CN101377137A

CN101377137A - Engine and vehicle

Info

Publication number: CN101377137A
Application number: CNA200810213955XA
Authority: CN
Inventors: 鬼村直树
Original assignee: Yamaha Motor Co Ltd
Current assignee: Yamaha Motor Co Ltd
Priority date: 2007-08-31
Filing date: 2008-09-01
Publication date: 2009-03-04
Anticipated expiration: 2028-09-01
Also published as: ATE519019T1; EP2031195A3; JP2009057914A; TWI359229B; EP2031195B1; EP2031195A2; CN101377137B; TW200912123A; ES2367461T3

Abstract

To provide a structure for determining a position of a rocker arm that allows easy maintenance, an engine (100) has a cylinder head (113) in which a valve drive mechanism (400) is provided. The valve drive mechanism (400) includes rocker arm shafts (414,415) that are fitted to the cylinder head (113); rocker arms (412,413) that are fitted to the rocker arm shafts (414,415) so as to be moveable in the axial direction; and a head cover (114) (an upper arranging member) that is attached to the cylinder head (113). The head cover (114) is provided with guide members (731,732) that engage with the rocker arms (412,413), and guide the rocker arms (412,413) to determined positions on the rocker arm shafts (414,415) when the head cover (114) is attached to the cylinder head (113).

Description

Motor and vehicle

Technical field

The present invention relates to motor, more specifically, relate to the structure of the position of the rocking arm of determining valve activator.

Background technique

The structure that is used for the rocking arm position of definite valve activator is known, for example describes in JP-A-2006-348820.In the document, rocking arm is supported in swingable mode by the pitman arm shaft that is arranged in the cylinder head.And the position of rocking arm is determined by the elastic force that is supported on the spring on the pitman arm shaft.In addition, in end cap, be provided with the motion adjusting member that the motion of the rocking arm of the elastic force of resisting this spring is regulated.

Summary of the invention

Describe also that in JP-A-2006-348820 determine in the structure of rocking arm position in the elastic force that is installed in the spring on the pitman arm shaft by use, the vibration when situations such as motor operation may cause rocking arm to move along pitman arm shaft.Thereby, may adverse effect be arranged to the maintenance work of rocking arm, become big gradually along with the increase of load on spring because determine the power of rocking arm position.

In addition, above-mentioned document has also been described a kind of structure, wherein, is provided with the motion adjusting member that the motion of the rocking arm of the elastic force of resisting this spring is regulated in end cap.In this structure, the motion of the rocking arm that vibration produced during owing to situations such as motor operations may suppress rather than make the intensity of spring to become big.Yet, in this structure, be positioned between rocking arm in the precalculated position and the motion adjusting member a small slit is arranged by spring.Thereby, the vibration when situations such as motor operation may cause rocking arm pitman arm shaft axially on vibration.If rocking arm vibration may produce the sound that knocks owing to rocking arm clashes into described motion adjusting member etc.

The present invention proposes the position that a kind of brand-new structure is determined rocking arm, so that maintenance.

Motor according to the present invention has the cylinder head that is provided with valve activator.Thereby valve activator comprises the pitman arm shaft that is installed to cylinder head, be installed to the rocking arm that this pitman arm shaft can move vertically and the top that is connected to the top of this cylinder head is provided with member.This top is provided with member and is provided with guiding elements, and when the top was provided with member and is connected to this cylinder head, this guiding elements engaged with rocking arm and rocking arm is directed to precalculated position on the pitman arm shaft.

And when member being set up being connected to the top of this cylinder head, this guiding elements can engage with rocking arm, thereby makes rocking arm remain on the pre-position on the pitman arm shaft.

According to described motor, when end cap was connected to cylinder head, guiding elements was directed to precalculated position on the pitman arm shaft with rocking arm.In addition, when taking off end cap, the position of rocking arm can change, thus convenient for maintaining.

In addition, when using a kind of structure---wherein, when the top is provided with member and has been connected to the top of cylinder head, guiding elements engages with rocking arm and this rocking arm is remained on precalculated position on the pitman arm shaft---the time, even engine luggine, also can regulate along axial the moving of pitman arm shaft, and can suppress unfavorable generating noise rocking arm.

Description of drawings

Fig. 1 illustrates the side view that is equipped with according to an example of the motorcycle of the motor of embodiment of the present invention.

Fig. 2 is the sectional view according to the part of the motor of embodiment of the present invention.

Fig. 3 relates to the sectional view according to the valve activator of the motor of embodiment of the present invention, and the position relation that camshaft is shown, opens and closes first rocking arm of valve into and open and close second rocking arm of valve.

Fig. 4 is the plan view according to the cylinder head of the motor of embodiment of the present invention, and the state when first rocking arm and second rocking arm are maintained at the primary importance place respectively is shown.

Fig. 5 is the sectional view that comprises according to the cylinder head of the camshaft of the motor of embodiment of the present invention.

