JP2006299931A - Blow-by gas reducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blow-by gas reducing device capable of efficiently sending oil separated in an oil separator to the oil reservoir part side. <P>SOLUTION: A lower end part of an oil level gauge guide 10 is soaked in oil O of an oil pan 7 by using an inside space of the oil level gauge guide 10 as an oil return passage for returning the separated oil to the oil pan 7 to a PCV device 9 having the oil separator 92 for separating the oil from blow-by gas. Thus, even if internal pressure of the oil separator 92 is put in a reducing state, the oil after being separated in the oil separator 92 can be made to smoothly flow down toward the inside space of the oil level gauge guide 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, for example, oil mist (such as mist-like engine oil) contained in blow-by gas of an engine (internal combustion engine) mounted on an automobile or the like is separated by an oil separator, and the blow-by gas after oil separation is separated. The present invention relates to a blow-by gas reduction device (hereinafter referred to as a PCV (Positive Crankcase Ventilation) device) that is sent to an intake system of an engine. In particular, the present invention relates to a measure for efficiently sending separated oil to the oil reservoir side.

  2. Description of the Related Art Conventionally, automobile engines have been provided with a PCV device that guides blow-by gas blown into a crankcase through a gap between a cylinder and a piston to an intake system. That is, by this PCV device, blow-by gas containing carbon monoxide, hydrocarbons, and the like is sent to the combustion chamber through the intake system of the engine, and release of this blow-by gas into the atmosphere is prevented.

  Further, as disclosed in Patent Document 1 below, this PCV device includes an oil separator. The oil separator separates the oil mist contained in the blow-by gas, and the oil is sent to an oil reservoir such as an oil pan. On the other hand, the blow-by gas after the oil mist is separated and removed is used as an intake system of the engine. To be refluxed.

  An oil separating means for separating oil mist is housed inside the oil separator. For example, it is generally known that a plurality of baffle plates are arranged inside the oil separator and the blow-by gas flow path is configured as a maze, or a punching plate and a baffle plate are arranged. Oil mist is captured by the so-called inertial collision action while the gas flows.

  The oil separator may be arranged inside the engine cylinder head cover (hereinafter simply referred to as the head cover) or outside the head cover (for example, between the left and right banks of the V-type engine). Things are known.

On the other hand, in this type of PCV device, it is known to use an oil level gauge guide in order to simplify the configuration. For example, as shown in Patent Literature 2 and Patent Literature 3 below, the inside of the oil separator and the inside of the oil level gauge guide are communicated with each other through a communication pipe, and the blow-by gas in the crankcase is oiled through the oil level gauge guide and the communication pipe. Introduced into the separator. That is, the internal space of the oil level gauge guide is also used as a blow-by gas recovery passage. This eliminates the need for special piping for introducing blow-by gas in the crankcase into the oil separator.
Japanese Utility Model Publication No. 6-45611 Japanese Utility Model Publication No. 4-121414 JP 2004-76627 A

  By the way, this type of PCV device is required to further improve the oil separation efficiency in the oil separator and to reliably prevent the oil mist from flowing into the engine intake system.

  As a means for that purpose, for example, in the case where the blow-by gas flow path is configured in a maze shape by the plurality of baffle plates, the blow-by gas flow path is made more complicated and has a maze shape having a smaller flow path cross-sectional area. Further, in the case where the punching plate and the baffle plate are arranged, the inertial collision action is sufficiently exhibited by further reducing the area of the opening formed in the punching plate and increasing the flow velocity of the blow-by gas passing through the opening. To do.

  However, any of these means leads to an increase in the pressure loss inside the oil separator, leading to a decrease in the oil separator internal pressure. When the internal pressure of the oil separator is thus reduced, there is a possibility that the oil return operation by the oil return passage for returning the separated oil to the oil pan cannot be performed smoothly. In other words, the oil return passage has an upper end communicating with the oil separator and a lower end communicating with the space inside the oil pan. However, as the internal pressure of the oil separator decreases, the pressure below the oil return passage ( The pressure on the oil pan side is significantly higher than the pressure on the upper side (pressure on the oil separator side), and this pressure difference makes it difficult to flow the separated oil toward the oil pan. turn into. In addition, in some cases, the oil may flow backward in the oil return passage. In such a situation, a large amount of liquid oil stays inside the oil separator, and this liquid oil may be sent to the engine intake system together with the blow-by gas.

