CN105604646A

CN105604646A - Internal combustion engine

Info

Publication number: CN105604646A
Application number: CN201510751952.1A
Authority: CN
Inventors: 镰仓正典
Original assignee: Suzuki Motor Corp
Current assignee: Suzuki Motor Corp
Priority date: 2014-11-18
Filing date: 2015-11-06
Publication date: 2016-05-25
Anticipated expiration: 2035-11-06
Also published as: DE102015222165B4; DE102015222165A1; JP6380035B2; JP2016098645A; CN105604646B

Abstract

Provided is an internal combustion engine which can enlarge the capacity of an oil separation chamber, and meanwhile can configure an auxiliary engine and cylinder block in small size. An oil separation chamber projected on the sidewall (2B) of a cylinder block (2) is provided with a linear oil separation chamber (42) extending roughly parallel with the projecting direction of a starting motor (52); one part of the starting motor (52) projects into the space under the linear oil separation chamber (42) from a flange portion (51). Accordingly, the internal combustion engine can enlarge the projecting amount of the oil separation chamber (17) relative to the sidewall (2B) of the cylinder block (2), and configures the starting motor (52) to be close to the sidewall (2B) of the cylinder block (2).

Description

Internal combustion engine

Technical field

The present invention relates to internal combustion engine, particularly, relate at the sidewall of cylinder block oil separation is setThe internal combustion engine of chamber and subsidiary engine.

Background technology

In the internal combustion engine carrying at vehicles such as automobiles, along with the running of internal combustion engine, gaseous mixtureBody and combustion gas cognition escape to crank chamber between piston and cylinder inner wall, produce what is called and alterGas leakage body, therefore, is sent into combustion again by making blow-by gas be back to gas handling systemBurn chamber, again make its burning, prevent because blow-by gas causes oil deteriorated.

As the existing internal combustion engine that possesses oil separation chamber, the known sidewall setting in cylinder blockForm the breather chamber of oil separation chamber, internal combustion breather chamber being communicated with crank chamber by accessMachine (for example,, with reference to patent documentation 1).

In addition, in the internal combustion engine of recording at patent documentation 1, in the side of breather chamber to connectThe mode of the sidewall of nearly cylinder block is provided with the starting device as subsidiary engine.

Prior art document

Patent documentation

Patent documentation 1: specially permit No. 3715214 communique

Summary of the invention

The problem that invention will solve

But, in so existing internal combustion engine, because the side in breather chamber is to approachThe mode of the sidewall of cylinder block is provided with starting device, and therefore, breather chamber can be by starting deviceShelter from, cannot make breather chamber outstanding significantly to foreign side from the sidewall of cylinder block.

Therefore, likely cannot make the capacity of breather chamber become large, cannot make oily separating propertyImprove. To this, for making the capacity of breather chamber become large, can consider in the inside of cylinder block to beThe inner side of the sidewall of cylinder block forms the larger breather chamber of capacity.

But, in the time of the larger breather chamber of the capacity that forms in the inside of cylinder block, cylinder block meetingMaximize, the engine that possesses cylinder block and starting device can maximize on the whole.

The present invention is conceived to above-mentioned such problem and completes, and its object is, providesCan either make the capacity of oil separation chamber become subsidiary engine and cylinder block can be arranged jointly greatly againLess internal combustion engine.

For the scheme of dealing with problems

The present invention is internal combustion engine, possesses: cylinder block, and it has multiple cylinders; Oil separation chamber,It is formed as outstanding and for separating of the oil blow-by gas from the sidewall of above-mentioned cylinder block; MethodOrchid portion, it is arranged on the end of the above-mentioned cylinder block of above-mentioned bank of cylinder direction; And subsidiary engine,It is assemblied in above-mentioned flange portion and is outstanding from above-mentioned flange portion along above-mentioned sidewall, wherein, onState oil separation chamber and there is straight line oil separation chamber, this straight line oil separation chamber and above-mentioned subsidiary engine outstandingDirection is parallel, and at least a portion of above-mentioned subsidiary engine is projected into above-mentioned straight line oil from above-mentioned flange portionThe space of the below of separation chamber.

