CN103249923A

CN103249923A - Gas-liquid separation device for four-stroke engine, and lubrication device for four-stroke engine

Info

Publication number: CN103249923A
Application number: CN2011800576650A
Authority: CN
Inventors: 富田敏裕; 久保田宏; 菊地良成; 杉山浩二; 栗本真树
Original assignee: Makita Corp
Current assignee: Maruyama Manufacturing Co Ltd
Priority date: 2010-11-30
Filing date: 2011-09-28
Publication date: 2013-08-14
Anticipated expiration: 2031-09-28
Also published as: BR112013010427B1; WO2012073586A1; CN103249923B; BR112013010427A2

Abstract

The present invention provides a kind of gas-liquid separation device of the four-stroke engine of gas-liquid separation for more ensuring lubricating oil and gas blowby and the lubricating arrangement of four-stroke engine, so that lubricating oil will not be emitted into combustion chamber. Oil eliminator (51) of the invention have formed from oil circulation path branch, the gas-liquid separation chamber (117) for isolating mist of oil from the gas blowby containing mist of oil, gas-liquid separation chamber (117) includes the first opening portion (103), imports gas blowby from oil circulation path; Second opening portion (105), makes the lubricating oil isolated from gas blowby be back to oil circulation path; The gas blowby for being separated mist of oil is vented from gas-liquid separation chamber, and is connected to the inlet channel toward combustion chamber by third opening portion (501g). First opening portion (103) is formed in the first wall (101), third opening portion (501g) is formed in the second wall (501d), in gas-liquid separation chamber (117), gas-liquid separate component is formed between the first opening portion (103) and third opening portion (501g).

Description

The gas-liquid separation device of four stroke engine and the lubricating fitting of four stroke engine

Technical field

The present invention relates to a kind of for separating of the mist of oil of four stroke engine and the gas-liquid separation device of gas blowby, and the lubricating fitting of four stroke engine.

Background technique

Owing to reasons such as severization surging to the consciousness of environmental problem and the exhaust regulation, mowing machine and backpack working machine, carry or bearing the driving motor of the working machine that carries out operation as operating personnel oneself, just be replaced by four stroke engine gradually from two stroke engine.

This four stroke engine, because the quantity of its required parts is more than two stroke engine, so four stroke engine becomes heavy easily, portable working machine particularly, owing to be that to carry out operation when carrying working machine with the operating personnel be prerequisite, therefore, require its motor lightweight.

Therefore, develop to have the lubricated four stroke engine (with reference to patent documentation 1 and patent documentation 2) of utilizing pressure variation in the crankshaft room to make the lubricating fitting of lubrication oil circulation with pump needn't be set separately.This lubricating fitting has the safety check that is arranged on the crankshaft room bottom.This safety check is opened when malleation, and lubricant oil or mist of oil in the crankshaft room are transported in the accumulator.Passed through to be arranged on the lubricant oil of the connecting tube in the accumulator or the air distributing device that mist of oil is supplied to gas distributing chamber and drives this gas distributing chamber, sufficient lubricating oil will be supplied to gas distributing chamber and air distributing device.When the piston rising is mobile, be arranged on the intercommunicating pore opening in the crankshaft room, make crankshaft room and gas distributing chamber become connected state, thereby make the lubricant oil of alluvial in gas distributing chamber be back to crankshaft room.

Yet, in the lubricated path of lubricant oil, sneak into gas blowby, under the state that the gas blowby concentration in the lubricated path raises, if lubricant oil continues to mix with gas blowby, lubricant oil will further go bad, to the lubricated generation harmful effect of driver part.Therefore, generally take the gas blowby in will lubricated path to be disposed to the firing chamber, thereby prevent lubricant oil rotten measure in advance, also as patent documentation 1 record, frequent employing is communicated with the structure of gas distributing chamber and firing chamber by air cleaner.

The prior art document

Patent documentation

[patent documentation 1] Japanese documentation spy opens the 08-260926 communique

[patent documentation 2] Japanese documentation spy opens the 2007-224824 communique

Summary of the invention

The problem that invention will solve

Usually, around bent axle, need the lubricant oil of high concentration, and at the lubricant oil that does not need high concentration as around the bent axle in the air distributing device.

Existing lubricating fitting, utilize the pressure in the crankshaft room to change, the concentration of the lubricant oil in the crankshaft room or mist of oil is not adjusted and directly be delivered to gas distributing chamber and air distributing device, therefore for lubricated air distributing device, there are excessive lubricant oil or mist of oil to send into gas distributing chamber, the lubricants capacity that causes depositing in gas distributing chamber is too much, also discharges lubricant oil when discharging gas blowby to the firing chamber in a large number, thereby has the problem that exhausts lubricant oil in advance.Therefore, the time of make-up oil shortens, if untimely make-up oil will cause insufficient lubrication.In addition, if the lubricant oil discharge amount of firing chamber is further increased, then lubricant oil will be disposed to the outside from baffler in large quantities with unburned state, might produce harmful effect to environment.

The present invention finishes in view of above-mentioned background, it is a kind of in order to preventing that lubricant oil is disposed to the firing chamber that its purpose is to provide, thereby can more positively be lubricated oil and the gas-liquid separation device of the four stroke engine of the gas-liquid separation of gas blowby and the lubricating fitting of four stroke engine.

For the scheme of dealing with problems

For addressing the above problem, the invention provides a kind of gas-liquid separation device of four stroke engine, it is characterized in that, have from oily circulating path branch and form, be used for from the gas-liquid separation chamber that the gas blowby that contains mist of oil is isolated mist of oil, above-mentioned gas-liquid separation chamber has: first opening portion, and it imports above-mentioned gas blowby from above-mentioned oily circulating path; Second opening portion, it makes from the isolated lubricant oil of above-mentioned gas blowby and is back to above-mentioned oily circulating path; The 3rd opening portion, its gas blowby that will be separated mist of oil is from the exhaust of above-mentioned gas-liquid separation chamber, and be communicated to the gas-entered passageway toward the firing chamber, above-mentioned first opening portion is formed at first wall, above-mentioned the 3rd opening portion is formed at second wall, in above-mentioned gas-liquid separation chamber, between above-mentioned first opening portion and above-mentioned the 3rd opening portion, be formed with gas-liquid separate component (claim 1).

By above-mentioned constitutive requirements, particularly this gas-liquid separation device has gas-liquid separate component, thereby can suitably isolate aqueous lubricant oil from gas blowby.

In addition, owing to can suitably separate lubricant oil, thus can suppress the consumption of lubricant oil, and then suppress environment is had the discharging of dysgenic unburned lubricant oil.

According to an aspect of the gas-liquid separation device of four stroke engine of the present invention, the inflow direction of the gas blowby that flows into from above-mentioned first opening portion and the outflow direction of the gas blowby that flows out from above-mentioned the 3rd opening portion form the position relation of reversing (claim 2).

Owing to have such structure, gas-liquid separation device of the present invention can suitably be isolated aqueous lubricant oil from gas blowby.

An aspect according to the gas-liquid separation device of four stroke engine of the present invention, above-mentioned first opening portion is formed near the central authorities of above-mentioned first wall, above-mentioned the 3rd opening portion be formed at above-mentioned second wall last side direction position about on arbitrary position in two corners (claim 3).

Owing to have such structure, the gas-liquid separation device of four stroke engine of the present invention can more suitably carry out gas-liquid separation.

According to an aspect of gas-liquid separate component of the present invention, above-mentioned gas-liquid separate component is for having the pad (claim 4) of a plurality of central through holes near in the central.

Owing to have such structure, the gas-liquid separation device of four stroke engine of the present invention can separate the big lubricant oil of oil droplet in the aqueous lubricant oil by first pad.

An aspect according to gas-liquid separate component of the present invention, arbitrary position in two corners be formed with above-mentioned second opening portion at the lower side of above-mentioned first wall to about the position, on above-mentioned first wall, to surround the mode of above-mentioned first opening portion, position, the above-mentioned central through hole more lateral of ratio in above-mentioned pad is formed with ditch portion, form duct-like lubricant oil return passage by above-mentioned ditch portion and above-mentioned pad, above-mentioned lubricant oil return passage is communicated with (claim 5) with above-mentioned second opening portion.

Owing to have such structure, the gas-liquid separation device of four stroke engine of the present invention can make the aqueous lubricant oil that is separated in first pad discharge from second opening portion efficiently.

According to an aspect of gas-liquid separate component of the present invention, on the corner of above-mentioned pad, on the position of above-mentioned second opening portion of being formed with of above-mentioned first wall, be formed with through hole (claim 6).

Owing to have such structure, the gas-liquid separation device of four stroke engine of the present invention can make by the aqueous lubricant oil that is separated behind first pad, also can discharge from second opening portion efficiently.

According to an aspect of gas-liquid separate component of the present invention, above-mentioned gas-liquid separate component is the pad (claim 7) that is formed with through hole on the corner location of the opposition side of last side direction position and above-mentioned the 3rd opening portion formation side.

Owing to have such structure, the gas-liquid separation device of four stroke engine of the present invention flows into gas-liquid separation chamber by the gas blowby that contains aqueous lubricant oil by first opening portion, and the gas blowby of inflow collides second pad, thus separable aqueous lubricant oil.

In addition, the through hole of second pad is formed on the position of the opposition side that is formed with the 3rd opening portion side, therefore, the gas blowby by this through hole is discharged swimmingly from the 3rd opening portion.

According to an aspect of gas-liquid separate component of the present invention, arbitrary position in two corners be formed with above-mentioned second opening portion (claim 8) at the lower side of above-mentioned first wall to about the position.

Owing to have such structure, the gas-liquid separation device of four stroke engine of the present invention can more positively discharge aqueous lubricant oil from second opening portion.