  As described above, in the conventional PCV device, on the contrary, the means for preventing the oil mist from flowing into the engine intake system (means for sufficiently exerting the inertial collision action) is taken. The oil flow into the engine intake system could be encouraged.

  The present invention has been made in view of such points, and an object of the present invention is to provide a blow-by gas reduction device that can efficiently send oil separated in an oil separator to the oil reservoir portion side. .

  The solution of the present invention devised to achieve the above object includes an oil separator that separates oil mist contained in blowby gas, and the blowby in which oil mist is separated and removed while flowing in the oil separator. A blow-by gas reduction device that sends gas to the intake system of the internal combustion engine and sends separated oil to the oil reservoir side of the internal combustion engine is assumed. With respect to this blow-by gas reducing device, the inside of the oil separator is communicated with the upper end portion or the vicinity of the upper end portion of the oil level gauge guide. Further, the lower end portion of the oil level gauge guide is immersed in the oil in the oil reservoir portion of the internal combustion engine. Thereby, the internal space of the oil level gauge guide is configured as an oil return passage for sending the oil separated by the oil separator to the oil reservoir of the internal combustion engine.

  With this specific matter, the blow-by gas recovered from the crankcase is introduced into the oil separator, and the oil mist is separated and removed while flowing through the blow-by gas flow path in the oil separator. As a method for separating the oil, for example, a plurality of baffle plates can be arranged to make the blow-by gas flow path a maze, or a punching plate and a baffle plate can be arranged to use the inertial collision action. . The blow-by gas after the oil mist is separated and removed is sent to the intake system of the internal combustion engine and burned in the combustion chamber. This prevents the blow-by gas from being released into the atmosphere.

On the other hand, the oil separated in the oil separator flows out from the oil separator. At this time, in the present invention, since the inside of the oil separator communicates with the oil level gauge guide, the oil flowing out from the oil separator flows into the internal space of the oil level gauge guide, and the internal space of the oil level gauge guide Will be sent down to the oil reservoir. Since the lower end of the oil level gauge guide is immersed in the oil in the oil reservoir, the oil existing in the lower part of the internal space of the oil level gauge guide (oil accumulated in the oil reservoir) is oil. The separator internal space and the oil reservoir internal space are blocked. Therefore, even if the internal pressure of the oil separator decreases, the pressure of the oil reservoir that is relatively high pressure does not act on the oil separator. The oil is smoothly discharged from the oil separator and flows down the internal space of the oil level gauge guide. Even when the oil level gauge guide internal space rises due to the pressure in the oil reservoir, the oil level hardly rises to the oil separator installation height. Therefore, liquid oil does not flow back into the oil separator inside the oil level gauge guide. As a result, it is possible to avoid a situation in which liquid oil is sent into the engine intake system together with blow-by gas. As described above, since the oil after separation can be smoothly discharged even in a situation where the internal pressure of the oil separator is reduced, the oil separation efficiency in the oil separator is further enhanced (as described above, the blow-by gas flow path Can be improved in practical use, such as a complicated labyrinth with a small channel cross-sectional area and a configuration in which the area of the opening formed in the punching plate is reduced to increase the flow velocity of blow-by gas passing through the opening). Thus, with this configuration, the oil mist can be reliably separated by the oil separator, and the oil mist can be reliably prevented from flowing into the engine intake system.

  Moreover, the following is mentioned as a more concrete structure of the said oil level gauge guide. The position of the lower opening of the oil level gauge guide immersed in the oil in the oil reservoir is set above the lower end position of the oil level gauge inserted in the oil level gauge guide.