Invention effect

According to the present invention, the oil separation chamber forming highlightedly from the sidewall of cylinder block has straight lineOil separation chamber, straight line oil separation chamber is parallel with the projected direction of subsidiary engine, at least one portion of subsidiary engineDivide the space that is projected into the below of straight line oil separation chamber from flange portion.

Thus, can make oil separation chamber large with respect to the outstanding quantitative change of the sidewall of cylinder block, andAnd subsidiary engine can be arranged to such an extent that approach the sidewall of cylinder block. Therefore, can either make oil separation chamberCapacity become improve greatly oily separating property, subsidiary engine and cylinder block can be arranged jointly againMust be less, can realize the miniaturization of internal combustion engine.

Brief description of the drawings

Fig. 1 is the figure that an embodiment of internal combustion engine of the present invention is shown, is to possess oil to separateThe summary pie graph of the internal combustion engine of chamber.

Fig. 2 is the figure that an embodiment of internal combustion engine of the present invention is shown, is to possess oil to separateThe longitudinal section of the internal combustion engine of chamber.

Fig. 3 is the figure that an embodiment of internal combustion engine of the present invention is shown, is to have taken off cylinderThe stereogram of the internal combustion engine that possesses oil separation chamber of the state of housing and chain cover.

Fig. 4 is the figure that an embodiment of internal combustion engine of the present invention is shown, is the side of internal combustion engineView.

Fig. 5 is the figure that an embodiment of internal combustion engine of the present invention is shown, is to have taken off air inletThe side view of the internal combustion engine of the state of manifold.

Fig. 6 is the figure that an embodiment of internal combustion engine of the present invention is shown, is the VI-VI of Fig. 5Direction to looking sectional view.

Fig. 7 is the figure that an embodiment of internal combustion engine of the present invention is shown, is to see from oblique belowSee the major part stereogram of the internal combustion engine of the state of oil separation chamber.

Description of reference numerals

1... engine (internal combustion engine), 2... cylinder block, 2a... mono-end be (bank of cylinder directionThe end of cylinder block), 2b... the other end (is positioned at the cylinder block of opposition side across sidewallEnd), 6... crank axle, 7... admission cam shaft (camshaft), 8... exhaust cam shaft is (protrudingWheel shaft), 11... timing chain, 17... oil separation chamber, 20... access (the 2nd access), 21...Chain cover, 22... chain receiving room, 23... access (the 1st access), 24... crank chamber, 27...Cylinder, 40... case portion (oil separation chamber), 41... cover member (oil separation chamber), 42... oil contentFrom chamber (straight line oil separation chamber), 42c... mono-end be (bearing of trend of straight line oil separation chamberEnd) 43... oil separation chamber (vertical oil separation chamber), 51... flange portion, 52... starting is electronicMachine (subsidiary engine), 53... rib, 54... recess

Detailed description of the invention

The embodiment of internal combustion engine involved in the present invention is described with accompanying drawing below.

Fig. 1～Fig. 7 is the figure that the internal combustion engine of an embodiment involved in the present invention is shown.

First, formation is described. In addition, in Fig. 1～Fig. 7, left-right and front-back direction indication fromThe left-right and front-back direction of the vehicle that driver's seat is watched.

In Fig. 1～Fig. 5, engine 1 tool of the internal combustion engine carrying as vehicles such as automobilesStandby: cylinder block 2; Cylinder head 3, it is arranged on the top of cylinder block 2; Valve mechanism cover 4, itsBe arranged on the top of cylinder head 3; And oil sump 5, it is arranged on the bottom of cylinder block 2.

In Fig. 1, in cylinder block 2, being accommodated with moves up and down is accommodated in cylinder 27 freelyIn piston 28, moving up and down of piston 28 is converted to the crank axle 6 that rotatablely moves etc.,Bottom in cylinder block 2 is provided with crank box 2A integratedly, and crank box 2A supports crank axle 6It is rotated freely. In addition, between crank box 2A and oil sump 5, be formed with crank chamber 24.At this, the cylinder 27 of present embodiment forms cylinder of the present invention.

