JP2013238113A - Ventilator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a blow-by gas channel from being completely closed, even when a safety valve has an operational failure and is not opened.SOLUTION: A ventilator 1 is configured such that oil is caught and removed by introducing a blow-by gas G of an engine and passing the blow-by gas G through an element 14, and when the element 14 is clogged, the safety valve 24 is opened by pressure of the blow-by gas G and thereby a bypass channel 26 for detouring the element 14 can be opened, wherein the ventilator is provided with a communication flow path 27 having a passage resistance higher than the passage resistance to the element 14 of the blow-by gas G and for bringing an inlet side of the safety valve 24 into communication with an outlet side thereof.

Description

  The present invention relates to a ventilator that captures and removes oil from blow-by gas of an engine.

  The blow-by gas that leaks from the combustion chamber into the crankcase during the compression / combustion stroke of the engine may increase the internal pressure of the crankcase and damage the gas seal. Although it is necessary to do this, blow-by gas contains mist-like oil, which can cause air pollution, so the oil is trapped and removed through the ventilator without opening it to the atmosphere, and then returned to the intake system for recycling. I try to burn it.

  FIGS. 3 and 4 show an example of a conventional general ventilator. This type of ventilator 1 employs a structure in which a cap 2 is detachably attached to an upper portion thereof, and the cap 2 is removed. By opening the upper part of the ventilator 1, internal maintenance and inspection can be performed.

  The blow-by gas G from the crankcase 4 of the operating engine is introduced into the blow-by gas inlet 3 provided on the side of the ventilator 1, and the ventilator 1 is supplied from the blow-by gas inlet 3. The blow-by gas G introduced into the inside flows into the second chamber 7 from the hole 6 while turning in the ring-shaped first chamber 5, and the blow-by gas G flowing into the second chamber 7 flows into the second chamber 7. The oil of a relatively large droplet in the blow-by gas G is captured by the metal filter net 8 made of steel mesh while swirling inside, and then flows into the upper space 10a of the third chamber 10 from the hole 9. It is like that.

  The blow-by gas G flowing into the upper space 10a of the third chamber 10 rises through the central passage 12 at the top of the PCV valve 11 (diaphragm valve), flows into the fourth chamber 13, and enters the fourth chamber 13. The blow-by gas G that has flowed in flows from the hollow portion of the element 14 toward the space 13a outside the element 14, and oil of relatively small droplets is also captured by the element 14, and the space from which the oil has been removed. The blow-by gas G 13 a is discharged from the blow-by gas outlet 15 and returned to the upstream portion of the turbocharger 16.

  The oil trapped in the element 14 and formed into droplets flows down to the space 13a and is collected in the oil collecting portion 17, and when a predetermined amount or more of oil is accumulated in the oil collecting portion 17, the check valve 18 opens, Is made to flow down to an oil passage 19 a provided in the protruding portion 19.

  Further, the oil trapped by the filter mesh 8 in the second chamber 7 flows down from the hole 9, flows down through the upper part of the diaphragm of the PCV valve 11, and joins the oil captured by the element 14. Thus, it is stored in the oil storage section 20 at the bottom.

  When oil accumulates in the oil reservoir 20 over a predetermined amount, the check valve 21 opens, the oil flows down to the oil outlet 22 and is returned to the crankcase 4 through the oil return passage 23 (drain hose). It is like that.

  As prior art document information related to this type of ventilator, there is Patent Document 1 below.

JP 2001-336413 A

  However, in such a conventional ventilator 1, when the element 14 becomes clogged after a period of use, the safety valve 24 on the lower surface of the cap 2 is repelled by the spring 25 due to the pressure of the blowby gas G that has lost its place of travel. The valve is pushed up against the force to open, bypassing the element 14 and opening the bypass path 26 to the space 13a outside the element 14, but the safety valve 24 is malfunctioning. No measures have been taken in the event of the occurrence of a malfunction, so if the safety valve 24 malfunctions and does not open, the blow-by gas G path in the ventilator 1 is completely blocked. As a result, the pressure in the crankcase 4 may increase, and oil leakage from the seal portion may be induced.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent complete blockage of the blow-by gas path even when the safety valve does not open due to malfunction. It is said.

