CN105275529B - Engine and vehicle - Google Patents
Engine and vehicle Download PDFInfo
- Publication number
- CN105275529B CN105275529B CN201510271650.4A CN201510271650A CN105275529B CN 105275529 B CN105275529 B CN 105275529B CN 201510271650 A CN201510271650 A CN 201510271650A CN 105275529 B CN105275529 B CN 105275529B
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- counterweight
- camshaft
- pivot
- cam
- axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
- F01L13/085—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio the valve-gear having an auxiliary cam protruding from the main cam profile
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The present invention relates to a kind of engine and vehicle.From the axis direction of camshaft, the straight line by the pivot of camshaft and the pivot of counterweight is set to the longitudinal axis.The straight line of pivot that is orthogonal with the longitudinal axis and passing through camshaft is set to transverse axis.In the direction parallel with the longitudinal axis the 1st longitudinal direction will be set to from the direction of pivot towards the pivot of counterweight of camshaft.A side in the direction parallel with transverse axis is set to the 1st laterally.1st horizontal opposite direction is set to the 2nd laterally.From the axis direction of camshaft, the gravity allocation of counterweight is in the 1st region.1st region is located at the 1st laterally relative to transverse axis positioned at the 1st longitudinal direction, and relative to the longitudinal axis.The circumferential end of 1st counterweight part is horizontal positioned at the 1st relative to the longitudinal axis.The circumferential end of 2nd counterweight part is horizontal positioned at the 2nd relative to the longitudinal axis.In the circumference of camshaft, the 1st counterweight part is than the 2nd counterweight minister.Decompression pin is connected with the 1st counterweight part.
Description
Technical field
The present invention relates to the engine and vehicle for possessing the mechanism of decompressor.
Background technology
When starting engine, it is necessary to rotate engine by external force, until start completion.Pass through for example, existing
Dynamic motor come make its rotate and/or by kick-starter come make its rotate method.On the other hand, in the compression of engine
Stage, the air in cylinder are compressed, so the resistance increase of rotation.In order to lower such resistance, it is known to for logical
The compression stage that external force is crossed when rotating engine lowers the mechanism of decompressor of the pressure in cylinder.
For example, the mechanism of decompressor of engine disclosed in Japanese Unexamined Patent Publication 2008-128171 have by the rotation of counterweight and
The relief cam switched between working condition and releasing state.The mechanism of decompressor is supported in the sprocket of cam chain.Accordingly, there exist
Camshaft comprising the mechanism of decompressor becomes the problem of big in the axial direction.
In engine disclosed in Japanese Unexamined Patent Publication 2008-64083, the mechanism of decompressor is configured between the both ends of camshaft
Position.The mechanism of decompressor has counterweight and relief cam, and counterweight is support shaft in a manner of it can be rotated relative to camshaft
It is supported in camshaft.Relief cam and counterweight are rotated, pin makes relief cam by pin connection by counterweight centered on support shaft
Rotation.
In the mechanism of decompressor of Japanese Unexamined Patent Publication 2008-64083, when camshaft does not rotate, counterweight is because of back-moving spring
The state for acting on and remaining turned-off.In the state of counterweight closing, relief cam turns into the shape that can be acted on exhaust valve
State.Therefore, by the startup of engine relief cam exhaust valve is acted on to open exhaust valve, lower in cylinder
Pressure.
When camshaft rotates, counterweight rotates because bearing centrifugal force around support shaft.Rise in the rotary speed of camshaft
When more than to certain setting rotary speed, because centrifugal force exceedes the spring force of back-moving spring, counterweight turns into the state opened.In counterweight
In the state of opening, relief cam turns into the state not acted on exhaust valve.
The content of the invention
Invention technical problems to be solved
In the mechanism of decompressor of Japanese Unexamined Patent Publication 2008-64083, the sky between the both ends of camshaft can be effectively utilized
Between.Therefore, compared with the situation of the mechanism of decompressor is configured outside camshaft, the camshaft comprising the mechanism of decompressor can be made sometimes in axle
Compactly formed upwards.But present inventor is after research, it is known that：In Japanese Unexamined Patent Publication 2008-64083 institutes
In the engine of the prior art of record, the mechanism of decompressor does not work and can not fully improve startability on startup sometimes.
The problem of the present invention is the engine and vehicle for providing the startability that can improve the mechanism of decompressor.
The means used to solve the problem
Decompression becomes idle reason progress when present inventor is in the engine of prior art, startup
Checking.As a result, it is found that the state for having become counterweight opening in engine start sometimes.I.e., it was found that exist sometimes
When camshaft does not rotate, counterweight is rotated to the state of opening.
According to the checking of present inventor, it is thought of as thinking that its reason is that the spring force of back-moving spring is weak.Moreover,
The reason for spring force dies down is, because by mechanism of decompressor configuration, between the both ends of camshaft, counterweight diminishes.That is, in patent
In the mechanism of decompressor of document 2, the mechanism of decompressor is configured between the both ends of camshaft, so the restriction ratio patent document 1 of configuration
The mechanism of decompressor is big.Therefore, it is necessary to matching somebody with somebody heavy phase in the mechanism of decompressor of patent document 1 in the mechanism of decompressor of patent document 2
Than reducing counterweight.
If counterweight diminishes, the quality of counterweight diminishes.In the case of rotary speed identical, the quality of counterweight is smaller, makees
Size for the centrifugal force of counterweight is smaller.Therefore, for being acted under counterweight is turned into the setting rotary speed of open mode
Diminish in the centrifugal force of counterweight.Therefore, it is also desirable to reduce spring force.
But the position of counterweight changes according to the phase of the rotation of camshaft.Sometimes counterweight opening direction with again
Camshaft stops in the state of force direction is consistent.Now, by reducing spring force, the power as caused by the gravity for acting on counterweight
Square becomes bigger than spring force, as a result, present inventor has found out why counterweight turns into open mode.
In order to prevent above-mentioned phenomenon to be contemplated that increasing spring force, but the setting rotation speed that counterweight is opened if spring force is increased
Degree can rise.The reason for producing noise can be turned into by setting the rising of rotary speed, so not preferred.
The present invention a technical scheme engine possess cylinder cover, exhaust valve, valve mechanism, camshaft, bearing and
The mechanism of decompressor.Exhaust valve is placed in cylinder cover.Exhaust valve is opened and closed valve mechanism.Camshaft with valve mechanism by contacting
To drive valve mechanism.Camshaft is supported in cylinder cover by bearing in a manner of it can rotate.The mechanism of decompressor is configured at camshaft
Axis direction both ends between.The mechanism of decompressor includes counterweight, back-moving spring, relief cam and decompression pin.Counterweight is with energy
Enough modes rotated between closed state and open state are supported in camshaft.Back-moving spring closes shape so that counterweight returns from open state
The mode of state exerts a force.Relief cam is configured to, and is contacted when counterweight is in closed state with valve mechanism, is in counterweight and is opened shape
Do not contacted during state with valve mechanism.Decompression pin connects counterweight with relief cam.
From the axis direction of camshaft, the straight line by the pivot of camshaft and the pivot of counterweight is set
For the longitudinal axis.The straight line of pivot that is orthogonal with the longitudinal axis and passing through camshaft is set to transverse axis.By in the direction parallel with the longitudinal axis
The 1st longitudinal direction is set to from the direction of pivot towards the pivot of counterweight of camshaft.By in the direction parallel with transverse axis
One side is set to the 1st laterally.1st horizontal opposite direction is set to the 2nd laterally.
