CN102734040A - Spark ignition four-stroke engine for vehicle - Google Patents
Spark ignition four-stroke engine for vehicle Download PDFInfo
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- CN102734040A CN102734040A CN2012100866490A CN201210086649A CN102734040A CN 102734040 A CN102734040 A CN 102734040A CN 2012100866490 A CN2012100866490 A CN 2012100866490A CN 201210086649 A CN201210086649 A CN 201210086649A CN 102734040 A CN102734040 A CN 102734040A
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- camshaft
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Abstract
The invention provides a spark ignition four-stroke engine for vehicle. In the ignition four-stroke engine for vehicle, a spark plug is arranged in a cylinder cover,when the spark plug is arranged at a camshaft transmission chain room side, a tubular component for sealing can be maintained with a simple structure,an opening part (71) facing the camshaft transmission chain room (68) is arranged on the cylinder cover (24) for inserting a camshaft (48) into the cylinder cover (24),a side cover (72) closing the opening part (71) is arranged on the cylinder cover (24),the spark plug (42) is set to be penetrated through the ring path of a camshaft transmission chain (67) and be inserted into the tubular coponent (75),and two ends of the tubular coponent (75) are embedded into and support the cylinder cover (24)and a side cover (72) respectively though ringlike sealing components (76, 77)..
Description
Technical field
The present invention relates to vehicle and use spark-ignition four-stroke engine; Wherein, In engine main body, be formed with firing chamber in the face of the top of piston; This piston is connected with the bent axle with the axis that extends in the overall width direction, and cylinder head has a dome face of facing said firing chamber and a part that constitutes said engine main body, and; This cylinder head is arranged to inlet valve port and exhaust doorway at said dome face opening; In this cylinder head spark plug is installed, and intake valve and the exhaust valve that can close said inlet valve port and said exhaust doorway respectively are equipped on this cylinder head with the mode that can carry out on-off action; Camshaft constitute to drive the part of the valve actuating gear that said intake valve and said exhaust valve open and close and can rotate freely around the axis parallel with said bent axle; Between this camshaft and said bent axle, be provided with the driving mechanism in correct time that comprises annular cam shaft drive chain, in said engine main body, be formed with the camshaft chain chamber that supplies said camshaft chain to advance, this camshaft chain chamber is configured in a side of said firing chamber in the direction along the axis of said bent axle.
Background technique
When will be on having setting a plurality of spark plug to 1 firing chamber in the face of the cylinder head of the dome face of firing chamber; Because inlet valve port and exhaust doorway are at dome face opening; Thereby; Except receive can avoid with the few restriction of the remaining space of the interference on inlet valve port and exhaust doorway because need avoid and valve actuating gear between interference, so also have restriction at the installation direction of spark plug.In having the spark-ignition four-stroke engine of this restriction; Patent documentation 1 disclosed spark-ignition four-stroke engine is arranged; Wherein, Lean on camshaft chain chamber side to be configured into valve port in order to make the firing chamber produce eddy current; Lean on a side opposite with inlet valve port, promptly opposite with a said camshaft chain chamber side to dispose the exhaust doorway with respect to the center of firing chamber, a spark plug in a pair of spark plug is configured between said inlet valve port and the said exhaust doorway in a side opposite with said camshaft chain chamber, and avoids valve actuating gear and conjointly be arranged at the suction port in the cylinder head with said inlet valve port; Another spark plug is configured between exhaust doorway and the said camshaft chain chamber, and avoids conjointly being arranged at the relief opening in the said cylinder head with said exhaust doorway.
[patent documentation 1] TOHKEMY 2002-047939 communique
The configuration of said another spark plug in a pair of as stated spark plug is restricted owing to camshaft chain chamber and outlet pipe, but can consider in camshaft chain chamber side is passed the loop of camshaft chain, to dispose spark plug.At this moment, be configured in the sealing of the indoor spark plug of camshaft chain, can consider to utilize cartridge unit cylindraceous to cover spark plug, yet owing to need to keep this tube complicacy so structure becomes in order to make.
Summary of the invention
The present invention is In view of the foregoing and accomplishes, and the purpose of this invention is to provide a kind ofly when spark plug is configured in camshaft chain chamber side, can use spark-ignition four-stroke engine with the vehicle that simple structure keeps sealing the cartridge unit of usefulness.
In order to achieve the above object; Of the present invention first is characterised in that; A kind of vehicle is used spark-ignition four-stroke engine; Wherein, in engine main body, be formed with the firing chamber in the face of the top of piston, this piston is connected with the bent axle with the axis that extends in the overall width direction; Cylinder head has dome face of facing with said firing chamber and a part that constitutes said engine main body; And this cylinder head is arranged to make inlet valve port and exhaust doorway at said dome face opening, in this cylinder head, spark plug is installed, and; Intake valve and the exhaust valve that can close said inlet valve port and said exhaust doorway respectively are equipped on said cylinder head with the mode that can carry out on-off action; Camshaft constitute to drive the part of the valve actuating gear that said intake valve and said exhaust valve open and close and can rotate freely around the axis parallel with said bent axle, between this camshaft and said bent axle, is provided with the driving mechanism in correct time that comprises annular cam shaft drive chain, in said engine main body, is formed with the camshaft chain chamber that supplies said camshaft chain to advance; This camshaft chain chamber is in a side that on the direction of the axis of said bent axle, is configured in said firing chamber; To be arranged at said cylinder head with the opening portion that said camshaft chain chamber is faced for said camshaft is inserted and is installed in the said cylinder head, the side cover that is used to close this opening portion is installed on said cylinder head from the outside, and said spark plug is configured to pass in the loop of said camshaft chain; And be inserted in the cartridge unit, the two end part of this cartridge unit respectively via the annular seal parts by chimeric and be supported in said cylinder head and said side cover.
And; The present invention is on the basis of the structure of the 1st characteristic; The 2nd is characterised in that, the 1st and the 2nd spark plug is installed in said cylinder head, to the projection drawing of cylinder-bore axis plane orthogonal projection on; To respectively set one said inlet valve port and the central link on said exhaust doorway gets up to obtain straight line to said firing chamber; With this straight line is that benchmark disposes the 1st spark plug in a side opposite with said camshaft chain chamber, is benchmark with said straight line, disposes the 2nd spark plug in the loop that passes said camshaft chain in a side opposite with the 1st spark plug.