An aspect according to gas-liquid separate component of the present invention, the Power Available Shaft side of the four stroke engine about above-mentioned second opening portion is formed in two corners, in two corners and opposition side (claim 9) above-mentioned live axle about above-mentioned the 3rd opening portion is formed at.

Owing to have such structure, with Power Available Shaft down the time, lubricant oil after the gas-liquid separation can more easily be got back to oily circulating path from second opening portion, and with Power Available Shaft up the time, the locational through hole that is formed at the opposite corner of above-mentioned the 3rd opening portion formation side can become more up, can more suitably isolate aqueous lubricant oil from gas blowby by this.

According to an aspect of gas-liquid separate component of the present invention, above-mentioned gas-liquid separate component has mesh shape (claim 10).

Owing to have such structure, the gas-liquid separation device of four stroke engine of the present invention also can be isolated the little mist of oil of oil droplet.

Above-mentioned first wall forms and above-mentioned second wall relative (claim 11).

Owing to have such structure, can fully guarantee to be formed with the space of gas-liquid separate component.

An aspect according to above-mentioned gas-liquid separate component of the present invention, it has near have a plurality of through holes central authorities first pad, in last side direction position and above-mentioned the 3rd opening portion position in corner that forms the opposition side of side be formed with second pad of through hole, and the net of mesh shape, above-mentioned first pad, above-mentioned second pad and above-mentioned net, from the above-mentioned first opening portion side, it is the arranged in order (claim 12) by above-mentioned first pad, above-mentioned net and above-mentioned second pad.

Owing to have such structure, by the complementary effect of first pad, second pad and above-mentioned net, can more effectively isolate mist of oil.

An aspect according to above-mentioned gas-liquid separate component of the present invention, it has near first pad that has a plurality of through holes central authorities, and form second pad that is formed with through hole on the position in corner of opposition side of side in last side direction position and above-mentioned the 3rd opening portion, above-mentioned first pad and above-mentioned second pad, from the above-mentioned first opening portion side, it is the arranged in order (claim 13) by above-mentioned first pad, above-mentioned second pad.

Owing to have such structure, by the complementary effect of above-mentioned first pad and above-mentioned second pad, can more effectively isolate aqueous lubricant oil.

An aspect according to above-mentioned gas-liquid separate component of the present invention, it has near first pad that has a plurality of through holes central authorities, and the net of mesh shape, above-mentioned first pad and above-mentioned net, from the above-mentioned first opening portion side, it is the arranged in order (claim 14) by above-mentioned first pad, above-mentioned net.

Owing to have such structure, by the complementary effect of above-mentioned first pad and above-mentioned net, can more effectively isolate aqueous lubricant oil.

An aspect according to above-mentioned gas-liquid separate component of the present invention, it has second pad that is formed with through hole on the position in the corner of the opposition side of last side direction position and above-mentioned the 3rd opening portion formation side, and the net of mesh shape, above-mentioned second pad and above-mentioned net, from the above-mentioned first opening portion side, it is the arranged in order (claim 15) by above-mentioned net, above-mentioned second pad.

Owing to have such structure, by the complementary effect of above-mentioned second pad and above-mentioned net, can more effectively isolate aqueous lubricant oil.

An aspect according to the lubricating fitting of four stroke engine of the present invention, it utilizes the pressure in the crankshaft room that the to-and-fro motion because of piston produces to change, lubricant oil is supplied to as the part of above-mentioned oily circulating path and the above-mentioned crankshaft room and the gas distributing chamber that constitute, thereby be lubricated, it is characterized in that, the put-through channel that is communicated with above-mentioned gas distributing chamber and above-mentioned crankshaft room when being provided with in above-mentioned crankshaft room to negative pressure, the open end to above-mentioned crankshaft room inner opening of above-mentioned put-through channel, be set to its at above-mentioned piston near the opening when top dead center moves of the position top dead center, and during lower dead center moves, close near the position above-mentioned top dead center at above-mentioned piston, and second opening portion of the described gas-liquid separation device of claim 1 is connected (claim 16) with above-mentioned put-through channel.

Owing to have such structure, can make by the gas-liquid separation device separated lubricating oil and be recycled to oily circulating path more efficiently.

An aspect according to the lubricating fitting of four stroke engine of the present invention, it utilizes the pressure in the crankshaft room that the to-and-fro motion because of piston produces to change, use above-mentioned oily circulating path to make lubrication oil circulation, thereby carry out lubricating each one, it is characterized in that, be communicated with second opening portion of the described gas-liquid separation device of claim 1 and the return flow line of above-mentioned crankshaft room when being provided with in above-mentioned crankshaft room to negative pressure, the open end to above-mentioned crankshaft room inner opening of above-mentioned return flow line, be set to its at above-mentioned piston near the opening when top dead center moves of the position top dead center, and during lower dead center moves, close (claim 17) at above-mentioned piston near the position above-mentioned top dead center.

An aspect according to the lubricating fitting of four stroke engine of the present invention, it is characterized in that, have and make the 4th opening portion that is back to above-mentioned oily circulating path from the isolated lubricant oil of above-mentioned gas blowby, on the position in the lower side of above-mentioned first wall two corners to about the position, be formed with above-mentioned second opening portion and above-mentioned the 4th opening portion (claim 18) respectively.

Owing to have such structure, can improve the lubricant oil emission effect of gas-liquid separation chamber.

The effect of invention

Gas-liquid separation device according to four stroke engine of the present invention, can provide a kind of and can more positively be lubricated oil and the gas-liquid separation of gas blowby, thereby prevent that lubricant oil is discharged into the gas-liquid separation device of four stroke engine of firing chamber and the lubricating fitting of four stroke engine.

Description of drawings

Fig. 1 is the schematic illustration of lubricating fitting of the four stroke engine of the present invention's first example.

Fig. 2 is the explanatory drawing of air cleaner.

Fig. 3 is the explanatory drawing of oil separator.

Fig. 4 is from the structure explanatory drawing of the gas-liquid separation chamber that the A direction is observed among Fig. 3.

Fig. 5 is the explanatory drawing of Fig. 4 center line V-V section.

Fig. 6 is the explanatory drawing that separates pad, separating grid, separation bounding means, separating plate.

Fig. 7 be second opening portion of the working tool as mowing machine when placing ground side with the through hole that separates bounding means between the explanatory drawing of relation.

Fig. 8 be second opening portion of the working tool as the olive cropper when placing opposition side with ground side with the through hole that separates bounding means between the explanatory drawing of relation.

Fig. 9 is the explanatory drawing of the shape variation of gas-liquid separation chamber.

Figure 10 is the explanatory drawing that separates the variation of pad.

Figure 11 is the explanatory drawing of the variation of separating grid.

Figure 12 is the schematic illustration of lubricating fitting of the four stroke engine of second example of the present invention.

Figure 13 is the part explanatory drawing of the air purifying plate of other examples of the present invention.

Figure 14 is the schematic illustration of the gas-liquid separation device of other examples of the present invention.

Embodiment

＜the first example 〉

The following preferable example that the lubricating fitting of four stroke engine of the present invention is described with reference to accompanying drawing 1 to 4.Because lubricating fitting is installed on the four stroke engine, therefore utilize Fig. 1 (schematic representation) that the four stroke engine that this lubricating fitting is installed is described.

Four stroke engine when in addition, Fig. 1 is illustrated in piston and is positioned at the state of top dead center.

As shown in Figure 1, four stroke engine 1 have cylinder head 3a by integrated cylinder block 3, be installed in cylinder block 3 bottoms and form the crankcase 5 of the 5a of crankshaft room, and be configured in crankcase 5 lower sides to locational accumulator 7.

Accumulator 7 arranges separately with crankcase 5, is used for storing lubricant oil A (being designated hereinafter simply as " lubricant oil A ").

In cylinder block 3 attachment portion with crankcase 5, rotation is supported with bent axle (not shown) freely, on this bent axle, is connected with piston 6 by counterpoise and coupled connecting rod etc.Piston 6 inserts in the cylinder 3b that is arranged in the cylinder block 3 sliding freely.

The upper wall of cylinder 3b in being arranged at cylinder block 3 is provided with the suction port and the relief opening that are connected with vaporizer (not shown) and muffler (not shown) respectively, is equipped with suction valve and outlet valve for switch port in these each ports.

At this, the four stroke engine 1 of this example also can portablely be used, and this moment, four stroke engine 1 might be used temporarily being rotated under the state that turns upside down.

Drive the distribution device 10 of these valves, by be fixed on valve actuation gear 10a on the bent axle, driven and be connected with the cam mechanism 10b of cam by valve actuation gear 10a, and rocking arm parts such as (not shown) constitute.

In this distribution device 10, valve actuation gear 10a and cam mechanism 10b are housed in connection in the set valve actuation chamber 32 midway of the service duct 31 of gas distributing chamber 4 that the head of cylinder block 3 forms and accumulator 7, and parts such as rocking arm are arranged in the gas distributing chamber 4.

Between accumulator 7 and cylinder block 3, be provided with oil supply gallery 34.End in the accumulator side of oil supply gallery 34 is equipped with suction portion 35.

Suction portion 35 have by the rubber elastomeric material formed, can be easily crooked body 35a and be installed in the spindle 35b that has suction port of the tip portion of body 35a.

The spindle 35b of suction portion 35 is installed in vertical lower side direction position movably by gravity, therefore, even accumulator 7 tilts, also can make below the pasta of the lubricant oil A that the suction port of suction portion 35 scope of amount according to the rules of submerging stores.

Oil supply gallery 34 is, because the rising of piston 6 makes when the negative pressure tendency occurring in the 5a of crankshaft room, is communicated with in the 5a of crankshaft room with accumulator 7 and draws lubricant oil A from accumulator 7 and be supplied to part in the 5a of crankshaft room.

