CN203640806U

CN203640806U - Oil separator

Info

Publication number: CN203640806U
Application number: CN201320851266.8U
Authority: CN
Inventors: 藤川季树
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2013-12-20
Filing date: 2013-12-20
Publication date: 2014-06-11
Anticipated expiration: 2023-12-20

Abstract

The utility model provides an oil separator. The oil separator (1) comprises an outer shell, an oil separation part, and a leak hole (9), wherein the outer shell is fixed on the side face of a cylinder body (2) in a state that a hollow chamber (S) is formed between the outer shell and the cylinder body (2); the oil separation part is arranged inside the hollow chamber (S); and the leak hole (9) is communicated with the hollow chamber (S) and used for discharging oil separated by the oil separation part. A backflow restriction part (10) preventing at least a part of oil mist (16) from flowing from the leak hole (9) back to the hollow chamber (S) is formed nearby the leak hole (9) of the inner wall of the outer shell. Based on the structure, as the backflow restriction part (10) can prevent at least a part of the oil mist from flowing from the leak hole (9) back to the hollow chamber (S), the oil mist flowing back into the hollow chamber (S) can be reduced.

Description

Oil separating device

Technical field

The utility model relates to and a kind ofly from the blow-by gas body that contains mist of oil, separates fuel-displaced oil separating device.

Background technique

In prior art, exist a kind of blow-by gas body that makes to leak into crankcase from engine chamber flow back into gas-entered passageway, to carry out the PCV(Positive Crankcase Ventilation of crankcase scavenging, positive crankcase ventilation (PCV)) device.While passing through from crankcase due to blow-by gas body, sneaked into and become vaporific machine oil (hereinafter referred to as mist of oil), if make blow-by gas body directly flow back in gas-entered passageway and burn, oil consumption increases.Therefore, in PCV device, be mostly provided with the machine oil in blow-by gas body (being designated hereinafter simply as oil) is isolated and by isolated oil send the oil separating device of crankcase back to.

As oil separating device, for example, there is a kind of device that possesses shell, oil separation part and small opening etc.Wherein, shell with and cylinder block between form empty chamber state be fixed on the side of cylinder block, in the indoor oil separation part of from blow-by gas body, oil being separated that is provided with of above-mentioned sky, small opening is communicated with the oily passage that leads to crankcase with above-mentioned empty chamber.Employing has the oil separating device of this structure, and in the time of the indoor inflow blow-by gas of above-mentioned sky body, oil separation part is isolated oil from blow-by gas body, and the oil being separated is discharged and turns back to crankcase via oily passage from small opening.

But there is following problem in the oil separating device with said structure.That is, flowing back to the indoor mist of oil of above-mentioned sky from small opening can disperse this sky is indoor, and flow back in gas-entered passageway together with blow-by gas body, and oil consumption is increased.In order to address this problem, can consider to arrange safety check in small opening, or adopt and can not suck the oil passage structure of mist of oil, still, these ways can cause again valve obturation, structure such problem that complicates.

Model utility content

In order to solve the problems of the technologies described above, the purpose of this utility model is, provides a kind of can minimizing to flow back to the indoor mist of oil of sky that is provided with oil separation part, and oil separating device simple in structure.

As the technological scheme solving the problems of the technologies described above, the utility model provides a kind of oil separating device.This oil separating device comprises, with and cylinder block between form empty chamber state be fixed on the shell of the side of this cylinder block, be communicated with in the oil separation part of the indoor setting of described sky and with described empty chamber and by described oil separation part the isolated oil small opening of discharging, it is characterized in that: near of the described small opening of the inwall of described shell, be formed with the refluence limiting unit of at least a portion that stops the mist of oil from described small opening to the indoor refluence of described sky.

The advantage with the oil separating device of the present utility model of said structure is, near small opening due to wall in the enclosure, be formed with the refluence limiting unit of at least a portion that stops the mist of oil from small opening to the indoor refluence of sky, so, at least a portion of mist of oil from from small opening to the indoor refluence of sky limiting unit that flow backwards stops, flows back to empty indoor mist of oil thereby can reduce.Its result, can reduce oil consumption.And, do not need to append the new parts such as safety check, only need on the inwall of shell, form refluence limiting unit, thereby can obtain above-mentioned effect with simple structure.

Brief description of the drawings

Fig. 1 is the figure that represents a part for the cylinder block sidewall portion of the oil separating device that is provided with mode of execution of the present utility model.

Fig. 2 is the figure of the shell seen from cylinder block side.

Fig. 3 is the sectional view on the A-A line in Fig. 1.