  According to this specific matter, when the oil level gauge is removed, the oil level gauge is removed from the oil level gauge guide, checked for oil level and dirt condition, and then inserted into the oil level gauge guide. The inside of the oil level gauge guide is cleaned by the insertion and removal operation of the oil level gauge. For example, even when foreign matter (sludge or the like) adheres to the inner surface of the oil level gauge guide, the foreign matter can be removed by the insertion / removal operation of the oil level gauge. For this reason, by performing regular oil level inspection work, the oil return passage, which is the internal space of the oil level gauge guide, can be secured without clogging, and the reliability of the oil recovery operation from the oil separator is ensured to be high. be able to.

  As a configuration for more effectively cleaning the inside of the oil level gauge guide by the operation of inserting / removing the oil level gauge, providing the oil level gauge with a brush for cleaning the oil level gauge guide can be mentioned.

In the present invention, the internal space of the oil level gauge guide is used as an oil return passage for returning the separated oil to the oil reservoir with respect to the blow-by gas reduction device having an oil separator for separating the oil from the blow-by gas. In addition, the lower end of the oil level gauge guide is immersed in the oil in the oil reservoir of the internal combustion engine. For this reason, even if the internal pressure of the oil separator decreases, the oil separated in the oil separator can be smoothly flowed toward the internal space of the oil level gauge guide, and from the oil reservoir. Oil backflow can also be suppressed. As a result, it is possible to prevent the liquid oil from staying inside the oil separator, avoiding the situation where the liquid oil is sent into the intake system of the engine together with the blow-by gas, and reducing the output of the internal combustion engine and increasing the oil consumption. An avoidable blow-by gas reduction device can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment demonstrates the case where the PCV apparatus (blow-by gas reduction apparatus) based on this invention is applied to the in-line engine (internal combustion engine) for motor vehicles.

<First Embodiment>
First, the first embodiment will be described. FIG. 1 is a diagram showing a schematic configuration inside the engine when the engine E according to the first embodiment is viewed from a direction along the axis of the crankshaft C. FIG.

-Description of overall engine configuration-
As shown in FIG. 1, the engine E includes a cylinder head 3 installed at the upper end of the cylinder block 1 and a head cover 4 attached to the upper end thereof. The cylinder block 1 is provided with a plurality of (for example, four) cylinders 5, and pistons 51 are accommodated in the cylinders 5 so as to be reciprocally movable. Each piston 51 is connected to the crankshaft C through a connecting rod 52 so that power can be transmitted. Further, a crankcase 6 is attached to the lower side of the cylinder block 1, and a space extending from the lower part in the cylinder block 1 to the inside of the crankcase 6 is a crank chamber 61. Further, an oil pan 7 serving as an oil reservoir is disposed further below the crankcase 6.

  The cylinder head 3 is assembled with an intake valve 32 for opening and closing the intake port 31 and an exhaust valve 34 for opening and closing the exhaust port 33, and is formed between the cylinder head 3 and the head cover 4. The valves 32 and 34 are opened and closed by the rotation of the camshafts 35 and 36 disposed in the cam chamber 41.

  On the other hand, an intake manifold 8 is connected to an intake port 31 formed in the cylinder head 3. The upstream side of the intake manifold 8 communicates with an intake pipe 83 having a surge tank 81 and a throttle valve 82, and an air cleaner 84 is provided on the upstream side of the intake pipe 83. As a result, the air introduced from the air cleaner 84 into the intake pipe 83 is introduced into the intake manifold 8 through the surge tank 81. The cylinder head 3 is provided with an injector (fuel injection valve) 37, and the air introduced into the intake port 31 is mixed with fuel injected from the injector 37 to become an air-fuel mixture, and the intake valve 32 is opened. It will be introduced into the combustion chamber 38 along with the valve. A spark plug 39 is disposed at the top of the combustion chamber 38.

  In the combustion chamber 38, the combustion gas generated by the combustion of the air-fuel mixture accompanying the ignition of the ignition plug 39 passes through the exhaust port 33 as exhaust gas when the exhaust valve 34 is opened, and is then discharged to an exhaust manifold (not shown). The exhaust pipe is discharged to the outside. The exhaust pipe is provided with a catalytic converter (not shown) so that hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxide components (NOx) contained in the exhaust gas are purified. ing.