  The present invention introduces an engine blow-by gas and passes the blow-by gas through the element to capture and remove the oil. When the element is clogged, the bypass bypasses the element by opening the safety valve with the pressure of the blow-by gas. A ventilator capable of opening a path, characterized in that a communication flow path having a passage resistance higher than the passage resistance of the element and communicating the inlet side and the outlet side of the safety valve is provided. It is.

  Thus, in this way, even when the element has become clogged after the period of use, even if the safety valve does not open due to some malfunction, Since the inlet side and the outlet side of the safety valve communicate with each other by the path, complete blockage of the blow-by gas path in the ventilator is avoided.

  Also, in the normal use state during the use period of the element, even if there is a communication channel that communicates the inlet side and the outlet side of the safety valve, the passage resistance of the communication channel is higher than the passage resistance of the element. Most of the blow-by gas flows through the element, and the oil in the blow-by gas can be captured and removed by the element as usual.

  Here, when setting the passage resistance of the communication flow path, the internal pressure of the crankcase on the engine side is set to the oil from the seal part under the condition that the passage of blow-by gas to the element and the safety valve is completely impossible. It is preferable to set the passage resistance as high as possible within the range so that the passage rate of the blowby gas with respect to the element is kept as high as possible while keeping it within the range not exceeding the limit pressure causing leakage.

  Note that the passage resistance of the communication flow path can be arbitrarily adjusted by changing the diameter and number of the flow paths according to the holding pressure (seal performance) in the seal portion of the crankcase that is different for each engine. .

  Further, in the present invention, a safety valve is provided on the lower surface of the cap that is detachably attached to the upper portion of the ventilator so that maintenance and inspection work inside the ventilator can be performed, and the opening sealed by the safety valve It is preferable that a communication channel is formed around the portion.

  That is, in a ventilator in which a cap is detachably attached to the upper part so that internal maintenance inspection work can be performed, a safety valve is generally provided on the lower surface of the cap. If a communication channel is drilled around the opening that is sealed by the safety valve, measures can be taken when the safety valve malfunctions by replacing only the cap with the ventilator of an existing vehicle. It becomes possible.

  According to the ventilator of the present invention described above, various excellent effects as described below can be obtained.

  (I) According to the invention described in claim 1 of the present invention, when the element is clogged after a period of use, the safety valve does not open due to a malfunction due to some malfunction. Even if it is, it is possible to avoid the complete blockage of the blow-by gas path in the ventilator by communicating the inlet side and the outlet side of the safety valve by the communication flow path. Oil leakage can be prevented in advance.

  (II) According to the invention described in claim 2 of the present invention, it is possible to take measures against malfunction of the safety valve by exchanging only the cap with respect to the ventilator of the existing vehicle. This eliminates the need to reduce the cost of the countermeasure.

It is sectional drawing which shows an example of the form which implements this invention. It is an arrow view of the II-II direction of FIG. It is an external view which shows an example of a general ventilator. It is sectional drawing of the ventilator of FIG.

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

  FIG. 1 and FIG. 2 show an example of an embodiment for carrying out the present invention, and parts denoted by the same reference numerals as those in FIG. 3 and FIG.

  As shown in FIG. 1, in this embodiment, as in the case of the conventional example of FIGS. 3 and 4, oil is introduced by introducing the blowby gas G of the engine and passing the blowby gas G through the element 14. With respect to the ventilator 1 that has been trapped and removed, and when the element 14 is clogged, the safety valve 24 can be opened by the pressure of the blow-by gas G so as to bypass the element 14. A feature is that a communication flow path 27 having a higher passage resistance and communicating the inlet side and the outlet side of the safety valve 24 is provided.

  In the case of the example shown here, the safety valve 24 has a piston type with a guide rod 28 projecting from the upper surface, and the guide is guided against the boss portion 29 positioned inside the cap 2 by a support portion (not shown). The rod 28 is inserted so as to be slidable in the vertical direction, so that the lifting operation of the safety valve 24 is guided.