The present invention is on the basis of the structure of the 2nd characteristic; The 3rd is characterised in that, the central axis of the 2nd spark plug and said cylinder-bore axis are set to bigger at said valve actuating gear side angulation than the axis and the said cylinder-bore axis of the 1st spark plug at said valve actuating gear side angulation.
The present invention is on the basis of the structure of the 2nd or the 3rd characteristic, and the 4th is characterised in that, said engine main body constitutes with ventilation type, is being equipped with a side of the 1st spark plug, is provided with radiating fin in the outer wall of said cylinder head.
The present invention is on the basis of the structure of the 4th characteristic, and the 5th is characterised in that, is provided with radiating fin at the outer surface of said side cover.
On the basis of arbitrary structure of the present invention in the structure of the 2nd～the 5th characteristic; The 6th is characterised in that; To with the projection drawing of said cylinder-bore axis plane orthogonal projection on, the straight line that the central link on said inlet valve port and said exhaust doorway is got up is configured to the orthogonal axe with said camshaft.
In addition; On the basis of arbitrary structure of the present invention in the structure of the 2nd～the 6th characteristic; The 7th is characterised in that; Said correct time, driving mechanism was through constituting around hanging over the driving sprocket wheel that is arranged on the said bent axle said camshaft chain with the driven sprocket that is arranged on the said camshaft; Be provided with at said engine main body the part of advancing from said driving sprocket wheel to said driven sprocket in the said camshaft chain is pushed the stretcher of the application of force to a side of tensioning; The 2nd spark plug is configured to: to the projection drawing of the plane projection of the orthogonal axe of said bent axle on, in the position of pushing application of force direction (94) skew of the straight line that links up from the central axis with this bent axle and said camshaft to said stretcher, said the 2nd spark plug passes the loop of said camshaft chain.
According to the 1st characteristic of the present invention; Because will pass the interior spark plug of loop of camshaft chain is inserted in the cartridge unit; The two end part of this cartridge unit are supported on cylinder head and are installed on the side cover on the cylinder head from the outside; Thereby, although spark plug is configured to cross the camshaft chain chamber, also can avoid the indoor machine oil of camshaft chain to splash on the spark plug.And the side cover will be located at the opening portion sealing on the cylinder head with the camshaft chain chamber with facing, and opening portion is used for camshaft is inserted and is installed in the cylinder head, thereby need not be used for the special-purpose member of supporting drum parts, can reduce number of parts.And, owing between the two end part of cartridge unit and cylinder head and side cover, clamped the annular seal parts respectively, thereby can prevent reliably that machine oil from immersing in cartridge unit, can prevent more reliably that machine oil from splashing on the spark plug.
According to the 2nd characteristic of the present invention; To with the projection drawing of cylinder-bore axis plane orthogonal projection on; The central link on inlet valve port and exhaust doorway is got up to obtain straight line; With this straight line is benchmark, is disposing the 1st spark plug with camshaft chain chamber 68 opposite sides, disposes the 2nd spark plug in a side opposite with the 1st spark plug with the mode of the loop that passes camshaft chain; Thereby can the 1st and the 2nd spark plug be installed on the cylinder head in the both sides that from the both sides of cylinder head are the overall width direction on the direction of the axis of bent axle, it is easy that the maintenance of two spark plugs becomes.And, can two spark plugs be configured in distant position from relief opening, can make spark plug not be vulnerable to heat affecting.
According to the 3rd characteristic of the present invention; Because the central axis and the cylinder-bore axis of the 2nd spark plug are set to bigger at valve actuating gear side angulation than the axis and the cylinder-bore axis of the 1st spark plug at valve actuating gear side angulation; Thereby utilize through forming the camshaft chain chamber and make cylinder head bloat this situation to a side along the axis of bent axle; Compare with the 1st spark plug, the 2nd spark plug is installed on the cylinder head with lodging, can make the maintenance of the 2nd spark plug easier.
According to the 4th characteristic of the present invention, owing to be provided with radiating fin in the outer wall of cylinder head in a side that is equipped with the 1st spark plug, thereby can further reduce the heat affecting that the 1st spark plug receives.
According to the 5th characteristic of the present invention, owing to be provided with radiating fin at the outer surface of side cover, thereby can further alleviate the heat affecting that the 2nd spark plug receives.
According to the 6th characteristic of the present invention; To with the projection drawing of cylinder-bore axis plane orthogonal projection on; The straight line that the central link on inlet valve port and exhaust doorway is got up and the orthogonal axe of camshaft; Thereby; Can guarantee to be retained in the remaining space of the dome face of cylinder head in camshaft chain chamber side and a side opposite for said straight line, and can not be partial to the either side in inlet valve port and the exhaust doorway, can improve the degrees of freedom of the equipping position of the 1st and the 2nd spark plug in order to dispose the 1st and the 2nd spark plug with the camshaft chain chamber.
Have again; According to the 7th characteristic of the present invention; To with the projection drawing of the plane projection of the orthogonal axe of bent axle on, the 2nd spark plug is configured to: in the position of pushing application of force direction skew of the straight line that links up from the central axis with bent axle and camshaft to stretcher, the 2nd spark plug passes the loop of camshaft chain; Thereby can adjust the 2nd spark plug and the position of the camshaft chain that the device that is tensioned is pushed relation, thereby can confirm the position of the 2nd spark plug.
Description of drawings
Fig. 1 is the side view of the motor bike of the 1st mode of execution.
Fig. 2 is the longitudinal section along the engine main body of the 2-2 line of Fig. 1.
Fig. 3 is the sectional view along the 3-3 line of Fig. 2.
Fig. 4 is the sectional view along the 4-4 line of Fig. 2.
Fig. 5 be along the 5-5 line of Fig. 2 to view.
Fig. 6 be along the 6-6 line of Fig. 2 to view.
Fig. 7 is a side view of observing cylinder head from arrow 7 directions of Fig. 2.
Fig. 8 is the sectional view corresponding with Fig. 2 of the 2nd mode of execution.
Fig. 9 be along the 9-9 line of Fig. 8 to view.
Figure 10 is the partial enlarged drawing along arrow 10 directions of Fig. 8.
