CN104061040A - Decompression Mechanism Of Internal Combustion Engine - Google Patents
Decompression Mechanism Of Internal Combustion Engine Download PDFInfo
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- CN104061040A CN104061040A CN201410089635.3A CN201410089635A CN104061040A CN 104061040 A CN104061040 A CN 104061040A CN 201410089635 A CN201410089635 A CN 201410089635A CN 104061040 A CN104061040 A CN 104061040A
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Abstract
The invention provides a decompression mechanism of an internal combustion engine; and, through reduction of the number of parts, assembling precision can be improved, and cost can be suppressed. The decompression mechanism (51) of the internal combustion engine has a structure which can switch between a protruding position (P1) enabling a trace lifting portion (55) to protrude from a datum plane (25a) of an exhaust cam (25) and a retracting position (P2) enabling the trace lifting portion (55) to retract from the datum plane (25a). The decompression mechanism (51) comprises a bent steel wire portion (52) provided with the trace lifting portion (55) and a centrifugal weight portion (58) in an integrated manner, a pivot portion (65) supporting the bent steel wire portion (52) to be capable of rotating freely, and a decompression spring (68) capable of keeping the trace lifting portion (55) at the protruding position (P1) and allowing the trace lifting portion (55) to move to the retracting position (P2) by means of a centrifugal force (F) of the centrifugal weight portion (58).
Description
Technical field
The present invention relates to the mechanism of decompressor of internal-combustion engine, it can switch when make engine valve move to open and-shut mode by the cam of camshaft between the extrusion position that micro-lifting parts is given prominence to laterally than cam and the retracted position that micro-lifting parts is shunk back to the inside than cam.
Background technique
As the mechanism of decompressor of internal-combustion engine, for example known such structure: make steel wire rod be formed as curved shape and form centrifugal weight, one end of centrifugal weight (pivot) rotated and be supported on freely timing gear, make the mobile bar that is sticked in freely Rellef cam shaft of the other end (action pin) of centrifugal weight.
Specifically, in this mechanism of decompressor, one end of centrifugal weight (pivot) rotates and is supported on freely timing gear, and the other end (action pin) of centrifugal weight moves and is sticked in freely bar, and bar is radial from Rellef cam shaft and stretches out.On this Rellef cam shaft, be provided with recess.And, centrifugal weight be depressurized spring to the central side application of force of timing gear (for example,, with reference to patent documentation 1.）。
According to the mechanism of decompressor of patent documentation 1, be depressurized spring under the state of the central side application of force of timing gear at centrifugal weight, Rellef cam shaft remains the state outstanding from cam.By making Rellef cam shaft outstanding from cam, utilize thus Rellef cam shaft that push rod is carried on a little.
Thus, exhaust valve can be remained to the state of opening a little, therefore can carry out rightly the start-up function of internal-combustion engine.
On the other hand, in the time that internal-combustion engine reaches the rotating speed of regulation, centrifugal weight overcomes the elastic force of relief spring taking one end of centrifugal weight (pivot) side shifting outside axially.Therefore, the other end of centrifugal weight (action pin) is mobile, and bar rotates taking Rellef cam shaft as axle thus.By Rellef cam shaft is rotated, recess and the cam of Rellef cam shaft are opposed, and Rellef cam shaft is shunk back to the inner side of cam.
By Rellef cam shaft is shunk back to the inner side of cam, can avoid thus Rellef cam shaft on push rod, to carry.
Thus, in the time that internal-combustion engine reaches the rotating speed of regulation, can make exhaust valve and intake valve open and close reliably.
Patent documentation 1: Japanese kokai publication hei 10-159524 communique
, the mechanism of decompressor of the internal-combustion engine of patent documentation 1 needs a large amount of parts such as centrifugal weight, Rellef cam shaft, bar and relief spring.And, in this mechanism of decompressor, be formed with Rellef cam shaft is supported to the axis hole that can freely rotate and centrifugal weight is supported to the pivot hole that can freely rotate.
Owing to having used a large amount of parts in the mechanism of decompressor, therefore, because the impact of the manufacturing tolerances of all parts is difficult to the build-up tolerance of the mechanism of decompressor to be suppressed in allowed band.
