CN1530535A - Fuel jetter of engine - Google Patents

Abstract

To extremely facilitate evaporation treatment of lubricating oil and intermixed fuel components that may be included in excess air discharged from a relief valve, in a fuel injection device for an engine equipped with an injector for directly injecting fuel into a combustion chamber together with compressed air, a compressed air supply source for supplying the compressed air to the injector and the relief valve interposed on the way of a compressed air supplying passage joining the compressed air supply source to the injector. The excess air discharged from the relief valve 132 is introduced to a lubricated part housing chamber 48 formed inside an engine main body 11 so as to face to a lubricated part. (C)2004,JPO&NCIPI .

Description

The fuel injection system of motor

Technical field

The present invention relates to the fuel injection system of motor, this device comprises: pressurized air and fuel are directly injected to sparger in the firing chamber, pressurized air is supplied with the pressurized air supply source of this sparger and are arranged on the pressurized air that is connected this pressurized air supply source and described sparger supply with safety valve in the road.

Background technique

For example disclose a kind of fuel injection system in Patent Document 1 grade, it makes by the compressed-air actuated remainder of air pump supply sparger and discharges through safety valve.

Patent Document 1: specially permit communique No. 3159998.

In above-mentioned existing fuel injection system, the surplus air of discharging from safety valve is imported into guiding from the outlet pipe of the exhaust of motor.In the pressurized air of supplying with sparger, may contain the lubricant oil that air pump uses.And the surplus air of discharging, may contain the propellant composition of sneaking into from the sparger side from safety valve.Therefore, the surplus air of the propellant composition that may contain lubricant oil or sneak into is imported into outlet pipe when safety valve is opened, particularly after engine start soon or after motor stops, problem that handling the volatilization of these lubricant oil or propellant composition is still waiting to solve.

Summary of the invention

The present invention proposes in view of the above problems, the purpose of this invention is to provide a kind of fuel injection system of motor, the volatilization gas that it is very easy to handle the lubricant oil the surplus air of discharging from safety valve or sneaks into propellant composition.

To achieve these goals, the fuel injection system of the motor of the described invention of first aspect present invention comprises: pressurized air and fuel are directly injected to sparger in the firing chamber, pressurized air is supplied with the pressurized air supply source of this sparger and are arranged on the pressurized air that is connected this pressurized air supply source and described sparger supply with safety valve in the road.The surplus air of discharging from described safety valve is imported in the face of lubricated and is formed on lubricated retractable room in the engine body.

According to the described invention of first aspect present invention, even the propellant composition that the surplus air of discharging from safety valve contains lubricant oil or sneaks into, because the surplus air of discharging from safety valve is imported in the face of lubricated and is formed on lubricated retractable room in the engine body, so the volatilization gas that does not pay particular attention to the vent systems relevant with the surplus air of discharging from safety valve is handled, make lubricant oil or the volatilization gas processing of the propellant composition of sneaking into becomes very easy.

In addition, according to the described invention of first aspect present invention, the described safety valve of the described invention of second aspect present invention is towards described lubricated retractable room and be directly installed on the engine body.According to this structure, do not need to form drain passageway from safety valve to the surplus air lubricated the retractable room, can avoid increasing manufacturing procedure and components number.

On the basis of the described invention of second aspect present invention, the described sparger of the described invention of third aspect present invention is arranged on the cylinder head that constitutes a described engine body part, be formed on described cylinder head and be attached between the housing on this cylinder head as the valve cage of described lubricated retractable room, described safety valve is towards described valve cage and be installed on the described cylinder head.According to this structure, can realize simplifying the structure of fuel supply system.

In addition, on the basis of the described invention of third aspect present invention, the described invention of fourth aspect present invention with the cylinder block of described cylinder head combination on be provided as the compressed air pump of described pressurized air supply source, the path that constitutes at least a portion that connects the pressurized air path between this compressed air pump and described sparger is set directly on the described cylinder head, be installed to described sparger on this cylinder head near and the described safety valve that is communicated with of described path be installed on the cylinder head.According to this structure, can shorten the pressurized air feed path as possible, be reduced in the pressure loss in the pressurized air supply road, simultaneously can reduce safety valve and the pressure difference between the sparger that causes because of compressed-air actuated circulating resistance and respond slow problem, thereby the performance of motor is improved.

Description of drawings

Fig. 1 is the local vertical profile side view of motor;

Fig. 2 is the 2-2 alignment view that takes off the Fig. 1 under the housing state;

Fig. 3 is the 3-3 line sectional view of Fig. 2;

Fig. 4 is the 4-4 line sectional view of Fig. 3;

Fig. 5 is the 5-5 line sectional view of Fig. 2;

Fig. 6 is the 6-6 line sectional view of Fig. 5;

Fig. 7 is the 7-7 line sectional view of Fig. 5;

Fig. 8 is the vertical profile side view along the motor of the 8-8 line of Fig. 2;

Fig. 9 is the 9-9 line amplification view of Fig. 2.

Symbol description:

The 11-engine body; The 14-cylinder head; The 13-cylinder block; The 15-housing; The 19-firing chamber; The 25-sparger; 48-is as the valve cage of lubricated retractable room; 61-is as the compressed air pump of pressurized air supply source; 126-pressurized air is supplied with the road; The 128-path; The 132-safety valve.

Embodiment

Below, based on one embodiment of the invention explanation embodiments of the present invention shown in the drawings.