Figure 11 be along arrow 11 directions of Fig. 8 to view.
Label declaration
17,107: engine main body; 21: bent axle; 24,108: cylinder head; 26: piston; 30,74,109: radiating fin; 31,110: the firing chamber; 32,111: the dome face; 33: inlet valve port; 34: the exhaust doorway; 41: the 1 spark plugs; 42: the 2 spark plugs; 43: intake valve; 44: exhaust valve; 47: valve actuating gear; 48: camshaft; 64: correct time driving mechanism; 65: driven sprocket; 66: driving sprocket wheel; 67: camshaft chain; 68,113: the camshaft chain chamber; 71:117: opening portion; 72,118: the side cover; 75,121: cartridge unit; 76,77,122,123: the annular seal parts; 83: stretcher; 94: push application of force direction; C: cylinder-bore axis; E: motor; L1, L2: straight line; α 1, α 2, β 1, β 2: angle.
Embodiment
With reference to description of drawings mode of execution of the present invention.
With reference to Fig. 1～Fig. 7 the 1st mode of execution of the present invention is described; At first in Fig. 1; The vehicle frame F of motor bike possesses the standpipe of turning to 11 at front end; Turn to standpipe 11 to be supported with the mode that can turn at this front-wheel WF is carried out the front fork 12 that axle supports, said vehicle frame F has pivot plate 13 at the fore-and-aft direction intermediate portion, is supported for and can swings via the front end of fulcrum 15 with swing arm 14 at this pivot plate 13; This swing arm 14 is carried out axle with rearward end to trailing wheel WR and is supported buffer cell 16 after between swing arm 14 and vehicle frame F, being provided with.
And; Said trailing wheel WR is rotated by the motivational drive that motor E produced of spark-ignition four-stroke; The engine main body 17 of said motor E constitutes the ventilation type single-cylinder engine, is being disposed at lift-launch below the fuel tank on the said vehicle frame F 18 and carry on said vehicle frame F.And, be positioned at the rear portion that is supported on by bus said vehicle frame F at the rear of said fuel tank 18 with seat 19.
In Fig. 2～Fig. 4, said engine main body 17 possesses: crankcase 22, and this crankcase 22 is supported for bent axle 21 can rotate freely, and this bent axle 21 has along the axis of the overall width direction of motor bike; Cylinder block 23, this cylinder block 23 have cylinder thorax 27 and engage with said crankcase 22, and this cylinder thorax 27 makes the piston 26 that is connected with said bent axle 21 chimeric with the mode that can slide; The cylinder head 24 that engages with this cylinder block 23; And valve mechanism cover 25; This valve mechanism cover 25 engages with said cylinder head 24; Between this valve mechanism cover 25 and this cylinder head 24, form valve Transmission Room 28, said engine main body 17 is so that the axis of said cylinder thorax 27 is cylinder-bore axis C carries on vehicle frame F forward and towards the posture that tilts.
And, be respectively equipped with along the direction of cylinder-bore axis C a plurality of radiating fin 29,29..., 30, the 30... of devices spaced apart separately at the outer surface of said cylinder block 23 and said cylinder head 24.
Together with reference to Fig. 5; Between said cylinder head 24 and said cylinder block 23, be formed with firing chamber 31 in the face of the top of said piston 26; In said cylinder head 24 with dome face 32 of facing with this firing chamber 31; Be provided with inlet valve port 33 and respectively one on exhaust doorway 34 at said dome face 32 difference openings; And be provided with and link to each other with inlet valve port 33 and towards the relief opening 36 of suction port 35 leading flank opening of the said cylinder head 24 of court of the trailing flank opening of said cylinder head 24 with linking to each other with said exhaust doorway 34; Air inlet system 37 (with reference to Fig. 1) is connected with said suction port 35, and is as shown in Figure 1, comprises that the venting gas appliance 39 of the muffler 38 of the right side side that is configured in said trailing wheel WR is connected with said relief opening 36.
And; Each one on the 1st spark plug and the 2nd spark plug 42 are so that terminal surface is installed on cylinder head 24 to the mode of firing chamber 31; And the intake valve 43 that can close said inlet valve port 33 and said exhaust doorway 34 respectively is equipped on cylinder head 24 with exhaust valve 44 with the mode that can carry out on-off action; Intake valve 43 by valve spring 45 to the valve-closing direction application of force, exhaust valve 44 by valve spring 46 to the valve-closing direction application of force.
With reference to Fig. 6, taken in valve actuating gear 47 in the said valve Transmission Room 28 between said cylinder head 24 and said valve mechanism cover 25 together, valve actuating gear 47 drives said intake valve 43 and opens and closes with said exhaust valve 44.
This valve actuating gear 47 possesses: single camshaft 48, and it is configured between intake valve 43 and the exhaust valve 44 by intake valve 43 and exhaust valve 44 common lands; Air inlet side Rocker arm 49, it is folded between said intake valve 43 and the said camshaft 48; And exhaust side Rocker arm 50, it is folded between said exhaust valve 44 and the said camshaft 48.
Be formed with a pair of shaft supporting part 51a, 51b at the camshaft retainer 51 of being located at said cylinder head 24; Said a pair of shaft supporting part 51a, 51b are disposed in the position of devices spaced apart on the direction of the axis of the said camshaft 48 with axis parallel with said bent axle 21, said camshaft 48 via ball bearing 53,54 can free rotation mode being supported on these shaft supporting parts 51a, 51b.
And; The intermediate portion of said air inlet side Rocker arm 49 is configured between two shaft supporting part 51a, the 51b; And be supported for and can swing by air inlet side pitman arm shaft 55, this air inlet side pitman arm shaft 55 has the axis parallel with said camshaft 48 and is located between two shaft supporting part 51a, the 51b.End axis at this air inlet side Rocker arm 49 is supported with roller 59; This roller 59 rolls with the air inlet side cam 57 that is provided with at said camshaft 48 and contacts; The other end at air inlet side Rocker arm 49; Mode can regulate the advance and retreat position has screwed togather tappet screw 61, the rod end 43a butt of this tappet screw 61 and said intake valve 43.