And, owing to having used a large amount of parts in the mechanism of decompressor, therefore hinder the inhibition of the cost to the mechanism of decompressor.
Summary of the invention
Problem of the present invention is to provide a kind of mechanism of decompressor of internal-combustion engine, by reducing number of components, can realize the raising of assembly precision, and can suppress cost.
The invention of technological scheme 1 is the mechanism of decompressor of internal-combustion engine, in the time rotating to utilize described cam that engine valve is moved to open and-shut mode by the camshaft that makes to have cam, the mechanism of decompressor of this internal-combustion engine can be at the extrusion position that micro-lifting parts is given prominence to laterally than described cam, and switch between the retracted position that described micro-lifting parts is shunk back to the inside than described cam, the mechanism of decompressor of described internal-combustion engine is characterised in that and comprises: crooked steel wire portion, it is provided with described micro-lifting parts, and, be provided with integratedly centrifugal weight portion with described micro-lifting parts, hinge portion, it is formed with described crooked steel wire portion is supported to the pivot hole that can freely rotate, and described hinge portion is arranged at described camshaft, and relief spring, itself and described crooked steel wire portion link, and described micro-lifting parts can be remained on to described extrusion position, and can allow described micro-lifting parts to move to described retracted position by means of the centrifugal force of described centrifugal weight portion.
In the invention of technological scheme 1, on camshaft, be provided with hinge portion, make crooked steel wire portion rotate freely pivot suspension in the pivot hole of hinge portion.Trace lifting parts and centrifugal weight portion are arranged at crooked steel wire portion integratedly, and relief spring and this crooked steel wire portion link.
Therefore,, reach the rotating speed of regulation to camshaft till, can make micro-lifting parts remain on extrusion position by relief spring, thereby utilize micro-lifting parts that engine valve is moved.By utilizing micro-lifting parts that engine valve is moved, can be adjusted into and reduce cylinder compressive force.
On the other hand, by making camshaft reach the rotating speed of regulation, can make micro-lifting parts move to retracted position by means of the centrifugal force of centrifugal weight portion overcomes the elastic force of relief spring.
Like this, by making micro-lifting parts move to retracted position, can avoid by micro-lifting parts, engine valve being moved, thereby can open and close reliably engine valve.
At this, by micro-lifting parts and centrifugal weight portion are arranged to crooked steel wire portion integratedly, with being set separately respectively, micro-lifting parts compares with the situation of centrifugal weight portion, can reduce the number of components of the mechanism of decompressor.
Like this, by reducing the number of components of the mechanism of decompressor, the build-up tolerance of the mechanism of decompressor easily can be suppressed in allowed band, thereby can improve assembly precision.
And, by reducing the number of components of the mechanism of decompressor, can suppress the cost of the mechanism of decompressor.
Brief description of the drawings
Fig. 1 is the sectional view that the internal-combustion engine that possesses the mechanism of decompressor of the present invention is shown.
Fig. 2 is the stereogram that is illustrated in the concept of the valve actuating gear possessing in the mechanism of decompressor of the present invention.
Fig. 3 (a) is the stereogram that the mechanism of decompressor of Fig. 2 is shown, is (b) the 3a portion enlarged view of (a).
Fig. 4 is the exploded perspective view that the mechanism of decompressor of Fig. 3 is shown.
(a) of Fig. 5 is the side view that the mechanism of decompressor of Fig. 3 is shown, is (b) sectional view along the 5b-5b line in (a).
Fig. 6 is the figure observing along arrow 6 of 3a.
(a) of Fig. 7 is the sectional view of the state of micro-lifting parts from basal plane is shunk back that (b) that make Fig. 5 be shown, and (b) is the sectional view along the 7b-7b line in (a).
Fig. 8 is the figure that the order to assembling the mechanism of decompressor of the present invention describes.
(a) of Fig. 9 is the figure to micro-lifting parts of the present invention is described from the outstanding example of basal plane, is (b) sectional view along the 9b-9b line in (a).
Figure 10 is the figure to make example that suction port is opened a little describe by micro-lifting parts of the present invention.
(a) of Figure 11 is the figure that the example to micro-lifting parts of the present invention is shunk back from basal plane describes, and is (b) sectional view along the 11b-11b line in (a).