Fig. 6 is the plan view according to the cylinder head of the motor of embodiment of the present invention, and the state when first rocking arm moves to the second place is shown.

Fig. 7 is the plan view according to the cylinder head of the motor of embodiment of the present invention, and the state when second rocking arm moves to the second place is shown.

Fig. 8 is the plan view according to the cylinder head of the motor of embodiment of the present invention, and the state when taking off end cap is shown.

Fig. 9 is the worm's eye view according to the end cap of the motor of embodiment of the present invention.

Figure 10 is the sectional view of the direction of arrow F in Fig. 9, and the guiding elements that is arranged on according in the end cap of the motor of embodiment of the present invention is shown.

Figure 11 is the sectional view of the direction of arrow H in Fig. 9, and first guiding elements that is arranged on according in the end cap of the motor of embodiment of the present invention is shown.

Figure 12 is the sectional view of the direction of arrow G in Fig. 9, and second guiding elements that is arranged on according in the end cap of the motor of embodiment of the present invention is shown.

Reference numerals list

1000 motorcycles (vehicle)

100 motors

113 cylinder head

114 end caps

301-303 head portion

311-313 valve rods

321-323 valve springs

331-333 valve guard rings

341-343 pads

400 valve activators

411 camshafts

412 first rocking arms

413 second rocking arms

414 first pitman arm shafts

415 second pitman arm shafts

423 sprocket wheels

424 chains

451,452 cams

453 oil supply galleries

461 bearing components

463 bearing holes

471,481 boss members

472,482 roll shaft supporting members

473,474,483 arm members

475,485 bearing holes

476,486 roll shafts

477,478,487 press member

491 plates

492 openings

501,502 packing rings (annular construction member)

600 valve gear chamber

711 pins

712 holes

731 first guiding elements (protuberance)

732 second guiding elements (protuberance)

735 inclined surfaces

736 inclined surfaces

741,742 ribs (stopper element)

The normal of h1 inclined surface

The normal of h2 inclined surface

Embodiment

After this, embodiments of the present invention are described with reference to the accompanying drawings.Notice that same functor is represented with same reference character, and given an explaination based on said circumstances.And the present invention is not restricted to following mode of execution.

In this mode of execution, as shown in Figure 2, motor 100 comprises cylinder head 113, wherein is provided with valve activator 400.Thereby valve activator 400 is provided with the

pitman arm shaft

414 and 415 that is connected to cylinder head 113, be installed to

pitman arm shaft

414 and 415 Rocker arm 4s that can move vertically 12 and 413 and the end cap 114 (top is provided with member) that is connected to cylinder head 113.End cap 114 is provided with guiding

elements

731 and 732, and when end cap 114 was connected to cylinder head 113, described guiding elements engaged with Rocker arm 4 12,413, and Rocker arm 4 12 and 413 is directed to precalculated position on

pitman arm shaft

414 and 415.

In motor 100, when end cap 114 was connected to cylinder head 113, guiding

elements

731 and 732 was directed to precalculated position on

pitman arm shaft

414 and 415 with Rocker arm 4 12 and 413.In addition, when taking off end cap 114, can change the position of Rocker arm 4 12 and 413, thus convenient for maintaining.Next, will describe motor 100 in detail.

The motor 100 of present embodiment for example is combined in the oscillating-type engine unit 101 of scooter 1000 (straddle-type vehicle) as shown in Figure 1.Engine unit 101 is provided with single cylinder engine 100 and is used as the gearbox 200 of swing arm.In this mode of execution, gearbox 200 holds vee-belt type automatic transmission, and driving force is delivered to trailing wheel 300 from motor 100 through the vee-belt automatic transmission.

From Fig. 2 as seen, motor 100 comprises crankcase 111, cylinder block 112, cylinder head 113 and end cap 114.

Crankcase 111 forms one with gearbox 200, and holds bent axle 121.Piston 123 is connected to bent axle 121 by connecting rod 122.In this mode of execution, cylinder block 112 is the foundry goods that wherein are formed with single cylinder 124.The piston 123 that is connected to bent axle is contained in the cylinder 124.Cylinder head 113 is connected to the opening that is positioned at cylinder 124 lid sides.

In this mode of execution, shown in Fig. 2 and 3, cylinder head 113 has depression 125 in the surface of cylinder 124.The firing chamber is formed between depression 125 and the piston 123.Cylinder head 113 is provided with a suction port 126 and 127 (only illustrating among Fig. 2 and 3) and a relief opening 128 of driveing to the firing chamber of splitting to the firing chamber.

As shown in Figure 3, suction port 126 (127) and relief opening 128 comprise separately valve seat 126a (127a) and 128a, valve guide 126b (127b) and 128b.Valve seat 126a (127a) and 128a are the members that the head portion 301 (302) and 303 of advancing valve 131 (132) and valve 133 described later is shelved thereon.Valve guide 126b (127b) and 128b are the members that valve 131 (132) and valve 133 are advanced in guiding, and are formed by jack, and the valve rod 311 (312) and 313 that advances valve 131 (132) and valve 133 described later passes this jack and inserts.In addition, spring seat 126c (127c) and 128c are arranged in the periphery of outer openings of valve guide 126b (127b) and 128b.The valve spring 321 (322) and 323 that advances valve 131 (132) and valve 133 described later is shelved on spring seat 126c (127c) and the 128c.