From the axis direction of camshaft, the gravity allocation of counterweight is in the 1st region.1st region is located at relative to transverse axis
1st longitudinal direction, and it is horizontal positioned at the 1st relative to the longitudinal axis.Counterweight includes the 1st counterweight part and the 2nd counterweight part.1st counterweight part is from counterweight
Circumferentially extending of the pivot along wheel shaft.The circumferential end of 1st counterweight part is horizontal positioned at the 1st relative to the longitudinal axis.2nd counterweight part
Circumferentially extending from the pivot of counterweight along camshaft.The circumferential end of 2nd counterweight part is horizontal positioned at the 2nd relative to the longitudinal axis.
In the circumference of camshaft, the 1st counterweight part is than the 2nd counterweight minister.Decompression pin is connected with the 1st counterweight part.
In the engine of the technical program, the circumferential end of the 1st counterweight part is horizontal positioned at the 1st relative to the longitudinal axis.That is,
1 counterweight part horizontal upwardly extends in which will not cross the longitudinal axis the 2nd.Therefore, it is located at the 1st laterally from relative to the longitudinal axis with the 1st counterweight part
Region rise to extend to and compared in the 2nd horizontal situation up over the position of the longitudinal axis, the center of gravity of counterweight can be made away from camshaft
Pivot.Therefore, in the case of the rotary speed identical of camshaft, the centrifugal force for putting on counterweight becomes big.Thus, energy
Spring force is enough increased, the opening of the counterweight as caused by gravity can be suppressed without setting speed is increased.
In addition, the center of gravity of counterweight can be made close to the pivot of counterweight, so the weight by acting on counterweight can be reduced
The torque that power is brought.Therefore, it is possible to suppress the opening of the counterweight as caused by gravity.
And then depressurize pin and be connected with the 1st counterweight part than the 2nd counterweight minister.Therefore, connect with decompression pin with the 2nd counterweight part
Situation about connecing is compared, and can increase the distance between decompression pin and the pivot of counterweight.Thus, with the anglec of rotation phase of counterweight
To decompression sell mobile quantitative change it is big.In other words, the counterweight for counterweight to be switched to open state from closed state can be reduced
The anglec of rotation.Thereby, it is possible to the displacement for the position of centre of gravity for reducing counterweight when when counterweight being in closed state and in open state.Separately
Outside, by reducing the anglec of rotation of counterweight, the component interference of counterweight and surrounding is easily avoided.Thus, the freedom of the shape of counterweight
Degree is high.
Here, the center of gravity of counterweight when counterweight is in open state and the distance between the pivot of camshaft are than counterweight place
The distance between the center of gravity of counterweight when closed state and the pivot of camshaft are big.Therefore, when counterweight is in closed state with
The displacement of the position of centre of gravity of counterweight during in open state is bigger, then counterweight is more difficult in return to closed state.
But in the engine of the technical program, as described above, it can reduce when counterweight is in closed state with being in
The displacement of the position of centre of gravity of counterweight during open state, so counterweight is easily returned to closed state.
As described above, in the engine of the technical program, state of the counterweight in opening on startup is easily avoided,
So the startability of engine can be improved.
It is preferred that the 1st counterweight part includes part 1 and part 2.From the axis direction of camshaft, part 1 configuration
In the 1st region.From the axis direction of camshaft, part 2 is configured at the 2nd region.2nd region is relative to transverse axis positioned at the
2 longitudinal directions, and it is horizontal positioned at the 1st relative to the longitudinal axis.2nd longitudinal direction is the opposite direction of the 1st longitudinal direction.Seen from the axis direction of camshaft
Examine, the end of the 1st counterweight part is configured at the 2nd region.In this case, it is located at the 1st transverse direction from relative to the longitudinal axis with the 1st counterweight part
Region extends to be compared in the 2nd horizontal situation up over the position of the longitudinal axis, can make the center of gravity of counterweight away from the rotation of camshaft
Turn center.In addition, compared with being configured at the situation in the 1st region with the end of the 1st counterweight part, decompression pin is easily configured to remote match somebody with somebody
The pivot of weight.
It is preferred that from the axis direction of camshaft, decompression pin is configured at the 2nd region.In this case, the axle from camshaft
Line direction is observed, and the end of the 1st counterweight part can be configured at into the 2nd region.
It is preferred that from the axis direction of camshaft, the pivot of counterweight is with depressurizing the distance between pin as counterweight
It is more than the distance between pivot of pivot and camshaft.In this case, decompression pin and the rotation of counterweight can be increased
The distance between center.
It is preferred that camshaft includes the exhaust cam contacted with valve mechanism.Exhaust cam is included and protruded outward than basic circle
Nose of cam.From the axis direction of camshaft, the pivot of counterweight leans on camshaft positioned at the basic circle than exhaust cam
Footpath inwardly side position.It in this case, can approach the pivot of counterweight and the center of gravity of counterweight.
From the axis direction of camshaft, the pivot of counterweight can also be located at the outer peripheral face than nose of cam by convex
The position of the footpath of wheel shaft outward.In this case, the distance between decompression pin and the pivot of counterweight can be increased.
It is preferred that from the axis direction of camshaft, counterweight does not have the part for being configured at the 3rd region.3rd region is relative
In transverse axis positioned at the 2nd longitudinal direction, and it is horizontal positioned at the 2nd relative to the longitudinal axis.In this case, can make the center of gravity of counterweight further away from
The pivot of camshaft.In addition, can make the pivot of counterweight and the center of gravity of counterweight further to.
It is preferred that from the axis direction of camshaft, the end of the 2nd counterweight part is configured at the 4th region.4th region is relative
In transverse axis positioned at the 1st longitudinal direction, and it is horizontal positioned at the 2nd relative to the longitudinal axis.In this case, the pivot and counterweight of counterweight can be made
Center of gravity approach.
The vehicle of another technical scheme of the present invention possesses above-mentioned engine.
Technique effect
In accordance with the invention it is possible to provide the engine and vehicle for the startability that can improve the mechanism of decompressor.
Brief description of the drawings
Fig. 1 is the side view of vehicle.
Fig. 2 is the partial sectional view of engine.
Fig. 3 is the sectional view of the cylinder cover of the plane vertical with camshaft.
Fig. 4 is the amplification view of assembling cam shaft body.
Fig. 5 is the stereogram of assembling cam shaft body.
Fig. 6 is the exploded view of assembling cam shaft body.
Fig. 7 is the figure for the counterweight for showing closed state.
Fig. 8 is the figure for the counterweight for showing open state.
Fig. 9 is the enlarged drawing of exhaust cam.
Figure 10 is the side view of assembling cam shaft body.
Figure 11 is the figure of assembling cam shaft body for showing to observe from camshaft line direction.
Figure 12 is the figure of counterweight for showing to observe from camshaft line direction.
Figure 13 is the stereogram of counterweight.
Figure 14 is the side view for the assembling cam shaft body observed from Figure 10 arrow XIV direction.
Figure 15 is the figure of flange, counterweight and back-moving spring for showing to observe from camshaft line direction.
Figure 16 is the figure for showing to have laid down the cylinder cover of the state of cylinder head casing.
Figure 17 is the figure for the counterweight for showing the 1st variation.
