CN101713352A - Carburetor and automatic choke assembly for an engine - Google Patents
Carburetor and automatic choke assembly for an engine Download PDFInfo
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- CN101713352A CN101713352A CN200810178887A CN200810178887A CN101713352A CN 101713352 A CN101713352 A CN 101713352A CN 200810178887 A CN200810178887 A CN 200810178887A CN 200810178887 A CN200810178887 A CN 200810178887A CN 101713352 A CN101713352 A CN 101713352A
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Abstract
A carburetor configured for use with an internal combustion engine includes a body defining a passageway therein, a throttle lever including a cam surface, and a throttle valve positioned in the passageway and responsive to movement of the throttle lever. The throttle valve is configured to rotate about a first axis from a wide-open first position to a second position at least 50 degrees from the first position. The carburetor also includes a choke lever including a follower surface configured to be engaged by the cam surface and a choke valve positioned in the passageway and responsive to movement of the choke lever. One of the cam surface and the follower surface includes an arcuate segment having a constant radius centered on a second axis. The arcuate segment is sufficiently long such that the throttle valve is configured to move at least 15 degrees while the other of the cam surface and the follower surface engages the arcuate segment.
Description
The patent application cross reference of being correlated with
The application's request David Roth is called in the name of application on December 6th, 2007 " CARBURETOR AND AUTOMATIC CHOKE AS SEMBLY FOR ANENGINE " (" engine vaporizer and automatic choke assembly ") common unsettled U.S. Patent Application Serial Number No.60/992,866 preference, its whole disclosures are incorporated into this by reference.
Background of invention
In using the compact internal combustion engine of vaporizer, be used in motor in the outdoor power equipment (lawnmower for example, snowblower, or the like) such as those, the cold-starting of motor typically needs the mixture of the air-fuel of fuel-abundance to keep combustion reaction.In some motors, this finishes by closing choke valve, thereby has partly stopped cylinder or the cylinder block of air supply to motor.Along with the intensification of motor, because the temperature that raises in the motor helps to have kept combustion reaction, no longer needed choker, and therefore choker is opened and allows more air enter combustion cylinders or cylinder block.
Some vaporizers that are used for compact internal combustion engine comprise gate footstep lever, or directly or via connecting rod be attached to choke valve on the choke bar of actuating choke valve engage.Regulator is used for activating gate footstep lever typically and is attached to the speed that throttler valve on the gate footstep lever is controlled motor.
Summary of the invention
One aspect of the present invention provides a kind of vaporizer that is used for internal-combustion engine, comprises the main body that wherein defines passage, comprises the gate footstep lever of cam face and be arranged in passage and respond the throttler valve of the motion of gate footstep lever.Throttler valve is configured to rotate to apart from the second place of primary importance at least 50 degree around first axle from the primary importance of fully opening.Vaporizer also comprises: the choke bar, comprising the servo-actuated surface that is configured to cam; And choke valve, it is arranged in passage and responds the motion of choke bar.One of them of cam face and servo-actuated surface comprises bow-shaped section, and it has with second axis is the constant radius at center.The bow-shaped section long enough makes that throttler valve can move at least 15 degree when another joint bow-shaped section in cam face and the servo-actuated surface.
One aspect of the present invention provides a kind of vaporizer that is used for internal-combustion engine.Vaporizer comprises the main body that defines passage, comprises the gate footstep lever of cam face and is arranged in passage and respond the throttler valve of the motion of gate footstep lever.Throttler valve is configured to rotate to apart from the second place of primary importance at least 50 degree around first axle from the primary importance of fully opening.Vaporizer also comprises: the choke bar, comprising the servo-actuated surface that is configured to cam; And choke valve, it is arranged in passage and responds the motion of choke bar.Cam face comprises the bow-shaped section of barrel surface, or to have with second axis be the bow-shaped section of the constant radius at center.The bow-shaped section long enough makes that throttler valve can move at least 15 degree when the bow-shaped section of servo-actuated surface engagement cam face.
Vaporizer of the present invention is in order to be used for outdoor power equipment, and it is designed to move under variable velocity and variable load.By providing bow-shaped section on the cam face for vaporizer of the present invention, the reaction torque that the choke bar produces on gate footstep lever can be reduced substantially, or eliminated substantially under throttler valve position and the engine speed on a large scale, thereby stoped regulator excessive to the control of gate footstep lever under large-scale throttler valve position and engine speed basically.But it is powered device with the motor that vaporizer of the present invention also can be used for other, and it is designed in basicly stable speed and load (as generator) operation down.
Other features of the present invention and aspect can be by becoming clear in conjunction with ensuing introduction and accompanying drawing.
Description of drawings
Fig. 1 is the top perspective of first kind of structure of vaporizer of the present invention.
Fig. 2 is the plan view of the vaporizer of Fig. 1, shows gate footstep lever and is positioned at the fully open position of primary importance with corresponding throttler valve.
Fig. 3 is the plan view of the vaporizer of Fig. 1, shows gate footstep lever and is positioned at the first portion closed position of the second place with corresponding throttler valve.
Fig. 4 is the plan view of the vaporizer of Fig. 1, shows gate footstep lever and is positioned at the second portion closed position of the 3rd position with corresponding throttler valve.