Fig. 1 to 9 illustrates one embodiment of the invention, Fig. 1 is the local vertical profile side view of motor, Fig. 2 is the 2-2 alignment view that takes off the Fig. 1 under the housing state, Fig. 3 is the 3-3 line sectional view of Fig. 2, and Fig. 4 is the 4-4 line sectional view of Fig. 3, and Fig. 5 is the 5-5 line sectional view of Fig. 2, Fig. 6 is the 6-6 line sectional view of Fig. 5, Fig. 7 is the 7-7 line sectional view of Fig. 5, and Fig. 8 is the vertical profile side view along the motor of the 8-8 line of Fig. 2, and Fig. 9 is the 9-9 line amplification view of Fig. 2.

At first with reference to Fig. 1, the engine body 11 of Overhead valve formula four-stroke water cooling type single Cylinder engine comprises: crankcase 12, the cylinder block 13 that combines with this crankcase 12, in the cylinder head 14 that combines with cylinder block 13 with described crankcase 12 opposition sides and at the housing 15 that combines with cylinder head 14 with cylinder block 13 opposition sides, this engine body so that cylinder head 14 be slightly before the long attitude in short back carry on vehicles such as motor bike.

With reference to Fig. 2 to Fig. 4, the piston 17 that is engaged in slidably in the cylinder-bore 16 is connected on the bent axle 10 by connecting rod 18 and crank pin (not shown), wherein, described cylinder-bore is set in the cylinder block 13, and described bent axle can be supported on (Fig. 1) on the crankcase 12 freely to rotate; Between cylinder block 13 and cylinder head 14, form firing chamber 19 in the face of described piston 17 tops.

On cylinder head 14, be provided with: in the firing chamber first and second of 19 the end face opening air-breathing doorways 20 and 21, common be connected with these air-breathing doorways 20,21 and the intakeport 23 of the upper side opening of cylinder head 14, in the firing chamber 19 end face opening single exhaust doorway 22 and connect this exhaust doorway 22 and at the relief opening 24 of the lower side opening of cylinder head 14.Simultaneously, be that mode on the cylinder-bore axis C is arranged on the cylinder head 14 with sparger 25 with the axis that is configured in cylinder-bore 16, wherein said sparger 25 is directly injected to pressurized air and fuel in the firing chamber 19.

On the projection drawing on the plane vertical, promptly dispose first air-breathing doorway 20 and the exhaust doorway 22 in the both sides of sparger 25 at described cylinder-bore axis C with cylinder-bore axis C; With another straight line L2 of the straight line L1 approximate vertical that is connected the first air-breathing doorway 20 and exhaust doorway 22 on, be that a side of sparger 25 disposes the second air-breathing doorway 21 at cylinder-bore axis C.And, in the position of avoiding first 20, the second air-breathing doorway 21, air-breathing doorway and exhaust doorway 22, spark plug 26 is installed on the cylinder head 14 in mode in the face of firing chamber 19.

On cylinder head 14, but the difference of setting on-off action can open and close the first and second air-breathing doors 27,28 on the first and second air-breathing doorways 20,21, but the exhaust valve that can open and close exhaust doorway 22 29 of on-off action is set simultaneously.

According to such configuration sparger 25, first and second air-breathing doorway 20,21, exhaust doorway 22 and spark plug 26, because sparger 25 is configured in the central part of firing chamber 19, so the flame travel in the firing chamber 19 can not depart from, can improve combustion efficiency, and by the first and second air-breathing doorways 20 are set, 21 can improve fills with air efficient and reduce the suction power loss, and can easily avoid and the first and second air-breathing doors 27, spark plug 26 is disposed in the interference of 28 and exhaust valves, sparger 25 configuration spark plugs 26 can be close to, thereby combustion efficiency can be improved.

The first and second air-breathing doors 27,28 are entrenched in respectively in the guide 30 that is fixed on the cylinder head 14 slidably, between each fixing baffle ring 31 of the upper end portion of the two air-breathing doors of giving prominence to from guide 30 27,28 and cylinder head 14 valve spring 32 are set.By the spring force of these valve spring 32, along the direction pressured two air-breathing doors 27,28 of closing valve.And exhaust valve 29 is engaged in the guide 33 that is fixed on the cylinder head 14 slidably, between each fixing baffle ring 34 of the upper end portion of the exhaust valve of giving prominence to from guide 33 29 and cylinder head 14 valve spring 35 is set.By the spring force of this valve spring 35, along the pressured exhaust valve 29 of direction of closing valve.

In conjunction with reference to Fig. 5 to Fig. 7, the first and second air-breathing doors 27,28 and exhaust valve 29 are opened or closed by valve gear 38, and this valve gear comprises: the camshaft 41 with suction side and exhaust side cams 39,40 and rotation; Suction side first Rocker arm 42 that shakes with the motion of described suction side cam 39; Exhaust side first Rocker arm 43 that shakes with the motion of described exhaust side cams 40; Suction side second Rocker arm 44 with a pair of pushing wrist 44a, 44b of the contact first and second air-breathing doors 27,28; Exhaust side second Rocker arm 45 with pushing wrist 45a of contact exhaust valve 29; Be arranged on the suction side push rod 46 that between suction side first and second Rocker arm 4s 2,44 swing movement of suction side first Rocker arm 42 is passed to suction side second Rocker arm 44; Be arranged on the exhaust side push rod 47 that between exhaust side first and second Rocker arm 4s 3,45 swing movement of exhaust side first Rocker arm 43 is passed to exhaust side second Rocker arm 45.

