CN101713352B - Engine vaporizer and automatic choke assembly - Google Patents
Engine vaporizer and automatic choke assembly Download PDFInfo
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- CN101713352B CN101713352B CN200810178887.8A CN200810178887A CN101713352B CN 101713352 B CN101713352 B CN 101713352B CN 200810178887 A CN200810178887 A CN 200810178887A CN 101713352 B CN101713352 B CN 101713352B
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Abstract
Be configured for a vaporizer for internal-combustion engine, comprise main body, therein defining passage, gate footstep lever, comprising cam face, and throttler valve, it is arranged in passage and responds the motion of gate footstep lever.Throttler valve is configured to rotate to from the primary importance fully opened the second place spent apart from primary importance at least 50 around first axle.Vaporizer also comprises choke bar, comprising being configured to the follower surface with cam, and choke valve, it is arranged in passage and responds the motion of choke bar.One of cam face and follower surface comprise bow-shaped section, and it has the constant radius centered by the second axis.Bow-shaped section is sufficiently long to throttle valve valve constitution one-tenth can move at least 15 degree when other cam faces and follower surface engage bow-shaped section.
Description
The reference of patent application associated cross
The name that the application's request DavidRoth applied on December 6th, 2007 is called " CARBURETORANDAUTOMATICCHOKEASSEMBLYFORANENGINE " the U.S. Patent Application Serial Number No.60/992 of (" engine vaporizer and automatic choke assembly ") CO-PENDING, the preference of 866, its whole disclosure is by reference to being incorporated into this.
Background of invention
In the compact internal combustion engine using vaporizer, such as those are used in outdoor power equipment (such as lawnmower, snowblower, etc.) in motor, the cold-starting of motor typically needs the mixture of the air-fuel of fuel-abundance to maintain combustion reaction.In some motors, this completes by closing choke valve, thus partly blocks cylinder or cylinder block that air is fed to motor.Along with the intensification of motor, because the temperature that raises in motor helps to maintain combustion reaction, no longer need choker, and therefore choker is opened and allows more air enter combustion cylinders or cylinder block.
Some vaporizers for compact internal combustion engine comprise gate footstep lever, or directly or via connecting rod be attached to choke bar choke valve activating choke valve and engage.Regulator is used for activating gate footstep lever with the throttler valve be attached on gate footstep lever to control the speed of motor typically.
Summary of the invention
One aspect of the present invention provides a kind of vaporizer for internal-combustion engine, comprises the main body that therein defining passage, the gate footstep lever comprising cam face and is arranged in passage and responds the throttler valve of the motion of gate footstep lever.Throttler valve is configured to rotate to from the primary importance fully opened the second place spent apart from primary importance at least 50 around first axle.Vaporizer also comprises: choke bar, comprising being configured to the follower surface with cam; And choke valve, it is arranged in passage and responds the motion of choke bar.One of them of cam face and follower surface comprises bow-shaped section, and it has the constant radius centered by the second axis.Bow-shaped section long enough makes move at least 15 degree when another in cam face and follower surface engages bow-shaped section subject throttle valve.
One aspect of the present invention provides a kind of vaporizer for internal-combustion engine.Vaporizer comprises the main body defining passage, the gate footstep lever comprising cam face, and is arranged in passage and responds the throttler valve of the motion of gate footstep lever.Throttler valve is configured to rotate to from the primary importance fully opened the second place spent apart from primary importance at least 50 around first axle.Vaporizer also comprises: choke bar, comprising being configured to the follower surface with 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 has the bow-shaped section of the constant radius centered by the second axis.Bow-shaped section long enough makes the bow-shaped section subject throttle valve when follower surface engagement cam surfaces can move at least 15 degree.
Vaporizer of the present invention is in order to for outdoor power equipment, and it is designed to run under variable velocity and variable load.By the cam face for vaporizer of the present invention provides bow-shaped section, the reaction torque that choke bar produces on gate footstep lever can be reduced substantially, or substantially eliminated under large-scale throttle valve position and engine speed, thus it is excessive to the control of gate footstep lever under large-scale throttle valve position and engine speed to substantially prevent regulator.But vaporizer of the present invention also can be used for the equipment that other take motor as power, it is designed to run under basicly stable speed and load (as generator).
Other characteristic sum aspects of the present invention can by becoming clear in conjunction with ensuing introduction and accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the top perspective of the first 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 primary importance with the fully open position of corresponding throttler valve.
Fig. 3 is the plan view of the vaporizer of Fig. 1, shows gate footstep lever and is positioned at the second place with first portion's closed position of corresponding throttler valve.