Fig. 5 is the plan view of the carburetor throttle bar of Fig. 1.
Fig. 6 is the top perspective of second kind of structure of vaporizer of the present invention.
Fig. 7 is the plan view of the vaporizer of Fig. 6, shows gate footstep lever and is positioned at the fully open position of primary importance with corresponding throttler valve.
Fig. 8 is the plan view of the vaporizer of Fig. 6, shows gate footstep lever and is positioned at the first portion closed position of the second place with corresponding throttler valve.
Fig. 9 is the plan view of the vaporizer of Fig. 6, shows gate footstep lever and is positioned at the second portion closed position of the 3rd position with corresponding throttler valve.
Figure 10 is the plan view of the carburetor throttle bar of Fig. 6.
Figure 11 is the top perspective of the third structure of vaporizer of the present invention.
Figure 12 is the plan view of the vaporizer of Figure 11, shows gate footstep lever and is positioned at the fully open position of primary importance with corresponding throttler valve.
Figure 13 is the plan view of the vaporizer of Figure 11, shows gate footstep lever and is positioned at the first portion closed position of the second place with corresponding throttler valve.
Figure 14 is the plan view of the vaporizer of Figure 11, shows gate footstep lever and is positioned at the second portion closed position of the 3rd position with corresponding throttler valve.
Figure 15 is the plan view of the carburetor throttle bar of Figure 11.
Figure 16 is the top perspective of the 4th kind of structure of vaporizer of the present invention.
Figure 17 is the top perspective that the vaporizer of Figure 16 turns around.
Figure 18 is the plan view of the vaporizer of Figure 16, shows gate footstep lever and is positioned at the fully open position of primary importance with corresponding throttler valve.
Figure 19 is the plan view of the vaporizer of Figure 16, shows gate footstep lever and is positioned at the first portion closed position of the second place with corresponding throttler valve.
Figure 20 is the plan view of the vaporizer of Figure 16, shows gate footstep lever and is positioned at the second portion closed position of the 3rd position with corresponding throttler valve.
Figure 21 is the top perspective of the 5th kind of structure of vaporizer of the present invention.
Figure 22 is the top perspective that the vaporizer of Figure 21 turns around.
Figure 23 is the plan view of the vaporizer of Figure 21, shows gate footstep lever and is positioned at the fully open position of primary importance with corresponding throttler valve.
Figure 24 is the plan view of the vaporizer of Figure 21, shows gate footstep lever and is positioned at the second place and closes the position with first portion's point of corresponding throttler valve.
Figure 25 be Figure 21 the plan view of vaporizer, show gate footstep lever and be positioned at the second portion closed position of the 3rd position with corresponding throttler valve.
Figure 26 is the top perspective of the 6th kind of structure of vaporizer of the present invention.
Figure 27 is the plan view of the vaporizer of Figure 26, shows gate footstep lever and is positioned at the fully open position of primary importance with corresponding throttler valve.
Figure 28 is the plan view of the vaporizer of Figure 26, shows gate footstep lever and is positioned at the first portion closed position of the second place with corresponding throttler valve.
Figure 29 is the plan view of the vaporizer of Figure 26, shows gate footstep lever and is positioned at the second portion closed position of the 3rd position with corresponding throttler valve.
Figure 30 is the plan view of the carburetor throttle bar of Figure 26.
Embodiment
Before at length explaining any embodiment of the present invention, be to be understood that to the invention is not restricted to its detailed construction and element setting in ensuing specification or the application of drawn proposition in ensuing accompanying drawing.The present invention can have other embodiments and can or finish by various different modes practices.The purpose that it is also to be understood that phraseology and terminology used in this is should not be understood that limited tailor-made usefulness in order to introduce." comprise " that in this use the meaning of " comprising " or " having " and modification thereof is the article of listing thereafter will be included with its equivalent transformation and extra article.Unless otherwise mentioned or limit, term " installations " " connections " " supports " and " connection " and modification thereof all are the direct and indirect installations of broadly using and include, connection, support and connection.In addition, " connection " and " connection " be not limited to physics or being connected or connection of machinery.
Fig. 1-4 shows first kind of structure of the vaporizer 10 that is used for mini engine.Such motor can be used in the outdoor power equipment (as lawnmower, snowblower, or the like) or other types are (as generator) in the powered device with the motor.Vaporizer 10 comprises main body 14, and it defines air/fuel passage 18 along central axis 22.Vaporizer 10 also comprises the throttler valve 26 that is arranged in passage 18, and is attached to gate footstep lever 30 on the throttler valve 26 via solar term door handle 34.Throttler valve 26, solar term door handle 34 and gate footstep lever 30 can around with the central axis 22 of passage 18 roughly the axis 38 of quadrature pivot.Continuation is referring to Fig. 1-4, and vaporizer 10 also comprises the choke valve 42 that is arranged in passage 18, and is attached to choke bar 46 on the choke valve 42 via choke handle 50.Choke valve 42, choke handle 50 and choke bar 46 also can around with the central axis 22 of passage 18 roughly the axis 54 of quadrature pivot.