The intermediate portion of said exhaust side Rocker arm 50 is configured between a pair of said shaft supporting part 51a, the 51b; And be deflated side pitman arm shaft 56 and be supported for and can swing, this exhaust side pitman arm shaft 56 has the axis parallel with said camshaft 48 and is located between two shaft supporting part 51a, the 51b.End at this exhaust side Rocker arm 50; Mode can regulate the advance and retreat position has screwed togather tappet screw 62; The rod end 44a butt of this tappet screw 62 and said exhaust valve 44; Axle is supported with roller 60 in the other end of exhaust side Rocker arm 50, and this roller 60 rolls with the exhaust side cams 58 that is provided with at said camshaft 48 and contacts.
And said air inlet side pitman arm shaft 55 and said exhaust side pitman arm shaft 56 are configured in the both sides of said camshaft 48, and the two end part of said air inlet side pitman arm shaft 55 and said exhaust side pitman arm shaft 56 are chimeric and be fixed in two shaft supporting part 51a, 51b.
The rotating power of said bent axle 21 is passed to said camshaft 48 when driving mechanism 64 decelerates to 1/2 by correct time; This, driving mechanism 64 was through constituting annular cam shaft drive chain 67 around hanging on driven sprocket 65 and the driving sprocket wheel 66 in correct time; This driven sprocket 65 is fixed on from the end of the outstanding said camshaft 48 of a pair of shaft supporting part 51a that is formed at camshaft retainer 51, a shaft supporting part 51b the 51b, and this driving sprocket wheel 66 is fixed in said bent axle 21.
Advance in order to make said camshaft chain 67; Form camshaft chain chamber 68 in said crankcase 22 in said engine main body 17, said cylinder block 23 and the said cylinder head 24, this camshaft chain chamber 68 is in a side (being the left side in this embodiment) that on the direction of the axis of said bent axle 21, is configured in said firing chamber 31.
Special concern Fig. 5; Be provided with the 1st spark plug mounting hole 69 in said cylinder head 24; To with the projection drawing of cylinder-bore axis C plane orthogonal projection on; The central link on said inlet valve port 33 and said exhaust doorway 34 is got up to obtain straight line L1, is benchmark with this straight line L1, in a side opposite with said camshaft chain chamber 68; The 1st spark plug mounting hole 69 is at dome face 32 openings of cylinder head 24, and the 1st spark plug 41 that makes terminal part face firing chamber 31 is screwed in the 1st spark plug mounting hole 69.Promptly; To with the projection drawing of cylinder-bore axis C plane orthogonal projection on, the central link on said inlet valve port 33 and said exhaust doorway 34 is got up to obtain straight line L1, be benchmark with this straight line L1; In a side opposite with said camshaft chain chamber 68; The 1st spark plug 41 is installed on cylinder head 24, in a side that is equipped with the 1st spark plug 41, is provided with a plurality of radiating fin 30,30... in the outer wall of said cylinder head 24.
And it is as shown in Figure 5; Be provided with the 2nd spark plug mounting hole 70 in said cylinder head 24, to the projection drawing of cylinder-bore axis C plane orthogonal projection on, the central link on said inlet valve port 33 and said exhaust doorway 34 is got up to obtain straight line L1; With this straight line L1 is benchmark; In a side opposite with the 1st spark plug mounting hole 69, the 2nd spark plug mounting hole 70 is benchmark at said dome face 32 openings with said straight line L1; In a side opposite with the 1st spark plug 41, the 2nd spark plug 42 that makes terminal part face firing chamber 31 is equipped on cylinder head 24 with the mode in the loop that passes said camshaft chain 67.
In addition; As shown in Figure 5; Be connected with the outlet pipe 96 that links to each other with said relief opening 36 in said cylinder head 24; But relief opening 36 forms shortlyer than suction port 35, in the upstream periphery that is the said outlet pipe 96 of double layered tubular ground covering and be fixed between an end and the said cylinder head 24 of exhaust outer tube 97 of this outlet pipe 96 and clamped liner.On the other hand; At the outstanding integratedly a pair of installation base of giving prominence to the outside from the opening end peripheral portion of said relief opening 36 99,100 that is provided with of said cylinder head 24; The plate 101 that is flush-mounted in said outlet pipe 96 with the mode from the outside and lip part 97a butt is fastened on the said installation base 99,100 by bolt 102,103; Thereby outlet pipe 96 is connected with said cylinder head 24 with the mode with said relief opening 36 connections, and said lip part 97a is located at the other end of said exhaust outer tube 97 integratedly and stretches out towards the outside.
And; At the outer side wall of said cylinder head 24, with two installation bases 99,100 in the mode that links to each other of side's one be provided with strengthening rib 104, this strengthening rib 104 has the function of radiating fin concurrently; At said exhaust outer tube 97 and outlet pipe 96, O is installed with mode near said relief opening 36
2 Sensor 105.
And, as shown in Figure 6, be configured to the orthogonal axe with said camshaft 48 at the straight line L1 that on the projection drawing that obtains with the projection of cylinder-bore axis C plane orthogonal, the central link on inlet valve port 33 and exhaust doorway 34 is got up.
Be provided with opening portion 71 in said cylinder head 24 with mode in the face of said camshaft chain chamber 68; This opening portion 71 is used for being installed on said cylinder head 24 with being supported for the said camshaft 48 that can rotate freely by two shaft supporting part 51a, 51b of cylinder head 24; As shown in Figure 7, utilize a plurality of bolts 73,73 in said cylinder head 24 ... The side cover 72 of closing said opening portion 71 is installed.And, also be provided with radiating fin 74,74 at the outer surface of side cover 72 ...
And then; As shown in Figure 2; The 2nd spark plug 42 is inserted in the cartridge unit 75; The two end part of this cartridge unit 75 are supported on said cylinder head 24 and are installed on the side cover 72 of this cylinder head 24 from the outside, the two end part of this cartridge unit 75 via annular seal parts 76,77 by chimeric and be supported in said cylinder head 24 and said side cover 72.
In cylinder head 24; Supply the chimeric embedding hole 78 in an end of said cartridge unit 75 to link to each other and be provided with coaxially, be assemblied in interior all Elastic Contact of annular seal parts 76 and said embedding hole 78 of an end periphery of cartridge unit 75 with the 2nd spark plug mounting hole 70 that the 2nd spark plug 42 is screwed togather.