-Description of PCV device-
Next, the PCV device 9 that is a feature of the present embodiment will be described. The PCV device 9 is for guiding blow-by gas blown into the crank chamber 61 from the gap between the inner surface of the cylinder 5 and the outer surface of the piston 51 to the intake system.

  The PCV device 9 includes a blow-by gas passage 91 for extracting blow-by gas blown into the crank chamber 61, an oil separator 92 for separating oil mist from the blow-by gas extracted by the blow-by gas passage 91, and the oil A blow-by gas supply pipe 93 for guiding blow-by gas from the separator 92 to the intake system and an oil discharge pipe 94 for discharging the oil separated in the oil separator 92 toward the oil pan 7 are provided. Each will be described below.

(Blowby gas passage 91)
The blow-by gas passage 91 is formed as a passage extending in a substantially vertical direction from the cylinder block 1 to the cylinder head 3, whereby the crank chamber 61 and the cam chamber 41 communicate with each other. That is, the blow-by gas in the crank chamber 61 is introduced into the cam chamber 41 by the blow-by gas passage 91 when the blow-by gas is recovered.

(Oil separator 92)
The oil separator 92 is attached to the inner surface (lower surface) of the head cover 4, and includes a separator case 92a and a plurality of baffle plates (oil capturing means) 92b, 92b,... Disposed in the separator case 92a. It is comprised by.

  The separator case 92a is a box-shaped member made of metal and having a substantially rectangular parallelepiped shape whose one end side (the upper side in FIG. 1) is open. The open side is attached to the inner surface of the head cover 4, so A separator chamber (blow-by gas flow path) 92c that is substantially hermetically sealed is formed. Examples of means for attaching the separator case 92a to the inner surface of the head cover 4 include bolting. Here, the separator chamber 92c is formed by the separator case 92a and the inner surface of the head cover 4, but the separator chamber 92c may be formed only by the separator case 92a.

  The separator case 92a has a blow-by gas introduction hole 92d and an oil recovery hole 92f. The head cover 4 has a blow-by gas discharge hole 92e. Hereinafter, each hole will be described.

  The blow-by gas introduction hole 92d is formed on one side surface (the left side surface in FIG. 1) of the separator case 92a, and communicates the separator chamber 92c, which is the internal space of the separator case 92a, with the cam chamber 41. It is.

  The blow-by gas discharge hole 92e is formed on the upper surface of the head cover 4 and is connected to the upstream end of the blow-by gas supply pipe 93. That is, the blow-by gas discharge hole 92e communicates the separator chamber 92c and the intake system of the engine E through the blow-by gas supply pipe 93.

  The oil recovery hole 92f is formed at the lower end of the other side surface (the right side surface in FIG. 1) of the separator case 92a, and is connected to the upstream end of the oil discharge pipe 94. That is, the oil recovery hole 92 f is for discharging oil toward the oil pan 7 through the oil discharge pipe 94.

(Blow-by gas supply piping 93)
As described above, the upstream end of the blow-by gas supply pipe 93 is connected to the blow-by gas discharge hole 92e of the separator case 92a. The downstream end of the blow-by gas supply pipe 93 is connected to the downstream side of the throttle valve 82 in the intake pipe 83. Therefore, the blow-by gas after the oil mist is separated and removed in the oil separator 92 is introduced from the blow-by gas discharge hole 92e to the downstream side of the throttle valve 82 through the blow-by gas supply pipe 93. .

  A PCV valve 95 is provided at the upstream end of the blow-by gas supply pipe 93. When the PCV valve 95 is opened by the intake negative pressure or the like, the blow-by gas in the oil separator 92 flows out into the blow-by gas supply pipe 93 and is introduced into the intake pipe 83 as described above.

  A fresh air introduction pipe 85 is connected to the intake pipe 83 immediately upstream of the throttle valve 82. The other end (downstream end) of the fresh air introduction pipe 85 is communicated with the crank chamber 61 via the cam chamber 41, and fresh air (outside air) is introduced into the crank chamber 61 to ventilate the crank chamber 61. It is possible.

