 of the air cleaner 10 blows air toward the filtration unit 51 by rotationally driving the blower fan 47 by the pressure of air returned through the air bypass passage 70, and dust accumulated in the filtration unit 51 by the wind pressure is blown. A blower mechanism 40 for shaking off is provided.

That is, an accommodation portion 41 having an opening 43 that protrudes upward and opens into the cap 30 is formed at the central portion of the top wall 33 of the cap 30.
A cylindrical connection port 42 projects from the outer surface of the accommodating portion 41. One end of the air bypass passage 70 is connected to the connection port 42.

  A partition wall 44 that partitions the internal space into an upper space that communicates with the connection port 42 and a lower space that communicates with the opening 43 is provided inside the accommodating portion 41. A bearing hole 45 is formed through the partition wall 44.

  A turbine wheel 46 and a blower fan 47 are accommodated in the upper space and the lower space, respectively. In the present embodiment, the entire blower fan 47 is accommodated in the lower space of the accommodating portion 41.

  The turbine wheel 46 is connected to the upper end of a connecting shaft 48 inserted through the bearing hole 45. The blower fan 47 is connected to the lower end of the connecting shaft 48. The connecting shaft 48 is rotatably supported by the bearing hole 45.

In the present embodiment, the blower fan 47 and the opening 43 are disposed so as to face the central portion of the filtration unit 51. A dust exhaust valve 27 is provided directly below the blower fan 47.
Next, the operation of this embodiment will be described.

  In an internal combustion engine with a supercharger 61, when the throttle valve 63 located on the downstream side of the compressor 62 is closed, the pressure between the compressor 62 and the throttle valve 63 in the intake passage 60 increases rapidly. In addition, an excessive load may be applied to the compressor 62 and the like. Therefore, in order to avoid such an increase in pressure, the air bypass valve 71 is opened to release the pressure.

  According to this embodiment, as shown in FIG. 2, when the operation of the internal combustion engine is stopped, the throttle valve 63 is closed and the air bypass valve 71 is opened, so that the air bypass passage 70 and the connection port 42 are opened. The turbine wheel 46 is rotationally driven and the blower fan 47 is rotationally driven by the pressure of the returned air.

  At this time, as shown by a two-dot chain line arrow in the drawing, the dust accumulated on the filter portion 51 of the filter element 50 is shaken off by the pressure of the blower fan 47. The dust that has been shaken off is collected inside the dust discharge valve 27 through the discharge hole 26 of the case 20, and is discharged to the outside when the dust discharge valve 27 is opened due to vehicle vibration or the like.

According to the air cleaner for an internal combustion engine and the intake system for the internal combustion engine according to the present embodiment described above, the following effects can be obtained.
(1) The cap 30 of the air cleaner 10 has a connection port 42 to which the air bypass passage 70 is connected, and a blower that is driven by the pressure of the air returned through the connection port 42 to shake off dust accumulated in the filtration unit 51. A mechanism 40 is provided.

According to such a structure, since the said effect | action is show | played, automatic cleaning of the filter element 50 can be performed by a simple structure.
(2) The blower mechanism 40 includes a blower fan 47 that is rotationally driven by the pressure of air returned through the connection port 42 and blows air toward the filtering unit 51.

  According to such a configuration, the dust accumulated in the filter part 51 of the filter element 50 is shaken off by the pressure generated by the blower fan 47. For this reason, automatic cleaning of the filter element 50 can be performed without damaging the filtration part 51.

  (3) The top wall 33 of the cap 30 is provided with a receiving portion 41 that protrudes outward. The entire blower fan 47 is housed inside the housing portion 41. For this reason, increase in ventilation resistance by the blower fan 47 can be appropriately avoided. In addition, since the air flow is appropriately prevented from being disturbed by the blower fan 47, it is possible to appropriately avoid adversely affecting the detection characteristics of the air flow meter.

(4) The blower fan 47 is disposed so as to face the central portion of the filtration unit 51.
According to such a configuration, the wind pressure generated by the blower fan 47 can be applied to the central portion of the filtering unit 51. For this reason, the dust accumulated in the filtration part 51 can be shaken off effectively.

(5) The case 20 is provided with a dust exhaust valve 27 for discharging dust to the outside.
The dust shaken off from the filtering part 51 of the filter element 50 accumulates on the inner surface of the bottom wall 23 of the case 20, but these dusts are scattered by the air introduced through the inlet 25 to the filtering part 51. There is a risk of deposition again.

  In this regard, according to the above configuration, the dust shaken off from the filtration unit 51 is discharged to the outside through the dust discharge valve 27, so that the dust accumulated on the bottom wall 23 is re-scattered and re-deposited on the filtration unit 51. Can be suppressed. Therefore, automatic cleaning of the filter element 50 can be performed effectively.

