CN103032126B - Variable valve transmission device of internal combustion engine - Google Patents

Abstract

The invention provides a variable valve transmission device of an internal combustion engine, which can inhibit heat conduction from a cylinder cover to an actuator even though the actuator is mounted on the cylinder cover, and can ensure the layout freedom degree, and thus prevent maximization of the internal combustion engine. An actuator (45) which enables the attachment/detachment of adjacent rocker arms (31, 32) by advance and retreat of a connecting pin (42) is mounted through more than one actuator mounting parts (55f, 55b, 55d) disposed on an external surface of a side wall (51R) of a cylinder cover (4), and lubricant passage ways (P1, P2, P3) are formed near the actuator mounting parts (55f, 55b, 55d) in the side wall (51R) of the cylinder cover (4).

Description

The variable stigmatic opening transmission device of internal-combustion engine

Technical field

The present invention relates to the variable stigmatic opening transmission device of the internal-combustion engine of the action by actuator.

Background technique

Patent Document 1 discloses the variable stigmatic opening transmission device of the internal-combustion engine being made the first Aspirating valves and the second Aspirating valves interlock or releasing interlock by the solenoidal action be arranged in cylinder head.

[at first technical paper]

[patent documentation]

[patent documentation 1] Japanese Unexamined Patent Publication 2010-156237 publication

In patent documentation 1, the end winding support of the camshaft be supported in cylinder head at axle has the driven sprocket by cam chain transferring power, and is fixed with solenoid from outside on the sidewall of the cylinder head opposed with this driven sprocket and valve mechanism cover.

Solenoid becomes coaxial position at its output shaft and camshaft and is arranged between the junction plane of cylinder head and valve mechanism cover.

Although solenoid bolton is on the sidewall of cylinder head and valve mechanism cover, this sidewall just forms the outer side wall in the transmission of power space of cam chain, and the vicinity of bolt assembly department does not have any special cooling structure.

Thus, when by solenoid bolton in the bolt assembly department of the described sidewall of cylinder head and valve mechanism cover and when installing, the heat of cylinder head is not suppressedly to solenoid conduction, and solenoid self also causes heating because working, thus causes solenoid overheated.

Therefore, if arrange the cooling mechanisies such as radiating fin on the solenoid or make solenoid leave cylinder head with stow away from heat, then the degrees of freedom of layout is restricted, and internal-combustion engine can maximize.

Summary of the invention

The present invention proposes in view of the above problems, its object is to the variable stigmatic opening transmission device that a kind of internal-combustion engine is provided, even if actuator is arranged in cylinder head by it, also can suppress the heat transfer from cylinder head to actuator, and the degrees of freedom of layout can be guaranteed and prevent the maximization of internal-combustion engine.

To achieve these goals, a first aspect of the present invention provides a kind of variable stigmatic opening transmission device of internal-combustion engine, it is equipped on vehicle, make connection pin 42 adjacent one another are and carry out retreating between two rocking arms 31,32 of swinging by the driving of actuator 45, these two rocking arms 31,32 carry out driven for opening and closing to the internal combustion engine valve 21,22 be arranged in cylinder head 4

By the advance of described connection pin 42, described adjacent rocking arm 31,32 interconnected and swing integratedly, and by the retrogressing of described connection pin 42, described adjacent rocking arm 31,32 is linked by releasing and separate, the feature of the variable stigmatic opening transmission device of described internal-combustion engine is

Described actuator 45 is installed via more than one actuator assembly department 55f, 55b, the 55d arranged on the outer surface of the sidewall 51R of cylinder head 4,

Lubricating oil path P1, P2, P3 is formed near described actuator assembly department 55f, 55b, 55d in the described sidewall 51R of cylinder head 4.

A second aspect of the present invention, based on the variable stigmatic opening transmission device of the internal-combustion engine of first aspect, is characterized in that,

Bending or bending and formed near described lubricating oil path P1, P2, P3 at least one actuator assembly department 55d in multiple described actuator assembly department 55f, 55b, 55d.

A third aspect of the present invention, based on the variable stigmatic opening transmission device of the internal-combustion engine of second aspect, is characterized in that,

Also described lubricating oil path P1, P3 is formed near other actuator assembly department 55f, 55b beyond described at least one actuator assembly department 55d.

Based on the variable stigmatic opening transmission device of a fourth aspect of the present invention internal-combustion engine of either side in the first to the third aspect, it is characterized in that,

The described sidewall 51R of described cylinder head 4 is formed and is separated with the below of described actuator assembly department 55f, 55b, 55d and the spark plug assembly department 59 of spark plug 81 is installed,

Described lubricating oil path P2 is formed between described actuator assembly department 55f, 55b, 55d and described spark plug assembly department 59.

A fifth aspect of the present invention, based on the variable stigmatic opening transmission device of the internal-combustion engine of fourth aspect, is characterized in that,

Described cylinder head 4 is in roughly raised state,

Either party sidewall 51R of the left and right of cylinder head 4 forms described actuator assembly department 55f, 55b, 55d and described spark plug assembly department 59,

In cylinder head 4, upper surface along the roof 67 of firing chamber 13 is formed with front and back cooling air passways 70 that the rear cooling airflow outlet 72 from the front cooling airflow entrance 71 of front panel 51FL to rear sidewall 51B passes through, export from the branched halfway of described front and back cooling air passway 70 to forming the side cooling airflow stating the top close with described spark plug assembly department 59 of the sidewall 51R of spark plug assembly department 59 to some extent branch's cooling air passway 75 that 76a, 76b pass through

Export between 76a, 76 at the side cooling airflow of described actuator assembly department 55f, 55b, 55d and described branch cooling air passway 75 and be formed with described lubricating oil path P2.

