JP2018100608A - Oil separator - Google Patents

Abstract

To provide an oil separator capable of eliminating a metal rib even when set on a side surface of an engine block. Both the front separator 30 and the rear separator 40 are composed of resin parts only. Therefore, unlike the case where the engine block is provided with a continuous rib in the circumferential direction and the space surrounded by the side surface of the engine block, the rib and the resin cover is used as a front separator (conventional), the engine block is integrated with the engine block. The rib provided in the circumferential direction can be eliminated. [Selection] Figure 3

Description

  The present invention relates to an oil separator, and more particularly to an oil separator set on a side surface of an engine block.

In an internal combustion engine, for example, an automobile engine or the like, during operation, it is assumed that discharging blowby gas that leaks from the gap between the piston ring and the cylinder wall into the atmosphere causes air pollution. A case ventilation) system is used to return to the intake system and re-burn.
By the way, the blow-by gas contains oil mist obtained by atomizing lubricating oil such as engine oil. Therefore, as means for separating and collecting oil mist in blow-by gas, an oil mist collecting device (oil separator) is installed on the inner side of the cylinder head cover or on the side of the engine block in the middle of the connecting flow path connecting the crankcase and the intake passage. Is provided.

  When the oil separator is provided on the side surface of the engine block, not only the atomized oil mist but also a large amount of liquid oil obtained by aggregating the oil stirred by the crankshaft enters the oil separator. Therefore, the oil separator is required not only to collect atomized oil mist but also to collect a large amount of liquid oil.

  Patent Document 1 discloses an oil separator that is provided on a side surface of an engine block, and has an ability to collect finely divided oil mist as well as a large amount of liquid oil. ing.

  In the oil separator disclosed in Patent Document 1, as shown in FIGS. 8 and 9, a metal rib 1 b that is continuous in the circumferential direction is integrally provided on the side surface 1 a of the engine block 1 to form a resin cover. 2 is covered. The space S2 surrounded by the side surface 1a, the rib 1b and the cover 2 of the engine block 1 is used as a pre-separator (pre-separator) for collecting a large amount of liquid oil, and the cyclone separator 3 attached to the cover 2 is made of oil mist. Used to collect.

However, the technique disclosed in Patent Document 1 has the following problems.
(A) Since the metal ribs 1b are continuously provided in the circumferential direction, the ribs 1b may block engine knock waves depending on the position of the knock sensor attached to the side surface 1a of the engine block 1. . In that case, detection with a knock sensor becomes difficult, and it takes time to detect and adjust the sensor.
(B) Since the metal ribs 1b are continuously provided in the circumferential direction, it is difficult to reduce the weight of the oil separator.
(C) Since the ribs 1b made of metal are continuously provided in the circumferential direction, a relatively large number (patents) are attached in order to assemble the cover 2 to the engine block 1 while ensuring the seal between the rib 1b and the cover 2. In the case of Literature 1 disclosure, 8 bolts 3a to 3h are required.

JP 2013-199897 A

  An object of the present invention is to provide an oil separator capable of eliminating metal ribs even when set on the side of an engine block.

The present invention for achieving the above object is as follows.
(1) A resin oil separator disposed outside the engine block and assembled to a side surface of the engine block,
A first introduction hole and a second introduction hole for introducing the oil mixed gas in the engine block into the oil separator;
A pre-stage separator that mainly collects liquid oil from the oil mixed gas introduced from the first and second introduction holes;
A downstream separator that is disposed downstream from the upstream separator and mainly collects oil mist that flows without being collected by the upstream separator;
A gas discharge hole that is formed on the downstream side of the rear separator and discharges the gas from which the oil has been separated by the front separator and the rear separator to the outside of the oil separator;
Have
An oil separator in which the front-stage separator and the rear-stage separator are both made up of only resin parts.
(2) The pre-stage separator is above the lower one of the first and second introduction holes where the amount of liquid oil introduced is larger and below, and is liquid among the first and second introduction holes. The oil separator according to (1), including an inclined rib portion extending in a direction approaching the introduction hole having a smaller amount of oil introduction.
(3) The latter-stage separator is a labyrinth type separator, and is connected to the upstream chamber on one side in the thickness direction of the oil separator and the downstream end of the upstream chamber on the other side in the thickness direction of the oil separator. The oil separator according to (1) or (2), wherein the oil separator has a two-layer structure including a downstream chamber connected to the gas discharge hole at a downstream end.
(4) The oil according to (3), wherein the flow passage cross-sectional area at the downstream end of the downstream chamber is larger than the flow passage cross-sectional area of the downstream chamber located upstream from the downstream end. Separator.
(5) The oil separator according to (3) or (4), wherein the oil separator is assembled to the engine block in a posture in which the thickness direction is inclined from a horizontal direction, and the downstream chamber is above the upstream chamber. Oil separator.