In Fig. 1, Fig. 3, cylinder head 3 possesses: admission cam shaft 7, it is along cylinder 27Orientation extend, possess admission cam 7a; And exhaust cam shaft 8, itself and air inletCamshaft 7 configured in parallel and extending along the orientation of cylinder 27, possess exhaust cam 8a.At this, admission cam shaft 7 and the exhaust cam shaft 8 of present embodiment form cam of the present inventionAxle.

In the engine 1 of present embodiment, storage admission cam shaft 7 and exhaust cam shaft 8Cylinder head 3 and valve mechanism cover 4 between space form cavaera 13. In addition, admission camAxle 7 and exhaust cam shaft 8 are supported in cylinder head 3 (ginseng freely by multiple cam nut 3A rotationsAccording to Fig. 3).

In Fig. 1, in cylinder head 3, be formed with air inlet 29 and exhaust outlet 30, air inlet 29With exhaust outlet 30 by the rotation along with admission cam 7a and exhaust cam 8a driven enterAir valve 31 and air bleeding valve 32 open and close.

The arm 34 that is equipped with inlet manifold 33 in cylinder head 3, inlet manifold 33 is connected withAir filter 35. Air filter 35 purifies the air amount Ai being taken into from outside.

Air amount Ai after being purified by air filter 35 is from the arm 34 of inlet manifold 33Be assigned with and suck each cylinder 27 via each air inlet 29.

Be provided with choke valve 34A at the upstream side of inlet manifold 33, this choke valve 34A adjustsSuck the air capacity of cylinder 27.

In Fig. 3, be provided with admission cam sprocket wheel 9 in the end of admission cam shaft 7, enteringOn gas cam sprocket wheel 9, be wound with timing chain 11. End at exhaust cam shaft 8 is provided with exhaustCam sprocket wheel 10 is wound with timing chain 11 on this exhaust cam sprocket wheel 10.

Be provided with crank and chain-wheel 12 in the end of crank axle 6, on crank and chain-wheel 12, be wound withTiming chain 11. Thus, the rotation of crank axle 6 is transmitted via timing chain 11 from crank and chain-wheel 12Give air inlet cam chain wheel 9 and exhaust cam sprocket wheel 10, thus make admission cam shaft 7 and exhaust protrudingWheel shaft 8 rotates.

In the time of admission cam 7a and exhaust cam 8a rotation, intake valve 31 and air bleeding valve 32 are respectivelyOpen and close air inlet 29 and exhaust outlet 30 (with reference to Fig. 1), thus, will be formed on the upper of cylinder 27The combustion chamber 14 (with reference to Fig. 1) of portion disconnects with air inlet 29 and exhaust outlet 30 connected sums. ThisSample, utilize timing chain 11 to make intake valve 31 and air bleeding valve 32 according to the rotation of crank axle 6 andAction.

In Fig. 2, establish in the end of cylinder block 2 and cylinder head 3 (front face side of engine 1)Be equipped with chain cover 21. Chain cover 21 covers timing chain 11, and between cylinder block 2 and chain cover 21Be formed with chain receiving room 22, chain receiving room 22 is communicated with crank chamber 24.

In Fig. 1～Fig. 7, be formed with oil separation chamber 17, oil content at the sidewall 2B of cylinder block 2Be formed at sidewall 2B by the sidewall 2B with from cylinder block 2 to the outstanding mode of foreign side from chamber 17Case portion 40 and the cover member 41 that is assemblied in the openend of case portion 40 be formed as crank shape.

In Fig. 3, Fig. 4, Fig. 5, Fig. 7, be bank of cylinder direction in the orientation of cylinder 27An end 2a of cylinder block 2, in the fore-and-aft direction rearward end of the engine 1 of cylinder block 2Be provided with flange portion 51. In flange portion 51, be equipped with starting motor 52 (with reference to Fig. 4,Fig. 5, Fig. 6), starting motor 52 from flange portion 51 along sidewall 2B to the prolonging of crank axle 6Stretch the direction that direction (fore-and-aft direction of engine 1) is identical outstanding. At this, crank axle 6Bearing of trend refer to the bearing of trend of the rotary middle spindle of crank axle 6.