Label declaration
10: internal-combustion engine; 24: camshaft; 25: exhaust cam (cam); 25a: basal plane; 26: intake cam; 35: exhaust valve (engine valve); 36: intake valve; 51: the mechanism of decompressor (mechanism of decompressor of internal-combustion engine); 52: crooked steel wire portion; 55: micro-lifting parts; 58: centrifugal weight portion; 65: hinge portion; 66: pivot hole; 68: relief spring; P1: extrusion position; P2: retracted position.
Embodiment
Below, based on accompanying drawing to describing for the mode of implementing optimum of the present invention.
Embodiment
The mechanism of decompressor 51 of the internal-combustion engine to embodiment describes.
As an example, the internal-combustion engine 10 shown in Fig. 1 is motors that generator is used, and it possesses kick-starter (the manually starting arrangement of use).
As shown in Figure 1 and Figure 2, internal-combustion engine 10 possesses: the cylinder block 11 that is formed with cylinder 12; The cylinder head 14 arranging at the top of cylinder block 11; The bent axle 17 linking through connecting rod 16 and piston 13; The valve actuating gear 21 linking with bent axle 17; With the mechanism of decompressor (mechanism of decompressor of internal-combustion engine) 51 linking with valve actuating gear 21.
Valve actuating gear 21 possesses: the actuation gear 22 that is arranged at bent axle 17; The driven gear 23 engaging with actuation gear 22; The camshaft 24 of supporting driven gear 23; Be arranged at exhaust cam (cam) 25 and the intake cam 26 of camshaft 24; The exhaust jacking rod 28 contacting with basal plane (camming surface) 25a of exhaust cam 25; And the air inlet push rod 29 contacting with basal plane (camming surface) 26a of intake cam 26.
And valve actuating gear 21 possesses: the exhaust rocker arm 32 linking through exhaust push rod 31 and exhaust jacking rod 28; The intake rocker 34 linking through inlet push rod 33 and air inlet push rod 29; The exhaust valve (engine valve) 35 linking with exhaust rocker arm 32; With the intake valve 36 linking with intake rocker 34.
According to valve actuating gear 21, by bent axle 17, actuation gear 22 is rotated, camshaft 24 rotates integratedly with driven gear 23 thus.By camshaft 24 is rotated, exhaust cam 25 and intake cam 26 rotate.
By exhaust cam 25 is rotated, exhaust jacking rod 28 swings taking supporting axle 38 as fulcrum by the basal plane 25a of exhaust cam 25 on above-below direction.
Make exhaust push rod 31 liftings by the swing of exhaust jacking rod 28, by exhaust push rod 31, exhaust rocker arm 32 is moved.By exhaust rocker arm 32 is moved, exhaust valve 35 is by moving with cooperating of exhaust valve spring 41, thus switching relief opening 42.
In addition, by intake cam 26 is rotated, air inlet push rod 29 swings taking supporting axle 38 as fulcrum by the basal plane 26a of intake cam 26 on above-below direction.
Make inlet push rod 33 liftings by the swing of air inlet push rod 29, by inlet push rod 33, intake rocker 34 is moved.By intake rocker 34 is moved, intake valve 36 is by moving with cooperating of inlet-valve spring 44, thus switching suction port 45.
Camshaft 24 is formed as concavity with respect to the basal plane 25a of exhaust cam 25.In other words, the basal plane 25a of exhaust cam 25 bloats to radial direction outside from the perisporium of camshaft 24.
The mounting hole 23a of driven gear 23 is embedded in the 24a(of gear support portion of camshaft 24 with reference to Fig. 5 (a)), driven gear 23 is mounted (fixing) in the 24a of gear support portion thus.
, camshaft 24 and driven gear 23 form with the form of split.Form camshaft 24 and driven gear 23 by the form with split, the centrifugal weight portion 58 of crooked steel wire portion 52 can be set thus between driven gear 23 and hinge portion 65.
As shown in Figure 3, the mechanism of decompressor 51 has: crooked steel wire portion 52, and it is provided with straight line extension 53 and centrifugal weight portion 58 integratedly; Hinge portion 65, it is supported to crooked steel wire portion 52 can freely to rotate; Relief spring 68, itself and crooked steel wire portion 52 link; With jut 71, it is arranged at camshaft 24(with reference to Fig. 5).