According to the oil separator of the above (1), the following effects can be obtained.
Since both the front separator and the rear separator are made of only resin parts, the engine block is provided with a rib that is continuous in the circumferential direction, and the space surrounded by the engine block side, rib, and resin cover Unlike the case of using as a separator (conventional), the circumferentially continuous rib provided integrally with the engine block can be eliminated. In addition, since the rib provided in an engine block can be abolished, it can suppress that (i) a rib interrupts | blocks a knock wave of an engine. Further, (ii) it is possible to reduce the weight of the oil separator as compared with the case where ribs are provided. Furthermore, (iii) a sealing structure of ribs and resin oil separators continuous on the entire circumference is not required, and as a result, only the periphery of each of the first and second introduction holes and the gas discharge hole is sealed. Since it is good, the seal length can be shortened, and the number of fastening bolts for assembling the resin oil separator to the engine block can be reduced while ensuring the sealing performance.

According to the oil separator of the above (2), the following effects can be obtained.
The liquid oil introduced into the pre-stage oil separator from the introduction hole with the larger amount of liquid oil introduced into the upstream oil separator collides with the inclined rib portion, and is guided along the inclined rib portion and below the amount of liquid oil introduced. It flows toward the smaller introduction hole. Therefore, the liquid oil introduced into the oil separator can be efficiently discharged out of the oil separator from the introduction hole with the smaller introduction amount.

According to the oil separator of the above (3), the following effects can be obtained.
Since it has a two-layer structure, the flow path length of the rear separator can be increased, and the oil separation performance by the rear separator can be enhanced. Note that the two-layer structure reduces the cross-sectional area of the flow path compared to the case of the single-layer structure, but the oil mist after the liquid oil is separated by the front separator instead of the front separator through which a large amount of liquid oil flows. Since it is a post-stage separator that flows, it is possible to suppress clogging of the flow path with oil even when the cross-sectional area of the flow path is narrowed with a two-layer structure.

According to the oil separator of the above (4), the following effects can be obtained.
Since the flow passage cross-sectional area at the downstream end of the downstream chamber is larger than the flow passage cross-sectional area of the downstream chamber portion upstream of the downstream end, it flows through the downstream chamber to the gas discharge hole. The gas flow rate can be reduced at the downstream end of the downstream chamber. Therefore, it can suppress that the oil isolate | separated with the oil separator is carried away by the gas exhaust hole.

According to the oil separator of the above (5), the following effects can be obtained.
The oil separator is assembled to the engine block with the thickness direction inclined from the horizontal direction, and the downstream chamber is above the upstream chamber, so that the downstream chamber and the upstream chamber are at the same height. Furthermore, an oil separation effect due to the gravity drop effect of the oil itself can be obtained by the labyrinth-type rear separator.

It is a front view of the state assembled to the side of an engine block of an oil separator of an example of the present invention. It is the elements on larger scale of only the engine block in which the oil separator of the present invention example is assembled. It is a disassembled perspective view of the oil separator of an Example of this invention. It is a front view of the state which omitted the 3rd piece only with the 1st and 2nd piece of the oil separator of the present invention example. It is an AA line expanded sectional view of FIG. It is a BB line expanded sectional view of Drawing 1. It is an expanded sectional view showing the state where the thickness direction of the oil separator of the example of the present invention inclines from the horizontal direction. It is a partial enlarged front view of the conventional oil separator. It is side sectional drawing of the conventional oil separator.

  Below, with reference to FIGS. 1-7, the oil separator of the Example of this invention is demonstrated. In the drawing, UP indicates the upper side (the upper side of the vehicle).