Referring to Fig. 2-4, gate footstep lever 30 comprises the arm 58 that is attached to engine controller bar (not shown), and another element of regulator activates opening and closing throttler valve 26 in its optionally launched again machine.In the structure of the gate footstep lever 30 that illustrates, arm 58 comprises that hole 62 comes the connection of auxiliary governor bar and gate footstep lever 30 (as passing through fastening piece).Alternatively, arm 58 can be attached on the governor lever by in a large amount of different modes any one.
Referring to Fig. 1, gate footstep lever 30 also comprises block 66, and it is configured to engage with the different piece of main body 14 degree with the opening and closing of restriction throttler valve 26.In a kind of structure of vaporizer 10, block 66 can engage the unlatching with restriction throttler valve 26 with the jut 70 on the vaporizer 10.Block 66 also can with the screw fit of shooting main body 10 parts with the restriction throttler valve 26 closure.The size of jut 70 and position can be set as the opening of throttler valve 26 can be restricted to from central axis 22 plane orthogonal 74 with passage 18 and measure the closure angle A1 (seeing Fig. 2) that is about 90 degree.In other words, the size of jut 70 and position can be set as and the opening of throttler valve 26 can be restricted on the substantially parallel direction of throttler valve 26 and central axis 22.On this position, throttler valve 26 " is fully opened " or is opened fully, allows the air communication of maximum flow to cross passage 18.Screw can be adjusted with respect to main body 14, for example, the closure of throttler valve 26 is restricted to from the plane 74 measures the closure angle A2 (just count " closures " of about 75 degree, see Fig. 4) that are about 15 degree from the fully open position of throttler valve shown in Figure 2 26.The optional structure of vaporizer 10 can be utilized any opening and closing that limit throttler valve 26 in a large amount of different structures and the element.
Referring to Fig. 1-4, choke bar 46 comprises the arm 78 that is attached on the push element (as spring 82).Arm 78 comprises hole 86, and the part of spring 82 was inserted wherein spring 82 and arm 78 are tied.Arm 78 is positioned at and makes on the choke bar 46 that spring 82 applies moment of torsion in the counterclockwise direction around axis 54 on choke bar 46, as shown in Fig. 2-4, choke valve 42 is pushed to operating position.Choke bar 46 can comprise another arm (not shown), and it is attached to optionally can operate on the heat-conductive assembly and choke bar 46 kept or maintains the position that choke valve 42 is opened fully.Such heat-conductive assembly is in U.S. Patent No. 6,990, and is open in 969, and its whole disclosures are by with reference to being incorporated into this.
Referring to Fig. 2-4, gate footstep lever 30 comprises cam face 90, and it engages with the servo-actuated surface 94 of choke bar 46.Shown in the best among Fig. 5, cam face 90 comprises bow-shaped section 98, and it has with axis 102 is the constant radius R at center, and its medial axis 102 is substantially parallel with the axis 38 of gate footstep lever 30.In the structure that illustrates, axis 102 is coaxial with the axis 38 of gate footstep lever 30, makes be applied to the axis 38 that reaction force vector on the cam face 90 passed or intersected at gate footstep lever 30 along bow-shaped section 98 any some places by servo-actuated surface 94.This vector also is orthogonal to the straight line that is tangential to cam face 90 and servo-actuated surface 94 at this some place of bow-shaped section 98.
Referring to Fig. 3, bow-shaped section first terminal 106 overlaps substantially with throttler valve angle (the throttle valve angle) A3 of decentre axis 22 about 47 degree.In other words, be about 47 when spending when throttler valve 26 moves to the throttler valve angle from the position that throttler valve 26 is as shown in Figure 2 opened fully, servo-actuated surface 94 with the first terminal 106 position engage cam surfaces 90 that overlap of bow-shaped section 98.Referring to Fig. 4, bow-shaped section 98 second terminal 110 overlaps substantially with the throttler valve angle A4 of decentre axis 22 about 75 degree.In other words, be about 75 when spending when throttler valve 26 moves to the throttler valve angle from the position that throttler valve 26 is as shown in Figure 2 opened fully, servo-actuated surface 94 with the second terminal 110 position engage cam surfaces 90 that overlap of bow-shaped section 98.Like this, servo-actuated surface 94 engages in the about 28 degree scopes of throttler valve opening with bow-shaped section 98, from the position of the throttler valve shown in Fig. 3 26 to the position of the throttler valve shown in Fig. 4 26.Alternatively, the bow-shaped section 98 of cam face 90 can comprise than the shorter length shown in Fig. 5, and servo-actuated surface 94 engages about 28 degree that can be less than the throttler valve opening with bow-shaped section 98 like this, spends but be at least 15.In addition, the bow-shaped section 98 of cam face 90 can comprise than the longer length shown in Fig. 5, and servo-actuated surface 94 engages to understand greater than about 28 of throttler valve opening with bow-shaped section 98 and spends like this.