  (6) A dust exhaust valve 27 is provided at the center of the bottom wall 23. In other words, since the dust discharge valve 27 is provided directly below the blower fan 47, much of the dust shaken off from the filtration unit 51 is likely to collect in the dust discharge valve 27. Therefore, re-scattering of the dust accumulated on the bottom wall 23 and redeposition on the filtration part 51 can be effectively suppressed.

  (7) The intake system of the internal combustion engine includes an intake passage 60 for introducing intake air into the combustion chamber. In the intake passage 60, an air cleaner 10, a compressor 62 constituting a supercharger 61, and a throttle valve 63 are provided in this order from the upstream side. A portion of the intake passage 60 between the compressor 62 and the throttle valve 63 and a connection port 42 provided in the cap 30 of the air cleaner 10 are connected via an air bypass passage 70. The air bypass passage 70 is provided with an air bypass valve 71 for releasing the pressure between the compressor 62 and the throttle valve 63 in the intake passage 60.

According to such a configuration, the same effect as the effect (1) can be obtained.
<Modification>
In addition, the said embodiment can also be changed as follows, for example.

The position of the dust discharge valve 27 can be changed to other positions such as the corner of the bottom wall 23 of the case 20.
The dust valve 27 can be omitted.

The blower fan 47 can be disposed to face a portion other than the central portion such as the peripheral portion of the filtering portion 51.
For example, a part of the blower fan 47 may protrude below the opening 43. Further, the entire blower fan 47 may protrude below the opening 43.

  The mechanism that shakes off the dust accumulated on the filtration unit 51 is not limited to the blower mechanism 40 that rotationally drives the blower fan 47. The filter member 51 of the filter element 50 may be directly vibrated inside the cap 30 by driving the vibration member with the pressure of air returned through the air bypass passage 70 and the connection port 42. In this case, in the case of the filter element 50 in which a protector for maintaining the shape is provided on the surface of the filtration part 51, if the protector is directly vibrated, wear of the filtration part 51 can be suppressed. it can.

  DESCRIPTION OF SYMBOLS 10 ... Air cleaner, 20 ... Case, 21 ... Opening, 22 ... Perimeter wall, 23 ... Bottom wall, 24 ... Flange, 25 ... Inlet, 26 ... Discharge hole, 27 ... Dust valve, 28 ... End opening part, 30 ... Cap, DESCRIPTION OF SYMBOLS 31 ... Opening, 32 ... Perimeter wall, 33 ... Top wall, 34 ... Flange, 35 ... Outlet, 40 ... Blower mechanism, 41 ... Housing part, 42 ... Connection port, 43 ... Opening part, 44 ... Partition wall, 45 ... Bearing hole 46 ... Turbine wheel, 47 ... Blower fan, 48 ... Connecting shaft, 50 ... Filter element, 51 ... Filtration part, 52 ... Sealing part, 60 ... Intake passage, 61 ... Supercharger, 62 ... Compressor, 63 ... Throttle Valve, 70 ... air bypass passage, 71 ... air bypass valve.

Claims (6)

An intake passage in which a compressor and a throttle valve constituting the supercharger are provided in order from the upstream side, and a portion between the compressor and the throttle valve in the intake passage communicates with the upstream side of the compressor In addition, an air cleaner that is applied to an internal combustion engine that includes an air bypass passage provided with an air bypass valve and that is provided on the upstream side of the compressor in the intake passage,
A case having an inlet;
A cap having an outlet;
A filter element having a filtration part provided between the opening of the case and the opening of the cap;
The cap is provided with a connection port to which the air bypass passage is connected, and a mechanism that is driven by the pressure of air returned through the connection port to shake off dust accumulated in the filtration unit.
Air cleaner for internal combustion engines. The mechanism includes a blower fan that is rotationally driven by the pressure of air returned through the connection port and blows air toward the filtration unit.
The air cleaner for an internal combustion engine according to claim 1. The cap is provided with an accommodating portion protruding outward,
The blower fan is housed in the housing portion.
An air cleaner for an internal combustion engine according to claim 2. The blower fan is disposed to face the central portion of the filtration unit.
An air cleaner for an internal combustion engine according to claim 2 or claim 3. The case is provided with a dust exhaust valve for discharging dust to the outside.
An air cleaner for an internal combustion engine according to any one of claims 1 to 4. An intake passage for introducing intake air into the combustion chamber of the internal combustion engine;
The air intake passage according to any one of claims 1 to 5, a compressor constituting a supercharger, and a throttle valve are provided in the intake passage in order from the upstream side.
A portion of the intake passage between the compressor and the throttle valve and the connection port provided in the cap of the air cleaner are connected via an air bypass passage,
The air bypass passage is provided with an air bypass valve for releasing pressure between the compressor and the throttle valve in the intake passage.
An intake system for an internal combustion engine.

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