Advance valve 131 (132) and valve 133 and be respectively arranged with head portion 301 (302) and 303, valve rod 311 (312) and 313, valve spring 321 (322) and 323 and valve guard ring 331 (332) and 333.

Head portion 301 to 303 is to carry out the member of function of the valve of valve seat 126a (127a), the 128a be installed to each valve port 126 to 128.Valve rod 311 to 313 is axles of sutaining valve head part 301 to 303.The structure that each valve 131 to 133 has is: valve rod 311 to 313 is inserted into valve guide 126b (127b) and the 128b from one of the wherein appointment of the valve port 126 to 128 of cylinder head 113.When head portion 311 to 303 be installed to valve seat 126a (127a), when 128a is last, valve rod 311 to 313 protrudes intended distance from valve guide 126b (127b) and 128b on cylinder head 113.Valve spring 321 to 323 is connected to the valve rod 311 to 313 that protrudes into cylinder head 113 outsides.Valve spring 321 to 323 is shelved on the spring seat 126c (127c) and 128c that is arranged in the cylinder head 113.In addition, valve guard ring 331 to 333 is connected to the end portion of valve rod 311 to 313 with valve spring 321 to 323 with impaction state.Valve spring 321 to 323 is connected between valve guard ring 331 to 333 and spring seat 126c (127c) and the 128c with impaction state.

Each valve 131 to 133 is upwards pushed away from cylinder head 113 by the elastic reactance of valve spring 321 to 323.In this case, head portion 301 to 303 is installed on valve seat 126a (127a), the 128a of each valve port 126 to 128, and each valve port 126 is closed to 128.Open if the downward valve push rod 311-313 of any external force, head portion 301 to 303 divide from valve seat 126a (127a), the 128a of each valve port 126 to 128, and each valve port 126 is opened to 128.And when the external force that promotes valve rod 311 to 313 stops, the elastic reactance of valve spring 321 to 323 will upwards push away valve guard ring 331.Thereby head portion 301 to 303 is shelved on valve seat 126a (127a), the 128a of each valve port 126 to 128, and each valve port 126 is closed once more to 128.

In this mode of execution, valve rod 311 to 313 is pushed away downwards by Rocker arm 4 12 described later and 413.Pad 341 (342) and 343 is connected to the head portion of valve rod 311 to 313, and the thickness of each pad 341 to 343 is regulated, and makes that the gap adjustment between Rocker arm 4 12,413 and the valve rod 311 to 313 is suitable value.

Next, will explain rocking arm.

In this mode of execution, Rocker arm 4 12,413 uses the roll shaft rocking arm, and described roll shaft rocking arm is provided with roll shaft 476 (486) in the contact segment that contacts with cam 451,452, and this has reduced the contact resistance with cam 451,452, thereby has improved fuel efficiency.

Rocker arm 4 12,413 is arranged in the valve gear chamber 600 that is formed in the cylinder head 113.

As shown in Figure 3, cylinder head 113 comprises bottom partition wall 610, and this bottom partition wall forms the part that wherein is formed with suction port 126 (127) and relief opening 128.And shown in Fig. 3 to 5, valve gear chamber 600 is formed at the outside of bottom partition wall 610 by four outer walls 611 to 614 that are projected into cylinder block 112 offsides.In this mode of execution, valve gear chamber 600 is divided into two cells by supporting walls 615.Supporting walls 615 is arranged between first outer wall 611 respect to one another and second outer wall 612, and outwards outstanding from the bottom partition wall 610 of valve gear chamber 600.One side of supporting walls 615 links to each other with the 3rd outer wall 613.In this mode of execution, the open end of valve gear chamber 600 is covered by the end cap 114 that can connect and take off.

From Fig. 3 and 4 as seen, the valve rod 311 to 313 of above-mentioned valve 131 to 133 is projected in first Room 601 between first upper wall 611 and supporting walls 615.And as shown in Figure 3, valve spring 321 to 323 and valve guard ring 331 to 333 are arranged in first Room 601.

The valve guide 126b (127b), the 128b that advance valve 131 (132) and valve 133 shown in Fig. 3 opening in first Room 601 between first outer wall 611 and supporting walls 615 as shown in Figure 4, and the valve rod 311,312,313 of each valve 131 to 133 is projected in first Room 601.

Valve gear chamber 600 is held valve activator 400, and this valve activator is ordering about valve 131,132 and valve 133 is opened and closed.Second pitman arm shaft 415 that valve activator 400 is provided with camshaft 411, is used for first Rocker arm 4 12 of air inlet, is used for second Rocker arm 4 13 of exhaust, axially supports first pitman arm shaft 414 of first Rocker arm 4 12 and axially support second Rocker arm 4 13.