Figure 18 is the figure for the counterweight for showing the 2nd variation.
Figure 19 is the figure for the counterweight for showing the 3rd variation.
Figure 20 is the figure for the counterweight for showing the 4th variation.
Embodiment
Hereinafter, with reference to the accompanying drawings of the vehicle 1 of embodiment.Fig. 1 is the side view of vehicle 1.Vehicle 1 is pedal
(scooter) motorcycle of type.Vehicle 1 includes vehicle body 2, front-wheel 3, trailing wheel 4, handlebar 5 and seat 6.Vehicle body 2 wraps
Containing flat pedal 2a.Vehicle body 2 supports front-wheel 3 and trailing wheel 4.Handlebar 5 and seat 6 are installed on vehicle body 2.Flat pedal 2a
Configuration is in the front of seat 6 and lower section.
Vehicle 1 includes the engine 7 of embodiment.Fig. 2 is the partial sectional view of engine 7.As shown in Fig. 2 engine 7
Include bent axle 11, crankcase 12, cylinder block 13, cylinder cover 14 and cylinder head casing 19.Cylinder block 13 is connected to crankcase 12.Vapour
Cylinder body 13 can be with crankcase 12 integrally, or can also be split.Cylinder block 13 retracts piston 15.Piston 15 is via connecting rod 16
Link with bent axle 11.Bent axle 11 is connected with gearbox 8.
Cylinder cover 14 is connected with cylinder block 13.Cylinder cover 14 includes combustion chamber 17.Spark plug 18 is installed in cylinder cover 14.
The top ends of spark plug 18 face combustion chamber 17 and configured.Cylinder head casing 19 is installed on cylinder cover 14.
Engine 7 includes valve mechanism 25 and camshaft 26.Valve mechanism 25 and camshaft 26 are placed in cylinder cover 14.It is convex
Wheel shaft 26 with valve mechanism 25 by contacting, to drive valve mechanism 25.
Camshaft 26 is supported in cylinder cover 14.Cylinder cover 14 includes the 1st supporting walls 141 and the 2nd supporting walls 142.1st support
The supporting walls 142 of wall 141 and the 2nd are arranged on the axis direction (hereinafter referred to as " camshaft line direction ") of camshaft 26.The
The supporting cam wheel axle 26 of 1 supporting walls 141.1st supporting walls 141 are via the supporting cam wheel axle 26 of the 1st bearing 27.2nd supporting walls 142 support
Camshaft 26.2nd supporting walls 142 are via the supporting cam wheel axle 26 of the 2nd bearing 28.1st bearing 27 and the 2nd bearing 28 are by camshaft 26
Cylinder cover 14 is supported in a manner of it can rotate.The external diameter of 1st bearing 27 is bigger than the external diameter of the 2nd bearing 28.In addition, the 1st
Support wall 141 can also not via the 1st bearing 27 supporting cam wheel axle 26.2nd supporting walls 142 can also be not via the 2nd bearing 28
And supporting cam wheel axle 26.
Camshaft 26 includes the 1st camshaft mandrel end 261 and the 2nd camshaft mandrel end 262.On camshaft line direction, the 1st axle
27 configurations are held in the position leaned on than the 2nd camshaft mandrel end 262 near the 1st camshaft mandrel end 261.On camshaft line direction,
2nd bearing 28 is configured in the position leaned on than the 1st camshaft mandrel end 261 near the 2nd camshaft mandrel end 262.
Cam chain 29 is wound with camshaft 26 and bent axle 11.Specifically, the 1st sprocket is installed in camshaft 26
31.1st sprocket 31 is installed on the 1st camshaft mandrel end 261.The 2nd sprocket 32 is installed in bent axle 11.Cam chain 29 is wound in
1st sprocket 31 and the 2nd sprocket 32.
The rotation of bent axle 11 is delivered to camshaft 26 via cam chain 29, and thus, camshaft 26 rotates.Camshaft 26 includes
Admission cam 263 and exhaust cam 264.Admission cam 263 and exhaust cam 264 are arranged on camshaft line direction.It is logical
Cross camshaft 26 to rotate, admission cam 263 and exhaust cam 264 rotate.Admission cam 263 and exhaust cam 264 and valve machine
Structure 25 contacts, and is rotated by admission cam 263 and exhaust cam 264, drives valve mechanism 25.
Fig. 3 is the sectional view of the cylinder cover 14 of the plane vertical with camshaft 26.As shown in figure 3, engine 7 includes exhaust
Door 23 and inlet valve 24.Cylinder cover 14 includes the air inlet 21 and exhaust outlet 22 connected with combustion chamber 17.Exhaust valve 23 and air inlet
Door 24 is placed in cylinder cover 14.Air inlet 21 is opened and closed inlet valve 24.Exhaust outlet 22 is opened and closed exhaust valve 23.Valve
Inlet valve 24 and exhaust valve 23 are opened and closed for mechanism 25.
Inlet-valve spring 241 is installed in inlet valve 24.Inlet-valve spring 241 closes the side of air inlet 21 in inlet valve 24
Inlet valve 24 is exerted a force upwards.Exhaust valve spring 231 is installed in exhaust valve 23.Exhaust valve spring 231 is closed in exhaust valve 23
Exhaust valve 23 is exerted a force on the direction of exhaust outlet 22.
Valve mechanism 25 includes exhaust rocker arm axle 33 and exhaust rocker arm 34.Exhaust rocker arm axle 33 is abreast matched somebody with somebody with camshaft 26
Put.Exhaust rocker arm axle 33 is supported in cylinder cover 14.Exhaust rocker arm 34 centered on exhaust rocker arm axle 33 in a manner of it can be swung
It is supported in exhaust rocker arm axle 33.Exhaust rocker arm 34 is configured to act exhaust valve 23.Exhaust rocker arm 34 includes arm main body
341st, roller 342 and exhaust valve press section 343 are vented.
Arm main body 341 is supported in exhaust rocker arm axle 33 in a manner of it can swing.One end of arm main body 341 will be vented roller
342 supports are to rotate.The other end support exhaust valve press section 343 of arm main body 341.It is vented roller 342 and exhaust cam
264 contacts, are rotated by the rotation of exhaust cam 264.The top of exhaust valve press section 343 and the rod end 232 of exhaust valve 23
Relatively.
When boosting exhaust roller 342 by exhaust cam 264, swung by exhaust rocker arm 34, exhaust valve press section 343
Press the rod end 232 of exhaust valve 23.Thus, exhaust valve 23 is pressed and opens exhaust outlet 22.Do not pushed away by exhaust cam 264
When playing exhaust roller 342, exhaust valve 23 is boosted by exhaust valve spring 231 to close exhaust outlet 22.
Valve mechanism 25 includes air inlet rocker arm shaft 35 and intake rocker 36.Intake rocker axle 35 is abreast matched somebody with somebody with camshaft 26
Put.Intake rocker axle 35 is supported in cylinder cover 14.Intake rocker 36 centered on intake rocker axle 35 in a manner of it can be swung
It is supported in intake rocker axle 35.Intake rocker 36 is configured to act inlet valve 24.Intake rocker 36 includes arm main body
361st, air inlet roller 362 and inlet valve press section 363.
Arm main body 361 is supported in intake rocker axle 35 in a manner of it can swing.One end of arm main body 361 is by air inlet roller
362 supports are to rotate.The other end support inlet valve press section 363 of arm main body 361.Air inlet roller 362 and admission cam
263 contacts, are rotated by the rotation of admission cam 263.The top of inlet valve press section 363 and the rod end 242 of inlet valve 24
Relatively.