Between cylinder head 14 and housing 15, formation is as the valve cage 48 of lubricated retractable room, this chamber folding and unfolding and configuration are arranged in suction side and exhaust side second Rocker arm 44,45 and the suction side and the exhaust side push rod 46,47 of described valve gear 38, for lubricated folding and unfolding part in the valve cage 48 in valve gear 38, in housing 15, be provided with nozzle opening 36.

In crankcase 12, cylinder block 13 and the cylinder head 14 of engine body 11, in the side of cylinder-bore 16 and and cylinder-bore axis C oily return path 49 is set with extending in parallel, it makes in the lubricated valve cage 48 of folding and unfolding in valve gear 38 partly oil turn back among the food tray 12a of crankcase 12 bottoms (with reference to Fig. 1).

Camshaft 41 in the valve gear 38 is avoided the valve cage 48 between cylinder head 14 and the housing 15, and be configured on the cylinder block 13 in the mode of folding and unfolding in oily return path 49, but the two end part of camshaft 41 with axis parallel with bent axle by ball bearing 51,51 free rotaring ground supportings in cylinder block 13 with cover on 50, wherein cover 50 and be connected on the cylinder block 13, so that form the outer side surface of oily return path 49.

And in camshaft 41, being provided with the sliding contacting part that is used between suction side and exhaust side cams 39,40 and suction side first Rocker arm 42 and exhaust side first Rocker arm 43 provides the oil of lubricant oil to supply with road 37.

For half transmission of dynamic retarding with bent axle 10, folding and unfolding has first by movable sprocket 52, first driving sprocket wheel 60 (with reference to Fig. 1) and the convex annular endless chain 53 in oily return path 49, and first can not be attached on the camshaft 41 by movable sprocket 52 with relatively rotating, first driving sprocket wheel 60 can not be attached on the bent axle 10 with relatively rotating, and cam chain 53 volumes hang over first driving sprocket wheel 60 and first by on the movable sprocket 52.

Suction side has respectively from cylinder head 14 sides with exhaust side first Rocker arm 42,43 rotates the tumbler 54,55 that contacts suction side and exhaust side cams 39,40, and can joltily be bearing on suction side and exhaust side first pitman arm shaft 56,57 axis that first pitman arm shaft 56,57 has and described camshaft 41 is parallel and be arranged on cylinder block 13 and cover between 50 wherein.On these suction side and exhaust side first Rocker arm 43,43, with described tumbler 54,55 opposition sides on, in the mode of opening to cylinder head 14 sides the bowl-shape pushing 42a of portion, 43a are set integratedly respectively.

On the other hand, in valve cage 48, suction side and exhaust side second pitman arm shaft 58,59 are supported on the cylinder head 14 in the mode that is configured in described sparger 25 both sides, and described pitman arm shaft has the axis parallel with described camshaft 41; Suction side second Rocker arm 44 with a pair of pushing wrist 44a, 44b of two bursts of shape branches can freedom joltily be bearing on suction side second pitman arm shaft 58, and exhaust side second Rocker arm 45 can freedom joltily be bearing on exhaust side second pitman arm shaft 59.

And relative suction side second pitman arm shaft 58, with two pushing wrist 44a, 44b opposition side on, the bowl-shape compression zone 44c that opens towards cylinder block 13 sides is arranged on suction side second Rocker arm 44 integratedly; Relative exhaust side second pitman arm shaft 59, with pushing wrist 45a opposition side on, the bowl-shape compression zone 45b that opens towards cylinder block 13 sides is arranged on exhaust side second Rocker arm 45 integratedly.

Extend suction side and exhaust side push rod 46,47 part in from valve cage 48 to oily return path 49, one distolateral balled end of suction side and exhaust side push rod 46,47 can unsteadily be engaged among the 42a of pushing portion, the 43a of suction side and exhaust side first Rocker arm 42,43, and another distolateral balled end of suction side and exhaust side push rod 46,47 can unsteadily be engaged among compression zone 44c, the 45b of suction side and exhaust side second Rocker arm 44,45.

In this valve gear, corresponding to the rotation of bent axle with the camshaft 41 of 1/2 reduction speed ratio transmitting rotary power, by shake suction side first Rocker arm 42 by suction side cam 39, suction side push rod 46 moves along its axle direction, corresponding therewith, suction side second Rocker arm 44 shakes, thereby beat to open or close and close first and second air-breathing door 27,28, in addition, by exhaust side cams 40 exhaust side first Rocker arm 43 is shaken, exhaust side push rod 47 moves along its axle direction thus, and is corresponding therewith, exhaust side second Rocker arm 45 shakes, thereby opens or closes exhaust valve 29.

At this moment, to be supplied to sparger 25 from pressurized air as the compressed air pump 61 of pressurized air supply source, this compressed air pump 61 is to make the piston 66 edges direction parallel with cylinder-bore axis C toward the reciprocating pump of to-and-fro motion, and is being configured in the bottom of cylinder block 13 with the side that is positioned at relief opening 24 correspondences on the cylinder head 14.And on cylinder block 13, with the vertical plane of cylinder-bore axis C in form with described oily return path 49 roughly the L word shape ground mode of linking to each other be configured in working room 62 below the cylinder-bore 16, described compressed air pump 61 than oily return path 49 by under the position be configured on the joint of oily return path 49 and working room 62.