As shown in Figure 5, camshaft 411 is supported by first outer wall 611 of cylinder head 113 and supporting walls 615

bearing

421 and 422 by separately.Note,, saved Rocker arm 4 12,413 and pitman arm shaft 414,415 from Fig. 5 in order to make the accompanying drawing easy to understand.

Camshaft 411 is set to vertically extend with respect to cylinder barrel center line O1.As shown in Figure 4, camshaft 411 passes supporting walls 615 and is projected in the supporting walls 615 and second Room 602 between second outer wall 612 of cylinder head 113.Sprocket wheel 423 is connected on the projection.Chain 424 is installed between sprocket wheel 423 and the crankshaft 121 (referring to Fig. 2).The effect of chain 424 is to camshaft 411 input rotary driving forces, and makes camshaft 411 be its half rotational speed rotation with and speed parallel with the rotation of crankshaft 121.

From Fig. 3 and 5 as seen, camshaft 411 is provided with intake cam 451 and exhaust cam 452.Intake cam 451 and exhaust cam 452 are arranged on vertically the position away from camshaft 411 intended distances, thereby correspond respectively to first Rocker arm 4 12 that is used for air inlet and second Rocker arm 4 13 that is used for exhaust.Notice that in this mode of execution, oil supply gallery 453 is formed in the camshaft 411 and lubricant oil is fed to the cam face of intake cam 451 and exhaust cam 452.

Next, will explain Rocker arm 4 12 and 413.

As shown in Figure 3, second pitman arm shaft 415 that axially supports first pitman arm shaft 414 of first Rocker arm 4 12 and axially support second Rocker arm 4 13 is parallel to camshaft 411 and is arranged on the position that camshaft 411 top diagonal are provided with.More specifically, as shown in Figure 4, first pitman arm shaft 414 and second pitman arm shaft, 415 1 ends are installed to bearing components 461,462 in first outer wall 611 that is arranged on cylinder head 113 in valve gear chamber 600 sides, and the other end is installed in the bearing hole 463,464 that passes supporting walls 615.

First Rocker arm 4 12 that is used for air inlet is provided with cylindrical boss member, roll shaft supporting member 472 and a pair of arm member 473,474.Bearing hole 475 is formed in the boss member 471, and first pitman arm shaft 414 passes bearing hole 475 and inserts, and first pitman arm shaft 414 is inserted in the bearing hole 475, makes it to slide vertically and circumferentially.

Roll shaft supporting member 472 the extending upward upward of camshaft 411, and supports roll shaft 476 in rotating mode from the outer surface of boss member 471.As shown in Figure 3, roll shaft 476 rolls with the outer surface (cam profile face) of the intake cam 451 of camshaft 411 and contacts.

On the other hand, as shown in Figure 4, the arm member 473,474 of first Rocker arm 4 12 from the outer surface of boss member 471 towards roll shaft supporting member 472 to side-prominent.Arm member 473,474 is divided into two, and the top of arm member 473,474 be set to mutually away from and respectively two in being arranged on cylinder head 113 enter the top of the valve rod 311,312 of valve 131 (132).As shown in Figure 3, the top of arm member 473,474 is provided with depressed portion 477,478, and described depressed portion presses down the head of each valve rod that advances valve 131,132 311 (312).

Second Rocker arm 4 13 that is used for exhaust is provided with cylindrical boss member 481, roll shaft supporting member 482 and arm member 483.Bearing hole 485 is formed in the boss member 481, and second pitman arm shaft 415 passes bearing hole 485 and inserts, and second pitman arm shaft 415 is inserted in the bearing hole 485, makes it to slide vertically and circumferentially.

Roll shaft supporting member 482 is outstanding from the outer surface of boss member 481, and supports roll shaft 486 in rotating mode.As shown in Figure 3, roll shaft 486 rolls with the outer surface (cam profile face) of the intake cam 451 of camshaft 411 and contacts.On the other hand, as shown in Figure 4, the arm member 483 of second Rocker arm 4 13 from the outer surface of boss member 481 towards roll shaft supporting member 482 to side-prominent.The top of arm member 483 is provided with depressed portion 487, compresses into the top of the valve rod 311 of valve 133 under this depressed portion.

In this mode of execution, as Fig. 3 and 4 as seen, the pad 341 to 343 with appointed thickness is connected to the top of each valve rod 311 to 313.Regulate the thickness of pad 341 to 343, make that the gap between Rocker arm 4 12,413 and the valve rod 311 to 313 is a desired value.Carry out this operation, make Rocker arm 4 12,413 be arranged on the position of the head of valve rod 311 to 313, shown in Fig. 6 and 7.In this way, from the adjusting of being convenient to valve activator 400 and the angle of maintenance, Rocker arm 4 12,413 can easily move with respect to the position of the head of valve rod 313 to 313 can be better.In addition, from allowing the angle of valve activator 400 normal operations, adopt a kind of structure, wherein; the position of Rocker arm 4 12,413 on pitman arm shaft 414,415 determine at a correct position, wherein, Rocker arm 4 12,413 is positioned at the precalculated position with respect to valve rod 311 to 313.