In the optional structure of vaporizer 10, the axis 102 of constant radius R can slightly depart from the axis 38 of gate footstep lever 30.The result is that servo-actuated surface 94 is not all intersecting at the axis 38 of gate footstep lever 30 along the vector that is applied to the reaction force on the cam face 90 on bow-shaped section 98 any points, but is positioned near the axis 38 of gate footstep lever 30.Such structure can cause reaction torque less but that can tolerate to be applied on the gate footstep lever 30 (for example, being no more than about 10 inches grams), its can substantial interference to the operation of regulator.
In the motor of the vaporizer that combines Fig. 1-4, gate footstep lever 30 is conditioned device bar or push element (as return spring) thereby towards the pushing of the position as shown in Fig. 2 throttler valve 26 is directed to the position of fully opening or opening fully with the preparation as engine cold starting.In addition, thus choke bar 46 is directed to closed position with preparation as engine cold starting towards the position shown in Fig. 2 pushing with choke valve 42 by spring 82.After motor one starting, regulator just activates governor lever moves gate footstep lever 30 in the counterclockwise direction, as shown in Fig. 3 and 4, thereby gate footstep lever 30 is moved to certain location or throttler valve angle to realize the expectation no-load running speed of motor.In the structure of vaporizer 10,, reached the expectation no-load running speed of motor shown in figure 2 by throttler valve 26 is moved to the position that is about 75 degree from the position that the throttler valve shown in Fig. 2 26 is opened fully.Alternatively, vaporizer 10 can be configured such that in the expectation no-load running speed that reaches motor corresponding to cam face 90 and servo-actuated surface 94 at the place, throttler valve angle along any engagement position of bow-shaped section 98.
Referring to Fig. 2-4, when gate footstep lever 30 when position shown in its Fig. 2 is pivoted to position shown in its Fig. 4, gate footstep lever 30 applies the active force of opening choke valve 42 on choke bar 46.As previously mentioned, spring 82 is pressed to choke bar 46 on the position that makes choke valve 42 closures (seeing Fig. 2).As a result, choke bar 46 applies reaction force along being tangential to both normal vectors of straight line of cam face 90 and servo-actuated surface 94 on gate footstep lever 30.When axis 38 misalignment of reaction force and gate footstep lever 30, reaction force produces reaction torque on gate footstep lever 30.Fig. 5 shows the scope at the joining portion 114 on cam face 90 and servo-actuated surface 94, and along this joining portion 114, reaction force can not be aimed at the axis 38 of gate footstep lever 30.The amount of reaction torque depends on the geometrical shape of gate footstep lever 30 and choke bar 46 and the spring rate of spring 82.
But referring to Fig. 3 and 4, the constant radius R of bow-shaped section 98 has guaranteed can be aimed at or intersect at by the vector that servo-actuated surface 94 is applied to the reaction force on the cam face 90 axis 38 of gate footstep lever 30.The result is, be applied on the cam face 90 reaction force can produce on the gate footstep lever 30 corresponding reaction torque not hinder or influence gate footstep lever 30 on cam face 90 and servo-actuated surface 94 move (the seeing Fig. 5) in the joining portion scope of bow-shaped section 98.By basic elimination on cam face 90 and servo-actuated surface 94 in the joining portion scope of bow-shaped section 98 reaction torque on gate footstep lever 30, vaporizer 10 can be constructed to be permeable to provide the large-scale selected expectation no-load running speed of motor, in this scope, the interference that the regulator of gate footstep lever 30 is controlled is minimized or avoids.In addition, but gate footstep lever 30 responding engines load on cam face 90 and move in the joining portion scope of bow-shaped section 98 in servo-actuated surface 94, and the reaction force that can not imposed on gate footstep lever 30 by choke bar 46 interferes with the control of regulator to gate footstep lever 30.
After the engine start, heat-conductive assembly is actuatable to break away from choke bar 46 and gate footstep lever 30 with further pivot choke bar 46, and choke bar 46 is maintained the position that choke valve 42 is opened fully.Restart in engine thermal in (hot-restart) process, heat-conductive assembly can keep activating choke valve 42 is maintained on its position of opening fully.
Figure 26-29 show the vaporizer 10 similar to the vaporizer 10 shown in Fig. 1-4 '.Same element adds main symbol, and introduces no longer in detail with same reference numbers sign.But,, just engage choke bar 46 ' and make choke bar 46 ' around its axis 54 ' rotate in the counterclockwise direction to open choke valve 42 ' (27-29 with the aid of pictures) when gate footstep lever 30 ' around 26 ' time of the rotating closed throttler valve of its axis 38 ' clockwise direction.Like this, gate footstep lever 30 ' just be configured to the direction rotation opposite with gate footstep lever 30 with closed throttler valve 26 ', and choke bar 46 ' be configured to the direction rotation opposite with choke bar 46 with open choke valve 42 '.As shown in Figure 30, the mirror image of the gate footstep lever 30 drawn among Fig. 5 of gate footstep lever 30 ' be.