In addition, the chain cover 21 of present embodiment is arranged on across sidewall 2B and is positioned at the method for being provided withA contrary side (the fore-and-aft direction front end of engine 1 of one end 2a of the cylinder block 2 of orchid portion 51Portion) the other end 2b (with reference to Fig. 2～Fig. 5, Fig. 7) of cylinder block 2.

At this, an end 2a of the sidewall 2B of present embodiment forms bank of cylinder of the present inventionThe end of the cylinder block of direction, starting motor 52 forms subsidiary engine of the present invention. In addition, gasThe other end 2b of cylinder body 2 forms the cylinder block that is positioned at opposition side across sidewall of the present inventionEnd.

In Fig. 2, oil separation chamber 17 has: the oil separation chamber 42 of linearity, itself and startingThe projected direction of motor 52 is parallel; Oil separation chamber 43, it is formed on prolonging of oil separation chamber 42Stretch an end 42c of direction, in the direction vertical with the projected direction of starting motor 52Extend towards below; And oil separation chamber 44, it is formed on the bearing of trend of oil separation chamber 42The other end 42d, in the direction vertical with the projected direction of starting motor 52 towards aboveExtend.

And, these oil separation chambers 42,43,44 comprise by case portion 40, cover member 41 andThe space that case portion 40 and cover member 41 surround.

At this, the oil separation chamber 42 of present embodiment forms straight line oil separation chamber of the present invention,Oil separation chamber 43 forms vertical oil separation chamber of the present invention. In addition, the extension of oil separation chamber 42One end 42c of direction forms the end of the bearing of trend of straight line oil separation chamber of the present invention.

In oil separation chamber 43, be provided with partition wall 43A. Partition wall 43A from sidewall 2B towardsCover member 41 is outstanding, is formed with gap 45 at the front end of projected direction with covering between member 41(with reference to Fig. 6).

In Fig. 2, in oil separation chamber 42, be provided with partition wall 42A, 42B. Partition wall42A, 42B are outstanding towards cover member 41 from sidewall 2B, outstanding at partition wall 42A, 42BBetween the front end of direction and cover member 41, be formed with gap.

In oil separation chamber 43, be formed with introducing port 43a, introducing port 43a is via being formed at cylinderThe access 23 of body 2 is communicated with chain receiving room 22. Thus, flow to chain storage from crank chamber 24The blow-by gas of chamber 22 is imported into oil separation chamber 43 from access 23 by introducing port 43a.

At this, as shown in arrow B in Fig. 1, blow-by gas B is the running along with engine 1From escaping to mist and the burning of crank chamber 24 between piston 28 and the inwall of cylinder 27Gas.

In Fig. 2, be formed with introducing port 43b in the bottom of oil separation chamber 43, introducing port 43bBe communicated with crank chamber 24 via the access 20 that is formed at cylinder block 2. Thus, in crank chamberBlow-by gas B mobile in 24 is directly imported into oil content from access 20 by introducing port 43bFrom chamber 43. In addition, introducing port 43a, 43b are formed on blow-by gas compared with partition wall 43AThe upstream side of flow direction.

At this, the access 23 of present embodiment forms the 1st access of the present invention, is communicated withRoad 20 forms the 2nd access.

In Fig. 6, in cover member 41, be formed with leadout hole 41A. At Fig. 1, Fig. 5～Fig. 7In, on cover member 41, being equipped with blow-by gas delivery line 36, oil separation chamber 44 is from leadout hole41A is communicated with inlet manifold 33 by blow-by gas delivery line 36. Be imported into oil separation chamber 44After blow-by gas pass through from blow-by gas delivery line 36 due to the air-intake negative-pressure of engine 1Inlet manifold 33 is sucked into arm 34.

At this, in the oil separation chamber 17 of present embodiment, by access 20,23 from songHandle chamber 24 and chain receiving room 22 are imported into blow-by gas and the partition wall 43A after oil separation chamber 43Collision, thus oil is separated from blow-by gas, is imported into oil separation chamber 42 by gap 45.