And; Be provided with the lip part 75a that stretches out to the radial direction outside in the other end of said cartridge unit 75; Be provided with supported hole 79 at said side cover 72; This supported hole 79 stepped formation and have end difference 79a at intermediate portion are clipped in annular seal parts 77 between this end difference 79a and the said lip part 75a, and these annular seal parts 77 are installed on another distolateral position of leaning on this cartridge unit 75 than this lip part 75 on cartridge unit 75.And then, can the part of the spark plug cap 80 (Fig. 7) that links to each other with the 2nd spark plug 42 be inserted into the outer end of said supported hole 79.
And the said cylinder-bore axis C of the central axis of the 2nd spark plug 42 and engine main body 17 is set to bigger at the angle beta 1 of said valve actuating gear 47 sides institute shape than the axis of the 1st spark plug 41 and said cylinder-bore axis C at said valve actuating gear 47 side angulation α 1.
Special concern Fig. 4; Said bent axle 21 rotates to the direction shown in the arrow 81 with said driving sprocket wheel 66; One side in the camshaft chain 67 between driving sprocket wheel 66 and the driven sprocket 65, that transfer out to driven sprocket 65 from driving sprocket wheel 66 is the periphery and slider 82 butts of slack-side, is installed in the cylinder block 23 of engine main body 17 from the stretcher 83 of the opposition side of camshaft chain 67 and this slider 82 butts.And the side by driving sprocket wheel 66 tractions in the camshaft chain 67 between driving sprocket wheel 66 and the driven sprocket 65 is the periphery and camshaft chain guide 84 butts of advancing side.
Said slider 82 forms arc, so that the slack-side periphery sliding contact of its convex surface and camshaft chain 67, an end of leaning on bent axle 21 sides of this slider 82 is supported in crankcase 22 via pivot 85 with the mode that can rotate.Camshaft chain guide 84 is formed by rigidity and flexible synthetic resin with appropriateness and is roughly arc towards camshaft chain 67 side warpages, and the end of leaning on bent axle 21 sides of camshaft chain guide 84 is by chimeric and be supported in towards top and be arranged in the support recess 86 of crankcase 22 unlimitedly.And, be formed with supporting surface 87 in camshaft 48 sides of leaning on of camshaft chain guide 84 in the face of a side opposite with said camshaft chain 67, be located at cylinder head 24 with the butt supporting portion 88 of these supporting surface 87 butts.And; The outstanding integratedly circular projection 89 of cross section that is provided with in the intermediate portion both sides near said supporting surface 87 of camshaft chain guide 84; The mating face that engages with cylinder head 24 in cylinder block 23 is provided with location indentations 90, and this location indentations 90 supplies projection 89 chimeric and position.
Said stretcher 83 possess stretcher housing 91 cylindraceous and from the front end (left end of Fig. 4) of this stretcher housing 91 outstanding and towards projected direction by the pressing body 92 of the application of force; So that the mode that the end of pressing body 92 contacts with slider 82 is inserted into said stretcher housing 91 in the mounting hole 93 of being located at cylinder block 23, the flange 91a that has integratedly in the rear end of stretcher housing 91 is fastened onto cylinder block 23.
The part of advancing from said driving sprocket wheel 66 to said driven sprocket 65 in the said camshaft chain 67 is pushed the application of force by this stretcher 83 to pushing application of force direction 94, is tensioned thereby push the application of force by this.
On the other hand; The cartridge unit 75 that supplies the 2nd spark plug 42 to insert is configured in the loop of said camshaft chain 67 between said driving sprocket wheel 66 and said driven sprocket 65; But on the projection drawing that obtains to plane projection with the orthogonal axe of said bent axle 21; This cartridge unit 75 is configured to, and passes the loop of said camshaft chain 67 to the position of pushing 94 skews of application of force direction of said stretcher 83 at the straight line L2 (being the straight line overlapping with cylinder-bore axis C in this embodiment) that links up from the central axis with the central axis of said bent axle 21 and said camshaft 48.
Next the effect of the 1st mode of execution is described.Owing to be supported on cylinder head 24 and be installed on from the outside in the cartridge unit 75 on the side cover 72 of cylinder head 24 at two end part and be inserted with the 2nd spark plug 42 in the loop that passes camshaft chain 67 the 1st and the 2nd spark plug 41,42; So; Although the 2nd spark plug 42 is configured to cross camshaft chain chamber 68, also can avoid the machine oil in the camshaft chain chamber 68 to splash the 2nd spark plug 42.
And; Because for camshaft 48 is inserted and is installed in the cylinder head 24 and will be located at cylinder head 24 in the face of the opening portion 71 of camshaft chain chamber 68; Side cover 72 is installed on the said cylinder head 24; So that close this opening portion 71,, can reduce number of parts so need not be used for the special-purpose member of supporting drum parts 75.
And; Since the two end part of cartridge unit 75 respectively via the mode of annular seal parts 76,77 by chimeric and be supported in cylinder head 24 and side cover 72; Thereby can prevent reliably that machine oil from immersing in cartridge unit 75, can prevent more reliably that machine oil from splashing on the 2nd spark plug 42.
And; On the projection drawing that obtains with the projection of cylinder-bore axis C plane orthogonal; The central link on inlet valve port 33 and exhaust doorway 34 is got up to obtain straight line L1, is benchmark with this straight line L1, is disposing the 1st spark plug 41 with camshaft chain chamber 68 opposite sides; With said straight line L1 is benchmark; Disposing the 2nd spark plug 42 of the loop that passes camshaft chain 67 with the 1st spark plug 41 opposite sides, thereby can the 1st and the 2nd spark plug 41,42 become easy in the maintenance that the both sides that from the both sides of cylinder head 24 are the overall width direction on the direction of the axis of bent axle 21 are installed on 24, two spark plugs of cylinder head 41,42.And, can two spark plugs 41,42 be configured in distant position from relief opening 36, can make two spark plugs 41,42 not be vulnerable to heat affecting.