In this mode of execution, the boss member 471 of first Rocker arm 4 12 is supported by first pitman arm shaft 414, makes it to slide vertically.More specifically, as shown in Figure 4, first Rocker arm 4 12 axially slides between the primary importance and the second place along first pitman arm shaft 414.At the primary importance place, the pressure member 477 (478) of arm member 473 (474) is towards the top of valve rod 311 (312), and at second place place, as shown in Figure 6, the pressure member 477 (478) of arm member 473 (474) is displaced to sidepiece from the top of valve rod 311 (312).

On the other hand, the boss member 481 of second Rocker arm 4 13 is supported by second pitman arm shaft 415, makes it to slide vertically.More specifically, as shown in Figure 3, second Rocker arm 4 12 axially slides between the primary importance and the second place along first pitman arm shaft 415.At the primary importance place, the pressure member 487 of arm member 483 is towards the top of valve rod 313, and at second place place, as shown in Figure 7, the pressure member 487 of arm member 483 is displaced to sidepiece from the top of valve rod 313.

In this mode of execution, as shown in Figure 4, in each primary importance, first Rocker arm 4 12 in valve gear chamber 600 sides against being arranged on bearing components 461, the second Rocker arm 4s 13 in first outer wall 611 against supporting walls 615.

In addition, the position of the pressure member 477,478,487 of each arm member 473,474,483 is defined as: make it respectively towards the top of corresponding valve rod 311 to 313.At this moment, when towards corresponding position setting in motion, first Rocker arm 4 12 and second Rocker arm 4 13 be motion on first pitman arm shaft 414 and second pitman arm shaft 415 respectively vertically in the opposite direction.

And in this mode of execution, packing ring 501,502 (annular construction member) is installed in each pitman arm shaft 414,415.Packing ring 501,502 is installed in from the sidepiece of primary importance (second place) skew, locate in described primary importance (second place), the pressure member 477,478,487 of the arm member 473,474,483 of each Rocker arm 4 12,413 is respectively towards the top of valve rod 311 to 313.

In this mode of execution, as mentioned above, after valve activator 400 connected, as shown in Figure 5, plate 491 was connected to the top of first Room 601 of valve gear chamber 600.As shown in Figure 4, the upper portion at first outer wall 611 and supporting walls 615 is formed with through hole 603.As shown in Figure 5, connect on plate 491, the unshowned in the drawings bolt outstanding from through hole 603 by nut 604 is screwed into.As shown in Figure 8, plate 491 extends between the outer wall 611 of cylinder head 113 and supporting walls 615 and is maintained at therebetween, and provides enhancing for the top of first Room 601 of valve gear chamber 600.And plate 491 has the middle body of opening.Above-mentioned Rocker arm 4 12,413 and pitman arm shaft 414,415 pass opening 492 and expose.

In this mode of execution, end cap 114 also is connected to the top of cylinder head 113.

More specifically, as shown in Figure 3, end cap 114 is the members that are connected to coating gas cylinder cap 113.In this mode of execution, the above-mentioned valve gear chamber 600 of cylinder head 113 is covered by end cap 114.As shown in Figure 9, end cap 114 has the open-topped shape of valve gear chamber 600 that can coating gas cylinder cap 113, and bolt hole 701 is formed at and bolt hole 605 corresponding positions, and this bolt hole 605 (referring to Fig. 4) is formed in outer wall 611 to 614 and the supporting walls 615.

In addition, in this mode of execution, as shown in Figure 9, end cap 114 comprises pin 711, and described pin is outstanding along the direction that end cap 114 is connected to cylinder head 113.The hole 712 that the pin 711 that is arranged in the end cap 114 wherein is installed is formed in the upper portion of outer wall of valve gear chamber of cylinder head 113, as Fig. 4 and shown in Figure 8.In this mode of execution, pin 711 is arranged on two positions of end cap 114, is formed in the cylinder head 113 with pin 711 corresponding holes.When end cap 114 was connected on the cylinder head 113, connecting direction had been determined in pin 711 and hole 712.In addition owing to be provided with pin 711 and hole 712, when end cap 114 connects, reduced loosening, thereby reduced the connection error of end cap 114.

Notice that in this mode of execution, pin 711 is arranged in the end cap 114, hole 712 is formed in the cylinder head 113.Yet it also is feasible in another member that pin 711 is formed at that in one of them member of end cap 114 and cylinder head 113 and hole is arranged on.Thereby although not shown in the drawings, pin can be arranged in the cylinder head 113, can be formed in the end cap 114 and the hole that is arranged on the pin in the cylinder head 113 wherein is installed.