  An oil separator 10 according to an embodiment of the present invention separates oil (oil mist) from an oil mixture gas (blowby gas) generated in a crankcase of an automobile engine (not shown) and returns the separated oil to the crankcase. It is.

  As shown in FIG. 1, the oil separator 10 is formed separately from the engine block 100, and is disposed outside the engine block 100 and assembled to the side surface 100 a of the engine block 100. The engine block 100 is composed of an engine cylinder head, a cylinder block, and a crankcase, although not specifically shown. The oil separator 10 is made of resin. However, the oil separator 10 may be made of metal.

The oil separator 10 has a multi-part configuration that is separately molded and then fixed by vibration welding (vibration welding) or the like. In the embodiment of the present invention and the illustrated example, a case of a three-part configuration will be described as an example. However, a two-part configuration may be used, or four or more parts may be used.

  As shown in FIG. 3, the oil separator 10 has a three-part configuration including a first piece 10a, a second piece 10b, and a third piece 10c. The oil separator 10 is fixedly attached to the engine block 100 with a bolt 110 (see FIG. 1) and a collar 110a (see FIG. 3) for metal touch with the first piece 10a. The second piece 10b is fixed and attached to the first piece 10a in the same direction as the assembly direction of the first piece 10a to the engine block 100 without using a fastening member by vibration welding or the like. The third piece 10c is vibration welded to the second piece 10b in the same direction as the assembly direction of the first piece 10a to the engine block 100 (that is, the assembly direction of the second piece 10b to the first piece 10a). And fixed without using a fastening member. Therefore, the assembly directions of the first, second, and third pieces 10a, 10b, and 10c are all the same direction (single direction), and the assembly of the oil separator 10 and the assembly of the oil separator 10 to the engine block 100 are performed. Is facilitated. The assembly direction is parallel to the thickness direction D of the oil separator 10.

  The oil separator 10 includes (i) first and second introduction holes 21 and 22 for introducing the oil mixed gas in the engine block 100 into the oil separator 10, and (ii) first and second introduction holes 21 and 22. A pre-stage separator 30 that mainly collects liquid oil from the introduced oil mixed gas; and (iii) disposed downstream of the pre-stage separator 30 in the gas flow direction in the oil separator 10 and is collected by the pre-stage separator 30. A rear separator 40 that mainly collects the oil mist that flows without being removed, and (iv) a gas formed downstream of the rear separator 40 in the gas flow direction and separated from the oil by the front separator 30 and the rear separator 40 And a gas discharge hole 50 for discharging to the outside of the separator 10.

  The first and second introduction holes 21 and 22 are formed at or near the lower end of the oil separator 10. The first and second introduction holes 21 and 22 are provided at positions including the lowermost part of the internal space of the oil separator 10. The first and second introduction holes 21 and 22 are respectively communicated with first and second introduction passages 101 and 102 (see FIG. 2) provided in the engine block 100 so as to communicate with the inside of a crankcase (not shown). Yes. The first and second introduction holes 21 and 22 and the first and second introduction passages 101 and 102 allow oil separated from blow-by gas by the oil separator 10 from the internal space of the oil separator 10 to the internal space of the crankcase. It is also used as a discharge path (drain) that discharges toward. As shown in FIG. 3, the first and second introduction holes 21 and 22 are formed in the first piece 10 a and are spaced from each other at the same or substantially the same height position. The first and second introduction holes 21 and 22 are formed through the first piece 10 a in a direction parallel to the thickness direction D of the oil separator 10.

  The front separator 30 is a space into which the oil mixed gas introduced into the oil separator 10 from the first and second introduction holes 21 and 22 flows first. First and second introduction holes 21 and 22 are provided at the lowermost portion of the front separator 30. The front separator 30 is formed of the first and second pieces 10a and 10b. In order to relatively increase the capacity of the front separator 30, the second piece 10b has a recess 10b1 that is recessed in a direction away from the first piece 10a. Is provided.