Based on the variable stigmatic opening transmission device of a sixth aspect of the present invention internal-combustion engine of either side in the first to the 5th aspect, it is characterized in that,

Described actuator assembly department 55f, 55b, 55d are actuator installation base portion 55f, 55b, 55d of giving prominence to from the outer surface of the described sidewall 51R of described cylinder head 4 and being formed,

Described actuator installation base portion 55f, 55b, 55d between the described actuator 45 installed and the described sidewall 51R of cylinder head 4 be formed with air layer 49,

A part of described lubricating oil path P1, P2, P3 is formed along described air layer 49.

[invention effect]

The variable stigmatic opening transmission device of the internal-combustion engine related to according to a first aspect of the present invention, the actuator 45 that connection pin 42 is retreated is arranged on the actuator assembly department 55f of the sidewall 51R of cylinder head 4, 55b, on 55d, this connection pin 42 is by adjacent and carry out two rocking arms 31 swinging, 32 link, and at this actuator assembly department 55f, 55b, lubricating oil path P1 is formed near 55d, P2, P3, therefore utilize at lubricating oil path P1, P2, the lubricant oil flowed in P3, the actuator assembly department 55f of actuator 45 will be installed by heat exchange, 55b, 55d and neighbouring cooling thereof, thus the heat of cylinder head 4 can be suppressed to the conduction of actuator 45.

In addition, the heating caused by work of actuator 45 self is also cooled by lubricant oil.

Do not need on actuator 45, arrange the external cooling mechanism such as cold sink or wind guide and heat dispersion sheet, and do not need to make actuator 45 away from cylinder head 4, thus the degrees of freedom of layout can be guaranteed, prevent the maximization of internal-combustion engine 1.

The variable stigmatic opening transmission device of the internal-combustion engine related to according to a second aspect of the invention, due to described lubricating oil path P1, P2, P3 bending or bending and formed near at least one actuator assembly department 55d in multiple actuator assembly department 55f, 55b, 55d, therefore, it is possible to effectively carry out this actuator assembly department 55d and neighbouring cooling thereof, thus the heat of cylinder head 4 situation that temperature rises to the heating that actuator 45 conducts and actuator 45 self causes because working can be suppressed further.

The variable stigmatic opening transmission device of the internal-combustion engine related to according to a third aspect of the invention we, owing to being also formed with lubricating oil path P1, P3 near other actuator assembly department 55f, the 55b beyond described at least one actuator assembly department 55d, therefore, it is possible to by multiple actuator assembly department 55f, 55b, 55d and neighbouring cooling thereof, thus the situation that the heat of cylinder head 4 conducts to actuator 45 can be suppressed further.

The variable stigmatic opening transmission device of the internal-combustion engine related to according to a forth aspect of the invention, owing to being formed and described actuator assembly department 55f on the described sidewall 51R of cylinder head 4, 55b, the below of 55d is separated and installs the spark plug assembly department 59 of spark plug 81, and at actuator assembly department 55f, 55b, lubricating oil path P2 is formed between 55d and spark plug assembly department 59, the conduction of the heat that the spark plug 81 therefore installed on spark plug assembly department 59 produces is hindered by the lubricant oil flowed in lubricating oil path P2, thus can prevent at actuator assembly department 55f, 55b, the actuator 45 of the upper installation of 55d overheated.

The variable stigmatic opening transmission device of the internal-combustion engine related to according to a fifth aspect of the invention, either party the sidewall 51R of left and right of cylinder head 4 being in roughly raised state forms actuator assembly department 55f, 55b, 55d and spark plug assembly department 59, and in this cylinder head 4, upper surface along the roof 67 of firing chamber 13 forms the front and back cooling air passways 70 that the rear cooling airflow outlet 72 from the front cooling airflow entrance 71 of front panel 51FL to rear sidewall 51B is passed through, the side cooling airflow on the top close with described spark plug assembly department 59 from the branched halfway of front and back cooling air passway 70 and to the sidewall 51R being formed with spark plug assembly department 59 exports 76a, branch's cooling air passway 75 that 76b passes through, at actuator assembly department 55f, 55b, the side cooling airflow of 55d and branch's cooling air passway 75 exports 76a, lubricating oil path P2 is formed between 76b, therefore 76a is exported by branch's cooling air passway 75 from side cooling airflow, the cooling air that 76b flows through flows out towards the spark plug 81 be arranged on spark plug assembly department 59 and cools spark plug 81, and captured the heat of this spark plug 81 and the heat of the cooling air heated up to being arranged on actuator assembly department 55f, 55b, the convection current of the actuator 45 on 55d is subject at actuator assembly department 55f, 55b, 55d and side cooling airflow export 76a, the lubricant oil flowed in lubricating oil path P2 between 76b hinders, thus the overheated of actuator 45 can be prevented.

The variable stigmatic opening transmission device of the internal-combustion engine related to according to a sixth aspect of the invention, due to actuator assembly department 55f, 55b, 55d is the actuator installation base portion 55f giving prominence to from the outer surface of the sidewall 51R of cylinder head 4 and formed, 55b, 55d, at actuator installation base portion 55f, 55b, air layer 49 is formed between the actuator 45 of the upper installation of 55d and the sidewall 51R of cylinder head 4, and lubricating oil path P1, P2, a part of P3 is formed along this air layer 49, therefore by the lubricating oil path P1 in the formation along air layer 49, P2, Cylinder Heat Wall towards air layer 49 cools by the lubricant oil flowed in P3, and pass through the effect of heat insulation of this chilled wall and air layer 49, the situation that the heat of cylinder head 4 transmits to o 45 can be suppressed significantly, thus the overheated of o 45 can be prevented.

Accompanying drawing explanation

Fig. 1 is the major component longitudinal section of internal-combustion engine of the present embodiment.

Fig. 2 cuts open and the sectional view obtained along the II-II line of Fig. 1.