As shown in Figure 4, Figure 5, about crooked steel wire portion 52, be circular steel wire rod by bending cross section, form thus straight line extension 53 and centrifugal weight portion 58.
Straight line extension 53 has: rotate axial region 54, it extends along camshaft 24, and is formed at the position of the close centrifugal weight portion 58 in straight line extension 53; With micro-lifting parts 55, it is from rotating axial region 54 to contrary with centrifugal weight portion 58 one side-prominent.
Rotating axial region 54 and micro-lifting parts 55 forms as one.
Rotate axial region 54 and be formed as circular cross-section, make to rotate freely with respect to pivot hole 66 under the state in the pivot hole 66 that is inserted into hinge portion 65.
Trace lifting parts 55 is extended at same axis towards exhaust cam 25 from one end 54a that rotates axial region 54, and a part for the perisporium of micro-lifting parts 55 is formed flatly, and thus, micro-lifting parts 55 has recess 56.
By forming recess 56 on the perisporium in micro-lifting parts 55, make thus micro-lifting parts 55 be formed as semicircular cross section.
Thus, can micro-lifting parts 55 be switched between the outstanding state of the basal plane 25a of exhaust cam 25 (with reference to Fig. 3 (b)) and state (with reference to Fig. 7 (b)) that micro-lifting parts 55 is shunk back from the basal plane 25a of exhaust cam 25.
Centrifugal weight portion 58 has the 1st curved part the 61, the 2nd curved part the 62, the 3rd curved part 63 and the 4th curved part 64 forming as one with rotation axial region 54.
The 1st curved part 61 is the upwards positions of linearly bending of the other end 54b from rotating axial region 54.The 2nd curved part 62 is towards the position that is curved shape bending the week of camshaft 24 downwards from the upper end 61a of the 1st curved part 61.
The 3rd curved part 63 is the positions that bend with downward gradient towards the perisporium of camshaft 24 from the lower end 62a of the 2nd curved part 62.The 4th curved part 64 be from the lower end 63a of the 3rd curved part 63 towards jut 71 with the position of gradient bending upwards.
The 1st curved part the 61, the 2nd curved part the 62, the 3rd curved part 63 that forms centrifugal weight portion 58 is formed as 23bYu Gai side, the side 23b along driven gear 23 respectively with the 4th curved part 64 and contacts.
For the reason that makes centrifugal weight portion 58 along 23bYu Gai side, the side 23b contact of driven gear 23, be described in detail in the back.
Position 24b from camshaft 24 is arranged to integratedly to radial direction outside protuberance in hinge portion 65, the substantial middle of this position 24b between driven gear 23 and exhaust cam 25 and be and exhaust cam 25(basal plane 25a) the contrary side of maximum protuberance 25b.
And hinge portion 65 is to the direction protuberance roughly intersecting with jut 71.
By hinge portion 65 is arranged to camshaft 24 integratedly, can in the situation that not increasing number of components, possess hinge portion 65.
Pivot hole 66 is formed at this hinge portion 65 along camshaft 24.
Pivot hole 66 forms along camshaft 24 in the mode adjacent with the perisporium of camshaft 24.Pivot hole 66 is formed as circle, thereby can run through for rotating axial region 54, and rotation axial region 54 is supported to and can be freely rotated.
This pivot hole 66 is formed as circle by the crooked position 66b of the crooked position 66a of camshaft 24 sides and the opposition side of camshaft 24.
The crooked position 66a of camshaft 24 sides is adjacent with the perisporium of camshaft 24 by being arranged to, and is formed on and the opposed position of side 25c of exhaust cam 25.
The crooked position 66b of the opposition side of camshaft 24 is by being arranged on the position that outside is left from the perisporium of camshaft 24 to radial direction, and is formed at the position by radial direction outside than exhaust cam 25.
The rotation axial region 54 of crooked steel wire portion 52 is rotated and is supported on freely pivot hole 66.Under this state, micro-lifting parts 55 is configured between hinge portion 65 and exhaust cam 25, and centrifugal weight portion 58 is configured between hinge portion 65 and driven gear 23.
In addition, centrifugal weight portion 58 is arranged on the opposition side of jut 71, and when positive observation, the mode that the 1st～4th curved part 61～64 extends round about with the sense of rotation with respect to exhaust cam 25 (arrow A direction) is bent into roughly C word shape.