The front separator 30 is located above and below the first introduction hole 21 that is the introduction hole with the larger amount of liquid oil introduced between the first and second introduction holes 21 and 22 and the first and second introduction holes. 21 and 22 has an inclined rib portion 31 extending in a direction approaching the second introduction hole 22 which is the introduction hole with the smaller amount of liquid oil introduced. The inclined rib 31 extends from one of the first and second pieces 10a and 10b toward the other of the first and second pieces 10a and 10b, and is fixed to the other piece by welding or the like at the tip. . The inclined rib 31 may be located directly above the first piece 10a, or may be located only obliquely above. A relatively large amount of liquid oil introduced from the first introduction hole 21 hits the inclined rib 31. For this reason, the liquid oil introduced from the first introduction hole 21 is suppressed from flowing to the rear separator 40 by the inclined rib 31.

  The upstream separator 30 may be provided with a rib 32 also above the second introduction hole 22 which is the introduction hole with the smaller amount of liquid oil introduced between the first and second introduction holes 21 and 22. desirable. This is because the provision of the ribs 32 prevents the liquid oil introduced from the second introduction holes 22 from hitting the ribs 32 and flowing to the rear separator 40.

  The liquid oil separated (collected hereinafter, the same applies hereinafter) by the front separator 30 flows toward the bottom of the front separator 30 by its own weight, and the first and second introduction holes 21 and 22 (mainly Is discharged out of the oil separator 10 through the second introduction hole 22). Further, the oil (oil mist) that could not be separated by the front separator 30 flows into the rear separator 40 above the front separator 30.

  The post-stage separator 40 is a labyrinth type separator provided mainly to separate oil mist from the oil mixed gas. However, the rear separator 40 may be a cyclone separator or an inertial collision separator. Note that the labyrinth type partitions the separator internal space partially, lengthens the flow path length of the oil mixed gas in the separator to encourage the oil to fall by its own weight, and partially separates the separator internal space. In this method, the oil mixed gas flow rate is increased to encourage the oil to collide with the separator wall surface. The cyclone type is a method in which the oil mixed gas is swirled and the oil is separated from the oil mixed gas by the centrifugal force generated by the swirling motion. In addition, the inertial collision type is a system in which a collision plate that collides with oil is provided, and an oil mixed gas is caused to collide with the collision plate to adhere and separate the oil.

  The rear separator 40 includes an inlet portion 41 that receives the oil mixed gas that has passed through the front separator 30, an upstream chamber 42 on one side in the thickness direction D of the oil separator 10, and the other side in the thickness direction D of the oil separator 10. And a certain downstream chamber 43. That is, the rear separator 40 has a two-layer structure of an upstream chamber 42 and a downstream chamber 43 as shown in FIG.

  As shown in FIG. 3, the inlet 41 is a hole formed in the second piece 10 b. The inlet 41 is formed through the second piece 10 b in a direction parallel to the thickness direction D of the oil separator 10. The reason why the inlet 41 is a hole penetrating in the thickness direction D instead of the vertical direction is that the liquid oil in the front separator 10 is less likely to enter the rear separator 40 than in the case of the vertical hole. .

  The upstream chamber 42 is a space into which the oil mixed gas that has entered the rear separator 40 from the front separator 30 through the inlet 41 first flows. That is, the upstream chamber 42 is connected to the inlet 41 at the upstream end of the upstream chamber 42. An inlet portion 41 is provided at a portion including the lowermost portion of the upstream chamber 42. Therefore, the oil separated in the upstream chamber 42 flows to the upstream separator 30 through the inlet portion 41. The upstream chamber 42 is formed by the second piece 10b and the third piece 10c.

The upstream chamber 42 is desirably provided with a channel extension rib 42a in order to lengthen the channel length of the upstream chamber 42 and to narrow the channel cross-sectional area of the upstream chamber 42. The channel extending rib 42a extends from one of the second and third pieces 10b and 10c toward the other of the second and third pieces 10b and 10c, and is fixed to the other piece by welding or the like at the tip. . FIG. 3 shows a case where the third piece 10c extends toward the second piece 10b and is welded and fixed to the second piece 10b at the tip.

