JP6355420B2 - Ventilator - Google Patents

Description

  The present invention relates to a ventilator.

  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. 9 and 10 show an example of a conventional ventilator, which is a type of ventilator 3 mounted on the upper surface of the head cover 2 of the engine 1, and the blow-by gas extracted from the head cover 2 is indicated by a solid arrow A. In this way, after flowing through the normal path 4 and passing through the element 5 interposed in the normal path 4 to capture and remove the oil, it is sent out from the ventilator 3 to the intake system (not shown) via the gas communication pipe 6. It is.

  In such a ventilator 3, there is a possibility that the blow-by gas cannot pass through the element 5 due to clogging after the use period, and as a countermeasure when such a situation occurs, A bypass path 7 that bypasses the element 5 as shown by an arrow B is formed, and when the pressure of the blow-by gas in the normal path 4 rises due to the clogging of the element 5, the bypass valve 8 opens to open the blow-by. Gas can be guided to the bypass path 7.

  FIGS. 11 and 12 are enlarged views showing a specific structure of the bypass valve 8. The bypass valve 8 shown here connects the normal path 4 and the bypass path 7 upstream of the normal path 4. FIG. A housing 9 is fitted in and attached to the partitioning hole of the partition wall, the valve body 10 is accommodated in the housing 9 so as to be movable up and down, and the valve body 10 is directed upward by a resilient body 11 such as a coil spring. The communication port 12 is opened in the ceiling portion of the housing 9 and the valve seat 13 is left around the communication port 12, and is pushed up by the projectile 11 to rise. The peripheral edge of the upper surface of the valve body 10 comes into contact with the valve seat 13 from below to close the communication port 12.

  Here, on the side surface of the housing 9 below the ceiling, open portions 14 are provided at a plurality of locations in the circumferential direction, and blow-by gas guided from the communication port 12 when the valve is opened is contained in the housing 9. The gap around the valve element 10 flows as a flow passage and is sent out from the opening portion 14 to the bypass passage 7.

  As prior art document information related to a general ventilator, there is Patent Document 1 below.

JP 2013-238113 A

  However, in the ventilator 3 employing the bypass valve 8 as described above, the bypass valve 8 is normally closed, and the upper surface of the valve body 10 has a step with respect to the valve seat 13 on the outer peripheral portion of the communication port 12. Therefore, the water and condensation water in the blow-by gas accumulate on the upper surface of the valve body, and the accumulated water freezes in the severe winter season, so that the valve body 10 is fixed to the valve seat 13. This may cause the bypass valve 8 to be inoperative, and if the bypass valve 8 becomes inoperative due to freezing when the element 5 is clogged and cannot be opened, the blow-by gas in the ventilator 3 may not be opened. There is a concern that the pressure in the crankcase of the engine 1 rises and induces oil leakage from the seal portion.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a ventilator that can eliminate the possibility of the bypass valve becoming inoperable due to freezing in the severe winter season.

The present invention introduces an engine blow-by gas and passes the blow-by gas through the element to capture and remove oil. When the element is clogged, the bypass valve is opened by the pressure of the blow-by gas to bypass the element. A ventilator capable of opening a path, wherein a housing having a valve seat around it is opened in the ceiling and an open part is provided at a position below the ceiling, and the flow of blow-by gas around A valve body that is accommodated in the housing so as to be able to move up and down while ensuring a gap to be a path and that abuts the upper peripheral portion of the valve seat against the valve seat when it is lifted, and urges the valve body upward. the configure bypass valve, the top rim of the locally mountain fold on to the valve body portion of the circumferential direction of the valve seat by a stowed bullet inducer in said housing as In which it is formed a drain hole, characterized in that the water drain hole was allowed communication with the gap around the valve body in the housing between.

  Thus, in this way, even if moisture or condensed water in the blow-by gas adheres to the upper surface of the valve body that is normally closed, the water is withdrawn from time to time through the drain hole. Therefore, water does not accumulate on the upper surface of the valve body surrounded by the valve seat, and the possibility that the bypass valve becomes inoperable due to freezing in the severe winter season is eliminated.

  The larger the drainage hole, the better the water drainage on the upper surface of the valve body, but in the normal use state within the period of use of the element, a part of the blowby gas passes through the drainage hole. Since it becomes easy to be guided to the bypass path, the blow-by gas passing through the element is reduced and the efficiency of oil capture and removal is reduced, so the drain hole is the minimum necessary to ensure good water drainage It is necessary to form with the size of.