And, rotate axial region 54 at the 52(of crooked steel wire portion) be supported under the state of pivot hole 66, centrifugal weight portion 58 is along the side 23b contact of driven gear 23, and the end 55a of micro-lifting parts 55 and the side 25c of exhaust cam 25 contact.
Therefore, can pass through driven gear 23(side 23b) and exhaust cam 25(side 25c) constraint crooked steel wire portion 52 is along the movement of the axial direction (, thrust direction) of camshaft 24.
Thus, rotation axial region 54 is retained rotation and supports freely (pivot suspension) in the state of pivot hole 66.
Like this, by utilizing driven gear 23 and exhaust cam 25 to retrain the movement of crooked steel wire portion 52 along thrust direction, thus, for retraining the parts of crooked steel wire portion 52 along the movement of thrust direction, can suppress the increase of number of components without preparing separately.
At this, be provided with integratedly (rotating axial region 54, micro-lifting parts 55) and centrifugal weight portion 58 in crooked steel wire portion 52.Thus, compare with the situation of centrifugal weight portion with micro-lifting parts is set separately respectively, can reduce the number of components of the mechanism of decompressor 51.
Like this, by reducing the number of components of the mechanism of decompressor 51, can easily the build-up tolerance of the mechanism of decompressor 51 be suppressed in allowed band, thereby can realize the raising of assembly precision.
And, by reducing the number of components of the mechanism of decompressor 51, can suppress the cost of the mechanism of decompressor 51.
As shown in Figure 5, Figure 6, relief spring 68 is disposed between hinge portion 65 and centrifugal weight portion 58 by the other end 54b side that is arranged on rotation axial region 54.
In addition, one end 68a engaging of relief spring 68 is in camshaft 24.And the other end 68b of relief spring 68 is inserted into the 58(of centrifugal weight portion the 1st curved part 61) engaging hole 74 in, thus, the other end 68b engaging of relief spring 68 is in the 1st curved part 61.
Thus, crooked steel wire portion 52 is depressurized the elastic force application of force of spring 68, thereby rotates along arrow B direction centered by rotating axial region 54.By utilizing relief spring 68 to crooked steel wire portion 52 application of forces, thus, in the time that camshaft 24 rotates to be less than the rotating speed of regulation along arrow A direction, the 3rd curved part 63 keeps the state (with reference to Fig. 5 (b)) contacting with camshaft 24.
The application of force direction (, arrow B direction) of crooked steel wire portion 52 is directions contrary with the sense of rotation (arrow A direction) of camshaft 24.
At this, as shown in Figure 3, the state that is keeping contacting with camshaft 24 by relief spring 68 at the 3rd curved part 63 of crooked steel wire portion 52, micro-lifting parts 55 can be remained from the basal plane 25a of exhaust cam 25 with the outstanding state of small overhang S (also with reference to Fig. 5 (a)).
Below, micro-lifting parts 55 is described as extrusion position P1 from the outstanding position of the basal plane 25a of exhaust cam 25., can utilize the elastic force of relief spring 68 that micro-lifting parts 55 is remained on to extrusion position P1.
On the other hand, as shown in Figure 7, by camshaft 24 is rotated with the rotating speed that is not less than regulation along arrow A direction, thus, centrifugal force F acts on the centrifugal weight portion 58 of crooked steel wire portion 52.Because centrifugal force F acts on centrifugal weight portion 58, the elastic force that therefore centrifugal weight portion 58 overcomes relief spring 68 moves to the direction of leaving camshaft 24.
By centrifugal weight portion 58 is moved to the direction of leaving camshaft 24, rotate axial region 54 and rotate along arrow C direction.Rotate along arrow C direction by making to rotate axial region 54, micro-lifting parts 55 is rotated along arrow C direction.
By micro-lifting parts 55 is rotated along arrow C direction, the 1st curved part 61 is retained as the state contacting with jut 71.Under the state contacting with jut 71 at the 1st curved part 61, can make the recess 56 of micro-lifting parts 55 towards the radial direction outside of camshaft 24.
Thus, micro-lifting parts 55 can be remained to the state of shrinking back from the basal plane 25a of exhaust cam 25.