The downstream chamber 43 is formed by the second piece 10b and the first piece 10a. The downstream chamber 43 is a space into which the oil mixed gas that has flowed through the upstream chamber 42 flows. That is, the downstream chamber 43 is connected to the downstream end of the upstream chamber 42 at the upstream end of the downstream chamber 43. A communication hole 44 between the upstream end of the downstream chamber 43 and the downstream end of the upstream chamber 42 is formed in the second piece 10b, and is formed at the upper end portion of the oil separator 10 or in the vicinity thereof. The communication hole 44 is provided at a position including the uppermost part of the internal space of the oil separator 10. For this reason, the oil separation effect by the labyrinth post-stage separator 40 can be enhanced.

The downstream chamber 43 is connected to the gas discharge hole 50 at the downstream end of the downstream chamber 43. Therefore, the oil mixed gas that has flowed into the rear separator 40 flows out of the oil separator 10 through the gas discharge hole 50 after the oil is separated by the rear separator 40.

The downstream chamber 43 is preferably provided with downstream-side channel extension ribs 43a in order to lengthen the channel length of the downstream chamber 43 and to narrow the channel cross-sectional area of the downstream chamber 43. The downstream-side channel extension rib 43a extends from one of the first and second pieces 10a and 10b toward the other of the first and second pieces 10a and 10b, and is fixed to the other piece by welding or the like at the tip. ing. FIG. 3 shows a case where the first piece 10a extends toward the second piece 10b and is welded and fixed to the second piece 10b at the tip.

  A small diameter hole 43 b is provided at the lowermost portion of the downstream chamber 43. The small-diameter hole 43b is formed through the second piece 10b in a direction parallel to the thickness direction D. The small diameter hole 43 b is provided in order to flow the oil separated in the downstream chamber 43 to the upstream chamber 42. The diameter of the small diameter hole 43b is relatively small, and the oil mixed gas in the upstream chamber 42 is prevented from flowing into the downstream chamber 43 through the small diameter hole 43b (shortcut). The oil that has flowed into the upstream chamber 42 from the small-diameter hole 43b flows from the upstream chamber 42 through the inlet 41 into the upstream separator 30, and then from the oil separator 10 through the first and second introduction holes 21 and 22. Discharged.

  As shown in FIG. 6, the flow passage cross-sectional area S at the downstream end of the downstream chamber 43 is the flow passage breakage of the downstream chamber 43 portion (portion other than the downstream end) on the upstream side of the downstream end. It is larger than the area S1. As shown in FIG. 3, the flow passage cross-sectional area S at the downstream end is provided upstream of the downstream end by providing the second piece 10 b with a recess 10 b 2 that is recessed in the direction away from the first piece 10 a. The flow passage cross-sectional area S1 of the downstream chamber 43 is larger. The recess 10b2 is provided at a position facing the gas discharge hole 50.

  As shown in FIG. 7, the oil separator 10 may be assembled to the engine block 100 in a posture in which the thickness direction D is inclined from the horizontal direction L by an angle θ. In this case, it is desirable that the downstream chamber 43 is located above the upstream chamber 42. Even when the rear separator 40 has a two-layer structure of the upstream chamber 42 and the downstream chamber 43 in the thickness direction D, the downstream chamber 43 can be set on the upper side of the upstream chamber 42 and the effect of dropping the weight of the oil is enhanced. Because it can. Note that θ is an angle of less than 45 degrees, for example, an angle of 10 degrees or more and less than 15 degrees.

  As shown in FIG. 3, the gas discharge hole 50 is formed at or near the upper end of the oil separator 10. The gas discharge hole 50 is provided at a position including the uppermost portion of the internal space of the oil separator 10 or in the vicinity thereof. The gas discharge hole 50 communicates with the internal passage 103 (see FIG. 2) of the engine block 100. The gas discharged from the oil separator 10 through the gas discharge hole 50 flows to the engine intake system (not shown) through the internal passage 103.

  As described above, the oil separator 10 is fixedly attached to the engine block 100 using the bolts 110. Further, the first and second introduction holes 21 and 22 communicate with first and second introduction passages 101 and 102 provided in the engine block 100, respectively. Furthermore, the gas discharge hole 50 communicates with the internal passage 103 of the engine block 100. Therefore, it is necessary to seal around (only) the first and second introduction holes 21 and 22 and the gas discharge hole 50. Therefore, as shown in FIG. 2, a seal member 120 having a diameter slightly larger than each hole is provided only around each hole. The seal member 120 is in contact with both the oil separator 10 and the engine block 100.