Fig. 6-9 shows second kind of structure of the vaporizer 118 that is configured for mini engine.Same element adds letter " a ", and introduces no longer in detail with same reference numbers sign.The operation of vaporizer 118 is similar substantially to the vaporizer 10 shown in Fig. 1-4.But, the shape of cam face 90a in the joining portion 114a scope of cam face 90a and servo-actuated surface 94a has produced and (has for example constructed the different reaction torque curve of resulting curve from Fig. 1-5 gate footstep lever 30a, reaction torque is to the throttler valve angle), along cam face 90a, the axis 38a misalignment of reaction force and gate footstep lever 30a (promptly the fully open position of throttler valve 26a and and the throttler valve angle A5s of central axis 22a into about 40 degree between; See Fig. 8).In addition, the length of bow-shaped section 98a makes servo-actuated surface 94a engage in the throttler valve opening scope of about 35 degree with bow-shaped section 98a, from the position of the throttler valve 26a shown in Fig. 8 to the position of the throttler valve 26a shown in Fig. 9, about 75 degree of the throttler valve angle A6 that throttler valve 26a is become with central axis 22a among Fig. 9.
Figure 11-14 shows the third structure of the vaporizer 122 that is configured for mini engine.Same element adds letter " b ", and introduces no longer in detail with same reference numbers sign.The vaporizer 10,118 shown in the difference is similar substantially among the operation of vaporizer 118 and Fig. 1-4 and Fig. 6-9.But, the shape of cam face 90b in the joining portion 114b scope of cam face 90b and servo-actuated surface 94b has produced and (has for example constructed the different reaction torque curve of resulting curve from Fig. 1-5 gate footstep lever 30b, reaction torque is to the throttler valve angle), along cam face 90b, the axis 38b misalignment of reaction force and gate footstep lever 30b (promptly the fully open position of throttler valve 26b and and the throttler valve angle A7s of central axis 22b into about 47 degree between; See Figure 13).In addition, the length of bow-shaped section 98b makes servo-actuated surface 94b engage in the throttler valve opening scope of about 28 degree with bow-shaped section 98b, from the position of the throttler valve 26b shown in Figure 13 to the position of the throttler valve 26b shown in Figure 14, about 75 degree of the throttler valve angle A8 that throttler valve 26b is become with central axis 22b among Figure 14.
Figure 16-20 shows the 4th kind of structure of the vaporizer 126 that is configured for mini engine.Vaporizer 126 comprises main body 130, and it defines air/fuel passage 134 along central axis 138.Vaporizer 126 also comprises the throttler valve 142 that is arranged in passage 134 and is attached to gate footstep lever 146 on the throttler valve 142 via solar term door handle 150.Throttler valve 142, solar term door handle 150 and gate footstep lever 146 can around with the central axis 138 of passage 134 roughly the axis 154 of quadrature pivot.Vaporizer 126 also comprises the choke valve 158 that is arranged in passage 134 and is attached to choke bar 162 on the choke valve 158 via choke handle 166.Choke valve 158, choke handle 166 and choke bar 162 also can around with the central axis 138 of passage 134 roughly the axis 178 of quadrature pivot.
Continuation is referring to Figure 16-20, and vaporizer 126 also comprises intermediate bar 174, its be attached on the main body 130 and can around with the central axis 138 of passage 134 roughly the axis 178 of quadrature pivot.Intermediate bar 174 comprises the first arm 182 with servo-actuated surface 186 and second arm 190 with cam face 194.The following detailed description in detail, intermediate bar 174 with the transmission of movement of gate footstep lever 146 to the choke bar 162 with mobile choke valve 158.Intermediate bar 174 also can be attached to and optionally can carry out intermediate bar 174 on the heat-conductive assembly and and then choke bar 162 kept or maintain the locational operation that choke valve 158 is opened fully.Such heat-conductive assembly is in U.S. Patent No. 6,990, and is open in 969, and its whole disclosures are by with reference to being incorporated into this.
Referring to Figure 18-20, gate footstep lever 146 comprises the arm 202 that is attached on the engine controller bar (not shown), and another element of regulator activates opening and closing throttler valve 142 in its optionally launched again machine.In the structure of the gate footstep lever 146 that illustrates, arm 202 comprises that hole 206 comes the connection of auxiliary governor bar and gate footstep lever 146 (as passing through fastening piece).Alternatively, arm 202 can be attached on the governor lever by other different modes.
Referring to Figure 16 and 17, gate footstep lever 146 also comprises block 210, and it is configured to engage with the different piece of main body 130 degree with the opening and closing of restriction throttler valve 142.In a kind of structure of vaporizer 126, block 210 can engage the opening with restriction throttler valve 142 with the jut 214 on the vaporizer 126.Block 210 also can with the screw fit of shooting main body 130 parts with the restriction throttler valve 142 closure.Jut 214 can be set as size and position and the opening of throttler valve 142 can be restricted to from measuring the closure angle A9 (seeing Figure 18) that are about 90 degree with passage 134 central axis 138 plane orthogonal 218.In other words, jut 214 can be set as size and position and the opening of throttler valve 142 can be restricted on the substantially parallel direction of throttler valve 142 and central axis 138.On this position, throttler valve 142 " is fully opened " or is opened fully, allows the air communication of maximum flow to cross passage 134.Screw can with respect to main body 130 adjust in case for example the closure of throttler valve 142 is restricted to from the plane 218 measure the closure angle A10 that are about 15 degree (that is to say, with central axis 138 into about 75 degree; See Figure 20).The optional structure of vaporizer 126 can be utilized any opening and closing that limit throttler valve 142 in a large amount of different structures and the element.