Open end 34a to the 5a of the crankshaft room side opening of oil supply gallery 34, be arranged on piston 6 and during top dead center moves, follow the movement of piston 6 near the position top dead center and the position of opening, be positioned at the skirt section 6a lower dead center direction side of the piston bottom of moving near the position top dead center.

Therefore, when piston 6 arrived top dead center, the open end 34a of oil supply gallery 34 had been in the state of opening fully.

In addition, oil supply gallery 34 by at its open end 34a leaf valve being set, perhaps arranging passage at bent axle it is played a role etc. as rotary valve, when being the state of negative pressure in the 5a of crankshaft room, also can be communicated with oil supply gallery 34 and the 5a of crankshaft room.

Be provided with one-way valve 37 midway at oil supply gallery 34.This one-way valve 37 is set to along with the pressure in the 5a of crankshaft room changes and opens and closes, and the pressure in the 5a of crankshaft room is lower than under the pressure status in the accumulator 7 to be opened, and makes oil supply gallery 34 become connected state, and the pressure in the 5a of crankshaft room is closed when higher.

Between the bottom and accumulator 7 of the 5a of crankshaft room, be provided with the runner 39 that is communicated with the 5a of crankshaft room and accumulator 7.This runner 39 is used for the lubricant oil that the mist of oil that will generate and the liquefaction of this mist of oil generates and is delivered to accumulator 7 in the 5a of crankshaft room.

Open end 39a to crankshaft room's side opening of runner 39 is provided with leaf valve 40.This leaf valve 40 is set to along with the pressure in the 5a of crankshaft room changes and opens and closes, and the malleation in the crankshaft room by piston 6 during to the lower dead center side shifting is opened, and makes runner 39 become connected state.

Therefore, runner 39 is in connected state if leaf valve 40 is opened, and then mist of oil and the lubricant oil in the 5a of crankshaft room will be delivered in the accumulator 7 via runner 39.

The space portion 7b of accumulator 7 is separated by the dividing plate 7c that has the pad function concurrently.

Be formed with the open end 31a of service duct 31 on the last side direction position of dividing plate 7c.

The open end 39b of the accumulator side of runner 39, the substantial middle place opening in accumulator 7 regardless of the heeling condition of accumulator 7, is configured in the above position of pasta that stores the lubricant oil A that is not higher than established amount.

Therefore, can not bubble because the mist of oil of discharging from the open end 39b of runner 39 is ejected into below the lubricant oil pasta in lubricant oil inside, and mist of oil can be back to accumulator 7 reposefully, and most mist of oil will be liquefied.

But a part of mist of oil of discharging from open end 39b can rebound at pasta and wall, is trapped in the space portion 7a of side direction position on the pasta in the accumulator 7.So be configured in the open end 39b of runner 39 of the above position of pasta of lubricant oil A, will play a role as the part of the liquid body of liquefaction mist of oil.

Therefore, from the mist of oil that runner 39 is discharged, its major part will be liquefied, thereby can reduce the oil mist concentration that is stored in the accumulator 7.

The open end 31a of service duct 31, the substantial middle portion opening of the inner space in accumulator 7, regardless of the heeling condition of accumulator 7, change even store the pasta position of the lubricant oil A that is not higher than established amount, also be configured to not make it to submerge below the pasta.In addition, as shown in Figure 1, be configured to respect to open end 31a, open end 39b is more outstanding.

Therefore as mentioned above, the open end 39b of runner 39 is configured to protrude from the accumulator 7 than the open end 31a of service duct 31, and the mist of oil of discharging from the open end 39b of runner 39 can directly not enter the open end 31a of service duct 31.More preferably, runner 39 and service duct 31 also can be configured in along with before each open end side and then on the direction away from adjacent open end.

Namely, with respect to the plane vertical with the bearing of trend (direction that dots) of runner 39 among the open end 39b, if the open end 31a of service duct 31 and near be configured in the bottom side of runner 39, then the mist of oil of discharging from runner 39 can directly not enter the open end 31a of service duct 31.

Just, the service duct 31 of accumulator 7 and the configuration of runner 39 are to play a role as the inflow blocking portion that stops the mist of oil of discharging from runner 39 to flow directly into the open end 31a of service duct 31.

Therefore, the oil mist concentration that flows through service duct 31 is lower than from oil supply gallery 34 and is supplied to concentration of lubricating oil in the 5a of crankshaft room.

The open end 31a of gas distributing chamber's 4 sides of service duct 31 is to cylinder block 3 side openings of gas distributing chamber 4.Therefore, flow through the distribution device 10 in the oil mist lubrication valve actuation chamber 32 of service duct 31, and discharge and be supplied in the gas distributing chamber 4 and the rocking arm in the lubricated gas distributing chamber 4 etc. from open end 31b.

Gas distributing chamber 4 is communicated with by push rod passage 33 with valve actuation chamber 32.

This push rod passage 33 is communicated to gas distributing chamber 4 by opening portion 31b.

Push rod connects this push rod passage 33, and push rod drives the rocking arm in the gas distributing chamber 4.

In addition, be formed with the wall member 45 of overshooting shape in the gas distributing chamber 4, be used for isolating mist of oil and the lubricated wet goods of liquefaction by the fluid (mist of oil, liquefaction lubricant oil, gas blowby) that flows into from push rod passage 33 in the gas distributing chamber 4.

In gas distributing chamber 4, be provided with a plurality of for the suction tube 43 that sucks the lubricant oil of alluvial in gas distributing chamber 4.

The open end 43a of gas distributing chamber's 4 sides of suction tube 43 is to cylinder block 3 side openings of gas distributing chamber 4.

And suction tube 43 is connected with attracting passage 42.Attract passage 42 to be arranged on the opposition side of the 5a of crankshaft room of gas distributing chamber 4, suction tube 43 is arranged to coupled leading to and is extended to gas distributing chamber's 4 interior crankshaft room's sides, and the top of suction tube 43 is in opening state.

For the crankshaft room's side bottom surface sucking-off lubricant oil in gas distributing chamber 4, the open top end of suction tube 43 is configured near the position of the crankshaft room side bottom surface of gas distributing chamber 4.

And suction tube 43 is configured in the corner of gas distributing chamber 4, even four stroke engine 1 is positioned at run-off the straight under the state of side direction position in gas distributing chamber 4, and also can be by the lubricant oil of arbitrary suction tube 43 sucking-offs alluvial in gas distributing chamber 4.

In addition, attracting passage 42 to be provided with a plurality of apertures 44.This aperture 44 is configured in the corner of the 5a of the crankshaft room opposition side of gas distributing chamber 4, even four stroke engine 1 is positioned at lower side run-off the straight under the reverse state of position in gas distributing chamber 4, and also can be by the lubricant oil of arbitrary aperture 44 sucking-offs alluvial in gas distributing chamber 4.

Attract passage 42 to be provided with put-through channel 46, when being negative pressure state in the 5a of crankshaft room, gas distributing chamber 4 and the 5a of crankshaft room are connected by put-through channel 46.

The position of the open end 46a of crankshaft room's side of put-through channel 46, identical with the open end 34a of oil supply gallery 34, be arranged on piston 6 and during top dead center moves, follow the movement of piston 6 near the position top dead center and the position of opening, be positioned at the lower dead center direction side of the skirt section 6a of the piston bottom of moving near the position top dead center.

Therefore, when piston 6 reached top dead center, the open end 46a of put-through channel 46 had been in the state of opening fully.

In addition, on put-through channel 46, also can arrange and allow from gas distributing chamber 4 to the 5a of crankshaft room side flow, and the one-way valve of restriction lubricant oil 4 side flow from the 5a of crankshaft room to gas distributing chamber.

By above setting, can prevent definitely lubricant oil and mist of oil from the 5a of crankshaft room to gas distributing chamber 4 adverse currents.

One end 48a of breathing pipe 48 is to the substantial middle opening of gas distributing chamber 4, and the other end of breathing pipe 48 is connected with air cleaner 50.

Breathing pipe 48 is that purpose arranges gas blowby is disposed to the firing chamber.Mist of oil and gas blowby in the gas distributing chamber 4 are delivered to air cleaner 50 by breathing pipe 48, and by being arranged on oil separator 51 in the air cleaner 50 is become liquefaction by gas-liquid separation lubricant oil and gas blowby.

One end 48a of breathing pipe 48 is owing to the substantial middle opening to gas distributing chamber 4, so even be detained a large amount of lubricant oil in gas distributing chamber 4, also can not suck this lubricant oil simply.This breathing pipe 48 is provided with one-way valve, and by this one-way valve prevent gas blowby and mist of oil from air cleaner 50 to gas distributing chamber 4 side adverse currents.

Lubricant oil after the gas-liquid separation is delivered to the 5a of crankshaft room by the return flow line 52 that is communicated with air cleaner 50 and the 5a of crankshaft room.In return flow line 52, be provided with the one-way valve of only allowing to crankshaft room's side flow.On the other hand, the gas blowby after the gas-liquid separation is transported to the firing chamber.

Between the bottom and the 5a of crankshaft room of the accumulator side of valve actuation chamber 32, be provided be used to making backflow reflux passage 54 to the 5a of crankshaft room of lubricant oil in the valve actuation chamber 32.When in the 5a of crankshaft room, being negative pressure, by the lubricant oil of reflux passage 54 sucking-offs alluvial in valve actuation chamber 32.This reflux passage 54 constitutes less than 1/10 of the sectional area of runner 39.