When boosting air inlet roller 362 by admission cam 263, swung by intake rocker 36, inlet valve press section 363
Press the rod end of inlet valve 24.Thus, inlet valve 24 is pressed and opens air inlet 21.Do not boosted by admission cam 263
During air inlet roller 362, inlet valve 24 is boosted by inlet-valve spring 241 to close air inlet 21.
As shown in Fig. 2 engine 7 includes the mechanism of decompressor 40.Fig. 4 is camshaft 26, the bearing 27 of the mechanism of decompressor 40 and the 1st
Assembly (hereinafter referred to as " assembling cam shaft body ") enlarged drawing.On camshaft line direction, the mechanism of decompressor 40 is configured
Between 1 camshaft mandrel end 261 and the 2nd camshaft mandrel end 262.The mechanism of decompressor 40 configure the 1st supporting walls 141 in cylinder cover 14 with
Between 2nd supporting walls 142.
Fig. 5 is the stereogram of assembling cam shaft body.Fig. 6 is the exploded view of assembling cam shaft body.As shown in figs.5 and 6,
The mechanism of decompressor 40 includes flange 41, counterweight 42, relief cam 43, decompression pin 44 and back-moving spring 45.
As shown in fig. 6, flange 41 and camshaft 26 are splits, camshaft 26 is fixed on.Specifically, flange 41 includes
Hole 411.Camshaft 26 is inserted in the hole 411 of flange 41, flange 41 is fixed on camshaft 26 by press-in.In camshaft line side
Upwards, flange 41 is configured between counterweight 42 and exhaust cam 264.
Flange 41 includes the 1st convex portion 412 and the 2nd convex portion 413.Trunnion (pivot pin) 46 is installed in the 1st convex portion 412.
2nd convex portion 413 is provided with hole 414.Relief cam 43 is inserted in the hole 414 of the 2nd convex portion 413.
On camshaft line direction, counterweight 42 is configured between the 1st bearing 27 and flange 41.Counterweight 42 is can close shape
The mode rotated between state and open state is supported in camshaft 26.
Fig. 7 and Fig. 8 is the A-A sectional views in Fig. 4.Fig. 7 shows the counterweight 42 of closed state.Fig. 8 shows matching somebody with somebody for open state
Weigh 42.
Relief cam 43 is supported in flange 41 in a manner of it can rotate.Specifically, counterweight 42 via trunnion 46 with energy
The mode enough rotated is supported in flange 41.Counterweight 42 is switched by being rotated centered on trunnion 46 between closed state and open state.
Relief cam 43 is connected via decompression pin 44 with counterweight 42.Thus, relief cam 43 is corresponding to the rotation of counterweight 42
Ground rotates.
Specifically, as shown in Fig. 4 and Fig. 6, relief cam 43 includes head 431 and axle portion 432.Axle portion 432 is inserted
In the hole 414 of flange 41.Head 431 is configured between flange 41 and counterweight 42.Hole 414 of the external diameter on head 431 than flange 41
Internal diameter it is big.Head 431 includes groove portion 433.Groove portion 433 has the shape from the sunken end face on head 431.Groove portion 433 is from the beginning
The interior side extension of the outer peripheral face headward 431 in portion 431.The end for depressurizing pin 44 is configured in groove portion 433.In addition, in this reality
Apply in mode, interior side means interior side radially.In addition, foreign side means foreign side radially.
Axle portion 432 includes cam part 434.Exhaust cam 264 includes recess 265, and recess 265 has from exhaust cam 264
The shape that is recessed towards the interior side of exhaust cam 264 of periphery.Fig. 9 is the enlarged drawing of exhaust cam 264.Figure 10 is camshaft group
Fill the side view of body.
Cam part 434 is configured in the recess 265 of exhaust cam 264.The section of cam part 434 is cut off with a part
Circular shape.As described above, relief cam 43 and the rotation of counterweight 42 correspondingly rotate.Fig. 9 (A) shows that counterweight 42 is in
Relief cam 43 during open state.Fig. 9 (B) shows the relief cam 43 when counterweight 42 is in closed state.Relief cam 43 is with matching somebody with somebody
Weigh 42 rotation correspondingly, the state that is contacted in the exhaust roller 342 with valve mechanism 25 and do not contacted with exhaust roller 342
Switch between state.
Specifically, as shown in Fig. 9 (A), when counterweight 42 is in open state, the cam part 434 of relief cam 43 it is whole
Body is configured in recess 265.That is, when counterweight 42 is in open state, cam part 434 turns into not from the periphery of exhaust cam 264
Face is projected into the state of foreign side.Thus, when counterweight 42 is in open state, relief cam 43 does not contact with exhaust roller 342.
As shown in Fig. 9 (B), when counterweight 42 is in closed state, the part configuration of the cam part 434 of relief cam 43 exists
Outside recess 265.That is, when counterweight 42 is in closed state, cam part 434 turns into a part and dashed forward from the outer peripheral face of exhaust cam 264
Go out the state to foreign side.Thus, when counterweight 42 is in closed state, relief cam 43 contacts with exhaust roller 342.
Back-moving spring 45 is exerted a force in a manner of counterweight 42 is returned to closed state from open state to counterweight 42.In present embodiment
In, back-moving spring 45 is helical spring.But back-moving spring 45 can also be other kinds of spring.As shown in fig. 6, reset
Spring 45 includes the 1st spring end 451 and the 2nd spring end 452.1st spring end 451 upwardly extends in camshaft line side.
2nd spring end 452 upwardly extends in the side intersected with camshaft line direction.Week of 2nd spring end 452 in back-moving spring 45
Upwardly extend.1st spring end 451 is engaging in flange 41.2nd spring end 452 is engaging in counterweight 42.
Then, the construction of counterweight 42 is described in detail.As shown in fig. 7, from camshaft line direction, camshaft 26 will be passed through
Pivot c1 and the pivot c2 straight line of counterweight 42 be set to longitudinal axis Y.Will be orthogonal with longitudinal axis Y and by camshaft 26
Pivot c1 straight line is set to transverse axis X.By in the direction parallel with longitudinal axis Y from the pivot c1 of camshaft 26 towards counterweight
42 pivot c2 direction is set to the 1st longitudinal y1.1st longitudinal y1 opposite direction is set to the 2nd longitudinal y2.Will be with transverse axis
A side in direction parallel X is set to the 1st horizontal x1.1st horizontal x1 opposite direction is set to the 2nd horizontal x2.
It is set in addition, the 1st longitudinal y1 will be located at relative to transverse axis X and be located at the 1st horizontal x1 region relative to longitudinal axis Y
1st region A1.The region for being located at the 2nd longitudinal y2 relative to transverse axis X and be located at the 1st horizontal x1 relative to longitudinal axis Y is set to the 2nd
Region A2.From camshaft line direction, the 2nd longitudinal y2 will be located at relative to transverse axis X and is located at the 2nd laterally relative to longitudinal axis Y
X2 region is set to the 3rd region A3.The 1st longitudinal y1 will be located at relative to transverse axis X and be located at the 2nd horizontal x2's relative to longitudinal axis Y
Region is set to the 4th region A4.