The blow-by gas and partition wall 42A, the 42B that are imported into after oil separation chamber 42 collide and oilAfter separated, be imported into oil separation chamber 44, be imported into the blow-by gas quilt after oil separation chamber 44Blow-by gas delivery line 36 aspirates.

Be drawn into blow-by gas after inlet manifold 33 be imported into engine 1 combustion chamber 14 andTogether with mist in the interior burning in combustion chamber 14.

Between oil separation chamber 44 and blow-by gas delivery line 36, be provided with the 37 (references of PCV valveFig. 1), PCV valve 37 is adjusted the blowby gas that flows to blow-by gas delivery line 36 from oil separation chamber 44Body flow.

In Fig. 1, valve mechanism cover 4 and the air filter 35 by upstream side than choke valve 34AConnected by live gas ingress pipe 38, live gas ingress pipe 38 is by one of air amount AiDivide is that live gas An imports cavaera 13.

In cylinder block 2 and cylinder head 3, be formed with live gas and import path 39, live gasImport path 39 and be communicated with cavaera 13 and crank chamber 24. Due to air-intake negative-pressure from live gasThe live gas An that ingress pipe 38 is imported into after cavaera 13 passes through to be communicated with from chain receiving room 22Road 23 and introducing port 43a are imported into oil separation chamber 43.

In addition, the live gas An from live gas ingress pipe 38 is imported into cavaera 13Importing path 39 from live gas is led by crank chamber 24, access 20 and introducing port 43bEnter oil separation chamber 43. The blow-by gas that is imported into oil separation chamber 42 is inhaled by oil separation chamber 42Enter after oil separation chamber 44, be imported into cylinder from blow-by gas delivery line 36 via inlet manifold 3327. Thus, comprise cavaera 13, chain receiving room 22 and crank chamber 24 at interior engine 1Inner utilization live gas An take a breath.

In Fig. 3～Fig. 7, be positioned at oil separation chamber 17 below the sidewall 2B of cylinder block 2On be formed with rib 53, rib 53 is the axis side of crank axle 6 from sidewall 2B along bank of cylinder directionTo extension. At this, what the rib 53 of present embodiment increased as the intensity that makes cylinder block 2 addsStrong component performance function.

In Fig. 3, Fig. 7, at the sidewall 2B taking cylinder block 2 as bottom surface, at gasIn cylinder body 2, form by flange portion 51, rib 53, oil separation chamber 42,43 and sidewall 2B and wrappedThe recess 54 enclosing.

In Fig. 4～Fig. 6, starting motor 52 is projected into oil separation chamber 42 from flange portion 51The space of below, particularly, the starting motor 52 of present embodiment is from flange portion 51Be projected into recess 54 (with reference to Fig. 4, Fig. 5).

In addition, the starting motor 52 of present embodiment be except the base portion of flange portion 51 sides withThe position of outer starting motor 52 is projected into recess 54 from flange portion 51, but is not limited to this,Also can be that whole starting motor 52 is projected into recess 54 from flange portion 51.

In the engine 1 of present embodiment, as long as at least a portion of starting motor 52In space below oil separation chamber 42, be projected into recess 54 from flange portion 51.

In Fig. 3, in cylinder block 2, be provided with atomizer in the mode that is positioned at chain receiving room 2255, atomizer 55 sprays for lubricated oil to timing chain 11.

In Fig. 3～Fig. 5, on the sidewall 2B of cylinder block 2, be provided with detonation sensor 56,Detonation sensor 56 detects the vibration that results from cylinder block 2 due to the pinking of engine 1.

Oil separation chamber 42 is arranged on below and oil separation chamber 44 compared with detonation sensor 56On the fore-and-aft direction of engine 1 with the overlapping mode of detonation sensor 56 from oil separation chamberThe other end 42d of 42 extends upward. , the oil separation chamber 17 of present embodiment is to keep awayThe mode of opening detonation sensor 56 is formed at the sidewall 2B of cylinder block 2.

Therefore, as shown in Figure 5, can guarantee for leaning on engine 1 than detonation sensor 56Fore-and-aft direction rear the space of the end of blow-by gas delivery line 36 is set, by blow-by gasDelivery line 36 is connected to the cover member 41 of oil separation chamber 44.