And in this mode of execution, as Fig. 3 and 5 as seen, Sealing 721 is connected to end cap 114.More specifically, as shown in Figure 9, Sealing 721 be installed to be formed at end cap 114 inner surface in groove 722 in.Groove 722 form with the upper portion of cylinder head 113 against a part.Sealing 721 is lip rings that shape cooperates with groove 722.As Fig. 3 and shown in Figure 5, end cap 114 is connected to the upper portion of cylinder head 113, and Sealing 721 is installed in the groove 722.Sealing 721 forms hermetically sealing around the upper portion of cylinder head, and prevents that introduced contaminants from entering in the valve gear chamber 600 of cylinder head 113.

In this mode of execution, each Rocker arm 4 12,413 all is directed to precalculated position on each pitman arm shaft 414,415 by the end cap in the top that is arranged on cylinder head 113 114.More specifically, as shown in Figure 9, end cap 114 is provided with guiding elements 731,732.When cylinder head 113 connected, guiding elements 731,732 engaged with Rocker arm 4 12,413, and Rocker arm 4 12,413 is directed to precalculated position on the pitman arm shaft 414,415.

In this mode of execution, shown in Fig. 3 and 5, guiding elements the 731, the 732nd is connected to the outstanding protuberance of direction of cylinder head 113 along end cap 114.More specifically, guiding elements 731,732 respectively from the inboard of end cap 114 position that direction is set of first Rocker arm 4 12 towards being arranged on valve gear chamber 600 and second Rocker arm 4 13 outstanding.

In this mode of execution, as Fig. 9 and shown in Figure 10, guiding elements 731,732 comprises depressed part 733,734, and described depressed part has the corresponding circular shape of outer surface with pitman arm shaft 414,415.As shown in Figure 3, when end cap 114 was connected to cylinder head 113, first pitman arm shaft 414 and second pitman arm shaft 415 were installed in the depressed part 733,734.And in this mode of execution, guiding elements 731,732 extends towards the outside of this a pair of parallel pitman arm shaft 414,415.Inclined surface 735,736 is arranged on the top of guiding elements 731,732.

In this mode of execution, be arranged on the position of precalculated position (primary importance) skew from the pitman arm shaft 414 as the protuberance of guiding elements 731,732, when end cap 114 was connected to cylinder head 113, Rocker arm 4 12,413 guided on described pitman arm shaft.In addition, the normal of inclined surface 735,736 is orientated towards primary importance, and this primary importance has been determined the position of Rocker arm 4 12,413 on described pitman arm shaft 414,415.

More specifically, guide first guiding elements 731 of first Rocker arm 4 12 to be arranged on first pitman arm shaft 414, shown in Fig. 9 and 11, and face the position of the primary importance of valve rod 311 (312) top ends at pressure member 477 (478) towards second place skew from first Rocker arm 4 12.The normal h1 of the inclined surface 735 of first guiding elements 731 is orientated towards primary importance, and the direction that is connected to cylinder head 113 with end cap 114 is relative, and this primary importance has been determined the position on first pitman arm shaft 414 of first Rocker arm 4 12.

And, guide second guiding elements 732 of second Rocker arm 4 13 to be arranged on second pitman arm shaft 415, shown in Fig. 9 and 12, and face the position of the primary importance of valve rod 313 top ends at pressure member 487 towards second place skew from second Rocker arm 4 13.The normal h2 of the inclined surface 736 of second guiding elements 732 is orientated towards primary importance, and the direction that is connected to cylinder head 113 with end cap 114 is relative, and this primary importance has been determined the position on second pitman arm shaft 415 of second Rocker arm 4 13.

In this mode of execution, when end cap 114 was connected to cylinder head 113, the inclined surface 735,736 of guiding elements 731,732 was against the packing ring 501,502 (referring to Fig. 8) that is installed to pitman arm shaft 414,415.And when end cap 114 was connected to cylinder head 113, Rocker arm 4 12,413 moved towards above-mentioned predetermined primary importance along pitman arm shaft 414,415.In case end cap 114 is connected to cylinder head 113, the side surface 737,738 of guiding elements 731,732 is against packing ring 501,502, and Rocker arm 4 12,413 is maintained at the primary importance place on the pitman arm shaft 414,415.

In addition, in this mode of execution, as shown in Figure 9, end cap 114 is provided with stopper element 741,742, when end cap 113 is connected to cylinder head 113 and packing ring 501,502 when the opposition side of the primary importance from pitman arm shaft 414,415 is filled in respect to guiding elements 731,732, above-mentioned stopper element blocks packing ring 501,502.In this mode of execution, guiding elements 731,732 is provided with rib 741,742 at the opposition side of the primary importance of pitman arm shaft 414,415, and described rib 741,742 is as above-mentioned stopper element.