(Oil discharge piping 94)
As described above, the upstream end of the oil discharge pipe 94 is connected to the oil recovery hole 92f of the separator case 92a. As one of the features of this embodiment, the downstream end of the oil discharge pipe 94 is connected to a position near the upper end of the oil level gauge guide 10 into which the oil level gauge 10a is inserted. That is, the internal space (separator chamber 92c) of the separator case 92a and the internal space of the oil level gauge guide 10 are communicated by the oil recovery hole 92f and the oil discharge pipe 94. The oil discharge pipe 94 is arranged so as to be inclined downward toward the oil level gauge guide 10 so that the oil flowing out from the separator case 92a smoothly flows into the internal space of the oil level gauge guide 10. ing.

  As a means for connecting the oil discharge pipe 94 to the separator case 92a and the oil level gauge guide 10, welding is applied when the oil discharge pipe 94 is a metal pipe. In the case of a rubber hose, a pipe member is protruded from the separator case 92a and the oil level gauge guide 10, and an oil discharge pipe 94 is attached to the pipe member.

  Another feature of the present embodiment is that the lower end portion of the oil level gauge guide 10 is immersed in the oil O stored in the oil pan 7. As a result, the oil present in the lower part of the internal space of the oil level gauge guide 10 blocks the internal space of the separator case 92a from the crank chamber 61. That is, even if the internal pressure of the separator case 92a is reduced, the oil level in the internal space of the oil level gauge guide 10 due to the pressure difference (pressure difference between the inside of the separator case 92a and the crank chamber 61). The height position only rises (see the oil level height position in FIG. 1), and the pressure in the crank chamber 61 that has become relatively high pressure does not act on the inside of the separator case 92a. The oil separated in the separator 92 can flow smoothly toward the internal space of the oil level gauge guide 10.

  The capacity of the oil separator 92, the opening size of each of the holes 92d, 92e, and 92f, the shape and the number of baffle plates 92b, and the blow-by gas recovery capability suitable for the exhaust amount of the engine E, the amount of blow-by gas generated, etc. Is appropriately designed so that can be exhibited.

-Operational explanation of PCV device 9-
Next, the operation of the PCV device 9 configured as described above will be described. The blow-by gas blown into the crank chamber 61 through the gap between the cylinder 5 and the piston 51 during the compression stroke or expansion stroke of the engine E is introduced into the separator case 92a through the blow-by gas passage 91 and the cam chamber 41 (see FIG. 1 (see arrow indicated by solid line). This separator case 92
The blow-by gas that has flowed into the separator chamber 92c in a flows into the separator case 92 while colliding with each baffle plate 92b, 92b,..., so that oil mist is captured by a so-called inertial collision action. Thereby, blow-by gas and oil mist are separated.

  Then, the blow-by gas from which the oil mist has been separated and removed reaches the downstream end in the separator case 92a, flows out into the blow-by gas supply pipe 93 with the opening operation of the PCV valve 95, and is introduced into the intake pipe 83 (see FIG. 1 (see arrow indicated by broken line).

  On the other hand, the oil after separation is discharged from the oil recovery hole 92f of the separator case 92a to the oil discharge pipe 94 as shown by the dashed line in FIG. 1, and then passes through the internal space of the oil level gauge guide 10 to the oil pan. It is collected towards 7. Actually, oil exists in the lower part of the internal space of the oil level gauge guide 10, so that the oil that has flowed from the oil discharge pipe 94 into the internal space of the oil level gauge guide 10 Part of the oil remaining in the internal space (oil that was present at the bottom of the internal space of the oil level gauge guide 10) is discharged to the oil pan 7, and the oil level in the internal space of the oil level gauge guide 10 is maintained. Will be.

  The oil level height position in the internal space of the oil level gauge guide 10 is determined by the pressure difference between the internal pressure of the separator case 92a and the internal pressure of the crank chamber 61. Generally, the oil level inspection work by the oil level gauge 10a is executed when the engine E is stopped. At this time, the pressure in the crank chamber 61 has been reduced, and the atmospheric pressure is increased in the internal space of the oil level gauge guide 10, the oil discharge pipe 94, and the oil separator 92 as the oil level gauge 10 a is pulled out. The space, the blow-by gas passage 91 and the crank chamber 61 are introduced, and the pressure inside the separator case 92a and the inside of the crank chamber 61 is equalized. For this reason, the oil level height position of the internal space of the oil level gauge guide 10 substantially coincides with the oil level height position of the oil pan 7, so that the oil amount can be accurately checked.