Referring to Figure 17-20, choke bar 162 comprises the arm 222 that is attached on the push element (as spring 224).Arm 222 comprises hole 226, and the part of spring 224 was inserted wherein spring 224 and arm 222 are tied.Thereby arm 222 is positioned at the axis 170 of spring 224 winding gas bars 162 on the choke bar 162 applies moment of torsion in the counterclockwise direction on choke bar 162, as shown in Figure 18-20, choke valve 158 is pushed to operating position.
Referring to Figure 19 and 20, gate footstep lever 146 also comprises cam face 230, and it engages with servo-actuated surface 186 on intermediate bar 174 the first arms 182.In the structure of the vaporizer 126 that illustrates, cam face 230 is positioned on the bump 234 that erects from gate footstep lever 146 (seeing Figure 16 and 17).Alternatively, cam face 230 can by with the gate footstep lever 30 of Fig. 1-15,30a, 30b cam face 90 separately, 90a, the similar mode of 90b directly is positioned on the gate footstep lever 146.Shown in Figure 19 and 20, choke bar 162 comprises servo-actuated surface 236, and it engages with cam face 194 on intermediate bar 174 second arms 190.
Continuation is referring to Figure 19 and 20, and the servo-actuated surface 186 on the intermediate bar 174 comprises bow-shaped section 238, and it has with axis 242 is the constant radius R at center, and its medial axis 242 is substantially parallel with the axis 154 of gate footstep lever 146.In the structure that illustrates, axis 242 is coaxial with the axis 154 of gate footstep lever 146, thereby when intermediate bar 174 counterclockwise was pivoted to position shown in Figure 19 and 20, servo-actuated surface 186 was at the axis 154 that all passes or intersect at gate footstep lever 146 along the vector that is applied to the reaction force on the cam face 230 on bow-shaped section 238 any points.This vector also is orthogonal to the straight line that is tangential to cam face 230 and servo-actuated surface 186 at bow-shaped section 238 those places.
Referring to Figure 19, first end 246 of bow-shaped section 238 overlaps substantially with the throttler valve angle A11 of decentre axis 138 about 58 degree.In other words, be about 58 when spending when throttler valve 142 moves to the throttler valve angle from the fully open position of as shown in figure 18 throttler valve 142, cam face 230 is engaging servo-actuated surface 186 with first terminal 246 position that overlaps of bow-shaped section 238.Referring to Figure 20, second end 250 of bow-shaped section 238 overlaps substantially with the throttler valve angle A12 of decentre axis 138 about 75 degree.In other words, be about 75 when spending when throttler valve 142 moves to the throttler valve angle from the fully open position of as shown in figure 18 throttler valve 142, cam face 230 is engaging servo-actuated surface 186 with second terminal 250 position that overlaps of bow-shaped section 238.Like this, cam face 230 and bow-shaped section 238 engage in the scope of about 17 degree of throttler valve opening, from the position of the throttler valve shown in Figure 19 142 to the position of the throttler valve shown in Figure 20 142.Alternatively, the bow-shaped section 238 on servo-actuated surface 186 can comprise that than the shorter length shown in Figure 19 and 20 cam face 230 engages about 17 degree that can be less than the throttler valve opening with bow-shaped section 238 like this.In addition, the bow-shaped section 238 on servo-actuated surface 186 can comprise that than the longer length shown in Figure 19 and 20 cam face 230 engages with bow-shaped section 238 and can spend greater than about 17 of throttler valve opening like this.
In the optional structure of vaporizer 126, when intermediate bar 174 pivoted between the position shown in Figure 19 and 20 along clockwise direction, the axis 242 with bow-shaped section 238 of constant radius R can slightly depart from the axis 154 of throttler valve 142.The result is that servo-actuated surface 186 is not all intersecting at the axis 154 of gate footstep lever 146 along the vector that is applied to the reaction force on the cam face 230 on bow-shaped section 238 any points, but is positioned near the axis 154 of gate footstep lever 146.Such structure can cause reaction torque less but that can tolerate to be applied on the gate footstep lever 146 (for example, being no more than about 10 inches grams), its can substantial interference to the operation of regulator.
In the motor of the vaporizer 126 that combines Figure 16-20, gate footstep lever 146 is conditioned device bar or push element (as return spring) thereby towards the pushing of the position as shown in Figure 18 throttler valve 142 is directed to the position of fully opening or opening fully with the preparation as engine cold starting.In addition, thus choke bar 162 is directed to closed position with preparation as engine cold starting towards the position shown in Figure 18 pushing with choke valve 158 by spring 224.After the engine start, regulator activates governor lever at once moves gate footstep lever 30 in the counterclockwise direction, as shown in Figure 19 and 20, thereby throttler valve 142 is moved to certain location or throttler valve angle to realize the expectation no-load running speed of motor.In the structure of vaporizer 126 shown in Figure 20,, reached the selected no-load running speed of motor by throttler valve 142 being moved to the position of decentre axis 138 about 75 degree.Alternatively, vaporizer 126 can be configured in the selected no-load running speed that reaches motor corresponding to cam face 230 and servo-actuated surface 186 on any position of bow-shaped section 238 at the place, throttler valve angle that engages.