When end cap 114 is connected to cylinder head 113, if packing ring 501,502 is filled in respect to guiding elements 731,732 at the opposition side of the primary importance from pitman arm shaft 414,415, so, rib 741,742 will block packing ring 501,502, makes end cap 114 can not be connected to cylinder head 113.Thereby, can prevent from mistake to occur, and can accurately determine the position of Rocker arm 4 12,413 very assuredly owing to the workman's who operates this assembly carelessness.

And in this mode of execution, as shown in Figure 4, this a pair of pitman arm shaft 414,415 is set to parallel to each other in cylinder head 113.In addition, Rocker arm 4 12,413 is respectively installed to pitman arm shaft 414,415.And, first Rocker arm 4 12 and second Rocker arm 4 13 are constructed so that: when the pressure member 477,478,487 (referring to Fig. 3) of arm member 473,473,483 respectively when move in the precalculated position, first Rocker arm 4 12 and second Rocker arm 4 13 be axially moving along first pitman arm shaft 414 and second pitman arm shaft 415 in the opposite direction respectively.

As shown in Figure 9, guide the guiding elements 731 of first Rocker arm 4 12 and guide the guiding elements 732 of second Rocker arm 4 13 to be separately positioned in the end cap 114.When end cap 114 is connected to cylinder head 113, guiding elements 731,732 feasible Rocker arm 4 12,413 to-and-fro motion that are installed to this a pair of pitman arm shaft 414,415.

Thereby, when end cap 114 is connected to cylinder head 113, realized the offset effect of mobile Rocker arm 4 12,413 necessary power.Thereby, reduced connection end cap 114 necessary power.

In addition, in this mode of execution, as mentioned above, guiding elements 731,732 is interior side-prominent towards end cap 114.The position that is formed with guiding elements 731,732 at end cap 114 is formed with depression, thereby has improved forgeability and alleviated weight.

In this way, end cap 114 is provided with guiding elements 731,732, when end cap 114 was connected to cylinder head 113, guiding elements 731,732 engaged with Rocker arm 4 12,413, and Rocker arm 4 12,413 is directed to precalculated position (primary importance) on the pitman arm shaft 414,415.

In motor 100, when end cap 114 was connected to cylinder head 113, owing to be provided with guiding elements 731,732, Rocker arm 4 12,413 was directed into the precalculated position (primary importance) on the pitman arm shaft 414,415.In addition, when taking off end cap 114, can change the position of Rocker arm 4 12,413.

And, in this mode of execution, do not use the spring that Rocker arm 4 12,413 is urged the precalculated position on the pitman arm shaft 414,415 described in the JP-A-2006-348820.Thereby, when taking off end cap 114, can easily change the position of Rocker arm 4 12,413, and can easily carry out maintenance work.

And in this mode of execution, in case end cap 114 is connected to the top of cylinder head 113, guiding elements 731,732 will engage with Rocker arm 4 12,413 and Rocker arm 4 12,413 will be remained on precalculated position on the pitman arm shaft 414,415.Thereby, even motor 100 vibrations also can be regulated Rocker arm 4 12,413 along axial the moving of pitman arm shaft, and can prevent to produce unusual noise.

And in this mode of execution, the structure that Rocker arm 4 12,413 has is: be arranged on guiding elements 731,732 in the end cap 114 against the packing ring 501,502 that firmly is installed to pitman arm shaft 414,415.Packing ring 501,502 is clipped between the guiding elements 731,732 and Rocker arm 4 12,413 that is arranged in the end cap 114.Thereby guiding elements 731,732 is not in direct contact with the Rocker arm 4 12,413 of strong swing between the spreadable life, thereby, can reduce the noise and the wearing and tearing that produce in the end cap 114.In addition, because packing ring 501,502 is clipped between the guiding elements 731,732 and Rocker arm 4 12,413 that is arranged in the end cap 114, when end cap 114 was assembled to cylinder head 113, the power that acts on the packing ring 501,502 from guiding elements 731,732 will act on the Rocker arm 4 12,413 by packing ring 501,502.Thereby, because responsive to axial force is on Rocker arm 4 12,413, the resistance in the time of can also reducing to be assembled to end cap 114 on the cylinder head 113.Therefore, packing ring 501,502 has required intensity and has that to carry out surface treatment be favourable with the surface structure that reduces to wear and tear.A plurality of packing rings 501,502 can be inserted between Rocker arm 4 12,413 and the guiding elements 731,732.

In addition, in this mode of execution, shown in Fig. 5 and 9, guiding elements 731,732 is provided with inclined surface 735,736, when end cap 114 is connected to cylinder head 113, and 735,736 pairs of Rocker arm 4 12,413 channeling conducts of inclined surface.Being provided with of inclined surface 735,736 allows Rocker arm 4 12,413 to obtain guiding, thereby when end cap 114 is assembled to cylinder head 113, because Rocker arm 4 12,413 can obtain guiding in continuous mode gradually, resistance in the time of can reducing end cap 114 and be assembled to cylinder head 113, and make assembly manipulation more easy.