And; The central axis of the 2nd spark plug 42 and said cylinder-bore axis C are set to bigger at said valve actuating gear 47 side angulation β 1 than the axis and the said cylinder-bore axis C of the 1st spark plug 41 at valve actuating gear 47 side angulation α 1; Thereby; Utilization makes cylinder head 24 bloat this situation to the side along the axis of bent axle 21 through forming camshaft chain chamber 68; Compare with the 1st spark plug 41, the 2nd spark plug 42 is installed on the cylinder head 24 with lodging, can make the maintenance of the 2nd spark plug 42 easier.
And; Because engine main body 17 constitutes with ventilation type; Be provided with radiating fin 30,30... in a side that is equipped with the 1st spark plug 41 in the outer wall of said cylinder head 24; Outer surface at said side cover 72 is provided with radiating fin 74,74..., thereby can further reduce the heat affecting that the 1st and the 2nd spark plug 41,42 receives.
And; On the projection drawing that obtains with the projection of said cylinder-bore axis C plane orthogonal; The straight line L1 that the central link on said inlet valve port 33 and said exhaust doorway 34 is got up is configured to the orthogonal axe with said camshaft 48; Thereby can with respect to said straight line L1 in the camshaft chain chamber 68 sides and guarantee to be retained in the remaining space of the dome face 32 of cylinder head 24 in order to dispose the 1st and the 2nd spark plug 41,42 with camshaft chain chamber 68 opposite sides; And can not be partial to the either side in inlet valve port 33 and the exhaust doorway 34, can improve the degrees of freedom of the equipping position of the 1st and the 2nd spark plug 41,42.
And; On the projection drawing that obtains to plane projection with the orthogonal axe of bent axle 21; The 2nd spark plug 42 is configured to: in the position of pushing application of force direction 94 skews of the straight line L2 that links up from the central axis with said bent axle 21 and said camshaft 48 to stretcher; The 2nd spark plug 42 passes the loop of camshaft chain 67, thereby can adjust the position relation of the camshaft chain 67 that the 2nd spark plug 42 and the device 83 that is tensioned push, thereby can confirm the position of the 2nd spark plug 42.
With reference to Fig. 8～Figure 11 the 2nd mode of execution of the present invention is described, but is only illustrated detailed being marked with identical reference number with the corresponding part of above-mentioned the 1st mode of execution.
At first in Fig. 8, engine main body 107 possesses: crankcase 22, and this crankcase 22 is supported for bent axle 21 can rotate freely; Cylinder block 23, it engages with this crankcase 22; Cylinder head 108, it engages with this cylinder block 23; And valve mechanism cover 25, it engages with this cylinder head 108, is respectively equipped with along the direction of cylinder-bore axis C a plurality of radiating fin 29,29..., 109, the 109... of devices spaced apart separately at the outer surface of said cylinder block 23 and said cylinder head 108.
Together with reference to Fig. 9; Between said cylinder head 108 and said cylinder block 23, be formed with firing chamber 110 in the face of the top of piston 26; This piston 26 is entrenched in the mode that can be free to slide in the cylinder thorax 27 of said cylinder block 23, is formed with the dome face of facing with this firing chamber 110 111 in said cylinder head 108.
Be provided with inlet valve port 33 and respectively one on exhaust doorway 34 in said cylinder head 108 at said dome face 111 openings; And be provided with inlet valve port 33 and conjointly make the suction port 35 of opening and be communicated with said exhaust doorway 34 and towards the relief opening 36 of the leading flank opening of said cylinder head 108 at the trailing flank of said cylinder head 108; Air inlet system 37 (with reference to the 1st mode of execution) is connected with said suction port 35, and venting gas appliance 39 (with reference to the 1st mode of execution) is connected with said relief opening 36.And each one on the 1st and the 2nd spark plug 41,42 is so that terminal surface is installed on cylinder head 108 to the mode of firing chamber 110.
In the valve Transmission Room 28 that is formed between said cylinder head 108 and the said valve mechanism cover 25, taken in valve actuating gear 47, the single camshaft 48 that this valve actuating gear 47 is possessed is last with a pair of shaft supporting part 112a, the 112b that can free rotation mode be supported on the camshaft retainer 112 of being located at said cylinder head 108 and be possessed via ball bearing 53,54.The rotating power of said bent axle 21 is passed to this camshaft 48 when driving mechanism 64 decelerates to 1/2 by correct time; Advance in order to make the annular cam shaft drive chain 67 that constitutes driving mechanism part of 64 in this in correct time; Be formed with camshaft chain chamber 113 in said crankcase 22 in said engine main body 107, said cylinder block 23 and the said cylinder head 108, this camshaft chain chamber 113 is a side that on the direction of the axis of said bent axle 21, is configured in said firing chamber 110 (being the left side) in this embodiment.
To with the projection drawing of said cylinder-bore axis C plane orthogonal projection on; With respect to the central link on said inlet valve port 33 and said exhaust doorway 34 and with the straight line L1 of the orthogonal axe of said camshaft 48; In a side opposite with said camshaft chain chamber 113; Be provided with the 1st spark plug mounting hole 114 at its dome face 111 openings in said cylinder head 108, the 1st spark plug 41 that makes terminal part face said firing chamber 110 is screwed in the 1st spark plug mounting hole 114.Promptly; To with the projection drawing of cylinder-bore axis C plane orthogonal projection on, the central link on said inlet valve port 33 and said exhaust doorway 34 is got up to obtain straight line L1, be benchmark with this straight line L1; In a side opposite with said camshaft chain chamber 113; The 1st spark plug 41 is installed on cylinder head 108, in a side that is equipped with the 1st spark plug 41, is provided with a plurality of radiating fin 109,109... in the outer wall of said cylinder head 108.
And; With said straight line L1 is benchmark; In a side opposite with the 1st spark plug mounting hole 114; Being provided with the 2nd spark plug mounting hole 115 at said dome face 111 openings in said cylinder head 108, is benchmark in a side opposite with the 1st spark plug 114 with said straight line L1, and the 2nd spark plug 42 that makes terminal part face firing chamber 110 is equipped on cylinder head 108 with the mode in the loop that passes said camshaft chain 67.
With reference to Figure 10, the peripheral portion in said firing chamber 110 is formed with squish zone 116 together, and in order to form this squish zone 116, the peripheral portion of the dome face 111 of said cylinder head 108 forms the inclined-plane 111a of taper.And; To with the projection drawing of straight line L1 plane orthogonal (plane parallel) projection with the paper of Figure 10 on; The end of the 1st and the 2nd spark plug 41,42 is configured on the extending portion of said inclined-plane 111a, this straight line L1 be to the projection drawing of cylinder-bore axis C plane orthogonal projection on straight line that the central link on said inlet valve port 33 and said exhaust doorway 34 is got up.