  Further, a spring 25 is interposed between the safety valve 24 and the boss portion 29, and the safety valve 24 is urged downward by the repulsive force of the spring 25, and the element 14 The safety valve 24 is seated on a valve seat portion 31 that is recessed in the central portion of the presser plate 30 that fixes the upper end of the presser plate 30. The seating of the safety valve 24 opens the opening portion of the valve seat portion 31. 32 is sealed to be in a valve-closed state, and the opening 32 is opened by being lifted from the valve seat portion 31 of the safety valve 24 to be in a valve-open state.

  As shown in the arrow view in the II-II direction of FIG. 1 in FIG. 2, the communication channel 27 described above is provided around the opening 32 sealed by the safety valve 24. An appropriate passage resistance higher than the passage resistance of the element 14 is set by changing the diameter and number of the flow paths.

  Reference numeral 33 in FIG. 1 denotes a spring that is interposed between the presser plate 30 and the ceiling surface of the cap 2 and biases the presser plate 30 downward. The upper end of the element 14 is fixed.

  Thus, in this way, when the element 14 becomes clogged after a period of use, the safety valve 24 malfunctions due to problems such as oil adhesion or foreign matter biting, and the valve is opened. Even in such a situation, since the inlet side and the outlet side of the safety valve 24 are communicated with each other by the communication flow path 27, the blockage of the blow-by gas G path in the ventilator 1 is avoided.

  Further, in a normal use state within the usage period of the element 14, even if there is a communication channel 27 that communicates the inlet side and the outlet side of the safety valve 24, the passage resistance of the communication channel 27 is the passage resistance of the element 14. Since it is higher, most of the blow-by gas G flows through the element 14, and the oil in the blow-by gas G can be captured and removed by the element 14 as usual.

  Here, in setting the passage resistance of the communication flow path 27, the crankcase 4 on the engine side (FIG. 3) under the condition that the passage of the blow-by gas G to the element 14 and the safety valve 24 is completely impossible. The reference pressure is set within a range that does not exceed the limit pressure that causes oil leakage from the seal portion, and the maximum passage resistance is set within that range, and the passage rate of the blow-by gas G to the element 14 is as much as possible. It is preferable to keep it high.

  Note that the passage resistance of the communication flow path 27 is arbitrary by changing the diameter and number of the flow paths according to the holding pressure (seal performance) at the seal portion of the crankcase 4 (see FIG. 3) that differs for each engine. Can be adjusted.

  Further, in the ventilator 1 in which the cap 2 is detachably attached to the upper part so that the internal maintenance inspection work as in this embodiment can be performed, a safety valve 24 is generally provided on the lower surface of the cap 2. Therefore, if the communication flow path 27 is formed around the opening portion 32 sealed by the safety valve 24, the safety valve 24 can be replaced by replacing only the cap 2 with the ventilator 1 of the sold vehicle. It is possible to take measures against malfunctions.

  Therefore, according to the above embodiment, even when the element 14 is clogged after the period of use, even if the safety valve 24 is not operated due to some malfunction, Since the flow path 27 allows the inlet side and the outlet side of the safety valve 24 to communicate with each other to prevent complete blockage of the path of the blow-by gas G in the ventilator 1, the pressure rise in the crankcase 4 (see FIG. 3). Oil leakage from the seal portion due to can be prevented in advance.

  Moreover, since it is possible to take measures against malfunction of the safety valve 24 by exchanging only the cap 2 with respect to the ventilator 1 of the already-sold vehicle, it is not necessary to replace the entire ventilator 1 and the cost for the countermeasure is reduced. Significant reduction can be achieved.

  In addition, the ventilator of this invention is not limited only to the above-mentioned example, Of course, various changes can be added within the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Ventilator 2 Cap 14 Element 24 Safety valve 26 Bypass path 27 Communication flow path 32 Opening part G Blow-by gas

Claims (2)

  Oil is trapped and removed by introducing engine blow-by gas and passing the blow-by gas through the element, and when the element is clogged, the safety valve is opened by the pressure of the blow-by gas and a bypass path that bypasses the element is opened. A ventilator that is obtained by providing a communication flow path that has a passage resistance higher than a passage resistance with respect to an element of blow-by gas and communicates an inlet side and an outlet side of the safety valve.   A safety valve is provided on the lower surface of the cap that is detachably attached to the upper part so that internal maintenance and inspection work can be performed, and a communication channel is provided around the opening sealed by the safety valve. The ventilator according to claim 1, wherein:

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