In conjunction with reference to Fig. 8, the pump case 63 of compressed air pump 61 has round-ended cylinder shape parts for being formed on the cylinder block 13, and this cylinder-like part has the axis parallel with cylinder-bore axis C and open towards cylinder head 14 sides; The cover 64 of the described cylinder head 14 side opening portions of closed this pump case 63 is connected on the cylinder block 13 airtightly.

Piston 66 is engaged in the pump case 63 slidably, forms pump chamber 65 between end of piston 66 and cover 64, and it is configured in cylinder head 14 sides, shrinks corresponding pressurized air to produce with volume; Between the dead end of the other end of piston 66 and pump case 63, form the atmospheric pressure chamber 88 that is configured in food tray 12a side.

On the other hand, bearing part 69 cylindraceous is set in working room 62, it has and the parallel axes of camshaft 41 and the axis by described piston 66, this bearing part 69 is connected to several as in four connection bump portions 70 by bolt 71 respectively, and wherein lug boss 70 is arranged on the cylinder block 13 highlightedly.In addition, the cover 72 that forms the exterior lateral sides of working room 62 connects cylinder block 13, opens connection or unclamp operation that cover can carry out described bolt 71 at 72 o'clock.

The described bearing part 69 of pump live axle 73 coaxial perforations is installed roller bearing 74 between end of bearing part 69 and pump live axle 73, between the other end of bearing part 69 and pump live axle 73 ball bearing 75 is installed.Be that pump live axle 73 is bearing on the bearing part 69 that is connected to cylinder block 13 free to rotately.

By the outstanding part in an end of described bearing part 69, transmit by power transmitting deice 89 at the power of pump live axle 73 from camshaft 41, this power transmitting deice 89 is made of following parts: be fixed to second on the pump live axle 73 by movable sprocket 78; Combine with camshaft 41 with first by movable sprocket 52 all-in-one-pieces second driving sprocket wheel 79; Volume hangs over second by the endless chain 80 on movable sprocket 78 and the driving sprocket wheel 79.

Pump live axle 73 is connected on the piston 66 of compressed air pump 61 by ending car stop piece yoke formula crank 84, end car stop piece yoke formula crank 84 front ends with eccentric shaft 73a and be connected on the slide blocks 68 that is engaged in slidably in the piston 66, wherein eccentric shaft is outstanding from the eccentric position of pump live axle 73 1 ends.And, the revolution that the power that respective drive 73 is transmitted by camshaft 41 causes, eccentric shaft 73a is around the rotational of pump live axle 73, so that the piston 66 of compressed air pump 61 increases or reduce mode to-and-fro motion vertically in pump case 63 of the volume of pump chamber 65.

Sliding eye 67 is set in piston 66, the axis in this hole be positioned at along a diameter line of piston and and the plane of the intersect vertical axis of described camshaft 41, described slide blocks 68 is entrenched in this sliding eye 67 slidably.And the outstanding integratedly end that is arranged on pump live axle 73 of eccentric shaft 73a.

The opening portion 76 of the end insertion that makes pump live axle 73 is set in pump case 63, the patchhole 77 that in piston 66, eccentric shaft 73a is inserted with the mode setting of vertical central part of leading to sliding eye 67, so that corresponding, allow that eccentric shaft 73a moves along the axial direction of sliding eye 67 with the rotation of pump live axle 73.

Central part between ball bearing 75 and roller bearing 74, in the both sides of bearing part 69 through hole 81,82 is set respectively, and with the position of a side through hole 81 correspondences, oily guide member 83 is set on bearing part 69 integratedly, and the part oil that this guide member is used for falling in the working room 62 imports between bearing part 69 and the pump live axle 73.Path 134 promptly is set on cylinder head 14, make and to guide the part oil that accumulates in bottom in the valve cage 48, and on cylinder block 13, be provided with and lead to this path 134 and the path 135 of 62 split sheds in the working room, oily in addition guide member 83 is arranged on the bearing part 69 integratedly, so that will import through hole 81 from the oil that path 135 falls.In addition, the a part of oil that is imported between bearing part 69 and the pump live axle 73 is used for lubricated roller bearing 74 and ball bearing 75, remainder drops to bottom in the working room 62 from through hole 82, therefore the oil that accumulates in 62 bottoms, working room returns food tray 12a from return path 136, and wherein path 136 is arranged on the cylinder block 13 and leads to the bottom of working room 62.

On the side opposite with respect to described bearing part 69 and compressed air pump 61, water pump 90 is installed on cylinder block 13, this pump has the spin axis coaxial with pump live axle 73, with respect to contain cylinder-bore axis C and and the vertical plane P L of pump live axle 73 in the face of the position configuration compressed air pump 61 and the water pump 90 of title.

The pump case 91 of water pump 90 is made of shell main body 92 and pump cover 93, and its mesochite main body 92 forms by the open end that the 92a of round-ended cylinder portion is arranged that the 92b of plate-like portion is arranged on integratedly closed pump live axle 73 sides, and cover 93 closes the open end of closed shell main body 92.Pump cover 93 with the open end peripheral part of shell main body 92 is seized on both sides by the arms and cylinder block 13 between mode be connected on the cylinder block 13.