Fig. 3 is the stereogram of the cylinder head being provided with various component.

Fig. 4 is the plan view of the cylinder head being provided with various component.

Fig. 5 is the right side view of the cylinder head being provided with various component.

Fig. 6 is the right side view of cylinder head.

Fig. 7 is the plan view of cylinder head.

Fig. 8 cuts open and the sectional view obtained along the VIII-VIII line of Fig. 6 and Fig. 7.

[symbol description]

1 ... internal-combustion engine

4 ... cylinder head

13 ... firing chamber

20 ... valve actuating gear

21 ... first Aspirating valves

22 ... second Aspirating valves

23 ... outlet valve

31 ... first air-breathing rocking arm

32 ... second air-breathing rocking arm

40 ... variable stigmatic opening transmission device

41 ... link and remove piston

42 ... connection pin

43 ... drive link

45 ... o

46 ... housing

48 ... bolt

49 ... air layer

51 ... periphery wall

51R ... right side wall

55f, 55b, 55d ... solenoid installation base portion

56 ... circular hole

63,64,65,66 ... fastening protrusion portion

67 ... roof

68 ... substrate wall

70 ... front and back cooling air passway

71 ... front cooling airflow entrance

72 ... rear cooling airflow outlet

73 ... divide buttress

74 ... rectification rib

75 ... branch's cooling air passway

76a, 76b ... side cooling airflow outlet

81 ... spark plug

P1 ... vertical lubricating oil path

P2 ... horizontal lubricating oil path

P3 ... vertical lubricating oil path

Embodiment

Below, referring to figs. 1 through Fig. 8, the mode of execution that the present invention relates to is described.

Internal-combustion engine 1 of the present embodiment is the air-cooling type 4 stroke cycle internal combustion machine being mounted in the two-wheeled single cylinder waited on dilly, cylinder block 3 and cylinder head 4 are overlapping in turn from bottom to top to be also fastened on not shown crankcase integratedly, the top of valve mechanism cover 5 coating gas cylinder cap 4.

Cylinder block 3, cylinder head 4, valve mechanism cover 5 forwards slightly lean forward and erect upward (with reference to Fig. 1).

With reference to Fig. 1 and Fig. 2, in cylinder block 3, be provided with the cylinder liner 12 being fitted together to into by piston 11 and moving back and forth freely, cylinder head 4 with formed between cylinder block 3 end face of piston 11 towards the mode of firing chamber 13 be fastened in cylinder block 3.

And, with reference to Fig. 1 and Fig. 4, in cylinder head 4, first, second intakeport 15,16 of two, left and right is rearward extended from firing chamber 13, first, second intakeport 15,16 extends as a upstream side intakeport 14 at midway zoarium, and forwards extends a relief opening 17 from firing chamber 13.

The upstream side of the intakeport 14 in cylinder head 4 forms the air-breathing linked with the suction means 18 possessing Fuelinjection nozzle and links opening portion 14c, and forwards side to the right is outstanding for the exhaust connecting pipe portion 17c linked with outlet pipe 19 in the downstream side of relief opening 17.

Each upper wall portions of the branch's intakeport 15,16 in cylinder head 4 is chimeric integratedly valve guide 21g, 22g, supports the first Aspirating valves 21 for sliding respectively and each opening towards firing chamber 13 of the second Aspirating valves 22 to first, second intakeport 15,16 carries out opening and closing by each valve guide 21g, 22g.

In addition, the valve guide 23g that is fitted together to integratedly by the upper wall portions of the relief opening 17 in cylinder head 4 support outlet valve 23 pairs of relief openings 17 for sliding towards the opening of firing chamber 13 carry out opening and closing.

First Aspirating valves 21 and the second Aspirating valves 22 and outlet valve 23 are exerted a force upward by valve spring 21s, 22s, 23s, thus are all closed by each opening towards firing chamber 13.

Referring to figs. 1 through Fig. 4, valve actuating gear 20 is that a camshaft 25 is directed in left-right direction and be bearing in the valve actuating gear of the SOHC type internal-combustion engine in cylinder head 4 via pair of bearings 26,27 axle, pitman arm shaft 28,29 is supported with above the oblique front and back of camshaft 25, first air-breathing rocking arm 31 and the second air-breathing rocking arm 32 each other adjacent the and central authorities in left and right by the supporting of pitman arm shaft 28 axle at rear for swinging freely, the central authorities of exhaust rocker arm 33 by the supporting of pitman arm shaft 29 axle in front for swinging freely.

In first air-breathing rocking arm 31, axle is supported on the roller 31r of one end and the air inlet cam lug boss 25i Structure deformation of camshaft 25, is bolted in the tappet screw 31t of the other end and connects with the upper end of the valve rod exerted a force upward by valve spring 21s of the first Aspirating valves 21.

In second air-breathing rocking arm 32, axle is supported on the roller 32r of one end and the nose of cam 25k Structure deformation that stops of camshaft 25, is bolted in the tappet screw 32t of the other end and connects with the upper end of the valve rod exerted a force upward by valve spring 22s of the second Aspirating valves 22.

On the other hand, in exhaust rocker arm 33, axle is supported on the roller 33r of one end and the exhaust cam lug boss 25e Structure deformation of camshaft 25, is bolted in the tappet screw 33t of the other end and connects with the upper end of the valve rod exerted a force upward by valve spring 23s of outlet valve 23.

The cam peak portion (Japanese: カ system mountain) of air inlet cam lug boss 25i makes the roller 31r of the first air-breathing rocking arm 31 be moved upward at the angle of swing place of the regulation of camshaft 25 and the first air-breathing rocking arm 31 is swung, the tappet screw 31t of the other end resists valve spring 21s and presses the first Aspirating valves 21 thus, is opened by the opening towards firing chamber 13 of the first intakeport 15 in the moment of regulation.