In addition, Fig. 7 shows the counterweight 42 observed on camshaft line direction from the side of the 1st camshaft mandrel end 261.Therefore,
On camshaft line direction from the side of the 1st camshaft mandrel end 261 in the case of define above-mentioned direction x1, x2, y1, y2 and
Region A1-A4, but can also on camshaft line direction from the side of the 2nd camshaft mandrel end 262 in the case of define it is above-mentioned
Direction x1, x2, y1, y2 and region A1-A4.
As shown in fig. 7, counterweight 42 has the shape along the circumferentially extending of camshaft 26.Counterweight 42 is in the 1st region A1,
Configuration is around camshaft 26 in 2 region A2 and the 4th region A4.Counterweight 42 has in the circumference of camshaft 26 across the
The shape in multiple regions in the 1~the 4th region A1-A4.From camshaft line direction, counterweight 42 is without configuration in the 3rd area
Domain A3 part.
Specifically, counterweight 42 includes the 1st counterweight part 47 and the 2nd counterweight part 48.Rotation of 1st counterweight part 47 from counterweight 42
Center c2 plays the circumference along camshaft 26 and extended to the 1st horizontal x1.The circumferential end 471 of 1st counterweight part 47 is relative to vertical
Axle Y is located at the 1st horizontal x1.That is, the overall of the 1st counterweight part 47 is located at the 1st horizontal x1 relative to longitudinal axis Y.From camshaft line direction
Observation, the end 471 of the 1st counterweight part 47 is configured at the 2nd region A2.
Circumference of 2nd counterweight part 48 from the pivot c2 of counterweight 42 along camshaft 26 and to the 2nd horizontal x2 extensions.2nd
The circumferential end 481 of counterweight part 48 is located at the 2nd horizontal x2 relative to longitudinal axis Y.That is, the entirety of the 2nd counterweight part 48 is relative to vertical
Axle Y is located at the 2nd horizontal x2.From camshaft line direction, the end 481 of the 2nd counterweight part 48 is configured at the 4th region A4.
In the circumference of camshaft 26, the counterweight part 48 of the 1st counterweight part 47 to the 2 is long.That is, around the pivot of camshaft 26
C1 counterweight 42 from pivot c2 to the end 471 of the 1st counterweight part 47 angle than counterweight 42 from pivot c2 to
The angle of the end 481 of 2nd counterweight part 48 is big.
1st counterweight part 47 includes part 1 421 and part 2 422.From camshaft line direction, part 1 421 is matched somebody with somebody
It is placed in the 1st region A1.From camshaft line direction, part 2 422 is configured at the 2nd region A2.2nd counterweight part 48 is configured at
4th region A4.
Counterweight 42 includes kingpin support 423.Kingpin support 423 is matched somebody with somebody throughout part 1 421 and the ground of part 2 422
Put.Trunnion 46 is installed on kingpin support 423.
Exhaust cam 264 includes the nose of cam 267 (camlobe) protruded outward relative to basic circle 266.From camshaft
Line direction is observed, and a part for trunnion 46 is not overlapping with nose of cam 267.That is, from camshaft line direction, the one of trunnion 46
Part is located at the position of the outer side of outer peripheral face than exhaust cam 264.In addition, from camshaft line direction, trunnion 46 includes
Positioned at the part of the position than 266 inner side of basic circle.
Decompression pin 44 is connected with the 1st counterweight part 47.Specifically, decompression pin 44 is connected with part 2 422.From camshaft
Line direction is observed, and decompression pin 44 is configured at the 2nd region A2.From camshaft line direction, the pivot c2 of counterweight 42 is with subtracting
The distance between pad 44 is more than the distance between pivot c2 and the pivot c1 of camshaft 26 of counterweight 42.
Figure 11 is the figure of assembling cam shaft body for showing to observe from camshaft line direction.As shown in figure 11, from camshaft
Line direction is observed, and the profile of flange 41 includes the part bigger than the profile of the 1st bearing 27.Specifically, the 1st convex portion 412 is relative
Protruded outward in the outer peripheral face of the 1st bearing 27.
Under closed state, the part 1 421 of counterweight 42 includes the 1st protuberance 424.From camshaft line direction, the 1st
Protuberance 424 protrudes outward relative to the outer peripheral face of the 1st bearing 27.From camshaft line direction, outside part 2 422
Side face is located at the position of the inner side of outer peripheral face than the 1st bearing 27.From camshaft line direction, the periphery of the 2nd counterweight part 48
Face is located at the position of the inner side of outer peripheral face than the 1st bearing 27.
From camshaft line direction, kingpin support 423 is included and protruded outward relative to the outer peripheral face of the 1st bearing 27
Protuberance 425.The maximum of the prominent length of protuberance 425 is bigger than the maximum of the prominent length of the 1st protuberance 424.That is,
The protuberance 424 of protuberance 425 to the 1 is big, in radially protruding for the 1st bearing 27.In addition, prominent length means the 1st bearing 27
The prominent length from the outer peripheral face of the 1st bearing 27 radially.
As shown in figure 11, the 1st bearing 27 includes lubrication groove 271 and foreign steamer 272.Lubrication groove 271 contacts with camshaft 26.Foreign steamer
272 contact with the 1st supporting walls 141 of cylinder cover 14.As shown in fig. 7, counterweight 42 includes lubrication groove contact site 426.Lubrication groove contact site
426 configure side by side on camshaft line direction with lubrication groove 271.Lubrication groove contact site 426 is from the counterweight 42 adjacent with the 1st bearing 27
Surface protruded towards lubrication groove 271.
As shown in figure 11, lubrication groove contact site 426 is located at the position of the inner side of inner peripheral surface than foreign steamer 272.No matter in addition, match somebody with somebody
42 which state in closed state and open state are weighed, lubrication groove contact site 426 is all located at the inner side of inner peripheral surface than foreign steamer 272
Position.From camshaft line direction, at least a portion of lubrication groove contact site 426, the pivot c1 phases with camshaft 26
Than configuring near the pivot c2 of counterweight 42.From camshaft line direction, lubrication groove contact site 426 is located at counterweight 42
Pivot c2 and camshaft 26 between.As shown in figure 4, in the state of lubrication groove contact site 426 contacts with lubrication groove 271, match somebody with somebody
42 other parts are weighed not contact with foreign steamer 272.
Specifically, in the case where counterweight 42 is in closed state, lubrication groove contact site 426 across the 4th region A4, the 1st region A1 and
2nd region A2 and configure.Lubrication groove contact site 426 includes the 1st contact site 426a, the 2nd contact site 426b and the 3rd contact site
426c.In the case where counterweight 42 is in closed state, the 1st contact site 426a is configured at the 1st region A1.In the case where counterweight 42 is in closed state,
2nd contact site 426b is configured at the 2nd region A2.In the case where counterweight 42 is in closed state, the 3rd contact site 426c is configured at the 4th region
A4.From camshaft line direction, the 1st contact site 426a area is bigger than the 2nd contact site 426b area.From camshaft line side
To observation, the 1st contact site 426a area is bigger than the 3rd contact site 426c area.