Also, in the locally mountain fold a part of the circumferential direction of the valve seat to form a drain hole between the top rim portion of the valve body, the water drain hole into the gap around the valve body in the housing Since the communication is made possible, it is possible to take measures against malfunction of the bypass valve only by partially improving the valve seat of the bypass valve housing with respect to the ventilator of the already sold vehicle.

  Furthermore, when the drainage hole is formed in this way, it is preferable that the drainage hole is formed in a triangular pyramid shape such that the cross-sectional area of the flow path gradually decreases toward the radially outer side of the communication port. By doing so, it is possible to easily increase the opening area of the frontage by widening the base of the cross-sectional shape of the mountain shape of the drainage hole, and to increase the volume change from the deepest part to the frontage as much as possible. In the drain hole, and the weight of the water itself is applied to encourage the flow from the deepest part of the drain hole to the gap around the valve body in the housing, so that the water stays in the drain hole. It becomes difficult to improve the drainage from the drain hole.

  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, it is possible to eliminate the possibility that the bypass valve becomes inoperative due to freezing in the severe winter season, so that the flow of blow-by gas in the ventilator is completely blocked. Can be avoided, and oil leakage from the seal portion due to an increase in pressure in the crankcase can be prevented in advance.

(II) According to the invention described in claim 1 of the present invention, it is possible malfunction measures of the bypass valve by simply applying a partial improvement over ventilator existing vehicles on the valve seat of the housing of the bypass valve Therefore, it is possible to significantly reduce the cost for countermeasures against malfunction of the bypass valve.

(III) According to the invention described in claim 2 of the present invention, it is possible to make it difficult for water to stay in the drainage hole and to improve the drainage from the drainage hole. It is possible to more surely eliminate the danger that the bypass valve will become inoperable due to freezing by quickly discharging, and the danger that water will freeze in the drain hole.

It is a perspective view which shows an example of the form which implements this invention. It is sectional drawing which shows the detail of the bypass valve of FIG. It is sectional drawing which expands and shows the detail of the drain hole of FIG. FIG. 4 is an arrow view in the IV-IV direction of FIG. 3. It is sectional drawing which expands and shows the detail of the drain hole of the comparative example 1. FIG. 6 is an arrow view in the VI-VI direction of FIG. 5. It is sectional drawing which expands and shows the detail of the drain hole of the comparative example 2. It is an arrow directional view of the VIII-VIII direction of FIG. It is a perspective view which shows the external appearance of a prior art example. It is sectional drawing which shows the detail of the ventilator of FIG. It is a perspective view which shows the detail of the bypass valve of FIG. It is sectional drawing which shows the detail of the bypass valve of FIG.

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

  1 to 4 show an example of an embodiment for carrying out the present invention, and portions denoted by the same reference numerals as those in FIGS. 9 to 12 represent the same items.

  As shown in FIGS. 1 to 4, in this embodiment, the element 5 (see FIG. 9) is related to the ventilator 3 (see FIGS. 9 and 10) configured substantially the same as that in FIGS. 9 to 12 described above. A bypass valve 8 that is opened by blow-by gas pressure when clogged, a housing 9 having a communication port 12 provided with a valve seat 13 around the opening in the ceiling, and an opening provided below the ceiling; A valve body 10 that secures a gap as a flow passage for blow-by gas around the housing 9 and is accommodated in the housing 9 so as to be able to move up and down; The valve body 10 is constituted by the elastic body 11 accommodated in the housing 9 so as to urge the valve body 10 upward. Water drainage hole between the upper peripheral edge of the body 10 5 is formed such that the drainage hole 15 communicates with a gap around the valve body 10 in the housing 9, and the drainage hole 15 is formed on the radially outer side of the communication port 12. It is formed in the shape of a triangular pyramid whose flow path cross-sectional area gradually decreases.

  Thus, even if moisture or condensed water in the blow-by gas adheres to the upper surface of the valve body 10 that is normally closed, the water is withdrawn through the drain hole 15 at any time. Therefore, water does not accumulate on the upper surface of the valve body 10 surrounded by the valve seat 13, and the possibility that the bypass valve 8 becomes inoperable due to freezing in the severe winter season is eliminated. .

  Note that the larger the drainage hole 15 is, the better the water drainage of the upper surface of the valve body 10 is. However, in the normal use state of the element 5 during the use period, the blowby gas passes through the drainage hole 15. Is easily guided to the bypass path 7 (see FIG. 10), the blow-by gas passing through the element 5 is reduced, and the efficiency of oil capture and removal is reduced. It is necessary to form it with the minimum necessary size that can ensure the discharge of water.