Below, the position that the basal plane 25a using micro-lifting parts 55 from exhaust cam 25 shrinks back to the inside describes as retracted position P2., the elastic force of relief spring 68 is set to: can allow micro-lifting parts 55 to move to retracted position P2 by means of the centrifugal force of centrifugal weight portion 58.
As shown in Figure 5, Figure 6, jut 71 from camshaft 24, between driven gear 23 and hinge portion 65 and the position 24c adjacent with driven gear 23 outstanding to radial direction outside.
This jut 71 is so that crooked steel wire portion 52 is positioned to retracted position P2(with reference to Fig. 7) the retainer that arranges along the direction of roughly intersecting with hinge portion 65 of mode.
As mentioned above, the mechanism of decompressor 51 is configured to and can between extrusion position P1 and retracted position P2, switches crooked steel wire portion 52.
Extrusion position P1 makes micro-lifting parts 55 than exhaust cam 25(basal plane 25a) position of outstanding small overhang S to radial direction outside.Retracted position P2 makes micro-lifting parts 55 than exhaust cam 25(basal plane 25a) position of shrinking back to the inside.
Next, based on Fig. 8, the order of the assembling mechanism of decompressor 51 is described.
As shown in Figure 8, as arrow D, the straight line extension 53 of crooked steel wire portion 52 is inserted in the pivot hole 66 of hinge portion 65.By straight line extension 53 is inserted in pivot hole 66, make thus the micro-lifting parts 55 of straight line extension 53 side-prominent to exhaust cam 25 from pivot hole 66, and the rotation axial region 54 of straight line extension 53 is rotated and is supported on freely pivot hole 66.
Rotation axial region 54 is being rotated and is being supported on freely after pivot hole 66, as arrow E, making the mounting hole 23a of driven gear 23 be embedded in the 24a of gear support portion of camshaft 24.By making mounting hole 23a be embedded in the 24a of gear support portion, thus driven gear 23 is installated (fixed) in to the 24a of gear support portion.
Thus, the centrifugal weight portion 58 of crooked steel wire portion 52 can be assembled between driven gear 23 and hinge portion 65.
Next, based on Fig. 9～Figure 11 and Fig. 2, the action of the mechanism of decompressor 51 is described.
As shown in the (a) and (b) of Fig. 9, camshaft 24 is rotated as arrow A with the rotating speed that is not less than regulation.Under this state, crooked steel wire portion 52 is depressurized spring 68 along the arrow B direction application of force, and thus, the 3rd curved part 63 is maintained at the extrusion position P1 contacting with camshaft 24.
At this, be held in crooked steel wire portion 52 under the state of extrusion position P1, micro-lifting parts 55 is outstanding laterally from the basal plane 25a of exhaust cam 25.
As shown in figure 10, micro-lifting parts 55 is from the outstanding small overhang S of basal plane 25a of exhaust cam 25.Therefore, to be not more than rotating speed when rotation of regulation, can make the exhaust jacking rod 28 small overhang S that rises at camshaft 24 by micro-lifting parts 55.
By making exhaust jacking rod 28 increase, can utilize exhaust push rod 31 to make exhaust rocker arm 32(with reference to Fig. 2) move.
As shown in Figure 2, by exhaust rocker arm 32 is moved, can utilize exhaust rocker arm 32 that exhaust valve 35 is moved, thereby relief opening 42 is opened a little.
Thus, can adjust in the mode of the cylinder compressive force of reduction internal-combustion engine 10, thereby can carry out rightly the start-up function of internal-combustion engine 10.
Particularly, in the time using kick-starter manual starting internal-combustion engine 10, can carry out rightly the start-up function of internal-combustion engine 10.
As shown in the (a) and (b) of Figure 11, by camshaft 24 is rotated with the rotating speed that is not less than regulation as arrow A, centrifugal force F acts on the centrifugal weight portion 58 of crooked steel wire portion 52 thus.
Because centrifugal force F acts on centrifugal weight portion 58, the elastic force that therefore centrifugal weight portion 58 overcomes relief spring 68 moves to the direction of leaving camshaft 24, micro-lifting parts 55 with rotate axial region 54 and rotate along arrow C direction integratedly.