When being malleation in the 5a of crankshaft room, leaf valve 40 is opened, and the 5a of crankshaft room and accumulator 7 are in connected state.Mist of oil and lubricant oil in the 5a of crankshaft room flow through the bigger runner of sectional area 39, and reflux passage 54 is in the state that lubricated oil stops up, so go up substantially can be from the 5a of crankshaft room adverse current to valve actuation chamber 32 for lubricant oil.In the present embodiment, the internal diameter of runner 39 is made as φ 9mm, the internal diameter of reflux passage 54 is made as φ 2mm.

In addition, reflux passage 54 also can be set to be communicated with valve actuation chamber 32 and above-mentioned put-through channel 46.By setting like this, reflux passage 54 just can not be to the lubricant oil of gas distributing chamber's 4 gluts.

In addition, also can in reflux passage 54, arrange allow lubricant oil to crankshaft room's side flow, restriction lubricant oil to the one-way valve of valve actuation chamber 32 side flow.So arrange, just can prevent definitely lubricant oil from adverse current in the 5a of crankshaft room to valve actuation chamber 32 sides.

In addition, between valve actuation chamber 32 and oil supply gallery 34, be provided with flow and adjust passage 56.

Flow is adjusted passage 56 by sucking the air in the valve actuation chamber 32, adjusts the flow of lubrication that is supplied to the 5a of crankshaft room by oil supply gallery 34.

If the intake of this air is more, the flow rate of lubricating oil of supplying with by oil supply gallery 34 will reduce.In addition, flow is adjusted passage 56 and is advisable to be arranged on away from the bottom of valve actuation chamber 32 and to be difficult to suck the position that is trapped in the lubricant oil in the valve actuation chamber 32.

Flow is adjusted the link position of passage 56 and oil supply gallery 34, is positioned at than the one-way valve 37 more close accumulator sides that are arranged on the oil supply gallery 34.

Therefore, if utilize one-way valve 37 to cut off the supply of lubricant oil, the lubricant oil that then will in than the oil supply gallery 34 of one-way valve 37 more close accumulator sides, deposit, and at the connection part alluvial lubricant oil of flow adjustment passage 56 with oil supply gallery 34.

Therefore, when oil supply gallery 34 is adjusted passage 56 and sucked air from flow, can not have only air to flow through oil supply gallery 34, the lubricant oil in the oil supply gallery 34 can with 32 carry and the air that comes together is delivered to the 5a of crankshaft room from the valve actuation chamber.

In this flow adjustment passage 56, be provided with the throttle valve 57 that is transported to the air mass flow of oil supply gallery 34 from valve actuation chamber 32 for adjusting.

Adjust from valve actuation chamber 32 amount of air drawn by adjusting throttle valve 57, thereby can adjust the flow of lubrication that is supplied to the 5a of crankshaft room by oil supply gallery 34.That is, the flow of forgetting it is adjusted the internal diameter of passage 56, only just can adjust flow of lubrication simply by the design of throttle valve 57.

In addition, throttle valve 57 need not to adjust passage 56 with flow and arranges separately, also can be to constitute the part that flow is adjusted passage 56.For example, form the part that flow is adjusted passage 56 along the sealing surface of cylinder block 3 and crankcase 5, in case on sealing surface, be connected with oil supply gallery 34, just can constitute throttle valve 57 very simply.

That is, the lubrication oil circulation path of lubricating fitting 30 is constituted as and comprises: oil supply gallery 34, runner 39, service duct 31, push rod passage 33, suction tube 43, aperture 44, attraction passage 42, put-through channel 46, breathing pipe 48, return flow line 52, reflux passage 54 and flow are adjusted passage 56.

If four stroke engine 1 starts, because the pressure that the elevating movement of piston 6 will produce in the 5a of crankshaft room changes, pressure when piston 6 rises in the 5a of crankshaft room reduces and the negative pressure tendency occurs, and the pressure when piston 6 descends in the 5a of crankshaft room raises and the malleation tendency occurs.

If occur the negative pressure tendency in the 5a of crankshaft room, the open end 34a of oil supply gallery 34 begins to follow piston 6 to open near the movement the top dead center, and when the 5a of crankshaft room is connected with accumulator 7, the negative pressure in the 5a of crankshaft room will act on oil supply gallery 34.

Even four stroke engine 1 run-off the straight, the suction portion 35 of oil supply gallery 34 still is in the following state of lubricant oil A pasta of the accumulator 7 that submerges, and sucks lubricant oil A and is delivered in the 5a of crankshaft room from accumulator 7.When piston 6 arrived top dead center, open end 34a had been in the state of opening fully, so the negative pressure in the 5a of crankshaft room can be acted on oil supply gallery 34 fully.

Therefore, can in the 5a of crankshaft room, supply with fully from the lubricant oil A that draws below the pasta.

Be transported to the lubricant oil in the 5a of crankshaft room, in driver parts such as lube pistons 6, bent axle, by these driver parts formation mist of oil that disperses.Part mist of oil is attached to the wall of the 5a of crankshaft room and is liquefied again.

When piston 6 descends from top dead center, become barotropic state in the 5a of crankshaft room, leaf valve 40 is open, and the 5a of crankshaft room and accumulator 7 are connected.Then, the mist of oil that boosts in the 5a of crankshaft room and lubricant oil are delivered to accumulator 7 via runner 39, and the pressure in the accumulator 7 raises.Take place to collide and liquefy from the pasta of runner 39 mist of oil of discharging and the lubricant oil A in accumulator 7 that deposits and the wall of accumulator 7, be stored in accumulator 7.

In accumulator 7 internal cause collisions and bounce-back and residual oil mist concentration is lower than the oil mist concentration in the 5a of crankshaft room.

In addition, if become barotropic state in the 5a of crankshaft room, will utilize the effect of one-way valve 37 cut off oil supply gallery 34, thereby stop lubricant oil from the 5a of crankshaft room adverse current to accumulator 7, then close open end 34a by piston 6.

Because the pressure in the accumulator 7 raises, produce pressure gradient in the accumulator 7 and between the gas distributing chamber 4, the mist of oil of alluvial in accumulator 7 will be delivered to gas distributing chamber 4 by service duct 31.

The process of the 4 conveying mist of oils from accumulator 7 to gas distributing chamber, each parts that is arranged on the distribution device 10 in the valve actuation chamber 32 on the service duct 31 are lubricated.At this moment, a part of mist of oil will be liquefied.

The lubricant oil that is not liquefied in valve actuation chamber 32 can be delivered to the 5a of crankshaft room by reflux passage 54.

Therefore, not only can suppress lubricant oil and excessively be trapped in the valve actuation chamber 32, can also suppress lubricant oil and flow out to gas distributing chamber 4.In addition, can also prevent that lubricant oil from stopping up service duct 31.

The oil mist lubrication that is supplied to gas distributing chamber 4 is arranged on the distribution device in the gas distributing chamber 4, and is delivered to the 5a of crankshaft room by put-through channel 46.

In addition, be detained even be supplied to the mist of oil liquefaction in the gas distributing chamber 4, the strong negative pressure in the 5a of crankshaft room still plays a role, and not only can carry lubricant oil in the 5a of crankshaft room, can also restrain lubricant oil and be trapped in gas distributing chamber 4.

Therefore, when discharging gas blowbies from gas distributing chamber 4 by breathing pipe 48, can suppress the release of lubricant oil.

Fig. 2 is the explanatory drawing of air cleaner 50.

In this definition direction.Side direction in this example, the vertical upper side direction (the paper top among Fig. 2) in the position relation when referring to not use the keeping of four stroke engine 1 etc.

Be somebody's turn to do the maximum duration that goes up side direction and be in four stroke engine 1 in the use state and use the vertical upper side direction basically identical of state.The direction opposite with side direction on this is called lower side to (the paper below among Fig. 2).

In addition, rod member 60 sides that tip portion is equipped with the various tool that is driven by four stroke engine 1 be defined as the rod member side (in Fig. 2, for paper to the upper left side to).With this rod member side be called in the opposite direction the rod member side in the other direction (in Fig. 2, for paper to the lower right to).

In addition, be through with transmission shaft in the rod member 60, this transmission shaft is connected with the Power Available Shaft of four stroke engine 1.In addition, this transmission shaft also is connected with various tool.As a result, various tool is driven by the power of four stroke engine 1.

And the direction opposite with the installation side of the four stroke engine 1 that air cleaner 50 is installed is called lateral direction (in Fig. 2, being paper direction to left down).With this internal side be called in the opposite direction interior side direction (in Fig. 2, for paper to the upper right to).

In addition, position that what is called is reversed relation refers in the flow direction of two fluids, even prolong the central shaft of both sides' flow direction, flow direction also not mutually the position of intersection concern.

Employed direction is all based on above-mentioned definition in Fig. 1.

As shown in Figure 2, in four stroke engine 1, tip portion etc. are equipped with the rod member 60 of the instrument that is driven by this four stroke engine 1, are connected on this rod member side direction.

This four stroke engine 1 is used in mowing machine (with reference to Fig. 7 (a)) or the olive cropper (with reference to Fig. 8 (a)).And if mowing machine, rod member 60 is along with the situation more (with reference to Fig. 7 (a)) that closely tilts to use earthward away from four stroke engine.In addition, if the olive cropper, along with the situation that tilts to use to the direction away from ground away from four stroke engine then more (with reference to Fig. 9 (a)).

And when stem member 60 was set at the place ahead direction, air cleaner 50 was disposed at the position of side direction on the left surface of four stroke engine 1.

Air cleaner 50 has to be drawn air and removes the dust and the rubbish that contain in this air, the function of air to gas handling system is provided, and further, in this example, has the function that gas blowby is delivered to gas handling system.

Air cleaner 50 by the air purifying plate 50b that is fixed on four stroke engine 1 side and removably air purification lid 50a form its shell.

In by this air purifying plate 50b and the formed inner space of air purification lid 50a, have for the space of removing air dust and rubbish, i.e. air purification space 50d and gas-liquid separation space 50c.