In fig. 12, G1 represents the position of the center of gravity of counterweight 42.G2 indicate without the 1st protuberance 424 in the case of counterweight
The position of 42 center of gravity.In addition, in fig. 12, hachure is appended to the 1st protuberance 424.So-called " the feelings without the 1st protuberance 424
Condition ", it is intended that remove the state behind the part for appending hachure in fig. 12.In addition, in fig. 12, the 1st is shown with double dot dash line
The outer peripheral face of bearing 27.As shown in figure 12, from camshaft line direction, the center of gravity G1 of counterweight 42 is configured at the 1st region A1.Match somebody with somebody
The distance between 42 center of gravity G1 and the pivot c1 of camshaft 26 are weighed than in the center of gravity G1 of counterweight 42 and the rotation of counterweight 42
The distance between heart c2 is big.From camshaft line direction, the 1st protuberance 424 be included in the 1st bearing 27 circumference on be located at than
The center of gravity G2 of counterweight 42 during without the 1 protuberance 424 pivot c2 for being located proximate to counterweight 42 part 424a and remote
The pivot c2 of counterweight 42 part 424b.On the overhang of the outer peripheral face from the 1st bearing 27 outward, near part
424a is bigger than remote part 424b.
In addition, from camshaft line direction, close to counterweight compared with the center of gravity G1 of counterweight 42 in lubrication groove contact site 426
42 pivot c2 part, than the rotation away from counterweight 42 compared with the center of gravity G1 of counterweight 42 in lubrication groove contact site 426
Center c2 part is big.For example, radial direction of the 1st contact site 426a radially of camshaft 26 Breadth Maximum than camshaft 26
On the 2nd contact site 426b Breadth Maximum it is big.
Figure 13 is the stereogram on the surface for the side of the 2nd camshaft mandrel end 262 for showing counterweight 42.Figure 14 is in Fig. 10 from arrow
The side view of the assembling cam shaft body of head XIV direction observation.As shown in figure 13, the part 1 421 in camshaft line direction is most
The maximum gauge of the part 2 422 in large thickness ratio camshaft line direction is big.The maximum of 2nd counterweight part 48 in camshaft line direction
The maximum gauge of the part 2 422 in thickness ratio camshaft line direction is big.
As shown in figure 13, part 1 421 includes inside diameter 421a and outer diameter part 421b.Inside diameter 421a is located at outer diameter part
421b interior side.The inside diameter 421a in the outer diameter part 421b in camshaft line direction thickness ratio camshaft line direction thickness is big.
Outer diameter part 421b includes above-mentioned 1st protuberance 424.Therefore, the maximum gauge of the 1st protuberance 424 in camshaft line direction is than convex
The maximum gauge of the part 2 422 in wheel axis direction is big.The maximum gauge of 1st protuberance 424 in camshaft line direction compares cam
The maximum gauge of 2nd counterweight part 48 of axis direction is big.The thickness ratio camshaft line of 1st protuberance 424 in camshaft line direction
The thickness of the kingpin support 423 in direction is big.
As shown in Figure 10, from the radial direction of camshaft 26, a part for counterweight 42 is overlapping with flange 41.Specifically,
From the radial direction of camshaft 26, the outer diameter part 421b of part 1 421 is overlapping with flange 41.The side of 2nd camshaft mandrel end 262
The surface of 2nd counterweight part 48 and inside diameter 421a surface, it is relative with the surface of the flange 41 of the side of the 1st camshaft mandrel end 261.
Between part 2 422 and flange 41, the head 431 of above-mentioned relief cam 43 is configured.
As shown in figure 13, kingpin support 423 includes retracting portion 423a and boss portion 423b.Boss portion 423b is from retracting portion
423a protrudes along camshaft line direction.The part 1 in the retracting portion 423a in camshaft line direction thickness ratio camshaft line direction
The thickness of 421 and the 2nd counterweight part 48 is small.Therefore, retracting portion 423a has from the surface of counterweight 42 on camshaft line direction
The shape of depression.
Figure 15 is the figure of flange 41, counterweight 42 and back-moving spring 45 from the side of the 2nd camshaft mandrel end 262.Such as Figure 15
Shown, retracting portion 423a retracts back-moving spring 45.Boss portion 423b is inserted in above-mentioned back-moving spring 45.Set in boss portion 423b
There is hole 423c.Trunnion 46 is inserted in boss portion 423b hole 423c.
As shown in Figure 13 and Figure 15, counterweight 42 includes the 2nd engaging portion 42b.2nd engaging portion 42b is engaging in back-moving spring
45 the 2nd spring end 452.2nd engaging portion 42b is contained in part 1 421.Specifically, the 2nd engaging portion 42b is the 1st
The stage portion formed in part 421 relative to kingpin support 423.
As shown in Figure 14 and Figure 15, flange 41 includes the 1st engaging portion 42a.1st engaging portion 42a is engaging in back-moving spring
45 the 1st spring end 451.Specifically, the 1st engaging portion 42a is a part for the 1st convex portion 412.1st engaging portion 42a and method
Orchid 41 is integrally formed.For example, flange 41 includes the 1st engaging portion 42a and integral by the preparation method such as sintering, forging or cast
Shaping.
Figure 16 is the figure for showing to have unloaded the cylinder cover 14 of the state of cylinder head casing 19.As shown in figure 16, cylinder cover 14 wraps
Containing the 1st bearings hole 143.1st bearings hole 143 supports the 1st bearing 27.1st bearings hole 143 is arranged at the 1st
Support wall 141.1st bearings hole 143 includes the 1st recess 144, the recess 146 of second recesses 145 and the 3rd.1st recess 144,
2 recesses 145 and the 3rd recess 146 are centrally located at the opposite side of bent axle 11 relative to the 1st bearings hole 143.1st recess
144 have the shape that can pass through for the 1st protuberance 424 and admission cam 263.Second recesses 145 have can supply and discharge gas it is convex
The shape that wheel 264 passes through.3rd recess 146 has the shape that can pass through for kingpin support 423.In addition it is also possible to it is the 1st
A part for recess 144 is centrally located at the opposite side of bent axle 11 relative to the 1st bearings hole 143, other parts relative to
1st bearings hole 143 is centrally located at the phase homonymy of bent axle 11.Or or, a part for second recesses 145 is relative
The opposite side of bent axle 11 is centrally located in the 1st bearings hole 143, other parts are relative in the 1st bearings hole 143
The heart is located at the phase homonymy of bent axle 11.
In the engine of present embodiment, the circumferential end 471 of the 1st counterweight part 47 is horizontal positioned at the 1st relative to longitudinal axis Y
x1.That is, the 1st counterweight part 47 extends not across longitudinal axis Y on the 2nd horizontal x2.Therefore, with the 1st counterweight part 47 from relative to vertical
The region that axle Y is located at the 1st horizontal x1 extends to the situation of the position for crossing longitudinal axis Y on the 2nd horizontal x2 and compared, and can make counterweight
Pivot c1s of the 42 center of gravity G1 away from camshaft 26.Therefore, in the case of the rotary speed identical of camshaft 26, apply
Become big in the centrifugal force of counterweight 42.Spring force thus, it is possible to increase back-moving spring 45, so not making setting speed rise with regard to energy
Enough suppress the opening of the counterweight 42 as caused by gravity.
In addition, the center of gravity G1 of counterweight 42 can be made close to the pivot c2 of counterweight 42, so can reduce by acting on
The torque that the gravity belt of counterweight 42 is come.Therefore, it is possible to suppress the opening of the counterweight 42 as caused by gravity.