According to the configuration of the 1st and the 2nd such spark plug 41,42, the squish zone 116 that flame is propagated into well be difficult to burn.
And; The said cylinder-bore axis C of the central axis of the 2nd spark plug 42 and engine main body 107 is set to bigger at said valve actuating gear 47 side angulation α 1 than the said cylinder-bore axis C of the central axis of the 2nd spark plug 42 in the 1st mode of execution and engine main body 17 at said valve actuating gear 47 side angulation α 2, the axis of the 1st spark plug 41 and said cylinder-bore axis C are set to bigger at said valve actuating gear 47 side angulation β 1 than the axis and the said cylinder-bore axis C of the 1st spark plug 41 in the 1st mode of execution at said valve actuating gear 47 side angulation β 2.That is, compare, the 1st and the 2nd spark plug 41,42 is more set with lodging with the 1st mode of execution; Like this; When the end with the 1st and the 2nd spark plug 41,42 is accommodated in the firing chamber 110, can make dome face 111 more shallow, can the shape of firing chamber 111 be remained dome-shaped.
And; The said cylinder-bore axis C of the central axis of the 2nd spark plug 42 and engine main body 107 at said valve actuating gear 47 side angulation α 2 and the 1st mode of execution likewise is set to bigger at said valve actuating gear 47 side angulation β 2 than the axis and the said cylinder-bore axis C of the 1st spark plug 41.
On said cylinder head 108; Mode to face with said camshaft chain chamber 113 is provided with opening portion 117; This opening portion 117 is used for said camshaft 48 is installed in the camshaft retainer 112 of said cylinder head 108; As shown in Figure 8, on said cylinder head 108, utilize a plurality of bolt 119,119... that the side cover 118 of closing said opening portion 117 is installed.And, also be provided with radiating fin 120,120... at the outer surface of side cover 118.
And then; The 2nd spark plug 42 is inserted in the cartridge unit 121; The two end part of this cartridge unit 121 are supported on said cylinder head 108 and are installed on the side cover 118 on this cylinder head 108 from the outside, the two end part of this cartridge unit 121 via annular seal parts 122,123 by chimeric and be supported on said cylinder head 108 and the said side cover 118.
In cylinder head 108; Supply the chimeric embedding hole 124 in an end of said cartridge unit 121 to link to each other and be provided with coaxially, be assemblied in annular seal parts 122 and interior all Elastic Contact of said embedding hole 124 of an end periphery of cartridge unit 121 with the 2nd spark plug mounting hole 115 that supplies the 2nd spark plug 42 to screw togather.
And; Be provided with on the axis elongation line at said embedding hole 124 the cartridge unit mounting hole 125 of configuration axis at said side cover 118, this cartridge unit mounting hole 125 makes through distolateral in it that 125a of tapped hole portion, diameter patchhole portion 125c bigger than the 125b of this embedding hole portion than the big 125b of embedding hole portion of the 125a of this tapped hole portion and diameter is continuous coaxially successively to be constituted.
On the other hand; Carve in the distolateral periphery of another of said cartridge unit 121 and to be provided with the outside thread 126 that screws togather with the said tapped hole 125a of portion; And be arranged to the said embedding hole 125b of portion chimericly at the lip part 121a that leans on the axial position in the outside to bloat than this outside thread 126, be equipped with the said hermetic unit 123 with interior all Elastic Contact of the said embedding hole 125b of portion in the periphery of this lip part 121a to the radial direction outside.
In Figure 11; The other end of said cartridge unit 121 forms shape of cross section and is orthohexagonal instrument engagement portion 121b; Through instruments such as spanner being engaged with this instrument engagement portion 121b and carrying out rotary manipulation, can said outside thread 126 be screwed in the tapped hole 125a of portion.
According to the 2nd mode of execution, also can obtain and the same effect of above-mentioned the 1st mode of execution.
More than, mode of execution of the present invention has been described, yet the present invention is not limited to above-mentioned mode of execution, can under the situation of the present invention that does not break away from claims record, carry out various design alterations.
For example, in the above-described embodiment, the situation of the spark-ignition four-stroke engine that applies the present invention to single cylinder has been described, yet the present invention also can be applied to the spark-ignition four-stroke engine of V-type multi-cylinder.
Claims (7)
1. a vehicle is used spark-ignition four-stroke engine, wherein,
In engine main body (17,107), be formed with the firing chamber (31,110) in the face of the top of piston (26), this piston (26) is connected with the bent axle (21) with the axis that extends in the overall width direction,
Cylinder head (24; 108) have and said firing chamber (31; 110) the dome face of facing (32; 111) and constitute said engine main body (17; 107) a part; And this cylinder head (24; 108) be arranged to make inlet valve port (33) and exhaust doorway (34) at said dome face (32; 111) opening; In this cylinder head (24; Spark plug (42) is installed 108); And; Intake valve (43) and the exhaust valve (44) that can close said inlet valve port (33) and said exhaust doorway (34) respectively are equipped on said cylinder head (24 with the mode that can carry out on-off action; 108)
Camshaft (48) constitute to drive a part of of valve actuating gear (47) that said intake valve (43) and said exhaust valve (44) open and close and can be around rotating freely with the parallel axis of said bent axle (21); Between this camshaft (48) and said bent axle (21), be provided with the driving mechanism in correct time (64) that comprises annular cam shaft drive chain (67)
In said engine main body (17,107), be formed with the camshaft chain chamber (68,113) that supplies said camshaft chain (67) to advance; This camshaft chain chamber (68,113) is in a side that on the direction of the axis of said bent axle (21), is configured in said firing chamber (31,110)
Said vehicle is characterised in that with spark-ignition four-stroke engine,
To be arranged at said cylinder head (24,108) with the opening portion (71,117) that said camshaft chain chamber (68,113) are faced in order said camshaft (48) to be inserted and to be installed in the said cylinder head (24,108); The side cover (72,118) that is used to close this opening portion (71,117) is installed on said cylinder head (24,108) from the outside
Said spark plug (42) is configured to pass in the loop of said camshaft chain (67), and is inserted in the cartridge unit (75,121), and the two end part of this cartridge unit (75,121) are respectively via annular seal parts (76,77; 122,123) by chimeric and be supported in said cylinder head (24,108) and said side cover (72,118).