Equally, the cam peak portion of exhaust cam lug boss 25e makes the roller 33r of exhaust rocker arm 33 be moved upward at the angle of swing place of the regulation of camshaft 25 and exhaust rocker arm 33 is swung, the tappet screw 33t of the other end resists valve spring 23s and presses pressure exhaust valve 23 thus, is opened by the opening towards firing chamber 13 of relief opening 17 in the moment of regulation.

But, stop the outer circumferential face of nose of cam 25k in roughly circumferential surface, when the roller 32r Structure deformation of one end of stop nose of cam 25k and the second air-breathing rocking arm 32, second air-breathing rocking arm 32 swings hardly, and the second Aspirating valves 22 keeps the opening towards firing chamber 13 of cut out second intakeport 16 and becomes valve closing dormant state.

But accumulate to prevent producing fuel under valve closing dormant state, the nose of cam 25k that stops has small cam peak portion at the angle of swing place identical with air inlet cam lug boss 25i, makes the second Aspirating valves 22 pole valve opening minutely.

Along the left side wall 51L of cylinder head 4 and the cam chain room 4C up/down perforation of around long rectangle formed, in the 4C of this cam chain room, the left shaft end that the bearing 26 carrying out axle supporting in the left side of comparison camshaft 25 is given prominence to the left is fitted together to driven sprocket 30, chain 24 is set up between driven sprocket 30 and the not shown driving sprocket wheel be entrenched on bent axle, the rotation of bent axle via chain 24 with 1/2nd rotational speed transmit to camshaft 25, first air-breathing rocking arm 31 and exhaust rocker arm 33 are synchronously swung with the rotation of bent axle, thus the first Aspirating valves 21 and outlet valve 23 are carried out driven for opening and closing in the required moment respectively.

It should be noted that, by following variable stigmatic opening transmission device 40 second air-breathing rocking arm 32 and the first air-breathing rocking arm 31 connected to swing integratedly time, second Aspirating valves 22 is being carried out driven for opening and closing mutually in the same time with the first Aspirating valves 21, in moment beyond this, the second Aspirating valves 22 becomes valve closing dormant state.

Below, variable stigmatic opening transmission device 40 is described.

With reference to Fig. 1 and Fig. 2, first air-breathing rocking arm 31 and the second air-breathing rocking arm about 32 adjacent one another are and by pitman arm shaft 28 axle support be swing freely, be formed with at bellying 31f, 32f of bloating upward of the bearing part of the first air-breathing rocking arm 31 and the second air-breathing rocking arm 32 the first bullport 31h and the second bullport 32h that wear abreast with pitman arm shaft 28 respectively, this first bullport 31h and the second bullport 32h is formed as the circular hole in same footpath in the mode that left and right under the valve closing state of the first Aspirating valves 21 (and second Aspirating valves 22) is connected coaxially.

It should be noted that, the first bullport 31h and the second bullport 32h is formed with diapire 31g, 32g of hollow at the opposition side in mutually opposing face.

The link of bottomed cylindrical removes sandwiched spring 41s between piston 41 and diapire 31g and along Y-axis to intercalation sliding freely in the first bullport 31h, connection pin 42 along Y-axis to intercalation sliding freely in the second bullport 32h.

Connection pin 42 comprises the cylinder body 42a that is accommodated in completely in the second bullport 32h and gives prominence to and the bar portion 42b of the hollow hole of through diapire 32g from the central authorities of the right side of cylinder body 42a, when the first bullport 31h is connected coaxially with the second bullport about 32h, the cylinder body 42a of connection pin 42 can move to the first bullport 31h.

When under the valve closing state of the first Aspirating valves 21 (and second Aspirating valves 22), the first bullport 31h is connected coaxially with the second bullport about 32h, if be not applied with external force on the bar portion 42b of connection pin 42, then as shown in Figure 2, removed piston 41 by the link that spring 41s exerts a force connection pin 42 is pressed to the right, cylinder body 42a is made to be accommodated in the second bullport 32h completely, thus make to become same plane with the left open end linking left side and the second bullport 32h removing the cylinder body 42a that piston 41 connects, therefore the first air-breathing rocking arm 31 and the second air-breathing rocking arm 32 can swing independently of each other.

But, when connection pin 42 being pressed to the left when being applied with external force on the bar portion 42b of connection pin 42, connection pin 42 is resisted the active force of spring 41s and is pressed into by link releasing piston 41, the cylinder body 42a of connection pin 42 enters and is intercalated in the first bullport 31h, and the position be positioned at across both the first bullport 31h and the second bullport 32h, the first air-breathing rocking arm 31 and the second air-breathing rocking arm 32 link via connection pin 42 and swing integratedly thus.

Further, if disappear to connection pin 42 externally applied forces, then under the effect of the active force of spring 41s, link releasing piston 41 and connection pin 42 is pressed to the right, make it retreat and be received in the second bullport 32h, can link be removed thus.

Like this, by the advance of connection pin 42, the first air-breathing rocking arm 31 and the second air-breathing rocking arm 32 link and swing integratedly, are removed the link of the first air-breathing rocking arm 31 and the second air-breathing rocking arm 32 by the retrogressing of connection pin 42.

The bearing portion carrying out axle supporting from the right-hand member of the pitman arm shaft 28 to rear is outstanding is upward formed with bar support 57, and along left and right, this bar support 57 through and being supported to slides freely drive link 43.

The plectane portion 43a that the left end of drive link 43 has been formed expanding.

The left surface of this plectane portion 43a is opposed with the bar portion 42b of the outstanding to the right of the connection pin 42 of intercalation in the second bullport 32h of the second air-breathing rocking arm 32.

Although connection pin 42 swings together with the second air-breathing rocking arm 32, the plectane portion 43a of drive link 43 has area that all the time can be opposed with the bar portion 42b of the connection pin 42 carrying out swinging in swingable scope.