And then depressurize pin 44 and be connected with the 1st counterweight part 47 than the minister of the 2nd counterweight 42.Therefore, it is connected to decompression pin 44
The situation of 2nd counterweight 42 is compared, and can increase the distance between decompression pin 44 and the pivot c2 of counterweight 42.Thus, with
The mobile quantitative change for depressurizing pin 44 that the anglec of rotation of counterweight 42 is relative is big.In other words, can reduce for by counterweight 42 from closing shape
State switches to the anglec of rotation of the counterweight 42 of open state.Thereby, it is possible to reduce when counterweight 42 is in closed state and in open state
When counterweight 42 center of gravity G1 positions displacement.In addition, the anglec of rotation by reducing counterweight 42, easily avoids counterweight 42 and week
The component interference enclosed.Thus, the free degree of the shape of counterweight 42 is high.
Herein, between the center of gravity G1 of counterweight 42 and the pivot c1 of camshaft 26 when counterweight 42 is in open state away from
From the distance between the center of gravity G1 of the counterweight 42 when being in closed state than counterweight 42 and pivot c1 of camshaft 26 is big.Cause
And counterweight 42 when being in closed state and in open state when counterweight 42 center of gravity G1 position displacement it is bigger, then counterweight 42
More it is difficult in return to closed state.
But in the engine of present embodiment, as described above, can reduce when counterweight 42 is in closed state and be in
The displacement of the center of gravity G1 of counterweight 42 during open state position, so counterweight 42 is easily returned to closed state.
As described above, in the engine of the technical program, shape of the counterweight 42 in opening on startup is easily avoided
State, so the startability of engine 7 can be improved.
From camshaft line direction, the end 471 of the 1st counterweight part 47 is configured at the 2nd region A2.Therefore, with the 1st counterweight
Portion 47 extends on the 2nd horizontal x2 the situation for the position for crossing longitudinal axis Y from the region for being located at the 1st horizontal x1 relative to longitudinal axis Y
Compare, the center of gravity G1 of counterweight 42 can be made away from the pivot c1 of camshaft 26.In addition, the end 471 with the 1st counterweight part 47
The situation for being configured at the 1st region A1 is compared, and will easily be depressurized pin 44 and is configured to the pivot c2 away from counterweight 42.
From camshaft line direction, decompression pin 44 is configured at the 2nd region A2.Therefore, from camshaft line direction, energy
It is enough to configure the end 471 of the 1st counterweight part 47 in the 2nd region A2.
From camshaft line direction, the pivot c2 of counterweight 42 is with depressurizing the rotation that the distance between pin 44 is counterweight 42
Turn more than the distance between center c2 and pivot c1 of camshaft 26.Therefore, it is possible to increase decompression pin 44 and counterweight 42
The distance between pivot c2.
From camshaft line direction, counterweight 42 is without configuration in the 3rd region A3 part.Therefore, it is possible to make counterweight
Pivot c1s of the 42 center of gravity G1 further away from camshaft 26.In addition, the pivot c2 and counterweight of counterweight 42 can be made
42 center of gravity G1 further to.
From camshaft line direction, the end 481 of the 2nd counterweight 42 is configured at the 4th region A4.Therefore, it is possible to make to match somebody with somebody
Weigh 42 pivot c2 and the center of gravity G1 of counterweight 42 is approached.
One embodiment of the present invention is this concludes the description of, but the present invention is not limited to above-mentioned embodiment, can not take off
From carrying out various changes in the range of the purport of invention.
The shape of counterweight 42 is not limited to the shape of above-mentioned embodiment, can also be changed.For example, Figure 17 is to show
The figure of the counterweight 42 of 1 variation.As shown in figure 17, part 2 422 can also include the 2nd protuberance 427.From camshaft 26
Axis direction is observed, and the outer peripheral face of the bearing 27 of the 2nd protuberance 427 to the 1 protrudes outward.The volume ratio of 1st protuberance 424
The volume of 2 protuberances 427 is big.In this case, it is same with above-mentioned embodiment, can make the center of gravity G1 of counterweight 42 farther away from
The pivot c1 of camshaft 26.In addition, the bulky situation phase with the protuberance 424 of volume ratio the 1st of the 2nd protuberance 427
Compare, the center of gravity G1 of the counterweight 42 pivot c2 for being closely located to counterweight 42 can be made.
Or the circumferential lengths of counterweight can be shorter than the counterweight 42 of above-mentioned embodiment.For example, the week of the 1st counterweight part 47
The 1st region A1 can also be configured to end 471.
Or the 1st protuberance 424 of counterweight 42 can also be omitted.That is, from camshaft line direction, part 1 421
The position of the inner side of outer peripheral face than the 1st bearing 27 can also be located at.
Figure 18 is the figure for the counterweight 42 for showing the 2nd variation.As shown in figure 18, from camshaft line direction, trunnion branch
Support part 423 can also be located at the position of the inner side of outer peripheral face than the 1st bearing 27.
Figure 19 is the figure for the counterweight 42 for showing the 3rd variation.As shown in figure 19, from camshaft line direction, trunnion 46
The position of the 266 inner side of basic circle than exhaust cam 264 can also be located at.That is, from camshaft line direction, the rotation of counterweight 42
The position of the 266 inner side of basic circle than exhaust cam 264 can also be located at by turning center c2.
Figure 20 is the figure for the counterweight 42 for showing the 4th variation.As shown in figure 20, from camshaft line direction, counterweight 42
Pivot c2 can also be located at than exhaust cam 264 267 outer side of nose of cam position.In addition, trunnion 46 is whole
Body can also be located at the position of the outer side of outer peripheral face than exhaust cam 264.
In the above-described embodiment, counterweight 42 is supported in camshaft 26 via flange 41, but counterweight 42 can also be propped up directly
Support in camshaft 26.In the above-described embodiment, flange 41 and camshaft 26 are splits, can also be fixed on by press-in
Camshaft 26, it can also be fixed by the fixing means beyond press-in.Or flange can also be with the bodily form of camshaft 26 1
Into.
The lubrication groove contact site of counterweight 42 can also be omitted.The retracting portion of counterweight 42 can also be omitted.That is, back-moving spring also may be used
With the position being configured at beyond counterweight 42.
In the above-described embodiment, the example as vehicle is exemplified with pedal motorcycle, but the vehicle of the present invention is unlimited
In the other kinds of motorcycle such as pedal motorcycle or sports type, cross-country type, light motorcycle.Herein, motorcycle
Two-wheeled is not limited to, also the vehicle comprising three-wheel.In addition, the vehicle of the present invention is preferably motorcycle, non-level land traveling vehicle
The riding vehicle such as (ALL-TERRAIN VEHICLE) or snow mobile is but it is also possible to be the vehicle beyond riding vehicle.
Term used herein and expression are to be used to illustrate, being not intended to limit property is explained.It must be recognized that, however not excluded that
Any equipollent for the feature item for being shown in which and describing, it is each in the range of also permission claims of the present invention is recorded
Kind deformation.The present invention can instantiated in a number of different manners.The disclosure should be considered that the implementation for providing the principle of the present invention
The content of mode.Understood these embodiments be not intended to limit the invention to record and/or illustrate herein it is preferred
Embodiment on the basis of, describe embodiment herein.It is not limited to the embodiment recorded herein.The present invention also wraps
Containing including key element can be recognized by one skilled in the art based on the disclosure, impartial, amendment, deletion, combination, improvement
And/or all embodiments of change.The restriction item of claims should be based on used in claims
Term is construed broadly as, and should not be limited to described embodiment in the checking process of this specification or the application.