In order to ensure the sealing effect of each seal member 120, it is desirable that the bolts 110 that fasten the oil separator 10 to the engine block 100 are set on both sides of each seal member 120. This is because the load can be applied to each seal member 120 uniformly or almost uniformly over the entire circumference. However, since there are three seal members 120, if one seal member 120 is provided on each side (two in total), a total of six bolts are required, and the number of bolts increases.

Therefore, the embodiment of the present invention is as follows.
As shown in FIG. 1, the bolt 110 is (a) a first bolt provided on the opposite side of the first introduction hole 21 (first introduction passage 101) from the second introduction hole 22 (second introduction passage 102). 111, (b) a second bolt 112 provided on the opposite side of the first introduction hole 21 (first introduction passage 101) with respect to the second introduction hole 22 (second introduction passage 102), and (c) gas discharge A third bolt 113 provided on the opposite side of the first introduction hole 21 (first introduction passage 101) and the second introduction hole 22 (second introduction passage 102) with respect to the hole 50 (internal passage 103); (d) The gas discharge hole 50 on the opposite side of the first introduction hole 21 (first introduction passage 101) from the first bolt 111 and on the opposite side of the second introduction hole 22 (second introduction passage 102) from the second bolt 112. Provided on the opposite side of the third bolt 113 with respect to the (internal passage 103) A fourth bolt 114 consists of.

  The fourth bolt 114 is opposite to the first bolt 111 with respect to the first introduction hole 21 (first introduction passage 101) and opposite to the second bolt 112 with respect to the second introduction hole 22 (second introduction passage 102). Since it is provided on the side opposite to the third bolt 113 with respect to the gas discharge hole 50 (internal passage 103), only four bolts 110 are required for sealing the three seal members 120.

  Next, effects of the embodiment of the present invention will be described.

(A) Since the front-stage separator 30 and the rear-stage separator 40 are both made up of only resin parts, the engine block is provided with ribs that are continuous in the circumferential direction, and the engine block side faces, ribs, and resin cover Unlike the case where the enclosed space is used as a front separator (conventional), the circumferentially continuous rib provided integrally with the engine block can be eliminated. In addition, since the rib provided in an engine block can be abolished, it can suppress that (i) a rib interrupts | blocks a knock wave of an engine. Further, (ii) it is possible to reduce the weight and cost of the oil separator as compared with the case where ribs are provided. Furthermore, (iii) a sealing structure of ribs and resin oil separators that are continuous over the entire circumference is unnecessary, and as a result, only around each of the first and second introduction holes 21 and 22 and the gas discharge hole 50. Since only sealing is required, the seal length can be shortened, and the number of fastening bolts 110 for assembling the resin oil separator 10 to the engine block 100 can be reduced while ensuring sealing performance.

(B) The liquid oil introduced into the upstream oil separator 30 from the introduction hole 21 with the larger amount of introduced liquid oil collides with the inclined rib portion 31, and is lowered (guided) along the inclined rib portion 31. And it flows toward the introduction hole 22 with the smaller introduction amount of the liquid oil. Therefore, the liquid oil introduced into the oil separator 10 can be efficiently discharged out of the oil separator 10 from the introduction hole 22 having a smaller introduction amount. Further, the liquid oil introduced from the introduction hole 21 having the larger amount of liquid oil flows back to the introduction hole 21 having the larger introduction amount, and the introduction hole 21 having the larger introduction amount is clogged. Can be suppressed. In the embodiment of the present invention, the case where the introduction hole with the larger liquid oil introduction amount is the first introduction hole 21 has been described, but the introduction hole with the larger liquid oil introduction amount is the second introduction hole 22. It may be.

(C) Since the rear separator 40 has a two-layer structure of the upstream chamber 42 and the downstream chamber 43, the flow path length of the rear separator 40 can be increased, and the oil separation performance by the rear separator 40 can be enhanced. Although the cross-sectional area of the flow path is narrower by using the two-layer structure as compared with the case of the one-layer structure, the oil after the liquid oil is separated by the first separator 30 instead of the first separator 30 through which a large amount of liquid oil flows. Since it is the post-stage separator 40 through which the mist flows, it is possible to suppress the clogging of the flow path with oil even if the cross-sectional area of the flow path is narrowed with a two-layer structure.