In the 50d of air purification space, dispose the first air purification filter spare 50e and the second air purification filter spare 50f that remove rubbish and dust in the air by filtering function.

The second air purification filter spare 50f is configured in the side than the more close air purifying plate 50b of the first air purification filter spare 50e.

In addition, the first air purification filter spare 50e is formed by sponge etc., and the second air purification filter spare 50f is formed by felt etc.

Fig. 3 is the explanatory drawing of oil separator 51.

As shown in Figure 3, oil separator 51 is that gas-liquid separation space 50c, separating plate 501 and gas-liquid separate component 601 by air cleaner 50 formed.

In addition, separating plate 501 is disposed in gas-liquid separation space 50c and the air purification passage configuration portion 113.

The air purification passage configuration portion 113 that gas-liquid separation space 50c is communicated with air purification space 50d is formed at the reciprocal position of rod member side of the rod member 60 of air purification space 50d.

Gas-liquid separation space 50c slightly is dimetric first wall 101 by side direction in being formed at, and this first wall 101 is formed the direction side of extending laterally as the base.In addition, gas-liquid separation space 50c is towards the lateral direction opening.

This side is formed by first side 107, second side 109 and the 3rd side 111.First side 107, second side 109 and the 3rd side 111 be direction toward the outer side, by the order formation of first side 107, second side 109 and the 3rd side 111.

First side 107, second side 109 and the 3rd side 111 are to become (in the lump with reference to Fig. 5) that big mode forms with the order opening by first side 107, second side 109 and the 3rd side 111.

In the 50c of gas-liquid separation space, separate pad 201, separating grid 301, separate bounding means 401 and separating plate 501, disposed in regular turn toward lateral direction by first wall 101.

At this, separate pad 201, separating grid 301 and separation bounding means 401 and constituted gas-liquid separate component 601.

In by 107 formed spaces, first side, dispose and separate pad 201, separating grid 301 and separate bounding means 401.

In 109 formed spaces, second side, dispose separating plate 501.

Near the central authorities of first wall 101, be formed with first opening portion 103 that is communicated with breathing pipe 48.In addition, the lower side of first wall 101 to the position and rod member side direction position be formed with second opening portion 105 that is communicated with return flow line 52.

And as shown in Figure 4, second opening portion 105 is positioned at the corner in left side.

Certainly, if the corner also can be arranged on the right side, still be equivalent to left side the best of rod member side direction.

Face in the lateral direction of separating plate 501 is formed with the second wall 501d.

And, on the reciprocal position of rod member side of this second wall 501d, be formed with the 3rd opening portion 501g that is communicated with air purification passage 501c.

Form gas-liquid separation chamber 117 (with reference to Fig. 5) by this second wall 501d, first wall 101 and first side 107.

Contain from the gas blowby of the mist of oil of first opening portion, 103 inflows, at first, isolate the big oil of oil droplet in the mist of oil by separating pad 201.

Specifically, be that isolate can't be by being formed at the mist of oil of the central through hole 201d that separates pad 201.

Isolated mist of oil liquefaction, the lubricant oil after the liquefaction are by second opening portion 105, from gas-liquid separation chamber's 117 dischargings.

In addition, though contain the gas componant of lubricant oil in the gas blowby, only be described as gas blowby for convenience.

In addition, passed through to separate the gas blowby that contains mist of oil of pad 201, by netted separating grid 301.Thus, utilize mesh portion from gas blowby, to isolate the little mist of oil of oil droplet.

Isolated mist of oil liquefaction, the lubricant oil after the liquefaction are by after the pad corner through hole 201c that is formed at separation pad 201, by second opening portion 105, from gas-liquid separation chamber's 117 dischargings.

The gas blowby that contains mist of oil that has passed through separating grid collides the wall that separates bounding means 401, isolates mist of oil by this from gas blowby.

Then, isolated mist of oil liquefaction, the lubricant oil after the liquefaction is by separating grid 301, after the pad corner through hole 201c that is formed at separation pad 201, by second opening portion 105, from gas-liquid separation chamber's 117 dischargings.

Collide and separate bounding means 401 gas blowby afterwards, by being formed at the through hole 401c that separates on the bounding means 401.

Then, the gas blowby by this through hole 401c collides the second wall 501d that is formed at separating plate 501, is directed into the 3rd opening portion 501g.Then, by air purification passage 501c, be directed into air purification space 50d from the 3rd opening portion 501g.

Afterwards, in the 50d of air purification space, gas blowby is sneaked into via in the first air purification filter spare 50e and the second air purification filter spare 50f filtered air.

Then, sneak into the gas blowby in air inlet, in the firing chamber, burn.

Fig. 4 is from the structure explanatory drawing of the observed gas-liquid separation chamber 117 of A direction among Fig. 3.

Fig. 4 is presented at and only disposes the state that separates pad 201 among the 50c of gas-liquid separation space.

As shown in Figure 4, the middle position at first wall 101 is formed with first opening portion 103.In addition, be formed with second opening portion 105 in lower side to the position and on the rod member side position.

In first wall 101, be formed with than first wall 101 slightly laterally direction outstanding, with the formed protuberance 114 of the mode of surrounding first opening portion 103.

Owing to have this portion that spues, therefore form the ditch portion 116 that surrounds first opening portion 103.There is a cunette shape in ditch portion 116 for what be formed at first wall 101.

Ditch portion 116 be by toward rod member side direction and rod member side en to the long limit of extending, up side direction and lower side be to the minor face of extension, the rectangular ditch of formation.

Fit tightly first wall 101 by separating pad 201, thereby cover the top of this ditch portion 116, make it become duct-like shape.

The passage of this duct-like shape is called lubricant oil return passage 115.

In addition, on the position corresponding with each angle with OBL ditch portion 116, be formed with the pad corner through hole 201c that separates pad 201.

At this, periodically change negative pressure into by the 5a of crankshaft room, periodically suck fluid from second opening portion 105, so this lubricant oil return passage 115, just look like the function that has realized as the suction pipe.

By the function as this suction pipe, by separating grid 301 and separate that bounding means 401 separates and the lubricant oil of liquefaction, by pad corner through hole 201c, backflow to the return flow line 52 from second opening portion 105, can utilize as lubricant oil again.

Around second opening portion 105, be formed with chamfered section 105a.This chamfered section 105a has shapes such as circular cone shape.By this, the central through hole 201d of separated pad 201 separates, the lubricant oil of liquefaction backflows to the return flow line 52 from second opening portion 105.

Fig. 5 is the explanatory drawing of Fig. 4 center line V-V section.

Fig. 5 is different with Fig. 4, is to add to separate pad 201, disposes the explanatory drawing of separating grid 301, the V-V section when separating bounding means 401 and separating plate 501.

First opening portion 103 that gas-liquid separation chamber 117 is communicated with breathing pipe 48, and second opening portion 105 that gas-liquid separation chamber 117 is communicated with return flow line 52 are formed at first wall 101.

In addition, breathing pipe 48 forms abreast with return flow line 52.

Dispose separation pad 201, separating grid 301 in regular turn, separate bounding means 401 and separating plate 501 from first wall 101 sides.

In addition, be formed with first side 107, second side 109 and the 3rd side 111 in regular turn from first wall 101 sides.

And, from first wall 101 sides, first side 107, second side 109 and the 3rd side 111 with side direction on it and lower side to height and rod member side direction and the reciprocal width of rod member side elongated mode and forming in regular turn.

In this first side 107, dispose and separate pad 201, separating grid 301, separation bounding means 401.In addition, in second side 109, dispose separating plate 501.

In the inside of separating plate 501, be formed with the second wall 501d towards first wall 101 is used as the bottom surface, intralamellar part side 501h is used as the ditch shape gas blowby reduced space 501i of side.

This gas blowby reduced space 501i is communicated to air purification passage 501c via the 3rd opening portion 501g.

In addition, form gas-liquid separation chamber 117 by the second wall 501d, first wall 101 and first side 107.

Fig. 6 is the explanatory drawing that separates pad 201, separating grid 301, separates bounding means 401, separating plate 501.

Fig. 6 (a-1) is the figure by the observed separating plate 501 of B side of Fig. 3.Fig. 6 (a-2) is the sectional drawing of Fig. 6 (a-1).

Separating plate 501 is by plate main body portion 501a, and the air purification passage 501c that forms on last side direction position and rod member side opposite direction position forms.

Air purification passage 501c has the shape towards the tubulose of last side direction, direction inclination to the inside.

In plate main body portion 501a, be formed with the second wall 501d be used as the bottom surface, with intralamellar part side 501h be used as the side, as the formed gas blowby reduced space of the ditch of flat column 501i.

This gas blowby reduced space 501i is that the 3rd opening portion 501g is communicated with via plate passage 501e with the opening portion of air purification passage 501c.

This plate main body portion 501a is formed by rubber-like rubber etc., by being pressed in second side 109, also has the pad function.

On the lateral direction position of plate main body portion 501a, disposing for the metal panel beating that keeps separating plate 501 intensity is panel beating plate 501b.

Fig. 6 (b-1) is the figure by the observed separation bounding means 401 of B side of Fig. 3.Fig. 6 (b-2) is the sectional drawing of Fig. 6 (b-1).

The bounding means main body portion 401a that separates bounding means 401 has rectangular tabular.

In the rod member side direction position of bounding means main body portion 401a and go up on the side direction position and be formed with through hole 401c.

This bounding means main body portion 401a is formed by rubber-like rubber etc., by being pressed in first side 107, also has the pad function.

On the lateral direction position of bounding means main body portion 401a, disposing for the metal panel beating that keeps separation bounding means 401 intensity is panel beating plate 401b.