  Further, along with the blow-by gas reduction operation, fresh air is introduced into the cam chamber 41 and the crank chamber 61 from the fresh air introduction pipe 85, and the chambers 41 and 61 are ventilated.

As described above, in the present embodiment, the oil separated by the oil separator 92 flows into the internal space of the oil level gauge guide 10, and the lower end portion of the oil level gauge guide 10 is It is immersed in the oil O of the oil pan 7. Therefore, the oil existing in the internal space of the oil level gauge guide 10 blocks the internal space of the oil separator 92 and the crank chamber 61. Therefore, even if the internal pressure of the oil separator 92 decreases, the pressure in the crank chamber 61 that is relatively high pressure does not act on the oil separator 92. The separated oil can be smoothly discharged and discharged toward the internal space of the oil level gauge guide 10. Further, even when the oil level height position of the internal space of the oil level gauge guide 10 rises due to the pressure in the crank chamber 61, the oil level height position rises to the installation height position of the oil separator 92. Since the liquid oil does not flow back into the oil separator 92 through the internal space of the oil level gauge guide 10, the liquid oil is sent into the intake system of the engine E together with the blow-by gas. Can be avoided. As described above, in this embodiment, since the oil after separation can be smoothly discharged even in a situation where the internal pressure of the oil separator 92 is lowered, the separator chamber 92c in the oil separator 92 is complicated and has a flow path. It is possible to adopt a configuration that improves oil separation efficiency such as a maze shape with a small cross-sectional area, and oil mist can be reliably separated by the oil separator 92, and the oil mist flows into the intake system of the engine E. Can be reliably prevented, and a decrease in engine output and an increase in oil consumption can be avoided.

Second Embodiment
Next, a second embodiment will be described. The second embodiment is a modification of the connection structure between the oil separator 92 and the oil level gauge guide 10. Other configurations and operations are the same as those of the first embodiment described above. Accordingly, only the connection structure between the oil separator 92 and the oil level gauge guide 10 will be described here.

  FIG. 2 is a cross-sectional view showing the oil separator 92 and its peripheral portion of the engine E according to the second embodiment. The same components as those in the first embodiment described above are denoted by the same reference numerals. Yes. As shown in FIG. 2, the oil level gauge guide 10 according to the present embodiment is connected to the lower end of the separator case 92a. That is, an insertion hole 42 for inserting the oil level gauge 10a is formed on the upper surface of the head cover 4, and an oil recovery hole 92f is formed at the bottom of the separator case 92a corresponding to the insertion hole 42. The upper end portion of the oil level gauge guide 10 is connected to the recovery hole 92f. Also in this embodiment, the lower end of the oil level gauge guide 10 is immersed in the oil O of the oil pan 7 (this lower end is not shown).

  According to this configuration, a special pipe (oil discharge pipe 94 in the first embodiment) for connecting the oil separator 92 and the oil level gauge guide 10 is not necessary, and the number of parts can be reduced. In the configuration of the present embodiment, since the insertion hole 42 for inserting the oil level gauge 10a faces the inside of the oil separator 92, the oil is prevented so as to prevent the discharge of blow-by gas from the insertion hole 42. It is necessary to employ a configuration that can ensure high sealing performance of the seal portion 10e that is provided at the lower end of the grip portion 10d of the level gauge 10a and is fitted into the insertion hole 42.

<Modification>
Next, a modified example of the present invention will be described. The following modification is a modification of the oil level gauge 10a or the oil level gauge guide 10, and other configurations and operations are the same as those of the first embodiment or the second embodiment described above. Accordingly, only the configuration of the oil level gauge 10a or the oil level gauge guide 10 will be described here.