Cylinder head 4 is the cast member be made up of the nonmagnetic material of aluminum alloy, as shown in Figures 3 and 4, on the periphery wall 51 of cylinder head 4, cylinder-bore axis (central axis of cylinder liner 12) direction is formed multi-disc abreast and gives prominence to and circumferentially directed and cold sink 53 that is that extend from the outer circumferential face of this periphery wall 51.

In addition, the desired area on the periphery wall 51 of cylinder head 4 is given prominence in the mode linking the cold sink 53 be arranged above and below and is formed with the vertical rib 54 almost parallel with cylinder-bore axis.

Cold sink 53 is square under the top view shown in Fig. 4, and periphery wall 51 forms five limits by five sidewalls and forms.

As shown in Figure 4, the involutory surface 52 involutory with valve mechanism cover 5 of the upper end of cylinder head 4 is in pentagon, this pentagonal involutory surface 52 is the end face of five sidewalls, and periphery wall 51 is by the left side wall 51L towards left, the right side wall 51R towards right, towards rearward rear sidewall 51B, left front sidewall 51FL to the left toward the front, these five sidewalls of right front sidewall 51FR to the right toward the front and be formed as roughly five limit tubulars thus.

Described air-breathing links opening portion 14c and gives prominence to from the lower central of the rear sidewall 51B this cylinder head 4, and described exhaust connecting pipe portion 17c gives prominence to from right front sidewall 51FR.

Further, in the part not arranging cold sink 53 of the top substantial middle of the right side wall 51R of cylinder head 4, the o 45 as actuator driven variable stigmatic opening transmission device 40 is installed from outside.

With reference to right side view and Fig. 5 of cylinder head 4, on the outer surface that cold sink 53 is not set on the top of the right side wall 51R of cylinder head 4, solenoid installation base portion 55f, 55b is formed with in front and back along involutory surface 52, and the below between solenoid installation base portion 55f, 55b is formed with solenoid installation base portion 55d, these three solenoid installation base portion 55f, 55b, 55d respectively with tapped hole slightly give prominence to from the outer surface of right side wall 51R and are formed.

Be equipped with for the through circular hole 56 of the plunger 45p of o 45 in the substantial middle between solenoid installation base portion 55f, 55b of front and back.

The circular hole 56 of this right side wall 51R to separate and drive link 43 the outstanding described bar support 57 formed is coaxial from right side wall 51R with through being supported on.

On the other hand, in o 45, mounting flange portion 46f forwards, backwards along the open end of bottomed cylindrical housing 46 extends and is formed in these three directions lower, and each mounting hole of end of mounting flange portion 46f extended to these three directions is corresponding with the tapped hole of three solenoid installation base portions 55f, 55b, 55d of the right side wall 51R of cylinder head 4.

Therefore, the plunger 45p of o 45 is inserted in circular hole 56, and the end of the mounting flange portion 46f extended to three directions of housing 46 is offseted with solenoid installation base portion 55f, 55b, 55d of the right side wall 51R of cylinder head 4 respectively simultaneously, make each mounting hole of bolt 48 through mounting flange portion 46f and be bolted in each tapped hole of solenoid installation base portion 55f, 55b, 55d, thus o 45 is arranged on the right side wall 51R of cylinder head 4.

Because solenoid installation base portion 55f, 55b, 55d of Motionless electromagnetic solenoid 45 are slightly outstanding from the outer surface of right side wall 51R, therefore between right side wall 51R and o 45, form space, between cylinder head 4 and o 45, accompany air layer 49.

It should be noted that there is vibration-damped component 47 at the end winding support of the plunger 45p of through circular hole 56.

Like this, when on right side wall 51R o 45 being installed to cylinder head 4, as shown in Figure 2, o 45 the through circular hole of plunger 45p 56 outstanding to the left and via vibration-damped component 47 be positioned at coaxial on the right side of drive link 43 connect.

Fig. 2 illustrates under o 45 is in erasing state, connection pin 42 retreats and removes the state of the link of the first air-breathing rocking arm 31 and the second air-breathing rocking arm 32, under this link relieving state, by the rotation of camshaft 25, the the first air-breathing rocking arm 31 connected with air inlet cam lug boss 25i carries out swinging and carries out driven for opening and closing to the first Aspirating valves 21, but the second air-breathing rocking arm 32 connected with the nose of cam 25k that stops swings hardly, the second Aspirating valves 22 is made to become valve closing dormant state.

Variable stigmatic opening transmission device 40 becomes link relieving state when the low-speed running of internal-combustion engine 1, thus makes the second Aspirating valves 22 become valve closing dormant state, and only carries out driven for opening and closing to the first Aspirating valves 21.

When carrying out excitation to o 45, plunger 45p is outstanding and pressed to the left by drive link 43 via vibration-damped component 47, the connection pin 42 abutted with plectane portion 43a presses by drive link 43 to the left, when the first bullport 31h of the first air-breathing rocking arm 31 and the second air-breathing rocking arm 32 is in coaxial with the second bullport 32h, connection pin 42 to the left before so that the first air-breathing rocking arm 31 and the second air-breathing rocking arm 32 are linked.

When the first air-breathing rocking arm 31 connected with air inlet cam lug boss 25i when the rotation by camshaft 25 swings, the the second air-breathing rocking arm 32 linked via connection pin 42 also swings integratedly, thus carries out driven for opening and closing to the second Aspirating valves 22 together with the first Aspirating valves 21.

Variable stigmatic opening transmission device 40 carries out excitation to o 45 when the running up of internal-combustion engine 1 and becomes connecting state, thus carries out driven for opening and closing to the first Aspirating valves 21 and the second Aspirating valves 22 simultaneously.