Then, illustration.

In chain receiving room 22, just undertaken by spraying oil from atomizer 55 to timing chain 11Time chain 11 lubricated. Therefore, take a breath if chain receiving room 22 is insufficient, be imported into chainThe NOx (nitrogen oxide) comprising in the blow-by gas of receiving room 22 can occur anti-with moistureAnswer and generate nitric acid, oil meeting aggegation due to this nitric acid, produces greasy filth.

This greasy filth is tarry matters, if greasy filth is sneaked in the oil of lubricating engine 1, canCause the deteriorated of oil, cause that the action of oil hydraulic system is bad, crank axle 6, admission cam shaft 7With the insufficient lubrication of exhaust cam shaft 8 sliding components such as grade, the resistance to sliding of engine 1 is increasedGreatly, the fuel efficiency of engine 1 worsens.

As shown in Figure 2, in the engine 1 of present embodiment, cylinder block 2 has the oil of connectionThe access 23 of separation chamber 43 and chain receiving room 22, access 23 is by introducing port 43a and oilSeparation chamber 43 is communicated with.

Thus, can make blow-by gas flow directly to oil separation chamber 43 from chain receiving room 22. CauseThis, can directly take a breath to chain receiving room 22 by access 23, can prevent chain receiptsReceive in chamber 22 and produce greasy filth.

The blow-by gas that is imported into oil separation chamber 43 by access 23 from chain receiving room 22 withPartition wall 43A collision and oil separated after, be imported into oil separation chamber 42. In addition, blowby gasBody is imported into oil separation chamber 43 from crank chamber 24 by access 20.

From chain receiving room 22 and crank chamber 24 be imported into blow-by gas oil separation chamber 42 withPartition wall 42A, 42B collision and oil separated after, be imported into oil separation chamber 44. Oil separatesExtend upward from oil separation chamber 42 chamber 44, therefore, even if be imported into oil separation chamber 44After blow-by gas in still contain under oil condition, oil also can be because deadweight separates.

Blow-by gas in oil separation chamber 17 after separating oil from leadout hole 41A by blowbyThe arm 34 of gas eduction tube 36, inlet manifold 33 is imported into combustion chamber 14.

According to the engine 1 of present embodiment, form highlightedly from the sidewall 2B of cylinder block 2Oil separation chamber 17 have with the projected direction of starting motor 52 and extend substantially in parallelThe oil separation chamber 42 of linearity, a part for starting motor 52 is projected into oil from flange portion 51The space of the below of separation chamber 42.

Thus, can make the outstanding quantitative change of oil separation chamber 17 with respect to the sidewall 2B of cylinder block 2Greatly, and starting motor 52 can be arranged to such an extent that approach the sidewall 2B of cylinder block 2. Therefore,Can either make the capacity change of oil separation chamber 17 improve greatly oily separating property, can rise againMoving motor 52 and cylinder block 2 arrange littlely jointly, can realize the small-sized of engine 1Change.

In addition, according to the engine of present embodiment, be positioned at oil separation chamber 17 belowOn the sidewall 2B of cylinder block 2, be provided with outstanding from sidewall 2B and extend along bank of cylinder directionRib 53.

In addition, oil separation chamber 17 have be formed at oil separation chamber 42 an end 42c alsoAt the upwardly extending oil separation chamber in the side substantially vertical with the projected direction of starting motor 5243, taking sidewall 2B as bottom surface in the situation that, form by flange portion 51, rib 53, oil and separateThe recess 54 that chamber 42,43 and sidewall 2B surround, a part for starting motor 52 is from flange portion51 are projected into recess 54.

Thus, by a part for starting motor 52 is projected into by making oil separation chamber 42Give prominence to and the recess 54 of formation from the sidewall 2B of cylinder block 2 with oil separation chamber 43, can riseMoving motor 52 arranges near the sidewall 2B of cylinder block 2. Therefore, can be more effectively byStarting motor 52 and cylinder block 2 arrange littlely jointly, can more effectively realize and startingThe miniaturization of machine 1.