Fig. 4 is the enlarged view of the B portion in Fig. 3.

Embodiment

Below, with reference to accompanying drawing, embodiment of the present utility model is described.But the utility model is not by the record in this mode of execution is limited.

Fig. 1 represents a part for the side wall portion 3 of the cylinder block 2 of the oil separating device 1 that is provided with mode of execution of the present utility model.Cylinder block 2 is constituent elements that are assembled in the motor on automobile etc.The upside of cylinder block 2 is provided with cylinder head (not shown) and cylinder head cover (not shown).The downside of cylinder block 2 is provided with oil sump (not shown).

In such motor, in compression stroke and expansion stroke, in the space (also claiming below crankcase) that gas surrounds to bottom and the oil sump of cylinder block 2 from the clearance leakage between the cylinder (not shown) of cylinder block 2 and the piston ring (not shown) of piston.Such gas comprises combustion gas that spill in the mixed gas that spills in compression stroke and expansion stroke etc., is called as blow-by gas body (being designated as below blow-by gas body G).Blow-by gas is known from experience makes engine motor oil (hereinafter to be referred as oil, and being designated as oily O) deteriorated, thereby likely becomes the reason that causes that engine interior gets rusty.

Therefore, in motor, be provided with, by making blow-by gas body return to gas-entered passageway (not shown) and burning again, and realize the PCV device of the ventilation in crankcase in firing chamber (not shown).PCV device has the blow-by gas body passage (aftermentioned) that crankcase is communicated with the downstream side of the throttle valve (not shown) of gas-entered passageway.In PCV device, the negative pressure that the downstream side of throttle valve occurs acts on crankcase via blow-by gas body passage, thereby the blow-by gas body G spilling from engine chamber is inhaled in crankcase.Then,, due to air-intake negative-pressure, the blow-by gas body G flowing in crankcase is inhaled into gas-entered passageway via blow-by gas body passage from crankcase, and burns in engine chamber again.

But when blow-by gas body G passes through from crankcase etc., oily O becomes vaporific and is blended in blow-by gas body G.If make this contain vaporific oily O(mist of oil) blow-by gas body G burn again, oil consumption can increase.Therefore, in the present embodiment, be provided with oil separating device 1, by from blow-by gas body G, oily O being separated, and isolated institute oily O reclaimed, reduce oil consumption.

As shown in Figure 1, oil separating device 1 is arranged on outer wall (side) 3a of side wall portion 3 of cylinder block 2.This oil separating device 1 comprises, and between cylinder block 2, form the shell 7, oil separation part 8 of empty chamber S and for small opening 9(that oil is discharged with reference to Fig. 3).

On the outer wall 3a of the side wall portion 3 of cylinder block 2, form ring-type convex strip portions 11 with side wall portion 3.The ring-type engagement portion 17 of the shell 7 shown in Fig. 2 is fastened on this ring-type convex strip portions 11 by the secure components such as bolt 12.So, by ring-type convex strip portions 11 is fixedly connected with ring-type engagement portion 17, shell 7 is fixed on to the side wall portion 3(outer wall 3a of cylinder block 2) upper, formed an empty chamber S who is surrounded by outer wall 3a, ring-type convex strip portions 11 and shell 7 in the side of cylinder block 2.In addition, sealed between ring-type convex strip portions 11 and ring-type engagement portion 17, so that blow-by gas body G cannot leak into outside.

In addition, as shown in Figure 1, the part of the upside of empty chamber S is provided with for separating fuel-displaced O(mist of oil from blow-by gas body G) oil separation part 8.At the position of more leaning on upstream side than this oil separation part 8, be formed with a pair of gas channel 5, the 6(blow-by gas body passage that extend along the vertical direction).The underpart of each gas channel 5,6 is connected with crankcase.Meanwhile, than the more position of downstream of oil separation part 8, be formed with a downstream gas path (not shown).This downstream gas path is connected with the knock out drum (not shown) of the inlet stream downstream side configuration of the throttle valve of gas-entered passageway.Thus, in oil separation part 8, the blow-by gas body G after mist of oil is separated flow back in gas-entered passageway via downstream gas path.

Fig. 3 is the sectional view on the A-A line in Fig. 1, and Fig. 4 is the enlarged view of the B portion in Fig. 3.As shown in Figure 3, in the side wall portion 3 of cylinder block 2, formed for making oil turn back to the oily passage 13 of crankcase from cylinder head by casting.This oil passage 13 extends to the crankshaft neck of the bent axle (not shown) arranging in crankcase always from the end face of cylinder block 2.Thus, the oily O discharging from cylinder head, as arrow 14 indications Fig. 3, turns back in crankcase via oily passage 13 and crankshaft neck.