By micro-lifting parts 55 is rotated along arrow C direction, the 1st curved part 61 contacts with jut 71 and crooked steel wire portion 52 is remained on to retracted position P2.By crooked steel wire portion 52 is remained on to retracted position P2, micro-lifting parts 55 can be remained to the state of shrinking back from the basal plane 25a of exhaust cam 25.
Therefore, can make the exhaust jacking rod 28 can be by micro-lifting parts 55(with reference to Figure 10) rise, thus exhaust valve 35 can not moved by micro-lifting parts.
Thus, can in the time that reaching the rotating speed of regulation, camshaft 24 open and close reliably exhaust valve 35 and intake valve 36(with reference to Fig. 2).
And the mechanism of decompressor of internal-combustion engine of the present invention is not limited to aforesaid embodiment, can suitably change, improvement etc.
For example, in described embodiment, as internal-combustion engine 10, the motor of using exemplified with generator, but be not limited to this, also the mechanism of decompressor 51 of the present invention can be applied to the motor using in other devices such as supervisor or snow breaker.
In addition, in described embodiment, the example that utilizes the micro-lifting parts 55 of the mechanism of decompressor 51 that exhaust cam 25 is moved is illustrated, but is not limited to this, the top that also camshaft 24 can be arranged to cylinder 12, utilizes micro-lifting parts 55 directly to make exhaust rocker arm 32 move.
And, in described embodiment, to the mechanism of decompressor 51 is applied to exhaust cam 25(, exhaust valve 35) example be illustrated, but be not limited to this, also the mechanism of decompressor 51 can be applied to exhaust cam 25 and intake cam 26 both sides.
In addition, shape or structure at the internal-combustion engine 10 shown in described embodiment, camshaft 24, exhaust cam 25, exhaust valve 35, the mechanism of decompressor 51, crooked steel wire portion 52, micro-lifting parts 55, centrifugal weight portion 58, hinge portion 65, pivot hole 66 and relief spring 68 etc. are not limited to illustrative situation, can carry out suitable change.
Utilizability in industry
The present invention is applicable to possess the internal-combustion engine of following such mechanism of decompressor: in the time that the cam that utilizes camshaft makes engine valve move to open and-shut mode, this mechanism of decompressor can switch micro-lifting parts between extrusion position and retracted position.
Claims (1)
1. the mechanism of decompressor of an internal-combustion engine, in the time rotating to utilize described cam that engine valve is moved to open and-shut mode by the camshaft that makes to have cam, the mechanism of decompressor of this internal-combustion engine can switch between the extrusion position that micro-lifting parts is given prominence to laterally than described cam and the retracted position that described micro-lifting parts is shunk back to the inside than described cam
The mechanism of decompressor of described internal-combustion engine is characterised in that and comprises:
Crooked steel wire portion, it is provided with described micro-lifting parts, and, be provided with integratedly centrifugal weight portion with described micro-lifting parts;
Hinge portion, it is formed with described crooked steel wire portion is supported to the pivot hole that can freely rotate, and described hinge portion is arranged at described camshaft; With
Relief spring, itself and described crooked steel wire portion link, and described micro-lifting parts can be remained on to described extrusion position, and can allow described micro-lifting parts to move to described retracted position by means of the centrifugal force of described centrifugal weight portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013054717A JP6109610B2 (en) | 2013-03-18 | 2013-03-18 | Decompression mechanism of internal combustion engine |
| JP2013-054717 | 2013-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104061040A true CN104061040A (en) | 2014-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410089635.3A Pending CN104061040A (en) | 2013-03-18 | 2014-03-12 | Decompression Mechanism Of Internal Combustion Engine |
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| JP (1) | JP6109610B2 (en) |
| CN (1) | CN104061040A (en) |
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2013
- 2013-03-18 JP JP2013054717A patent/JP6109610B2/en not_active Expired - Fee Related
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2014
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| CN1188184A (en) * | 1996-11-29 | 1998-07-22 | 本田技研工业株式会社 | Decompression mechanism in engine |
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| US20040094110A1 (en) * | 2002-11-15 | 2004-05-20 | Wolf Burger | Automatic decopmression device for valve-controlled internal combustion engines |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2014181565A (en) | 2014-09-29 |
| JP6109610B2 (en) | 2017-04-05 |
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