Be bearing on the central part of the dead end central part of the 92a of round-ended cylinder portion and pump cover 93 with the two end part of the coaxial pump shaft 94 of pump live axle 73 free to rotately, and some magnet 96 are fixed on the rotor 95, its rotor 95 is inserted with in the 92a of round-ended cylinder portion, so that itself and described pump shaft 94 rotate integratedly.On the other hand, rotary component 97 with cylindrical part 97a is fixed on from the other end of the outstanding pump live axle 73 of the other end of bearing part 69, wherein said cylindrical part 97a coaxially around described shell main body 92 the 92a of round-ended cylinder portion arranged, and some magnet 98 is fixed on the internal surface of described cylindrical part 97a.Therefore corresponding rotation parts 97 and pump live axle 73 rotate together, and rotor 95 and pump shaft 94 rotate together.

Here, form vortex chamber 99 between shell main body 92 and pump cover 93, the impeller 100 of folding and unfolding in this vortex chamber 99 is arranged on the rotor 95.

On pump cover 93, be provided with in the vortex chamber a plurality of suction ports 101 of 97 central part upper shed, be inhaled into of the rotation pressurization of the cooling water of vortex chamber 99 from described suction port 101 by impeller 100.And supply with water jacket 102 and the cylinder head side water jacket 103 that is located at cylinder block 13 sides from the cooling water that water pump 90 is discharged, wherein, water jacket 103 leads to this cylinder block side water jacket 102 and is arranged on the cylinder head 14, and correspondingly with the temperature of cooling water between following two states, switch by thermostat, promptly the cooling water of discharging from cylinder head side water jacket 103 is imported the state that returns suction port 101 behind the state of radiator (not shown) etc. and the bypass radiator etc., the thermostat housing 105 of this thermostat 104 is formed on the pump cover 93 of described water pump 90.

Upper portion side wall at the pump case 63 of compressed air pump 61 is provided with oily introduction hole 85 with the form of leading to oily return path 49, and will the flow through part of oily return path 49 oil of this introduction hole imports and does lubricated using in the pump case 63.The suction side cam 39 of camshaft 41 and exhaust side cams 40 are by this part oil in the oily return path 49 of flowing through of kicking up of the rotation in oily return path 49, and make its separation, disperse by action of centrifugal force, and it is oily owing to action of centrifugal force is separated, dispersed to supply with a part of supplying with on road 37 from oil, thereby set the relative position of camshaft 41 and introduction hole 85, so that the oily spittle after separating is imported into oily introduction hole 85.

Here, wideer than other parts in the oil return path 49 with the width of valve gear 38 counterparts, roughly semicircle shape ground is around being arranged on the cylinder block 13 with the outstanding wall 86 of the suction side cam 39 of camshaft 41 and exhaust side cams 40 counterparts is outstanding integratedly, and relative with oily circulating direction 137 in the oily return path 49, the oily return aperture 85 of described in addition compressed air pump 61 is configured in the vertical upstream position of described outstanding wall 86 along oily circulating direction 137.Promptly outstanding wall 86 is used for flowing to the oil guiding introduction hole 85 in the oily return path 49.

Oil return aperture 85 is more to be arranged on the pump case 63 by the mode of interior all openings of the pump case 63 of atmospheric pressure chamber 88 sides than piston ring 138, wherein piston ring 138 is contained in the periphery of piston 66 and the interior week of sliding contact pump case 63, no matter the axial motion of piston 66, always oily return aperture 85 is communicated with a end of sliding eye 67 on being arranged on piston 66.In addition, periphery at piston 66 is provided with the end of atmospheric pressure chamber 88 sides that connect piston 66 and a pair of groove 139 at sliding eye 67 two ends, the a part of oil that imports pump cases 63 from oily return aperture 85 is used for the lubricated of 63 of piston 66 and pump cases, and remainder flows to atmospheric pressure chamber 88 sides through described groove 139.And because described groove 139 is discharged the oil in the sliding eye 67, so the slide blocks 68 that can prevent to end on the car stop piece yoke formula crank 84 produces pump actions.And the oil that flows to atmospheric pressure chamber 88 flows to 15 working rooms, 62 sides from opening portion 76, flows to food tray 12a side from return path 136 again.

Pay special attention to Fig. 7, sparger 25 is made of following element: air and fuel jet valve 107, and it has the nozzle 106 that is projected in the firing chamber 19 and is installed on the cylinder head 14; Combustion injection valve 108, it is connected with air and fuel jet valve 107 so that from the rear of this air and fuel jet valve 107 ejection fuel.Air burning injection valve 107 is directly injected to pressurized air and fuel in the firing chamber 19.

On cylinder head 14 and cylinder-bore axis C be provided with coaxially and make the matching hole 109 that described nozzle 106 cooperates airtightly and insert tube 110, wherein tube 110 has than this matching hole 109 big internal diameters and also is connected to coaxially on the matching hole 109.In addition, air and fuel jet valve 107 is engaged in the matching hole 109 its nozzle 106 airtightly, is inserted into simultaneously in the tube 110, and the annular stepped portion 111 by wavy spring packing ring 123 and formation between matching hole 109 and insertion tube 110 is touched.

In addition, the wire interconnecting piece 107a that air and fuel jet valve 107 is provided with at its rear portion is configured in and is arranged in the otch 110a that inserts tube 110 rear ends, the couple of conductor 112 that derives from wire interconnecting piece 107a outside inserting tube 110 connects seal ring 113 and is drawn out to the outside, and wherein seal ring 113 is clipped between the junction plane of cylinder head 14 and housing 15.

On the other hand, on housing 15, form case of sprayer 114 cylindraceous, this housing is when cooperating, keeping Fuelinjection nozzle 108, described air and fuel jet valve 107 is clamped between housing 15 and the cylinder head 14, when being attached to housing 15 on the cylinder head 14, the rear end of the front end of case of sprayer 114 and air and fuel jet valve touches.And, being connected with grip block 115 in the rear end of case of sprayer 114, this plate is clamped in the rearward end of Fuelinjection nozzle 108 between grip block 115 and the case of sprayer 114.