Motor has according to the embodiment of the present invention been described in the above.Yet motor according to the present invention is not restricted to above-mentioned mode of execution.

For example, as the motor of the case description of above-mentioned mode of execution---particularly the structure etc. of valve activator only is an example of the applied mode of execution of the present invention.Yet the present invention is not restricted to above-mentioned mode of execution.Motor---particularly the structure etc. of valve activator can be applied to multiple structure.

In addition, in above-mentioned example, it is end cap 114 that the top that is arranged on cylinder head 113 tops places and is provided with guiding elements 731,732 is provided with member, the top of these end cap 114 coating gas cylinder caps 113.Yet it is end cap 114 that the top is provided with that member is not restricted to.As long as the top is provided with member and is arranged on cylinder head 113 tops places and has member with the similar guiding elements 731,732 of above-mentioned parts, the top is provided with the member that member can be the cam member of sutaining valve driving mechanisms such as similar cam follower, cam holder.

And, in the superincumbent explanation, a kind of structure has been described, wherein, can be installed on the pitman arm shaft against the packing ring of rocking arm.Yet, also can use not to be provided with packing ring and rocking arm directly against the structure of living guiding elements.In this case, reduce wearing and tearing thereby carry out surface treatment for the part that rocking arm contacts with guiding elements, this is favourable.

And the member that is installed to pitman arm shaft is not restricted to packing ring.Can use any member with annular shape.Note, realize that the annular construction member of above-mentioned packing ring effect same is particularly advantageous thereby have desirable strength, material etc.

Above-mentioned motor can be applied as the motor in the straddle-type vehicle that is installed in similar scooter for example.In addition, the said structure of motor not only can advantageously use in the motor of the above-mentioned type, and can be used in other polytype motor.

Claims

1, a kind of motor has the cylinder head that is provided with valve activator, wherein

Described valve activator comprises:

Pitman arm shaft, it is installed to described cylinder head,

Rocking arm, thus it is installed to described pitman arm shaft and can moves vertically, and

The top is provided with member, and it is connected to the top of described cylinder head, wherein

Described top is provided with member and is provided with guiding elements, and when described top was provided with member and is connected to described cylinder head, described guiding elements engaged with described rocking arm, and described rocking arm is directed to precalculated position on the described pitman arm shaft.

2, motor as claimed in claim 1, wherein

Annular construction member is installed to described pitman arm shaft, makes described annular construction member to state rocking arm against the residence, and

When described top was provided with member and is connected to described cylinder head, described guiding elements was directed to precalculated position on the described pitman arm shaft by described annular construction member with described rocking arm.

3, motor as claimed in claim 1 or 2, wherein

When described top was provided with member and is connected to described cylinder head, described top was provided with the part that is installed to described pitman arm shaft that member covers described rocking arm.

4, motor as claimed in claim 1 or 2, wherein

When described top was provided with member and is connected to the top of described cylinder head, described guiding elements engaged with described rocking arm or annular construction member, and described rocking arm is remained on precalculated position on the described pitman arm shaft.

5, motor as claimed in claim 3, wherein

Described guiding elements is that the outstanding protuberance of direction that member is connected to described cylinder head is set along described top.

6, motor as claimed in claim 4, wherein

Described protuberance has inclined surface, and when described top was provided with member and is connected to described cylinder head, described inclined surface was against described rocking arm or annular construction member, and described rocking arm is directed to precalculated position on the described pitman arm shaft.

7, motor as claimed in claim 6, wherein

Described protuberance is positioned at the position of the precalculated position skew from the pitman arm shaft, when described top is provided with member and is connected to described cylinder head, described rocking arm is directed into described precalculated position, and the normal of described inclined surface is orientated the described precalculated position on described pitman arm shaft, and the position of described rocking arm is determined in described precalculated position.

8, motor as claimed in claim 5, wherein

Can be installed to described pitman arm shaft against the described annular construction member of described rocking arm, and

Described top is provided with member and has stopper element, be connected to described cylinder head and described annular construction member when the opposition side in the described precalculated position from described pitman arm shaft is filled in respect to described guiding elements when described top is provided with member, described stopper element blocks described annular construction member.

9, motor as claimed in claim 1, wherein

One of them member that described top is provided with member and cylinder head has pin, be provided with above described form on another member of member and cylinder head porose, described pin is provided with member, and to be connected to the direction of described cylinder head outstanding along described top, when described top was provided with member and is connected to described cylinder head, described pin was coupled in the described hole.

10, motor as claimed in claim 1, wherein

It is the end cap that covers the top of described cylinder head that described top is provided with member.

11, motor as claimed in claim 1, wherein

A pair of pitman arm shaft is set to be parallel to described cylinder head, and described rocking arm is installed to this a pair of pitman arm shaft, and

When described top was provided with member and is connected to described cylinder head, described guiding elements made the rocking arm to-and-fro motion that is installed to this a pair of pitman arm shaft.

12, a kind of vehicle that comprises motor as claimed in claim 1.