  First, a first modification will be described with reference to FIG. FIG. 3 is a sectional view around the lower end of the oil level gauge guide 10. As shown in this figure, a brush 10b is provided at the tip of the oil level gauge 10a of this modification. By providing such a brush 10b, the oil level gauge 10a is removed from the oil level gauge guide 10, the amount of oil and the condition of dirt are checked, and then the oil level gauge 10a is inserted into the oil level gauge guide 10. When the level check operation is performed, the inner surface of the oil level gauge guide 10 is cleaned by the brush 10b in accordance with the insertion / removal operation of the oil level gauge 10a. For this reason, by performing regular oil level inspection work, the oil return passage, which is the internal space of the oil level gauge guide 10, can be secured without obstruction, and the reliability of the oil recovery operation from the oil separator 92 can be improved. Highly secured.

Next, a second modification will be described with reference to FIG. FIG. 4 is also a sectional view around the lower end of the oil level gauge guide 10. As shown in this figure, the oil level gauge guide 10 of the present modification has its lower end extended to the bottom of the oil pan 7 and is provided with a horizontal portion 10c extending horizontally along the bottom surface of the oil pan 7. It has been. Thus, even when the amount of oil stored in the oil pan 7 is reduced during the operation of the engine E, the lower end opening of the oil level gauge guide 10 can be surely immersed in the oil O. The collection operation can be performed smoothly.

<Other embodiments>
In each of the embodiments and modifications described above, the case where the PCV device 9 according to the present invention is applied to an automotive in-line engine E has been described. The present invention is not limited to this, and can also be applied to an automotive V-type engine, an automotive horizontally opposed engine, and the like. Moreover, it is applicable not only to a gasoline engine but also to a diesel engine. Furthermore, the present invention can be applied not only to automobiles but also to other engines. Further, the number of cylinders, the fuel injection method, and other specifications of the engine E are not particularly limited.

  Further, in each of the above-described embodiments and modifications, the case where the present invention is applied to the PCV device 9 in which the oil separator 92 is installed inside the head cover 4 has been described. The present invention is not limited to this, and can also be applied to a PCV device in which an oil separator is attached between banks of a V-type engine or a PCV device in which the oil separator is separately provided from the engine.

  Furthermore, as an oil trapping means disposed in the separator case 92, a punching plate and a baffle plate are provided, and blow-by gas having an increased flow velocity through the opening of the punching plate is made to collide with the baffle plate. Things may apply. Further, a mesh plate may be employed instead of the punching plate.

It is a figure showing the schematic structure inside the engine which looked at the engine concerning a 1st embodiment from the direction along the axis of a crankshaft. It is sectional drawing which shows the oil separator of the engine which concerns on 2nd Embodiment, and its peripheral part. It is sectional drawing of the lower end part periphery of the oil level gauge guide in a 1st modification. It is sectional drawing of the lower end part periphery of the oil level gauge guide in a 2nd modification.

Explanation of symbols

7 Oil pan (oil reservoir)
9 PCV equipment (blow-by gas reduction equipment)
92 Oil separator 10 Oil level gauge guide 10a Oil level gauge 10b Brush E Engine (internal combustion engine)

Claims (3)

An oil separator for separating the oil mist contained in the blow-by gas is provided, and the blow-by gas from which the oil mist has been separated and removed while flowing in the oil separator is sent to the intake system of the internal combustion engine, and the separated oil is supplied to the internal combustion engine. In the blow-by gas reduction device that sends to the oil reservoir,
The inside of the oil separator communicates with the upper end portion or the vicinity of the upper end portion of the oil level gauge guide, while the lower end portion of the oil level gauge guide is immersed in the oil in the oil reservoir portion of the internal combustion engine. The blow-by gas reduction device, wherein an internal space of the level gauge guide is configured as an oil return passage for sending oil separated by the oil separator to an oil reservoir of an internal combustion engine. In the blowby gas reduction device according to claim 1,
The position of the lower opening of the oil level gauge guide immersed in the oil in the oil reservoir is set above the lower end position of the oil level gauge inserted in the oil level gauge guide. Blow-by gas reduction device. In the blowby gas reduction device according to claim 1 or 2,
The oil level gauge inserted in the oil level gauge guide is provided with a brush for cleaning the inner surface of the oil level gauge guide when being inserted into and removed from the oil level gauge guide. Blow-by gas reduction device.

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