Between case of sprayer 114 and Fuelinjection nozzle 108, form the ring-type fuel chambers 116 of leading in the Fuelinjection nozzle 108, a pair of sealed member 117,118 of clamping this fuel chambers 116 from both sides is installed between Fuelinjection nozzle 108 and the case of sprayer 114.

In addition, the fuel supply path 119 that leads to described fuel chambers 116 is set directly in housing 15, guiding is connected to fuel supply path 119 from the flexible pipe 120 of the fuel of fuel supply source (not shown) by joint 121.

In addition, between the rearward end and case of sprayer 114 of the front end of Fuelinjection nozzle 108 and air and fuel jet valve 107, the ring-type air chamber 122 of air and fuel jet valve 107 is led in formation, supplies with this air chamber 122 from the pressurized air of described compressed air pump 61.

With reference to Fig. 2 and Fig. 8, on the cover 64 of compressed air pump 61, suction pipe 124 is set, this pipe is connected with the flexible pipe of deriving air from the air-strainer (not shown), and this suction pipe 124 is connected with pump chamber 65 by the leaf valve (not shown) that is located in the cover 64.

In addition, in described cover 64, the pressure that is built-in with corresponding pump chamber 65 increases and the poppet valve 125 opened, supplies with air supply chambers 122 126, road from the pressurized air that compressed air pump 61 is sent by described poppet valve 125 and pressurized air.

Pressurized air is supplied with road 126 and is made of following parts: pipe part 127, one end are connected on the cover 64 so that link to each other with described poppet valve 125; Path 128, it is set directly on the cylinder head 14 so that be connected to the other end of this pipe part 127; Path 129, it leads to described path 128, and is set directly on the housing 15 with the form of leading to air chamber 122.

In addition, insert in cylinder head 14 and the housing 15 across the two end part of the cylindric locating stud 130 of the junction plane of cylinder head 14 and housing 15.Constitute the part of pressurized air path 126 and be set directly at cylinder head 14 and housing 15 on path 128,129 be communicated with by described locating stud 130.And the O shape ring 133 that centers on locating stud 130 is clamped between the junction plane of cylinder head 14 and housing 15.

In addition, form throttle orifice 131 in locating stud 130, the safety valve 132 that is connected on the described path 128 of these throttle orifice 131 upstream sides is installed on the cylinder head 14.

Like this, locating stud 130 usefulness are connected the connected element of the path 129 of the path 128 of cylinder head 14 and housing 15,, can help to reduce components number so do not need to be used for the special-purpose member of connecting path.In addition owing to locating stud 130 in, form throttle orifice 131, thus the compressed-air actuated pressure of supply sparger 25 can be regulated, and do not need to be used to regulate the special-purpose member of this pressure, thus can help to reduce components number.

Described safety valve 132, in the face of the valve cage 48 that forms between cylinder head on the engine body 11 14 and housing 15 is directly installed on the cylinder head 14, and formation connects at least a portion (is a part in this embodiment) of the pressurized air path 126 of compressed air pump 61 and sparger 25, to lead to the path 128 that is set directly on the cylinder head 14, be installed on the cylinder head 14 near the sparger 25.

In Fig. 9, facing on the cylinder head 14 of valve cage 48, in the mode that is projected into described valve cage 48 sides decompression path 142 and mounting flange 144 are set integratedly, wherein path 142 leads to path 128, and flange 144 has the screw 143 that is communicated with this decompression path 142 coaxially.

The valve chest 145 of safety valve 132 has with the described decompression path 142 coaxial valve openings that link to each other 146 on inner occlusive part and is formed with the round-ended cylinder shape, between the front end of described mounting flange 144 and housing 145,, combine with tapped hole 143 screw threads by sealed member 147.In addition, on the internal surface of the inner occlusive part of valve chest 145, form and make the valve seat 148 of described valve opening 146 in the face of central part, spring 151 is arranged on valve body 149 with compressing and bears between the spring members 150, wherein valve body 149 can rest against on the described valve seat 148 and by folding and unfolding in valve chest 145, bear the outer end that spring members 150 is fixed on valve chest 145.

In addition, when the pressure of supplying with the path 128 in the road 126 when pressurized air surpasses by the value of the load on spring defined of spring 151, valve body 149 breaks away from from valve seat 148, and from the gap between surplus air process valve opening 146, valve body 149 and the valve chest 145 of path 128, and, import valve cage 48 through being arranged on the open bore 152 of bearing on the spring members 150.

The following describes this embodiment's effect, on crankcase 12, cylinder block 13 and cylinder head 14, form oily return path 49 in the side of cylinder-bore 16 in the mode that extends in parallel with cylinder-bore axis C, wherein path 49 be used for will the lubricated part of folding and unfolding in valve gear 38 valve cages 48 oil turn back to the described food tray 12a of the bottom that is formed on crankcase 12.In addition, below oily return path 49, in the pump case 63 of the compressed air pump 61 of configuration oily introduction hole 85 is set, makes it lead to oily return path 49, and the part oil of the oily return path 49 of flowing through is imported in the pump case as lubricated.

Thereby, positively imported in the oily introduction hole 85 of compressed air pump 61 owing to return the part of the oil of food tray 12a after the part of lubricated valve gear 38, so can realize lubricated reliably compressed air pump 61 by simple structure.