Claims (8)
1. a kind of engine, possesses：
Cylinder cover；
Exhaust valve, it is placed in the cylinder cover；
Valve mechanism, exhaust valve is opened and closed for it；
Camshaft, it drives the valve mechanism by being contacted with the valve mechanism；
Bearing, the camshaft is supported in the cylinder cover by it in a manner of it can rotate；And
The mechanism of decompressor, it is configured between the both ends of the axis direction of the camshaft,
The mechanism of decompressor includes：
Counterweight, it is supported in the camshaft in a manner of it can be rotated between closed state and open state；
Back-moving spring, it is exerted a force in a manner of the counterweight is returned to the closed state from the open state；
Relief cam, it is provided in when the counterweight is in the closed state and contacted with the valve mechanism, is matched somebody with somebody described
Do not contacted when being in the open state again with the valve mechanism；And
Decompression pin, it connects the counterweight with the relief cam,
From the axis direction of the camshaft, the pivot of the pivot of the camshaft and the counterweight will be passed through
Straight line be set to the longitudinal axis, the straight line of pivot orthogonal with the longitudinal axis and by the camshaft is set to transverse axis, will be with
The direction of pivot towards the pivot of the counterweight in the parallel direction of the longitudinal axis from the camshaft is set to the 1st
Longitudinal direction, the 1st is set to laterally by the side in the direction parallel with the transverse axis, and the described 1st horizontal opposite direction is set into the 2nd
Laterally,
From the axis direction of the camshaft, the gravity allocation of the counterweight relative to the transverse axis in being located at the described 1st
Longitudinal direction and the 1st region for being located at the described 1st transverse direction relative to the longitudinal axis,
The counterweight includes：
1st counterweight part, its circumferentially extending from the pivot of the counterweight along the camshaft, its circumferential end is relative to institute
It is horizontal positioned at the described 1st to state the longitudinal axis；With
2nd counterweight part, its circumferentially extending from the pivot of the counterweight along the camshaft, its circumferential end is relative to institute
It is horizontal positioned at the described 2nd to state the longitudinal axis,
In the circumference of the camshaft, the 1st counterweight part than the 2nd counterweight minister,
The decompression pin is connected with the 1st counterweight part,
The opposite direction of described 1st longitudinal direction is set to the 2nd longitudinal direction,
1st counterweight part includes part 1 and part 2,
From the axis direction of the camshaft, the part 1 is configured at the 1st region,
From the axis direction of the camshaft, the part 2 is configured at relative to the transverse axis positioned at the described 2nd longitudinal direction
And it is located at the described 1st the 2nd horizontal region relative to the longitudinal axis,
From the axis direction of the camshaft, the end of the 1st counterweight part is configured at the 2nd region,
From the axis direction of the camshaft, when the counterweight is in the closed state and in open state when institute
State decompression pin and be configured at the 2nd region.
2. engine according to claim 1,
From the axis direction of the camshaft, the pivot of the counterweight is described with described the distance between the pin that depressurizes
It is more than the distance between pivot of the pivot of counterweight and the camshaft.
3. engine according to claim 1,
The camshaft includes the exhaust cam contacted with the valve mechanism,
The exhaust cam includes the nose of cam protruded outward than basic circle,
From the axis direction of the camshaft, the pivot of the counterweight leans on institute positioned at the basic circle than the exhaust cam
State the position of the inside side in footpath of camshaft.
4. engine according to claim 2,
The camshaft includes the exhaust cam contacted with the valve mechanism,
The exhaust cam includes the nose of cam protruded outward than basic circle,
From the axis direction of the camshaft, the pivot of the counterweight leans on institute positioned at the basic circle than the exhaust cam
State the position of the inside side in footpath of camshaft.
5. engine according to claim 1 or 2,
The camshaft includes the exhaust cam contacted with the valve mechanism,
The exhaust cam includes the nose of cam protruded outward than basic circle,
From the axis direction of the camshaft, the pivot of the counterweight leans on positioned at the outer peripheral face than the nose of cam
The position of the footpath of the camshaft outward.
6. engine according to any one of claim 1 to 4,
From the axis direction of the camshaft, the counterweight does not have to be configured at is located at the described 2nd relative to the transverse axis
Longitudinal direction and the part for being located at the described 2nd the 3rd horizontal region relative to the longitudinal axis.
7. engine according to any one of claim 1 to 4,
From the axis direction of the camshaft, the end of the 2nd counterweight part is configured at is located at institute relative to the transverse axis
State the 1st longitudinal direction and relative to the longitudinal axis positioned at the described 2nd the 4th horizontal region.
8. a kind of vehicle, possesses the engine any one of claim 1 to 7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-108985 | 2014-05-27 | ||
| JP2014108985A JP2015224577A (en) | 2014-05-27 | 2014-05-27 | Engine and vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105275529A CN105275529A (en) | 2016-01-27 |
| CN105275529B true CN105275529B (en) | 2018-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510271650.4A Active CN105275529B (en) | 2014-05-27 | 2015-05-25 | Engine and vehicle |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2949891B1 (en) |
| JP (1) | JP2015224577A (en) |
| CN (1) | CN105275529B (en) |
| TW (1) | TWI608161B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7124630B2 (en) * | 2018-10-19 | 2022-08-24 | スズキ株式会社 | Valve train with decompression device |
| JP7286940B2 (en) * | 2018-10-19 | 2023-06-06 | スズキ株式会社 | valve mechanism |
| TWM580123U (en) * | 2018-11-30 | 2019-07-01 | 光陽工業股份有限公司 | Decompression device of internal combustion engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0167691A2 (en) * | 1984-07-10 | 1986-01-15 | Fuji Jukogyo Kabushiki Kaisha | Decompression apparatus for engines |
| CN100507223C (en) * | 2005-02-21 | 2009-07-01 | 本田技研工业株式会社 | Engine decompression system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0267409A (en) * | 1988-08-31 | 1990-03-07 | Yamaha Motor Co Ltd | Decompressor of engine |
| JP4887200B2 (en) * | 2006-08-08 | 2012-02-29 | 本田技研工業株式会社 | Engine with decompression device |
| JP4540655B2 (en) | 2006-11-24 | 2010-09-08 | 本田技研工業株式会社 | Internal combustion engine with decompression device |
| JP2012246839A (en) * | 2011-05-27 | 2012-12-13 | Yamaha Motor Co Ltd | Internal combustion engine and motorcycle with the same |
-
2014
- 2014-05-27 JP JP2014108985A patent/JP2015224577A/en active Pending
-
2015
- 2015-04-20 EP EP15164176.8A patent/EP2949891B1/en active Active
- 2015-05-20 TW TW104116114A patent/TWI608161B/en active
- 2015-05-25 CN CN201510271650.4A patent/CN105275529B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0167691A2 (en) * | 1984-07-10 | 1986-01-15 | Fuji Jukogyo Kabushiki Kaisha | Decompression apparatus for engines |
| CN100507223C (en) * | 2005-02-21 | 2009-07-01 | 本田技研工业株式会社 | Engine decompression system |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201604382A (en) | 2016-02-01 |
| EP2949891A1 (en) | 2015-12-02 |
| EP2949891B1 (en) | 2018-06-20 |
| JP2015224577A (en) | 2015-12-14 |
| CN105275529A (en) | 2016-01-27 |
| TWI608161B (en) | 2017-12-11 |
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