Referring to Figure 18-20, along with gate footstep lever 146 is pivoted to position shown in its Figure 20 from position shown in its Figure 18, gate footstep lever 146 applies active force on the first arm 182 of intermediate bar 174, it applies the active force of opening choke valve 158 via second arm 190 again to choke bar 162.As previously mentioned, return spring 224 is pressed to choke bar 162 on the position that makes choke valve 158 closures (seeing Figure 18).The result is, choke bar 162 applies reaction force along the normal vector that is tangential to both straight lines of cam face 230 and servo-actuated surface 186 via intermediate bar 174 on gate footstep lever 146.Can not be when the axis 154 of reaction force and gate footstep lever 146 on time, reaction force produces reaction torque on gate footstep lever 146.Figure 19 shows the scope at the joining portion 258 on cam face 230 and servo-actuated surface 186, and along this joining portion 258, reaction force can not be aimed at the axis 154 of gate footstep lever 146.The amount of reaction torque depends on gate footstep lever 146, the geometrical shape of intermediate bar 174 and choke bar 162, and the spring rate of return spring 224.
But referring to Figure 19 and 20, the constant radius R of bow-shaped section 238 has guaranteed can be aimed at or intersect at by the vector that servo-actuated surface 186 is applied to the reaction force on the cam face 230 axis 154 of gate footstep lever 146.The result is, be applied on the gate footstep lever 146 reaction force not can produce on the gate footstep lever 146 reaction torque hinder or influence gate footstep lever 146 on cam face 230 and servo-actuated surface 186 moving in the joining portion scope of bow-shaped section 238.By basic elimination on cam face 230 and servo-actuated surface 186 in the joining portion scope of bow-shaped section 238 reaction torque on the gate footstep lever 146, vaporizer 126 can be constructed to be permeable to provide the large-scale selected no-load running speed of motor, therein regulator can be not disturbed to the control of gate footstep lever 146 or make disturb drop to minimum.In addition, but gate footstep lever 146 responding engines load on cam face 230 and move in the joining portion scope of bow-shaped section 238 in servo-actuated surface 186, and can not interfered with the control of regulator to gate footstep lever 146 via the reaction force that intermediate bar 174 imposes on gate footstep lever 146 by choke bar 162.
After the engine start, heat-conductive assembly is actuatable with further pivot intermediate bar 174, and and then pivot choke bar 162 intermediate bar 174 is broken away from from gate footstep lever 146, and choke bar 162 is maintained the position that choke valve 158 is opened fully.In the process of engine thermal starting, heat-conductive assembly can keep activating choke valve 158 is maintained on its position of opening fully.
Figure 21-25 shows the 5th kind of structure of the vaporizer 262 that is configured for mini engine.Same element adds letter " a ", and introduces no longer in detail with same reference numbers sign.The operation of vaporizer 262 is similar substantially to the vaporizer 126 shown in Figure 16-20.But, the length of bow-shaped section 238a makes cam face 230a can engage in the about 30 degree scopes of throttler valve opening with bow-shaped section 238a, and (wherein about 45 degree of the throttler valve angle A13 between throttler valve 142a and central axis 138a) are to the position (wherein the throttler valve angle A14 throttler valve 142a and central axis 138a about 75 spends) of the throttler valve 142a shown in Figure 25 from the position of the throttler valve 142a shown in Figure 24.
Although content disclosed by the invention is introduced with reference to embodiment, persons skilled in the art will recognize that the theme tone and the scope that do not break away from claim can make many changes in form and details.For example, claim to comprise one or more features that one or more benefits are provided although different embodiments has introduced, what can reckon with is that the feature of introducing can exchange or combination with one another each other alternatively in described embodiment or other optional embodiments.Because technology relative complex of the present disclosure, unpredictable institute to technology changes.The disclosure is introduced with reference to embodiment and proposes in ensuing claims, and very clear is for wide as far as possible.For example, except as otherwise noted, the single particular element of claims statements a plurality of such particular element groups of also including.
Claims (20)
1. vaporizer that is used for internal-combustion engine, vaporizer comprises:
Main body wherein defines passage;
The gate footstep lever that comprises cam face;
Be arranged in described passage and respond the throttler valve of the motion of gate footstep lever, throttler valve is configured to rotate to apart from the second place of primary importance at least 50 degree around first axle from the primary importance of fully opening;
The choke bar, it comprises the servo-actuated surface that is used for cam;
Choke valve, the motion that it is arranged in described passage and responds the choke bar;
Wherein, one of them of cam face and servo-actuated surface comprises bow-shaped section, it has with second axis is the constant radius at center, and the bow-shaped section long enough makes and to spend when another throttler valve when engaging bow-shaped section in cam face and the servo-actuated surface moves at least 15.
2. the vaporizer of claim 1, wherein, second axis and first axle axially align.
3. the vaporizer of claim 1, the cam face that wherein engages and servo-actuated surface limit many along bow-shaped section and radially contact straight line with first axle intersects.