Fig. 6 (c-1) is the figure by the observed separating grid 301 of B side of Fig. 3.Fig. 6 (c-2) is the sectional drawing of Fig. 6 (c-1).

The net main body portion 301a of separating grid 301 has rectangular tabular.

This net main body portion 301a is formed by the webbed thread-like member of braiding.

The grid of this mesh members is more little, and the separation effect of mist of oil is then more high.

Fig. 6 (d-1) is the figure by the observed separation pad 201 of B side of Fig. 3.Fig. 6 (d-2) is the sectional drawing of Fig. 6 (d-1).

The 201a of shim body portion that separates pad 201 has rectangular tabular.

Central part at the 201a of this shim body portion is formed with central through hole 201d.

The through hole 201d of central authorities forms in central authorities one, and then side direction position, lower side respectively have one to, rod member side direction, rod member side anti position on this central hole.

In addition, be formed with pad corner through hole 201c respectively in four corners of the 201a of shim body portion.

The 201a of this shim body portion is formed by rubber-like rubber etc., by being pressed in first side 107, also has the pad function.Particularly the protuberance 114 by being crimped on first wall 101 has the function that forms lubricant oil return passage 115.

Being useful on the metal panel beating that keeps separating pad 201 intensity in the internal configurations of the 201a of shim body portion is panel beating plate 201b.

Fig. 7 be second opening portion 105 of the working tool as mowing machine when placing ground side with the through hole 401c that separates bounding means 401 between the explanatory drawing of relation.

Fig. 7 (a) is that working tool is the figure of mowing machine when being connected in rod member 60.In addition, shown in Fig. 7 (a), be connected with air cleaner 50 in the four stroke engine 1.

Then, the part of the air cleaner 50 of Fig. 7 (a) and rod member 60 are illustrated in Fig. 7 (b).

In addition, the main body portion of four stroke engine 1 has been omitted in the description of Fig. 7 (b).

Incidentally, if pasta 119 arrives the through hole 401c place that separates bounding means 401, just lubricant oil can pass through this through hole 401c, invade the gas blowby reduced space 501i(of separating plate 501 as shown in Figure 5).Thus, lubricant oil will be supplied to air purification space 50d in large quantities via air purification passage 501c.

As a result, producing that lubricant oil is consumed in a large number and lubricant oil becomes can't be by clean-burning problem.

Therefore, in this example, shown in Fig. 7 (a), the through hole 401c of second opening portion 105 and separation bounding means 401 is formed at rod member 60 sides, namely on the rod member side direction position.

In addition, as Figure 13, shown in Figure 14, at opposite location formation the 4th opening portion 106 of rod member 60, in order to be communicated with return flow line 52, to improve the emission effect at the lubricant oil of gas-liquid separation chamber 117.

If form above-mentioned situation, the working tool that is disposed at rod member 60 tops is being positioned at than four stroke engine 1 closely under the state of face side position during operation (for example, when four stroke engine 1 is used for mowing machine), air cleaner 50 can as Fig. 7 (a) as inclination.

Thus, shown in Fig. 7 (b), separating bounding means 401 and the lubricant oil that separates between the pad 201, will deposit in rod member side direction position and lower side on the position.

In this case, lubricant oil contacts second opening portion, 105 parts, all the time by 105 dischargings of second opening portion.

In addition, also identical with the lubricant oil that separates between the pad 201 at first wall 101.

Therefore, shown in Fig. 7 (b), the pasta 119 of the lubricant oil in the gas-liquid separation chamber 117 often remains under the low state.

Also therefore, in this case, can not produce lubricant oil a large amount of consume and lubricant oil become can't clean-burning problem.

Fig. 8 concerns explanatory drawing between its second opening portion 105 and the penetration hole 401c that separates bounding means 401 when being positioned at the position with the opposition side of ground side as the working tool of olive cropper.

Fig. 8 (a) is that working tool is the figure that the olive cropper is connected in rod member 60.

Shown in Fig. 8 (a), the working tool that is placed in rod member 60 tops sometimes is being positioned at than closely operation (when for example, four stroke engine 1 is used in the olive cropper) under the state of face opposition side position of four stroke engine 1.

In addition, even the working tool that is disposed at rod member 60 tops is installed during operation under the state that more is positioned at the ground side position than four stroke engine 1 be general purpose tool (for example, the instrument of mowing machine), according to circumstances, the working tool that is disposed at rod member 60 tops also might be temporarily or operation under the state that more is positioned at opposition side position, ground than four stroke engine 1 for good and all.

In addition, no matter be the working tool that is disposed at rod member 60 tops than closely operation under the state of face opposition side position of four stroke engine 1, still the working tool that is disposed at rod member 60 tops also has the instrument that can carry out both sides' operation to be installed on the situation of four stroke engine 1 than closely operation under the state of face opposition side position of four stroke engine 1.

In these cases, in the operation temporarily or often be the state shown in Fig. 8 (b).

That is, this pasta 119 deposits, and in the other direction position and lower side deposit frequently to pasta 119a on the position in the rod member side.And pasta 119 will temporarily rise to the level of pasta 119b.

If this is because pasta 119 does not rise to from the position of second opening portion 105 of gas-liquid separation chamber's 117 discharging lubricant oil, just can't be from gas-liquid separation chamber's 117 discharging lubricant oil.

But even in this case, because second opening portion 105 and through hole 401c are formed at rod member side direction position, therefore, pasta 119 can not arrive the through hole 401c place that separates bounding means 401.

That is, second opening portion 105 and through hole 401c are formed at rod member side direction position, can prevent a large amount of problems that consume of lubricant oil by this, and the not generation of clean-burning problem of lubricant oil.

Fig. 9 is the explanatory drawing of the shape variation of gas-liquid separation chamber 117.

In above-mentioned example, shown in Fig. 9 (a), gas-liquid separation chamber 117 is formed by rectangular first wall 101 and perpendicular first side 107 that erects, and is rectangular shape.

And first opening portion 103 is formed on the middle position of this first wall 101, and second opening portion 105 is formed at lower side on position and rod member side direction position.

Then, make the rod member side downward slightly in the other direction as long as four stroke engine 1 is inclined to, lubricant oil will can not touch second opening portion 105, and the anxiety of the discharging that can't be lubricated oil is arranged.

Therefore, in Fig. 9 (b), changed lower side in first side 107 to the position and the toss about shape of locational wall portion 121 of rod member.

This wall portion 121 has than the second opening portion 105 outstanding shape of side direction more upwards.

This wall portion 121 also can have as the shape as Fig. 9 (c).

That is, outstanding wall portion 121 has the upwards outstanding shape of side direction, so long as four stroke engine 1 be in do not tilt state the time lubricant oil shape that also concentrates on second opening portion, 105 sides get final product.

Figure 10 is the explanatory drawing that separates the variation of pad 201.

In above-mentioned example, shown in Figure 10 (a), four corners of separating pad 201 are formed with circular pad corner through hole 201c.The shape of this pad corner through hole 201c can be arbitrary shape.

In addition, shown in Figure 10 (b), form breach 201e on also can be in rod member side direction position and lower side to the position.

The position that forms this breach 201e also can be identical with the position that is formed with second opening portion 105.

Thus, identical with the position of second opening portion 105 by the position that makes otch 201e, can more easily be directed to second opening portion 105 by separating grid 301 and separation bounding means 401 separated lubricating oil.

That is, because be the structure that sucks lubricant oil from second opening portion 105, therefore the front position from second opening portion 105 will be drawn into maximum lubricant oil.

Therefore, pass through swimmingly in order to make most lubricant oil, be positioned at the pad corner through hole 201c of second opening portion, 105 front positions, comparatively suitable to have bigger through hole shape.

By this, otch 201e is suitable for guaranteeing big flow path.

In addition, otch 201e also can be simple big through hole shape.

Figure 11 is the explanatory drawing of the variation of separating grid 301.

In the above-described embodiments, shown in Figure 11 (a), net main body portion 301a is formed by net entirely.

But, inwhole unified necessity.

For example, shown in Figure 11 (b), also can form the sponge 301b of portion in the formation position of second opening portion 105.

Thus, by forming the above-mentioned sponge 301b of portion, the 301b of sponge portion is adsorpting lubrication oil, thereby can prevent spilling from air cleaner.

In addition, even is formed by net institute, also can be that the central authorities of net main body portion 301a are neighbouring (be formed with separation pad 201 central through hole 201d near) grid thinner, and the grid of other parts is thicker.

By above formation, the part that grid the is thinner mist of oil that can liquefy effectively, and the thicker part (301b of sponge portion) of grid can make the lubricant oil after the liquefaction be directed to second opening portion, 105 places more swimmingly.

＜the second example 〉

In first example, return flow line 52 is to connect via oil supply gallery 34 with being connected of the 5a of crankshaft room, and still, in second example shown in Figure 12, return flow line 52 is connected to put-through channel 46.In addition, omit the part explanation identical with first example.

Then, the open end of the 5a of the crankshaft room opening of 52 sides is set to the return flow line,, and closes during lower dead center moves near the position top dead center at piston 6 near the opening when top dead center moves of the position top dead center at piston 6.

By above-mentioned structure, can in oily circulating path, reclaim by 51 separated lubricating oil A of oil separator expeditiously.

Then, be recycled to oily circulating path expeditiously if can make from oil separator 51 separated lubricating oil A, then separated lubricating oil just can not be sent to the firing chamber, can prevent consuming excessively of lubricant oil A.

Certainly, for the circulation oil mass that makes lubricant oil A is stable, return flow line 52 is connected preferably via put-through channel 46 or directly connection with the 5a's of crankshaft room.

Below, the reason of structure as shown in Figure 2 is described.

Be delivered to the amount of the mist of oil of air cleaner 50 from gas distributing chamber 4, the inclination by four stroke engine 1 changes.