The plunger 45p of o 45 does not directly connect with the connection pin 42 carrying out swinging, and connect with the drive link 43 be clipped in the middle, therefore, because the power of the bending direction produced with connection pin 42 sliding contact carrying out swinging can not impact plunger 45p and o 45.

In addition, when making o 45 demagnetization, under the effect of the active force of spring 41s, make connection pin 42 retreat quickly, thus make to move to the right with the drive link 43 of bar portion 42b sliding contact, but owing to being folded with vibration-damped component 47 between drive link 43 and plunger 45p, therefore, it is possible to suppress the generation of the action sound between drive link 43 and plunger 45p.

Then, the structure of cylinder head 4 is described in detail.

As mentioned above, cylinder head 4 forms periphery wall 51 by left side wall 51L, right side wall 51R, rear sidewall 51B, left front sidewall 51FL, these five sidewalls of right front sidewall 51FR.

On the right side wall 51R installing described o 45, solenoid installation base portion 55f, 55b, 55d periphery on top does not arrange cold sink 53, and the below of the first two solenoid installation base portion 55f, 55d does not arrange cold sink 53 yet, caving in the inside and form recess 58 in the bottom not arranging cold sink 53, is formed with the spark plug installation base portion 59 (with reference to Fig. 2, Fig. 6) of spark plug 81 at the lower surface of this recess 58.

Spark plug 81 and tapped hole 59h screw togather, and make front termination electrode outstanding and be installed in spark plug installation base portion 59 in firing chamber 13.

Spark plug 81 is projecting to oblique upper right from spark plug installation base portion 59, is positioned at the right (with reference to Fig. 2) of recess 58.

As shown in Figure 3, in the bottom of adjacent right front sidewall 51FR of right side wall 51R of installing this spark plug 81 and o 45, be vented connecting pipe portion 17c as described above forwards to give prominence to side to the right, the part to the right of the outstanding adjacent bottom portions of the exhaust connecting pipe portion 17c of this right front sidewall 51FR and the bottom of adjacent left front sidewall 51FL does not arrange cold sink 53, caves in and form recess 60 in front end to the inside in the bottom not arranging the left front sidewall 51FL of cold sink 53 with attenuating.

The Sensor mounting boss portion 61 (with reference to Fig. 7) of oxygen concentration sensor 82 is formed bloating to oblique upper left side from the right front sidewall 51FR exhaust connecting pipe portion 17c that forwards side to the right is given prominence to.

Oxygen concentration sensor 82 is embedded in the circular hole in Sensor mounting boss portion 61 with fore-end the mode making the detection unit of front end be positioned at the inside of exhaust connecting pipe portion 17c and installs.

Oxygen concentration sensor 82 is projecting to oblique upper left side from Sensor mounting boss portion 61.

Namely, when be vented connecting pipe portion 17c by left and right half-and-half segmentation split surrounding wall portion form time, oxygen concentration sensor 82 be arranged in exhaust connecting pipe portion 17c become opposition side (left side) with the o 45 being installed on right side wall 51R split in surrounding wall portion, configure away from o 45 as far as possible.

With reference to Fig. 3 and Fig. 4, the front-end and back-end of the bearing wall 62 of the right side setting setting of the cam chain room 4C arranged at the left side wall 51L along cylinder head 4 are formed with fastening protrusion portion 63,64, and this fastening protrusion portion 63,64 is formed in the mode being vertically through with bolt hole 63h, 64h.

Right between fastening protrusion portion 63 relief opening 17 is clipped in of front side, fastening protrusion portion 65 is formed in the mode being vertically through with bolt hole 65h, and the right between the fastening protrusion portion 64 of rear side first, second intakeport 15,16 is clipped in, fastening protrusion portion 66 is formed (with reference to Fig. 4) in the mode being vertically through with bolt hole 66h.

The upper-end surface in the fastening protrusion portion 65,66 of the front and back on right side becomes the involutory surface 52 involutory with valve mechanism cover 5.

Stud bolt (not shown) is run through in bolt hole 63h, 64h, 65h, the 66h in four fastening protrusion portions 63,64,65,66 and crankcase, cylinder block 3 and cylinder head 4 is tightened to one.

Cylinder head 4 is formed with cooling air passway 70,75 between the roof 67 and the substrate wall 68 above it of firing chamber 13, this substrate wall 68 is erect and is provided with (with reference to Fig. 2) such as the bearing portions that valve actuating gear 20 supports.

Cut open along the VIII-VIII line between roof 67 and substrate wall 68 and the sectional view obtained in the right side view of the cylinder head 4 at Fig. 6 and Fig. 7 shown in Figure 8 and plan view.

With reference to Fig. 8, erect on the right side of cam chain room 4C between the fastening protrusion portion 63 of the front end of the bearing wall 62 arranged and relief opening 17 and offer front cooling airflow entrance 71, between the fastening protrusion portion 64 and the first intakeport 15 of the rear end of bearing wall 62, offer rear cooling airflow export 72, front and back cooling air passway 70 is formed into rear cooling airflow outlet 72 from front cooling airflow entrance 71 along bearing wall 62.

Front cooling airflow entrance 71 is formed in the inboard of recess 60, the inside front ends of this recess 60 front panel 51FL bottom left caves in attenuating, thus is guided by the recess 60 caved in front end with attenuating from the traveling wind in front and enter into front cooling airflow entrance 71.

It should be noted that, rear cooling airflow outlet 72 is also formed in the inboard of the recess 69 of rear sidewall 51B bottom.

Be formed between first, second intakeport 15,16 and relief opening 17 by branch's cooling air passway 75 of buttress 73 from the branched halfway of front and back cooling air passway 70 towards right that divide of the plagioclase bar formed in the central authorities of front and back cooling air passway 70.

It should be noted that, a point buttress 73 also has the path collaborated to branch's cooling air passway 75 between itself and the first intakeport 15.