4. the vaporizer of claim 1, wherein, bow-shaped section comprises first terminal and second end, and rotates at least 40 when spending from the primary importance of fully opening when throttler valve, described cam face and servo-actuated surface described one of them engage with first end of bow-shaped section.
5. the vaporizer of claim 4, wherein, when throttler valve rotates to the second place, described cam face and servo-actuated surface described one of them with second terminal joint of bow-shaped section.
6. the vaporizer of claim 1, wherein, cam follower surface is pressed to not and the cam face position contacting by elasticity.
7. the vaporizer of claim 1, wherein, cam face is pressed to the primary importance of fully opening by elasticity.
8. the vaporizer of claim 1, wherein, cam face comprises bow-shaped section.
9. the vaporizer of claim 1, wherein, the servo-actuated surface comprises bow-shaped section.
10. method comprises:
Mobile gate footstep lever makes that the throttler valve in the vaporizer passage rotates to the second place of spending from primary importance at least 50 around first axle from the primary importance of fully opening;
Make the servo-actuated surface of choke bar and the cam of gate footstep lever, thereby the choke valve that is arranged in passage is moved, wherein, throttler valve moves in the process of 15 degree at least when cam face and servo-actuated surface engagement, and reaction force between servo-actuated surface and the cam face and first axle intersect.
11. the method for claim 10, wherein, it is the constant radius at center that one of them of cam face and servo-actuated surface has with second axis, and it is around second axis at least 15 degree.
12. the method for claim 11, wherein, second axis and first axle axially align.
13. the method for claim 11, wherein, cam face and servo-actuated surface when bow-shaped section engages, limit many with first axle crossing radially contact straight line.
14. the method for claim 11, wherein, bow-shaped section comprises first terminal and second end, and, when throttler valve when the primary importance fully opened rotation at least 40 is spent, described cam face and servo-actuated surface described one of them engage with first end of bow-shaped section.
15. the method for claim 11, wherein, cam face comprises bow-shaped section.
16. the method for claim 11, wherein, the servo-actuated surface comprises bow-shaped section.
17. the method for claim 1 further comprises the servo-actuated surface elasticity is pressed to not and the cam face position contacting.
18. the method for claim 1 further comprises cam face elasticity is pressed to the primary importance of fully opening.
19. a vaporizer that is used for internal-combustion engine, vaporizer comprises:
Main body wherein defines passage;
The gate footstep lever that comprises cam face;
Be arranged in described passage and respond the throttler valve of the motion of gate footstep lever, throttler valve is configured to rotate to apart from the second place of primary importance at least 50 degree around first axle from the primary importance of fully opening;
The choke bar, it comprises the servo-actuated surface that is configured to cam;
Choke valve, the motion that it is arranged in described passage and responds the choke bar;
Wherein cam face and servo-actuated surface are configured to when cam face and servo-actuated surface engagement throttler valve and move in the processes of at least 15 degree, and the reaction force between servo-actuated surface and the cam face and first axle are crossing.
20. the vaporizer of claim 19, wherein, it is the constant radius at center that one of them of cam face and servo-actuated surface has with second axis, and it is around second axis at least 15 degree.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/242,853 US8240639B2 (en) | 2007-12-06 | 2008-09-30 | Carburetor and automatic choke assembly for an engine |
| US12/242,853 | 2008-09-30 |
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| Publication Number | Publication Date |
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| CN101713352A true CN101713352A (en) | 2010-05-26 |
| CN101713352B CN101713352B (en) | 2016-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810178887.8A Active CN101713352B (en) | 2008-09-30 | 2008-12-04 | Engine vaporizer and automatic choke assembly |
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| CN (1) | CN101713352B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493880A (en) * | 2011-12-14 | 2012-06-13 | 淄博柴油机总公司 | Internal combustion engine |
| CN103016163A (en) * | 2011-09-20 | 2013-04-03 | 富士重工业株式会社 | Operation device for engine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1014165B (en) * | 1987-08-17 | 1991-10-02 | 纪培新 | Linkage system between throttle valve and choke flap of carburetor |
| US5069180A (en) * | 1990-10-19 | 1991-12-03 | Onan Corporation | Automatic choke apparatus and method |
| US5611312A (en) * | 1995-02-07 | 1997-03-18 | Walbro Corporation | Carburetor and method and apparatus for controlling air/fuel ratio of same |
| DE10145293B4 (en) * | 2001-09-14 | 2012-04-05 | Andreas Stihl Ag & Co. | carburetor arrangement |
| TWI268309B (en) * | 2004-03-03 | 2006-12-11 | Honda Motor Co Ltd | Device for controlling choke valve of carburetor |
-
2008
- 2008-12-04 CN CN200810178887.8A patent/CN101713352B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103016163A (en) * | 2011-09-20 | 2013-04-03 | 富士重工业株式会社 | Operation device for engine |
| CN102493880A (en) * | 2011-12-14 | 2012-06-13 | 淄博柴油机总公司 | Internal combustion engine |
| CN102493880B (en) * | 2011-12-14 | 2015-05-13 | 淄博柴油机总公司 | Internal combustion engine |
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| Publication number | Publication date |
|---|---|
| CN101713352B (en) | 2016-02-17 |
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