In addition, compare with crankcase 12 with the cylinder head 14 that forms with engine body 11 interlocks, the profile of cylinder block 13 is less, and on this cylinder block, form pump case 63, so when reducing components number, can realize the miniaturization of motor integral body, and realize the connection of oily return path 49 and oily introduction hole 85 easily, so can make simple in structure to compressed air pump 61 fuel feeding.

In addition, in oily return path 49 folding and unfolding be useful on the transmission of power of bent axle 10 give valve gear 38 camshaft 41 first by movable sprocket 52, first driving sprocket wheel 60 and cam chain 53, since with folding and unfolding first by the part of movable sprocket 52, first driving sprocket wheel 60 and cam chain 53 as oily return path 49, so can realize the miniaturization of motor and to the simplification of the structure of compressed air pump 61 fuel feeding.

In addition, camshaft 41 is configured in the oily return path 49 by folding and unfolding, and so that the oily spittle that separates by the action of centrifugal force that rotation produced of following this camshaft 41 is imported into the mode of oily introduction hole 85 sides, set the relative position of camshaft 41 and oily introduction hole 85, so camshaft 41 can be lubricated well by the oil in the oily return path 49 of flowing through, the oily spittle that disperses by the rotation of camshaft 41 imports compressed air pump 61 effectively simultaneously, thereby can lubricate compressed air pump 61 well.

Between pump live axle 73 that connects compressed air pump 61 and camshaft 41, be provided with the power transmitting deice 89 that is used for the transmission of power of camshaft 41 is given pump live axle 73, and the camshaft 41 of drive compression air pump 61 is configured in compressed air pump 61 next doors, so can make the simple in structure of power transmitting deice 89, and can realize the miniaturization of motor.

In addition, camshaft 41 is configured on the less cylinder block of profile 13, so can further help the miniaturization of motor, and can make power transmitting deice 89 compactnesses from the power of camshaft 41 to compressed air pump 61 that transmit, can improve the degrees of freedom of the gear ratio setting of compressed air pump 61 simultaneously.In addition, power transmitting deice 89 is by endless chain 80 transferring power, so regardless of the distance between camshaft 41 and the pump live axle 73, can prevent the maximization of cylinder block 13, and can reduce components number.

In addition, in cylinder block 13, be provided with highlightedly and the relative outstanding wall 36 of oily circulating direction 137 in the oily return path 49, so that the oil of bottom is imported into oily introduction hole 85 in the oily return path 49, oily introduction hole 85 can be effectively oil imported at outstanding wall 86, thereby the lubricated of compressed air pump 61 can be realized better.

Compressed air pump 61 is reciprocating type structure, can obtain higher air pressure.Live axle 73 is used to transmit the power from making piston 66 along the direction reciprocating camshaft 41 parallel with cylinder-bore axis C, it is connected with piston 66 by ending car stop piece yoke formula crank 84, so the axis of operation of compressed air pump 61 is parallel with cylinder-bore axis C, can adopt only car stop piece yoke formula crank 84 and not need connecting rod, thereby can make the motor miniaturization.

In addition, the piston 66 of compressed air pump 61 is engaged in the pump case 63 slidably, pump chamber 65 is configured in cylinder head 14 sides, so that generation and volume shrink corresponding pressurized air, atmospheric pressure chamber 88 is led to food tray 12a and is configured in food tray 12a side, and the both ends of the surface of piston 66 are to described pump chamber 65 and described atmospheric pressure chamber 88; Piston ring 138 is contained in the periphery of piston 66 and the interior week of sliding contact pump case 63, at the interior all opening of the position oil introduction hole 85 that more leans on atmospheric pressure chamber 88 sides than described piston ring 138 at pump case 63, discharge swimmingly to food tray 12a side from atmospheric pressure chamber 88 by the pump action of piston 66 so finish lubricated compressed air pump 61 later oil, thereby can make the working efficiency of compressed air pump 61 and lubricate good.

In addition, owing to containing cylinder-bore axis C and the plane P L vertical with pump live axle 73 are connected to the two end part of pump live axle 73 in the face of the position configuration that claims compressed air pump 61 and water pump 90, so can drive water pump 90 by the pump live axle 73 that is connected to compressed air pump 61, so can reduce components number and weight reduction, and can realize reducing cost by simplifying processing and assembling.In addition, can prevent that water pump 90 is outstanding from cylinder block, thereby can avoid the maximization of cylinder block 13 integral body.

In addition, water pump 90 can be configured in the cylinder block 13 of water-cooled and cylinder head 14 near, so can shorten water pipe and avoid the complicated of pipe arrangement, can reduce the pressure loss in the pipe arrangement simultaneously.

In addition, be directly injected to sparger 25 in the firing chamber 19 owing on cylinder head 14, be provided for the pressurized air that in compressed air pump 61, to obtain and fuel, so compressed air pump 61 need not be configured on the cylinder head 14, thereby can increase design freedom and realize the miniaturization of motor, and sparger 25 and pipe arrangement thereof can be arranged on the cylinder head 14.Especially, because the pump chamber 65 of compressed air pump 61 is configured on the cylinder head 14, so the distance between pump chamber 65 and the sparger 25 is shorter, be useful on pipeline structure complicated that the pressurized air that pressurized air is imported spargers 25 from compressed air pump 61 is supplied with road 126 thereby can avoid containing, and can reduce described pipeline and construct the interior pressure loss.