In addition, branch's cooling air passway 75 is divided into two and be rectified by the rectification rib 74 that left and right is long, thus forms side cooling airflow outlet 76a, the 76b of the recess 58 by right side wall 51R bottom.

Especially side cooling airflow outlet 76a opposed with the spark plug 81 be arranged in spark plug installation base portion 59 (with reference to Fig. 2).

Therefore, from front traveling wind by the recess 60 of the left front sidewall 51FL of cylinder head 4 forwards cooling airflow entrance 71 import, and by conveying in front and back cooling air passway 70 by the rear cooling airflow outlet 72 of rear sidewall 51B, and be branched rib 73 to carry in branch's cooling air passway 75 from branched halfway, thus by the outlet of side cooling airflow 76a, 76b of right side wall 51R, thus can effectively to formed the roof 67 of firing chamber 13 and first, second intakeport 15,16, relief opening 17 cools.

Further, because the side cooling airflow outlet 76a of branch's cooling air passway 75 is opposed with spark plug 81, the cooling air therefore flowed out in side cooling airflow outlet 76a can cool spark plug 81 effectively.

Then, the lubrication system in cylinder head 4 is described.

In bolt hole 63h, 64h, 65h, the 66h in the fastening protrusion portion 63,64,65,66 that stud bolt cylinder head 4 be fastened to together with cylinder block on crankcase is through, the bolt hole 66h being positioned at the rear side of right side wall 51R uses as guiding the vertical lubricating oil path P1 of lubricant oil from cylinder block side to valve actuating gear 20.

Under observation is looked on the right side shown in Fig. 6, the vertical lubricating oil path P1 of the right side wall 51R up/down perforation of this cylinder head 4 is being given prominence between the solenoid installation base portion 55b of the rear side be formed in the outer surface of upper of right side wall 51R and the solenoid installation base portion 55d of downside along downward-extension on the solenoid installation base portion 55b of rear side.

Further, the horizontal lubricating oil path P2 that this vertical lubricating oil path P1 extends in At The Height and the front and back of the camshaft 25 of right side wall 51R reports to the leadship after accomplishing a task, and the obturations such as the fastened nut of upper end open.

Under observation is looked on the right side shown in Fig. 6, horizontal lubricating oil path P2 substantially horizontally extends along the bottom of the solenoid installation base portion 55d of downside.

The open rearward end tegmentum component of horizontal lubricating oil path P2 is inaccessible, and the front end of horizontal lubricating oil path P2 is to the bearing recess 51p opening right-hand member of camshaft 25 being carried out to axle supporting.

The right-hand member of camshaft 25 in bearing recess 51p, is formed in the opening surface of oil circuit 25p in the axle in camshaft 25 to bearing recess 51p (with reference to Fig. 2) via bearing 28 intercalation.

Vertical lubricating oil path P3 extends upward from bearing recess 51p, and the upper end of vertical lubricating oil path P3 is to involutory surface 52 opening (with reference to Fig. 3).

Under observation is looked on the right side shown in Fig. 6, vertical lubricating oil path P3 extends upward between the solenoid installation base portion 55f and circular hole 56 of front side.

Therefore, flow in horizontal lubricating oil path P2 in midway forwards bending doubling as the lubricant oil that rises in the bolt hole 66h of vertical lubricating oil path P1, until bearing recess 51p, and rise among vertical lubricating oil path P3 from bearing recess 51p and enter in the lubricating oil path of valve mechanism cover 5, and then scatter from the end face of valve mechanism cover 5 to valve actuating gear 20.

In addition, the camming surface of lubricant oil to nose of cam 25i, 25k, 25e of camshaft 25 shunted from bearing recess 51p to oil circuit 25p in the axle in camshaft 25 lubricates.

In the variable stigmatic opening transmission device 40 of internal-combustion engine 1 such above, the o 45 that connection pin 42 is retreated is arranged on the solenoid installation base portion 55f of the right side wall 51R of cylinder head 4, 55b, on 55d, this connection pin 42 is by adjacent and carry out two the first rocking arms 31 swinging and the second rocking arm 32 links, and at these solenoid installation bases portion 55f, 55b, the vertical lubricating oil path P1 of neighbouring formation of 55d, horizontal lubricating oil path P2, vertical lubricating oil path P3, therefore pass through at vertical lubricating oil path P1, horizontal lubricating oil path P2, the lubricant oil flowed in vertical lubricating oil path P3 is to cool solenoid installation base portion 55f, 55b, 55d and near, thus the heat of cylinder head 4 can be suppressed to rise to the temperature caused by the conduction of o 45 and the heating of o 45 self.

Thus, do not need on o 45, arrange the cooling mechanism such as cold sink or wind guide and heat dispersion sheet, and do not need to make o 45 away from cylinder head 4, the degrees of freedom of layout can be guaranteed, and prevent the maximization of internal-combustion engine 1.

Bending is enclosed in and position near the horizontal lubricating oil path P2 formed and vertical lubricating oil path P3 because the solenoid installation base portion 55d of downside is positioned at, therefore, it is possible to effectively carry out solenoid installation base portion 55d and neighbouring cooling thereof, the situation that the heat of cylinder head 4 conducts to o 45 can be suppressed further.

The solenoid installation base portion 55f of front side is positioned near vertical lubricating oil path P3, the solenoid installation base portion 55b of rear side is positioned near vertical lubricating oil path P1, thus effectively can carry out solenoid installation base portion 55f, 55b of front and back and neighbouring cooling thereof, the situation that the heat of cylinder head 4 conducts to o 45 can be suppressed further.