Particularly, if can carry lubricant oil to the 5a of crankshaft room from gas distributing chamber 4 swimmingly, the amount that then is delivered to the mist of oil of air cleaner 50 will tail off.Opposite, if can't carry lubricant oil A to the 5a of crankshaft room swimmingly, the amount that then is delivered to the mist of oil of air cleaner 50 will increase.

And, be delivered to the changing of volume production of the mist of oil of this air cleaner 50, can make the changing of volume production by oil separator 51 separated lubricating oil.

So-called changing of volume production by these oil separator 51 separated lubricating oil, the meaning of the changing of volume production of the lubricant oil A that refers in the recovery of oil lubrication circulating path.

Further, shown in first example, making via oil supply gallery 34 under return flow line 52 and the situation that the 5a of crankshaft room is connected, cooperate the amount that is delivered to the lubricant oil of return flow line 52 from oil separator 51, the amount of the lubricant oil A that draws from accumulator 7 also can change.

In this way, avoid the amount (the lubricant oil A that can be drawn to from oil supply gallery 34) of the lubricant oil A that reclaims at oily circulating path to change as far as possible, be conducive to stability and the outspent inhibition of lubricant oil A of four stroke engine 1.

Therefore, in second example, as shown in figure 12, connect return flow line 52 and the 5a of crankshaft room via put-through channel 46.In other words, do not connect return flow line 52 and the 5a of crankshaft room via oil supply gallery 34.

By above-mentioned structure, oil supply gallery 34 can separate with return flow line 52, and then can make the amount of the lubricant oil A that is drawn to via oil supply gallery 34 stable.

Above-mentioned structure can further reclaim in oily circulating path by the lubricant oil after oil separator 51 separation expeditiously.

And, be recycled to oily circulating path expeditiously if can make from oil separator 51 separated lubricating oil A, then isolated lubricant oil A just can not be sent to the firing chamber, can prevent consuming excessively of lubricant oil A.

In addition, the open end of the 5a of the crankshaft room opening of 52 sides to the return flow line, be set at piston 6 near the opening when top dead center moves of the position top dead center, and during lower dead center moves, close near the position top dead center at piston 6, by this can the sucking-off of more powerful ground be present in the lubricant oil of return flow line 52 (oil separator 51).

＜the three example 〉

In second example, as shown in figure 12, connect return flow line 52 and the 5a of crankshaft room via put-through channel 46.

But, also can not connect return flow line 52 and the 5a of crankshaft room via put-through channel 46.

By above-mentioned structure, can make that to be delivered to the amount of lubricant oil A of the 5a of crankshaft room via oil supply gallery 34 more stable.

Therefore, by above-mentioned structure, can make the circulation oil mass stable.

The structure of＜example and effect 〉

Oil separator 51 of the present invention has from oily circulating path branch and forms, is used for from the gas-liquid separation chamber 117 that the gas blowby that contains mist of oil is isolated mist of oil.

In addition, gas-liquid separation chamber 117 has first opening portion 103 that imports gas blowby from oily circulating path.

In addition, gas-liquid separation chamber 117 has makes second opening portion 105 that is back to oily circulating path from the isolated lubricant oil of gas blowby, and the gas blowby that will be separated mist of oil is from gas-liquid separation chamber's exhaust, and is communicated to toward the 3rd opening portion 501g of the gas-entered passageway of firing chamber.

And first opening portion 103 is formed at first wall 101, the three opening portion 501g and is formed at the second wall 501d, in gas-liquid separation chamber 117, is formed with gas-liquid separate component between first opening portion 103 and the 3rd opening portion 501g.

Such structure particularly because this oil separator 51 has gas-liquid separate component 601, thereby can suitably be isolated aqueous lubricant oil from the gas blowby of getting back to air inlet.

In addition, owing to can suitably isolate lubricant oil, thus can suppress consuming excessively of lubricant oil.And then can suppress environment is had the discharging of dysgenic unburned lubricant oil.

The inflow direction of the gas blowby that flows into from first opening portion 103 forms the position relation of reversing with the outflow direction of the gas blowby that flows out from the 3rd opening portion 501g.

Owing to have such structure, oil separator 51 can suitably be isolated aqueous lubricant oil from the gas blowby of getting back to air inlet.

First opening portion 103 is formed near the central authorities of first wall 101, the 3rd opening portion 501g be formed at the second wall 501d last side direction position about on arbitrary position in two corners.

Owing to have such structure, the oil separator 51 among the present invention can more suitably carry out gas-liquid separation.

An aspect of gas-liquid separate component 601 is for having the separation pad 201 of a plurality of central through hole 201d near in the central.

Owing to have such structure, oil separator 51 can separate the big oil of oil droplet in the aqueous lubricant oil by separating pad 201.

An aspect of gas-liquid separate component 601 of the present invention is for arbitrary position in two corners being formed with second opening portion 105 at the lower side of first wall 101 to about the position, on first wall 101 to surround the mode of first opening portion 103, be formed with ditch portion 116 in score from the position, central through hole 201d more lateral of pad 201, form duct-like lubricant oil return passage 115 by ditch portion 116 and separation pad 201, lubricant oil return passage 115 is communicated with second opening portion 105.

Owing to have such structure, oil separator 51 can make the aqueous lubricant oil that is separated in separating pad 201, efficiently from 105 dischargings of second opening portion.

On the corner of separating pad 201, on the position that is formed with second opening portion 105 of first wall 101, be formed with pad corner through hole 201c.

Owing to have such structure, oil separator 51 can make the aqueous lubricant oil that is separated behind the pad 201 by separating, also can be efficiently from 105 dischargings of second opening portion.

Gas-liquid separate component 601 is the separation bounding means 401 that is formed with through hole 401c on the corner location of the opposition side of last side direction position and the 3rd opening portion 501g formation side.

Owing to have such structure, oil separator 51 flows into gas-liquid separation chamber by the gas blowby that contains aqueous lubricant oil by first opening portion 103, and the gas blowby of inflow collides and separates bounding means 401, thus separable aqueous lubricant oil.

In addition, the through hole 401c that separates bounding means 401 is formed on the position of the opposition side that is formed with the 3rd opening portion 501g side, therefore, the gas blowby by this through hole 401c is discharged swimmingly from the 3rd opening portion 501g.

Be formed with second opening portion 105 on arbitrary position in the lower side of first wall 101 two corners to about the position.

Owing to have such structure, oil separator 51 can be more positively from the aqueous lubricant oil of second opening portion, 105 dischargings.

The Power Available Shaft side of the four stroke engine 1 about second opening portion 105 is formed in two corners, the opposition side of the live axle about the 3rd opening portion 501g is formed in two corners.

Owing to have such structure, form the through hole 401c that forms on the position in corner of opposition side of side in last side direction position and the 3rd opening portion 501g, separate with the position of the 3rd opening portion 501g.

As a result, the gas blowby by through hole 401c successfully can be induced to the 3rd opening portion 501g.

Gas-liquid separate component 601 has mesh shape.

Owing to have such structure, oil separator 51 also can be isolated the little mist of oil of oil droplet.

It is relative with the second wall 501d that first wall 101 forms.

Gas-liquid separate component 601 has near have a plurality of central through hole 201d central authorities separation pad 201, in last side direction position and the 3rd opening portion 501g position in corner that forms the opposition side of side be formed with the separation bounding means 401 of through hole 401c, and the separating grid 301 of mesh shape, separate pad 201, separate bounding means 401 and separating grid 301, since first opening portion, 103 sides, be by the arranged in order of separating pad 201, separating grid 301, separation bounding means 401.

Owing to have such structure, by the complementary effect of separating pad 201, separating bounding means 401 and separating grid 301, can more effectively separate mist of oil.

Gas-liquid separate component 601 has near the separation pad 201 that has a plurality of central through hole 201d central authorities, and forms the separation bounding means 401 that is formed with through hole 401c on the position in corner of opposition side of side in last side direction position and the 3rd opening portion 501g.

In addition, separating pad 201 and separate bounding means 401, since first opening portion, 103 sides, is by the arranged in order of separating pad 201, separating bounding means 401.

Owing to have such structure, by the complementary effect of separating pad 201 and separating bounding means 401, can more effectively separate aqueous lubricant oil.

Gas-liquid separate component 601 has near the separation pad 201 that has a plurality of central through hole 201d central authorities, and the separating grid 301 of mesh shape.

And, separate pad 201 and separating grid 301, since first opening portion, 103 sides, be by the arranged in order of separating pad 201 and separating grid 301.

Owing to have such structure, by separating the complementary effect of pad 201 and separating grid 301, can more effectively separate aqueous lubricant oil.

Gas-liquid separate component 601 has the separation bounding means 401 that is formed with through hole 401c on the position in the corner of the opposition side of last side direction position and the 3rd opening portion 501g formation side, and the separating grid 301 of mesh shape.

And, since first opening portion, 103 sides, be the arranged in order by separating grid 301, separation bounding means 401.

Owing to have such structure, by separating the complementary effect of bounding means 401 and separating grid 301, can more effectively separate aqueous lubricant oil.

The pressure of 5a changes in the crankshaft room that the lubricating fitting utilization of four stroke engine 1 produces because of the to-and-fro motion of piston 6, lubricant oil A is supplied to as the part of oily circulating path and the 5a of crankshaft room and the gas distributing chamber 4 that constitute, thereby be lubricated, the put-through channel 46 that is communicated with gas distributing chamber 4 and the 5a of crankshaft room when being provided with in the 5a of crankshaft room to negative pressure, the open end to the 5a of crankshaft room inner opening of put-through channel 46, be set to its at piston 6 near the opening when top dead center moves of the position top dead center, and during lower dead center moves, close near the position top dead center at piston 6.