Small opening 9 is in the internal face upper shed of empty chamber S, and with empty chamber S internal communication.More specifically, the state of small opening 9 so that the bottom that is positioned at the empty chamber S in the middle of two gas channels 5,6 is communicated with oily passage 13, in the outer wall 3a upper shed of the side wall portion 3 of cylinder block 2.Thus, savings, is discharged to oily passage 13 from empty chamber S via small opening 9 as arrow 15 indications in Fig. 3 at the oily O of the bottom of empty chamber S.So, a part (than small opening 9 part of side more on the lower) for oily passage 13 is also used as the drainback passage that makes oil separation part 8 isolated oily O from blow-by gas body G return to crankcase.

Adopt said structure, the mist of oil containing blow-by gas body G in gas channel 5,6 is directed to sky chamber S rises while contacts and be liquefied with internal face of oil separation part 8 etc. in empty chamber S, oily O after liquefaction isolates from blow-by gas body G,, because deadweight drips to or flows in oil separation part 8, and savings is in the bottom of empty chamber S, thereafter, be discharged to oily passage 13 from empty chamber S by small opening 9, then turn back to crankcase via crankshaft neck.

But, just by with small opening 9, empty chamber S is communicated with oily passage 13 by isolated oily O discharge from oil separating device 1, there will be following problem., as described above, in PCV device, the negative pressure that the downstream side of throttle valve occurs acts on crankcase via blow-by gas body passage.Therefore, the gas in crankcase is likely via oily passage 13(drainback passage) and flow back in the S of sky chamber from small opening 9, the mist of oil of sneaking in this gas is inhaled into sky chamber S from small opening 9, and disperses in empty chamber S.Like this, the mist of oil of refluence disperses in empty chamber S, and can flow back in gas-entered passageway and be burnt again together with blow-by gas body G, so, although be provided with oil separating device 1, can not effectively reduce oil consumption.

In order addressing this problem, can consider, at small opening 9, safety check is set, or adopt the oil passage structure that can not suck mist of oil, but these ways to there will be again valve obturation, structure to become complicated such problem.

To this, in the present embodiment, as shown in Figure 3 and Figure 4, near of the small opening 9 of the inwall of shell 7, form and stoped the refluence limiting unit 10 that flows back at least a portion of the mist of oil the S of sky chamber from small opening 9.More specifically, conventionally, the ring-type engagement portion 17 on shell 7 is formed with ring-type convex strip portions 11 shapes roughly the same, but in present embodiment, as shown in Figure 2, make the part of the close small opening 9 of ring-type engagement portion 17 expand to the inside and form refluence limiting unit 10.This refluence limiting unit 10 is formed, and top (the D portion in Fig. 4), higher than the C portion of cylinder block 2, sidepiece E faces toward the entrance of small opening 9, thereby can stop a part of mist of oil entering from the entrance of small opening 9, and don't affects the discharge of oily O.

So, by forming such refluence limiting unit 10, flow back to the mist of oil of sky chamber S from small opening 9 as arrow 16 indications of Fig. 4, before dispersing in the S of sky chamber, just blocked by refluence limiting unit 10 and be liquefied.Be discharged to oily passage 13 from empty chamber S via small opening 9 by the oily O after liquefying like this, then turn back to crankcase via this oil passage 13.Therefore, adopt the structure of present embodiment, can make the amount that sucks the mist of oil in empty chamber S from small opening 9 reduce, thereby can reduce oil consumption.And, do not need to set up the new parts of safety check etc., the limiting unit 10 that only a part for shell 7 need be formed as flowing backwards, thereby, can obtain above-mentioned effect with simple structure.

In addition, in present embodiment, make oily passage 13 extend to the structure of crankshaft neck owing to having adopted, so producing along with the rotation of crank pin and connecting rod can be isolated between the axial part of song of mist of oil and the underpart of oily passage 13 always.Thereby, can more effectively prevent the refluence of mist of oil.

Claims

1. an oil separating device, comprise with and cylinder block between form empty chamber state be fixed on the shell of the side of this cylinder block, be communicated with in the oil separation part of the indoor setting of described sky and with described empty chamber and by described oil separation part the isolated oil small opening of discharging, it is characterized in that:

In near of the described small opening of the inwall of described shell, be formed with the refluence limiting unit of at least a portion that stops the mist of oil from described small opening to the indoor refluence of described sky.