In addition, the situation as the projected direction of oil separation chamber 17 in the degree of depth using recess 54Under, by recess 54 is deepened, can make the overhang of oil separation chamber 17 with respect to sidewall 2BBecome large, therefore, can more effectively make the capacity of oil separation chamber 17 become large. Therefore, canMore effectively improve oily separating property.

In addition, according to present embodiment, cylinder block 2 possesses: crank chamber 24, it receives bentArbor 6; And chain cover 21, its be arranged on be positioned at be provided with flange portion 51 cylinder block 2 oneThe other end 2b of the cylinder block 2 of a contrary side of end 2a, for covering crank axle 6Driving force pass to the timing chain 11 of camshaft.

In addition, between chain cover 21 and cylinder block 2, be formed with chain receiving room 22, cylinderBody 2 has: access 23, and it is communicated with oil separation chamber 43 and chain receiving room 22; And be communicated withRoad 20, it is communicated with oil separation chamber 43 and crank chamber 24.

Thus, even make starting motor 52 approach the sidewall 2B of cylinder block 2, also canMake the capacity of oil separation chamber 17 become large, therefore, not only from crank chamber 24 also from chain receiving room22 import blow-by gas in the situation of oil separation chamber 43, can easily separate blow-by gasIn oil. Therefore, can suppress to contain oily blow-by gas because air-intake negative-pressure is sent toCombustion chamber 14. Therefore, can prevent such as the burn deterioration that produces white cigarette etc.

Embodiments of the present invention are more than disclosed, but clearly, those skilled in the artCan not depart from the scope of the present invention and be changed. Appended claim is intended to comprise instituteThis correction and the equivalent that have.

Claims

1. an internal combustion engine,

Possess: cylinder block, it has multiple cylinders; Oil separation chamber, it is formed as from above-mentionedThe sidewall of cylinder block is outstanding and for separating of the oil in blow-by gas; Flange portion, it is arranged onThe end of the above-mentioned cylinder block of above-mentioned bank of cylinder direction; And subsidiary engine, it is assemblied in above-mentioned methodOrchid portion and outstanding from above-mentioned flange portion along above-mentioned sidewall,

Above-mentioned internal combustion engine is characterised in that, above-mentioned oil separation chamber has straight line oil separation chamber, shouldStraight line oil separation chamber is parallel with the projected direction of above-mentioned subsidiary engine,

At least a portion of above-mentioned subsidiary engine is projected into above-mentioned straight line oil from above-mentioned flange portion and separatesThe space of the below of chamber.

2. internal combustion engine according to claim 1, is characterized in that,

Be positioned at above-mentioned oil separation chamber above or below the above-mentioned side of above-mentioned cylinder blockOn wall, be provided with from above-mentioned sidewall rib outstanding and that extend along bank of cylinder direction,

Above-mentioned oil separation chamber has vertical oil separation chamber, and above-mentioned vertical oil separation chamber is formed atState the end of the bearing of trend of straight line oil separation chamber, vertical with the projected direction of above-mentioned subsidiary engineDirection on extend,

Taking above-mentioned sidewall as bottom surface in the situation that, form by above-mentioned flange portion, above-mentioned rib,The recess of above-mentioned straight line oil separation chamber, above-mentioned vertical oil separation chamber and above-mentioned side walls enclose, onAt least a portion of stating subsidiary engine is projected into above-mentioned recess from above-mentioned flange portion.

3. internal combustion engine according to claim 1 and 2, is characterized in that,

Above-mentioned cylinder block possesses: crank chamber, and it receives crank axle; And chain cover, its settingIn the above-mentioned end that is positioned at the above-mentioned cylinder block that is provided with above-mentioned flange portion across above-mentioned sidewallThe end of above-mentioned cylinder block of a contrary side, for covering the driving force of above-mentioned crank axlePass to the timing chain of camshaft,

Between above-mentioned chain cover and above-mentioned cylinder block, be formed with chain receiving room,

Above-mentioned cylinder block has: the 1st access, it is communicated with above-mentioned oil separation chamber and above-mentioned chainReceiving room; And the 2nd access, it is communicated with above-mentioned oil separation chamber and above-mentioned crank chamber.