(D) Since the flow passage cross-sectional area S at the downstream end of the downstream chamber 43 is larger than the flow passage cross-sectional area S1 of the downstream chamber 43 portion upstream of the downstream end, the downstream chamber 43 The flow rate of the gas flowing through the gas discharge hole 50 through the downstream end of the downstream chamber 43 can be reduced. Therefore, it is possible to suppress the oil separated by the oil separator 10 from being taken away by the gas discharge hole 50.

(E) Since the oil separator 10 is assembled to the engine block 100 with the thickness direction D inclined from the horizontal direction, and the downstream chamber 43 is located above the upstream chamber 42, the downstream chamber 43 and the upstream chamber 42 are provided. In addition, the labyrinth post-stage separator 40 can obtain an oil separation effect due to the gravitational drop effect of the oil itself.

(F) Since the fourth bolts 114 are provided, the number of bolts 110 required for sealing the three seal members 120 is four, and the number of bolts can be reduced.

(G) Since both the front separator 30 and the rear separator 40 are formed by the first, second, and third pieces 10a, 10b, and 10c, only the rear separator 40 is separately manufactured, and the first, second, and second pieces are separately manufactured. Unlike the case of assembling to any of the three pieces 10a, 10b, and 10c, the space required for the assembly can be reduced, which is advantageous in terms of the space for mounting the oil separator 10.

DESCRIPTION OF SYMBOLS 10 Oil separator 10a 1st piece 10b 2nd piece 10b1, 10b2 Recessed part 10c 3rd piece 21 1st introduction hole 22 2nd introduction hole 30 Previous stage separator 31 Inclined rib 40 Later stage separator 41 Inlet part 42 Upstream chamber 42a Flow path extension rib 43 Downstream chamber 43a Downstream channel extension rib 43b Small diameter hole 44 Communication hole 50 Gas discharge hole 100 Engine block 101 First introduction passage 102 Second introduction passage 103 Internal passage 110 Bolt 111 First bolt 112 Second bolt 113 Third bolt 114 Fourth bolt 120 Seal member D Thickness direction S Channel cross-sectional area S1 at the downstream end of the downstream chamber Channel cross-sectional area at a portion other than the downstream end of the downstream chamber

Claims (5)

A resin oil separator disposed outside the engine block and assembled to the side of the engine block,
A first introduction hole and a second introduction hole for introducing the oil mixed gas in the engine block into the oil separator;
A pre-stage separator that mainly collects liquid oil from the oil mixed gas introduced from the first and second introduction holes;
A downstream separator that is disposed downstream from the upstream separator and mainly collects oil mist that flows without being collected by the upstream separator;
A gas discharge hole that is formed on the downstream side of the rear separator and discharges the gas from which the oil has been separated by the front separator and the rear separator to the outside of the oil separator;
Have
An oil separator in which the front-stage separator and the rear-stage separator are both made up of only resin parts.   The front separator is disposed above and below the introduction hole of the first and second introduction holes where the amount of liquid oil introduced is larger, and below the introduction hole of the first and second introduction holes. The oil separator according to claim 1, further comprising an inclined rib portion extending in a direction approaching the introduction hole having a smaller amount.   The latter-stage separator is a labyrinth type separator, and is connected to the upstream chamber on one side in the thickness direction of the oil separator and the downstream end on the other side in the thickness direction of the oil separator and connected to the downstream end of the upstream chamber. The oil separator according to claim 1, wherein the oil separator has a two-layer structure including a downstream chamber connected to the gas discharge hole.   4. The oil separator according to claim 3, wherein a flow passage cross-sectional area at a downstream end of the downstream chamber is larger than a flow passage cross-sectional area of a downstream chamber portion located upstream from the downstream end.   The oil separator according to claim 3 or 4, wherein the oil separator is assembled to the engine block in a posture in which the thickness direction is inclined from a horizontal direction, and the downstream chamber is located above the upstream chamber.

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