In addition, Fuelinjection nozzle 108 is engaged and remains in the case of sprayer 114 in the sparger 25, and this case of sprayer 114 and housing 15 form, so the periphery in cylinder head 14 needn't dispose the parts that constitute case of sprayer 114, like this when reducing components number, can avoid the complicated of the maximization of motor and its periphery structure.

In addition, be used for fuel and pressurized air are supplied with the fuel supply path 119 of case of sprayer 114 respectively and is set directly at housing 15 as the path 129 of the part of pressurized air supply passage 126, so needn't be around case of sprayer 114 configuration be used for fuel and pressurized air are supplied with respectively the pipeline etc. of case of sprayer 114, thereby can reduce components number, can avoid simultaneously the complicated of the maximization of motor and its periphery structure.

Here, camshaft 41 be configured for driving the first air-breathing door, 27, the second air-breathing door 28 that is arranged on the cylinder head 14 and exhaust valve 29 valve gear 38 a part its avoid being arranged on the cylinder block 13 between cylinder head 14 and the housing 15.Therefore, will not be configured between cylinder head 14 and the housing 15 by camshaft 41, thereby can increase the layout degrees of freedom of case of sprayer 114, and can increase the fuel supply path 119 that is set directly on the housing 15 and the layout degrees of freedom of path 129.

In addition, supply with the surplus air importing valve cage 48 that the safety valve 132 126 ways, road is discharged from being arranged on pressurized air, this valve cage 48 is formed between the cylinder head 14 and housing 15 of engine body 11 towards lubricated (being folding and unfolding part in the valve cage 48 in valve gear 38), even the propellant composition that the surplus air of discharging from safety valve 132 contains lubricant oil or sneaks into, the volatilization gas that does not also pay particular attention to the vent systems relevant with the surplus air of discharging from safety valve 132 is handled, so that the volatilization gas of the processing lubricant oil or the propellant composition of sneaking into becomes very easy.

In addition, because safety valve 132 is towards valve cage 48 and be directly installed on the cylinder head 14 of engine body 11, so do not need to form the drain passageway of the surplus air 48, thereby can avoid increasing machining period and components number from safety valve 132 to valve cage.

In addition, sparger 25 is arranged on the cylinder head 14, and safety valve 132 is towards valve cage 48 and be directly mounted on the cylinder head 14, so can realize simplifying the structure of fuel supply system.

In addition, with the cylinder block 13 of cylinder head 14 combinations on compressed air pump 61 is set, the path 128 that constitutes the part of the pressurized air path 126 that connects this compressed air pump 61 and sparger 25 is set directly on the cylinder head 14, the safety valve 132 that is communicated with described path 128 on the next door of sparger 25 is installed on the cylinder head 14, supply with road 126 so can shorten pressurized air as possible, reduce the pressure loss in the pressurized air supply road 126, simultaneously can reduce safety valve 132 and the pressure difference between the sparger 25 that causes because of compressed-air actuated circulating resistance and respond slow problem, thereby the performance of motor is improved.

Above, though described embodiments of the invention, the present invention is not limited to the foregoing description, can carry out various design modification not departing under the described situation of the present invention of claim scope.

According to first aspect present invention, do not pay particular attention to the volatilization gas of processing the vent systems relevant with the surplus air of discharging from safety valve, make the volatilization gas of the propellant composition of handling lubricant oil or sneaking into become very easy.

According to second aspect present invention, do not need to form drain passageway from safety valve to the surplus air lubricated the retractable room, can avoid increasing manufacturing procedure and components number.

According to third aspect present invention, can realize simplifying the structure of fuel supply system.

According to fourth aspect present invention, can shorten the pressurized air feed path as possible, be reduced in the pressure loss in the pressurized air supply road, simultaneously can reduce safety valve and the pressure reduction between the sparger that causes because of compressed-air actuated circulating resistance and respond slow problem, thereby the performance of motor is improved.

Claims (4)

1. the fuel injection system of a motor, it comprises: pressurized air and fuel are directly injected to sparger (25) in the firing chamber (19), pressurized air is supplied with the pressurized air supply source (61) of this sparger (25) and are arranged on the pressurized air that is connected this pressurized air supply source (61) and described sparger (25) supply with safety valve (132) in the way, road (126), it is characterized in that: the surplus air of discharging from described safety valve (132) is imported into towards lubricated and is formed on lubricated the retractable room (48) in the engine body (11).

2. fuel injection system as claimed in claim 1 is characterized in that: described safety valve (132) is towards described lubricated retractable room (48) and be directly installed on the engine body (11).

3. fuel injection system as claimed in claim 2, it is characterized in that: described sparger (25) is arranged on the cylinder head (14) that constitutes described engine body (a 11) part, in described cylinder head (14) be attached between the housing (1 5) on this cylinder head (14) and form, described safety valve (132) is towards described valve cage (48) and be directly mounted on the described cylinder head (14) as the valve cage (48) of described lubricated retractable room.

4. fuel injection system as claimed in claim 3, it is characterized in that, with the cylinder block (13) of described cylinder head (14) combination on be provided as the compressed air pump (61) of described pressurized air supply source, the path (128) of at least a portion that constitute to connect the pressurized air path (126) of this compressed air pump (61) and described sparger (25) is set directly on the described cylinder head (14), be installed to described sparger (25) on this cylinder head (14) near the described safety valve (132) that is communicated with described path (128) be installed on the cylinder head (14).

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