2. vehicle according to claim 1 is used spark-ignition four-stroke engine, it is characterized in that,
The the 1st and the 2nd spark plug (41,42) is installed in said cylinder head (24,108); To with the projection drawing of cylinder-bore axis (C) plane orthogonal projection on; To respectively set one said inlet valve port (33) and the central link on said exhaust doorway (34) gets up to obtain straight line (L1) to said firing chamber (31,110); With said straight line (L1) is benchmark; Disposing the 1st spark plug (41) with the opposite side in said camshaft chain chamber (68,113), be benchmark with said straight line (L1), dispose the 2nd spark plug (42) in the loop that passes said camshaft chain (67) in a side opposite with the 1st spark plug (41).
3. vehicle according to claim 2 is used spark-ignition four-stroke engine, it is characterized in that,
The central axis of the 2nd spark plug (42) and said cylinder-bore axis (C) are set to bigger at said valve actuating gear (47) side angulation (β 1, β 2) than the axis and the said cylinder-bore axis (C) of the 1st spark plug (41) at said valve actuating gear (47) side angulation (α 1, α 2).
4. use spark-ignition four-stroke engine according to claim 2 or 3 described vehicles, it is characterized in that,
Said engine main body (17,107) constitutes with ventilation type, in a side that is equipped with the 1st spark plug (41), is provided with radiating fin (30,109) in the outer wall of said cylinder head (24,108).
5. vehicle according to claim 4 is used spark-ignition four-stroke engine, it is characterized in that,
Outer surface at said side cover (72,118) is provided with radiating fin (74,120).
6. use spark-ignition four-stroke engine according to each described vehicle in the claim 2～5, it is characterized in that,
To with the projection drawing of said cylinder-bore axis (C) plane orthogonal projection on, the straight line (L1) that the central link on said inlet valve port (33) and said exhaust doorway (34) is got up is configured to the orthogonal axe with said camshaft (48).
7. use spark-ignition four-stroke engine according to each described vehicle in the claim 2～6, it is characterized in that,
Said driving mechanism in correct time (64) is through constituting said camshaft chain (67) around the driven sprocket (66) that hangs over the driving sprocket wheel (66) that is arranged on the said bent axle (21) and be arranged on the said camshaft (48),
Be provided with at said engine main body (17) part of advancing from said driving sprocket wheel (66) to said driven sprocket (65) in the said camshaft chain (67) pushed the stretcher (83) of the application of force to a side of tensioning,
The 2nd spark plug (42) is configured to: to the projection drawing of the plane projection of the orthogonal axe of said bent axle (21) on; In the position of pushing application of force direction (94) skew of the straight line (L2) that links up from the central axis with this bent axle (21) and said camshaft (48) to said stretcher (83), said the 2nd spark plug (42) passes the loop of said camshaft chain (67).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-075429 | 2011-03-30 | ||
| JP2011075429 | 2011-03-30 | ||
| JP2012019671A JP5916092B2 (en) | 2011-03-30 | 2012-02-01 | Spark ignition 4-cycle engine for vehicles |
| JP2012-019671 | 2012-02-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102734040A true CN102734040A (en) | 2012-10-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100866490A Pending CN102734040A (en) | 2011-03-30 | 2012-03-28 | Spark ignition four-stroke engine for vehicle |
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| Country | Link |
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| CN (1) | CN102734040A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103967644A (en) * | 2013-01-28 | 2014-08-06 | 本田技研工业株式会社 | Cylidner cover used for internal combustion engine |
| CN105986947A (en) * | 2015-03-19 | 2016-10-05 | 本田技研工业株式会社 | A cylinder injection type internal combustion engine of a saddle riding type vehicle |
| CN106150688A (en) * | 2014-11-03 | 2016-11-23 | 现代自动车株式会社 | Timing transmission chain chamber unit and timing chain system |
| CN106687678A (en) * | 2014-09-29 | 2017-05-17 | 本田技研工业株式会社 | OHC-type internal combustion engine |
| CN113661318A (en) * | 2019-03-29 | 2021-11-16 | 本田技研工业株式会社 | Internal combustion engine |
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| US20100071647A1 (en) * | 2008-09-25 | 2010-03-25 | Nozomi Okada | Motorcycle engine |
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| US4534322A (en) * | 1982-09-29 | 1985-08-13 | Honda Giken Kogyo Kabushiki Kaisha | Arrangement for insertion of spark plugs in cylinder head |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967644A (en) * | 2013-01-28 | 2014-08-06 | 本田技研工业株式会社 | Cylidner cover used for internal combustion engine |
| CN103967644B (en) * | 2013-01-28 | 2018-10-09 | 本田技研工业株式会社 | Cylinder head for internal combustion engine |
| CN106687678A (en) * | 2014-09-29 | 2017-05-17 | 本田技研工业株式会社 | OHC-type internal combustion engine |
| CN106687678B (en) * | 2014-09-29 | 2019-07-30 | 本田技研工业株式会社 | OHC type internal combustion engine |
| CN106150688A (en) * | 2014-11-03 | 2016-11-23 | 现代自动车株式会社 | Timing transmission chain chamber unit and timing chain system |
| CN106150688B (en) * | 2014-11-03 | 2019-12-06 | 现代自动车株式会社 | Timing drive chain chamber unit and timing chain system |
| CN105986947A (en) * | 2015-03-19 | 2016-10-05 | 本田技研工业株式会社 | A cylinder injection type internal combustion engine of a saddle riding type vehicle |
| CN105986947B (en) * | 2015-03-19 | 2018-08-24 | 本田技研工业株式会社 | The inner cylinder jet type internal combustion engine of saddle ride type vehicle |
| CN113661318A (en) * | 2019-03-29 | 2021-11-16 | 本田技研工业株式会社 | Internal combustion engine |
| CN113661318B (en) * | 2019-03-29 | 2024-04-19 | 本田技研工业株式会社 | Internal combustion engine |
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Application publication date: 20121017 |