  Further, particularly in this embodiment, a part of the valve seat 13 in the circumferential direction is locally folded and a drain hole 15 is formed between the upper peripheral edge of the valve body 10, and the drain hole 15 Is communicated with the clearance around the valve body 10 in the housing 9, so that countermeasures against malfunctions of the bypass valve 8 can be taken only by partially improving the vent seat 3 of the bypass valve 8 in the housing 9 of the bypass valve 8. It becomes possible to take.

  Furthermore, in the case of this embodiment, the drain hole 15 is formed in a triangular pyramid shape such that the cross-sectional area of the channel gradually decreases toward the outside in the radial direction of the communication port 12. It is possible to easily increase the opening area of the frontage by widening the skirt of the cross-sectional shape of the above, taking in as much water as possible into the drainage hole 15 by increasing the volume change from the deepest part to the frontage, The weight of the water itself is used to encourage the flow from the deepest part of the drain hole 15 to the gap around the valve body 10 in the housing 9, making it difficult for water to stay in the drain hole 15. It becomes possible to make the dischargeability from the punched hole 15 favorable.

  In fact, in the experiment by the present inventors, when the shape of this embodiment as shown in FIG. 3 and FIG. 4 is adopted, a state where the hollow shape of the upper surface of the valve body 10 surrounded by the valve seat 13 is filled with water. As a result of measuring the time of draining as follows, quick drainage within 30 seconds could be confirmed, but the sectional shape of the deepest part of the minimum flow passage as shown in FIGS. In the drain hole 15 'of Comparative Example 1 having a rectangular cross-section with the shape kept uniform, it took 60 seconds or more for the water to escape.

  In addition, a comparative example in which the minimum channel cross-sectional area at the deepest part as shown in FIGS. In the water drain hole 15 ″, it took 30 seconds or more for the water to drain completely, and although it did not take up to 60 seconds, it was confirmed that the water drainage was worse compared to this embodiment.

  Whether or not water can be quickly discharged is an important factor in evaluating the risk of freezing. If it takes time for water to drain completely, the risk that the bypass valve 8 may become inoperable due to freezing. However, if the water can be quickly drained as in the present embodiment, these risks are hardly a concern. It is considered to be a level that can be completed.

  As described above, according to the above-described embodiment, the possibility that the bypass valve 8 may become inoperable due to freezing in the severe winter season can be eliminated, so that the flow of blow-by gas in the ventilator is completely blocked. The situation can be avoided, and oil leakage from the seal portion due to an increase in pressure in the crankcase can be prevented in advance.

  In addition, since it is possible to take measures against malfunction of the bypass valve 8 only by partially improving the valve seat 13 of the housing 9 of the bypass valve 8 with respect to the ventilator of the already sold vehicle, The cost can be greatly reduced, and the water can hardly stay in the drain hole 15 and the drainage from the drain hole 15 can be made excellent. It is also possible to more reliably eliminate the danger that the bypass valve 8 may become inoperable due to freezing and the water that freezes in the drain hole 15.

  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.

3 Ventilator 5 Element 6 Gas communication pipe 7 Bypass path 8 Bypass valve 9 Housing 10 Valve body 11 Ejection body 12 Communication port 13 Valve seat 14 Opening part 15 Drain hole

Claims (2)

Oil is captured and removed by introducing blow-by gas of the engine and passing the blow-by gas through the element, and when the element is clogged, the bypass valve is opened by the pressure of the blow-by gas to open the bypass path bypassing the element A ventilator configured to obtain a housing having a communication port provided with a valve seat around the ceiling and having an opening at a position below the ceiling, and a gap serving as a blow-by gas flow passage around the housing And a valve body that is accommodated in the housing so as to be able to move up and down, and that closes the communication port by abutting the peripheral edge of the upper surface with respect to the valve seat, and in the housing to urge the valve body upward said bypass valve is constituted by a bullet inducer housed in a portion of the circumferential direction of the valve seat between the top rim portion of the locally mountain fold on to the valve body The vent hole is formed, characterized in that the water drain hole was allowed communication with the gap around the valve body in the housing ventilator. The ventilator according to claim 1 , wherein the drainage hole is formed in a triangular pyramid shape such that the cross-sectional area of the flow path gradually decreases toward the outside in the radial direction of the communication port.

Images