Owing to have such structure, can make by oil separator 51 separated lubricating oil A and be recycled to oily circulating path more efficiently.

Pressure in the 5a of crankshaft room that the lubricating fitting utilization of four stroke engine 1 produces because of the to-and-fro motion of piston 6 changes, use oily circulating path to make lubricant oil A circulation, thereby carry out lubricating each one, be provided with the return flow line 52 that is communicated with second opening portion 105 and the 5a of crankshaft room of oil separator 51 when in the 5a of crankshaft room, being negative pressure, the open end to crankshaft room's inner opening of return flow line 52, be set to its at piston 6 near the opening when top dead center moves of the position top dead center, and during lower dead center moves, close near the position top dead center at piston 6.

Oil separator 51 is an example of the gas-liquid separation device of the four stroke engine among the present invention.

Separate pad 201, separating grid 301 and separate bounding means 401 and be the example in the gas-liquid separate component among the present invention.

Gas-liquid separate component can be made of the whole institutes that separate pad 201, separating grid 301 and separation bounding means 401, also can be by wherein any two are constituted, and can also be by wherein any is constituted.

Separate pad 201 and be an example of first pad among the present invention.

Separate bounding means 401 and be an example of second pad among the present invention.

Separating grid 301 is the example for the net among the present invention.

In addition, an example of the gas-liquid separation chamber among the present invention is gas-liquid separation chamber 117, and it is by the second wall 501d,

first wall

101 and 107 formed spaces, first side.That is, the space for separating of gas-liquid all can become gas-liquid separation chamber in the oily circulating path so long as be formed at, and there is no particular restriction.

In addition, the invention is not restricted to above mode of execution, the present invention can carry out change and the modification of various structure, formation.

Symbol description

1 ... four stroke engine, 46 ... put-through channel, 50 ... air cleaner, 50c ... the gas-liquid separation space, 51 ... oil separator (gas-liquid separation device of four stroke engine), 52 ... return flow line (put-through channel), 54 ... reflux passage, 56 ... flow is adjusted passage, 60 ... rod member, 101 ... first wall, 103 ... first opening portion, 105 ... second opening portion, 105a ... chamfered section, 106 ... the 4th opening portion, 107 ... first side, 113 ... air purification passage configuration portion, 114 ... protuberance, 115 ... the lubricant oil return passage, 116 ... ditch portion, 117 ... gas-liquid separation chamber, 121 ... wall portion, 201 ... separate pad (first pad), 201c ... pad corner through hole (through hole), 201d ... central authorities' through hole (through hole), 301 ... separating grid (net), 301b ... sponge portion, 401 ... separate bounding means (second pad), 401c ... through hole, 501 ... separating plate, 501d ... second wall, 501g ... the 3rd opening portion, 601 ... gas-liquid separate component

Claims

1. the gas-liquid separation device of a four stroke engine is characterized in that, have from oily circulating path branch to form, be used for from the gas-liquid separation chamber that the gas blowby that contains mist of oil is isolated mist of oil,

Above-mentioned gas-liquid separation chamber has:

First opening portion, it imports above-mentioned gas blowby from above-mentioned oily circulating path;

Second opening portion, it makes from the isolated lubricant oil of above-mentioned gas blowby and is back to above-mentioned oily circulating path;

The 3rd opening portion, its gas blowby that will be separated mist of oil be from the exhaust of above-mentioned gas-liquid separation chamber, and be communicated to the gas-entered passageway toward the firing chamber,

Above-mentioned first opening portion is formed at first wall,

Above-mentioned the 3rd opening portion is formed at second wall,

In above-mentioned gas-liquid separation chamber, between above-mentioned first opening portion and above-mentioned the 3rd opening portion, be formed with gas-liquid separate component.

2. the gas-liquid separation device of four stroke engine according to claim 1 is characterized in that, the inflow direction of the gas blowby that flows into from above-mentioned first opening portion and the outflow direction of the gas blowby that flows out from above-mentioned the 3rd opening portion form the position relation of reversing.

3. the gas-liquid separation device of four stroke engine according to claim 2, it is characterized in that, above-mentioned first opening portion is formed near the central authorities of above-mentioned first wall, above-mentioned the 3rd opening portion be formed at above-mentioned second wall last side direction position about on arbitrary position in two corners.

4. the gas-liquid separation device of four stroke engine according to claim 3 is characterized in that, above-mentioned gas-liquid separate component is for having the pad of a plurality of central through holes near in the central.

5. the gas-liquid separation device of four stroke engine according to claim 4 is characterized in that, arbitrary position in two corners is formed with above-mentioned second opening portion at the lower side of above-mentioned first wall to about the position,

On above-mentioned first wall, to surround the mode of above-mentioned first opening portion, on the position, the above-mentioned central through hole more lateral of ratio of above-mentioned pad, be formed with ditch portion,

Form duct-like lubricant oil return passage by above-mentioned ditch portion and above-mentioned pad, above-mentioned lubricant oil return passage is communicated with above-mentioned second opening portion.

6. the gas-liquid separation device of four stroke engine according to claim 5 is characterized in that, on the corner of above-mentioned pad, on the position of above-mentioned second opening portion of being formed with of above-mentioned first wall, is formed with through hole.

7. the gas-liquid separation device of four stroke engine according to claim 3 is characterized in that, above-mentioned gas-liquid separate component is the pad that is formed with through hole on the corner location of the opposition side of last side direction position and above-mentioned the 3rd opening portion formation side.

8. the gas-liquid separation device of four stroke engine according to claim 7 is characterized in that, arbitrary position in two corners is formed with above-mentioned second opening portion at the lower side of above-mentioned first wall to about the position.

9. the gas-liquid separation device of four stroke engine according to claim 8, it is characterized in that, the Power Available Shaft side of the four stroke engine about above-mentioned second opening portion is formed in two corners, the opposition side of the above-mentioned live axle about above-mentioned the 3rd opening portion is formed in two corners.

10. the gas-liquid separation device of four stroke engine according to claim 3 is characterized in that, above-mentioned gas-liquid separate component has mesh shape.

11. the gas-liquid separation device of four stroke engine according to claim 1 is characterized in that, it is relative with above-mentioned second wall that above-mentioned first wall forms.

12. the gas-liquid separation device of four stroke engine according to claim 3, it is characterized in that, above-mentioned gas-liquid separate component has near have a plurality of through holes central authorities first pad, in last side direction position and above-mentioned the 3rd opening portion position in corner that forms the opposition side of side be formed with second pad of through hole, and the net of mesh shape

Above-mentioned first pad, above-mentioned second pad and above-mentioned net from the above-mentioned first opening portion side, are the arranged in order by above-mentioned first pad, above-mentioned net and above-mentioned second pad.

13. the gas-liquid separation device of four stroke engine according to claim 3, it is characterized in that, above-mentioned gas-liquid separate component has near first pad that has a plurality of through holes central authorities, and form second pad that is formed with through hole on the position in corner of opposition side of side in last side direction position and above-mentioned the 3rd opening portion

Above-mentioned first pad and above-mentioned second pad from the above-mentioned first opening portion side, are the arranged in order by above-mentioned first pad, above-mentioned second pad.

14. the gas-liquid separation device of four stroke engine according to claim 3 is characterized in that, above-mentioned gas-liquid separate component has near first pad that has a plurality of through holes central authorities, and the net of mesh shape,

Above-mentioned first pad and above-mentioned net from the above-mentioned first opening portion side, are the arranged in order by above-mentioned first pad, above-mentioned net.

15. the gas-liquid separation device of four stroke engine according to claim 3, it is characterized in that, above-mentioned gas-liquid separate component has second pad that is formed with through hole on the position in the corner of the opposition side of last side direction position and above-mentioned the 3rd opening portion formation side, and the net of mesh shape

Above-mentioned second pad and above-mentioned net from the above-mentioned first opening portion side, are the arranged in order by above-mentioned net, above-mentioned second pad.

16. the lubricating fitting of a four stroke engine, it utilizes the pressure in the crankshaft room that the to-and-fro motion because of piston produces to change, and lubricant oil is supplied to above-mentioned crankshaft room and the gas distributing chamber that constitutes as the part of above-mentioned oily circulating path, thereby is lubricated, it is characterized in that

The put-through channel that is communicated with above-mentioned gas distributing chamber and above-mentioned crankshaft room when being provided with in above-mentioned crankshaft room to negative pressure,

The open end to above-mentioned crankshaft room inner opening of above-mentioned put-through channel, be set to its at above-mentioned piston near the opening when top dead center moves of the position top dead center, and during lower dead center moves, close near the position above-mentioned top dead center at above-mentioned piston,

Second opening portion of the described gas-liquid separation device of claim 1 is connected with above-mentioned put-through channel.

17. the lubricating fitting of a four stroke engine, it utilizes the pressure in the crankshaft room that the to-and-fro motion because of piston produces to change, and uses above-mentioned oily circulating path to make lubrication oil circulation, thereby carries out lubricated to each one, it is characterized in that,

Be communicated with when being provided with in above-mentioned crankshaft room to negative pressure and second opening portion of the described gas-liquid separation device of claim 1 and the return flow line of above-mentioned crankshaft room,

The open end to above-mentioned crankshaft room inner opening of above-mentioned return flow line, be set to its at above-mentioned piston near the opening when top dead center moves of the position top dead center, and during lower dead center moves, close near the position above-mentioned top dead center at above-mentioned piston.

18. the gas-liquid separation device of four stroke engine according to claim 5, it is characterized in that, have and make the 4th opening portion that is back to above-mentioned oily circulating path from the isolated lubricant oil of above-mentioned gas blowby, on the position in the lower side of above-mentioned first wall two corners to about the position, be formed with above-mentioned second opening portion and above-mentioned the 4th opening portion respectively.