The right side wall 51R of cylinder head 4 is formed and is separated with the below of solenoid installation base portion 55f, 55b, 55d and the spark plug installation base portion 59 of spark plug 81 is installed, horizontal lubricating oil path P2 is formed between solenoid installation base portion 55f, 55b, 55d and spark plug installation base portion 59, the conduction of the heat that the spark plug 81 therefore installed in spark plug installation base portion 59 produces is hindered by the lubricant oil flowed in horizontal lubricating oil path P2, thus can prevent the overheated of the o 45 installed on solenoid installation base portion 55f, 55b, 55d.

Owing to being formed with solenoid installation base portion 55f on the right side wall 51R of cylinder head 4 being in roughly raised state, 55b, 55d and spark plug installation base portion 59, on the other hand, in this cylinder head 4, upper surface along the roof 67 of firing chamber 13 forms the front and back cooling air passways 70 that the rear cooling airflow outlet 72 from the front cooling airflow entrance 71 of the left front sidewall 51FL of front side to rear sidewall 51B is passed through, the side cooling airflow on the top close with spark plug installation base portion 59 from the branched halfway of front and back cooling air passway 70 and to the right side wall 51R being formed with spark plug installation base portion 59 exports 76a, branch's cooling air passway 75 that 76b passes through, and at solenoid installation base portion 55f, 55b, the side cooling airflow of 55d and branch's cooling air passway 75 exports 76a, horizontal lubricating oil path P2 is formed between 76b, therefore 76a is exported by branch's cooling air passway 75 from side cooling airflow, the cooling air that 76b flows through flows out towards the spark plug 81 be arranged in spark plug installation base portion 59 and cools spark plug 81, and captured the heat of this spark plug 81 and the heat of the cooling air heated up to being arranged on solenoid installation base portion 55f, 55b, the convection current of the o 45 on 55d is subject at solenoid installation base portion 55f, 55b, 55d and side cooling airflow export 76a, the lubricant oil flowed in lubricating oil path P2 between 76b hinders, thus the overheated of o 45 can be prevented.

Due to solenoid installation base portion 55f, 55b, 55d gives prominence to from the outer surface of the right side wall 51R of cylinder head 4 and is formed, at solenoid installation base portion 55f, 55b, air layer 49 is formed between the actuator 45 of the upper installation of 55d and the right side wall 51R of cylinder head 4, and lubricating oil path P1, P2, a part of P3 is formed along this air layer 49, therefore by the lubricating oil path P1 in the formation along air layer 49, P2, Cylinder Heat Wall towards air layer 49 cools by the lubricant oil flowed in P3, and pass through the effect of heat insulation of this chilled wall and air layer 49, the situation that the heat of cylinder head 4 transmits to o 45 can be suppressed significantly, thus the overheated of o 45 can be prevented.

Claims (4)

1. the variable stigmatic opening transmission device of an internal-combustion engine, it is equipped on vehicle, make connection pin (42) adjacent one another are and carry out retreating between two rocking arms (31,32) of swinging by the driving of actuator (45), these two rocking arms (31,32) carry out driven for opening and closing to the internal combustion engine valve be arranged in cylinder head (4) (21,22)

By the advance of described connection pin (42), described adjacent rocking arm (31,32) is interconnected and swing integratedly, and by the retrogressing of described connection pin (42), described adjacent rocking arm (31,32) is separate by releasing link, the feature of the variable stigmatic opening transmission device of described internal-combustion engine is

Described actuator (45) is installed via the more than one actuator assembly department (55f, 55b, 55d) arranged on the outer surface of the sidewall (51R) of cylinder head (4),

Lubricating oil path (P1, P2, P3) is formed near described actuator assembly department (55f, 55b, 55d) in the described sidewall (51R) of cylinder head (4),

The described sidewall (51R) of described cylinder head (4) is formed and is separated with the below of described actuator assembly department (55f, 55b, 55d) and the spark plug assembly department (59) of spark plug (81) is installed

Described lubricating oil path (P2) is formed between described actuator assembly department (55f, 55b, 55d) and described spark plug assembly department (59),

Described cylinder head (4) is in roughly raised state,

In the left and right of cylinder head (4), the sidewall (51R) of either party is upper forms described actuator assembly department (55f, 55b, 55d) and described spark plug assembly department (59),

In cylinder head (4), upper surface along the roof (67) of firing chamber (13) is formed from front cooling airflow entrance (71) of front panel (51FL) to the front and back cooling air passway (70) that rear cooling airflow outlet (72) of rear sidewall (51B) is passed through, (76a is exported from the branched halfway of described front and back cooling air passway (70) to forming the side cooling airflow stating the top close with described spark plug assembly department (59) of the sidewall (51R) of spark plug assembly department (59) to some extent, the branch's cooling air passway (75) 76b) passed through,

Export between (76a, 76b) at the side cooling airflow of described actuator assembly department (55f, 55b, 55d) and described branch cooling air passway (75) and be formed with described lubricating oil path (P2).

2. the variable stigmatic opening transmission device of internal-combustion engine according to claim 1, is characterized in that,

Bending or bending and formed near at least one actuator assembly department (55d) of described lubricating oil path (P1, P2, P3) in multiple described actuator assembly department (55f, 55b, 55d).

3. the variable stigmatic opening transmission device of internal-combustion engine according to claim 2, is characterized in that,

The vicinity of other actuator assembly department (55f, 55b) beyond at least one actuator assembly department (55d) described is also formed with described lubricating oil path (P1, P3).

4. the variable stigmatic opening transmission device of the internal-combustion engine according to any one of claims 1 to 3, is characterized in that,

Described actuator assembly department (55f, 55b, 55d) is the actuator installation base portion (55f, 55b, 55d) of giving prominence to from the outer surface of the described sidewall (51R) of described cylinder head (4) and being formed,

Air layer (49) is formed between the described actuator (45) and the described sidewall (51R) of cylinder head (4) of the upper installation of described actuator installation base portion (55f, 55b, 55d),

A part for described lubricating oil path (P1, P2, P3) is formed along described air layer (49).