Fig. 4 is the plan view of the vaporizer of Fig. 1, shows gate footstep lever and is positioned at the 3rd position with the second portion closed position of corresponding throttler valve.
Fig. 5 is the plan view of the carburetor throttle bar of Fig. 1.
Fig. 6 is the top perspective of vaporizer the second structure of the present invention.
Fig. 7 is the plan view of the vaporizer of Fig. 6, shows gate footstep lever and is positioned at primary importance with the fully open position of corresponding throttler valve.
Fig. 8 is the plan view of the vaporizer of Fig. 6, shows gate footstep lever and is positioned at the second place with first portion's closed position of corresponding throttler valve.
Fig. 9 is the plan view of the vaporizer of Fig. 6, shows gate footstep lever and is positioned at the 3rd position with the second portion closed position of 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 primary importance with the fully open position of corresponding throttler valve.
Figure 13 is the plan view of the vaporizer of Figure 11, shows gate footstep lever and is positioned at the second place with first portion's closed position of corresponding throttler valve.
Figure 14 is the plan view of the vaporizer of Figure 11, shows gate footstep lever and is positioned at the 3rd position with the second portion closed position of corresponding throttler valve.
Figure 15 is the plan view of the carburetor throttle bar of Figure 11.
Figure 16 is the top perspective of vaporizer of the present invention 4th kind of structure.
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 primary importance with the fully open position of corresponding throttler valve.
Figure 19 is the plan view of the vaporizer of Figure 16, shows gate footstep lever and is positioned at the second place with first portion's closed position of corresponding throttler valve.
Figure 20 is the plan view of the vaporizer of Figure 16, shows gate footstep lever and is positioned at the 3rd position with the second portion closed position of corresponding throttler valve.
Figure 21 is the top perspective of vaporizer of the present invention 5th kind of structure.
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 primary importance with the fully open position of 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 with first portion's closed position of corresponding throttler valve.
Figure 25 be Figure 21 the plan view of vaporizer, show gate footstep lever and be positioned at the 3rd position with the second portion closed position of corresponding throttler valve.
Figure 26 is the top perspective of vaporizer of the present invention 6th kind of structure.
Figure 27 is the plan view of the vaporizer of Figure 26, shows gate footstep lever and is positioned at primary importance with the fully open position of corresponding throttler valve.
Figure 28 is the plan view of the vaporizer of Figure 26, shows gate footstep lever and is positioned at the second place with first portion's closed position of corresponding throttler valve.
Figure 29 is the plan view of the vaporizer of Figure 26, shows gate footstep lever and is positioned at the 3rd position with the second portion closed position of corresponding throttler valve.
Figure 30 is the plan view of the carburetor throttle bar of Figure 26.
Embodiment
Before any embodiments of the invention are explained in detail, be to be understood that and the invention is not restricted to its detailed configuration in the application of ensuing specification or proposition drawn in the following figures and element is arranged.The present invention can have other embodiments and can be put into practice by various different modes or be completed.It is also to be understood that the object of phraseology and terminology used in this should not be understood to limited tailor-made use to introduce." comprising " is used " to comprise " or the meaning of " having " and modification thereof the article listed thereafter and its equivalent transformation and extra article will be included at this.Unless otherwise mentioned or limit, term " installations " " connections " " supports " and " connection " and modification thereof are all broadly use and include directly and indirectly to install, connection, support and connect.In addition, " connection " and " connection " be not limited to physics or the connection of machinery or connection.
Fig. 1-4 shows the first structure of the vaporizer 10 for mini engine.Such motor can be used in outdoor power equipment (as lawnmower, snowblower, etc.) or other types are in the equipment of power (as generator) with motor.Vaporizer 10 comprises main body 14, its centrally axis 22 define air/fuel passage 18.Vaporizer 10 also comprises the throttler valve 26 being arranged in passage 18, and is attached to the gate footstep lever 30 on throttler valve 26 via solar term door handle 34.Throttler valve 26, solar term door handle 34 and gate footstep lever 30 can be roughly orthogonal around the central axis 22 with passage 18 axis 38 pivotable.Continue see Fig. 1-4, vaporizer 10 also comprises the choke valve 42 being arranged in passage 18, and is attached to the choke bar 46 on choke valve 42 via choke handle 50.Choke valve 42, choke handle 50 and choke bar 46 also can be roughly orthogonal around the central axis 22 with passage 18 axis 54 pivotable.
See Fig. 2-4, gate footstep lever 30 comprises the arm 58 being attached to engine controller bar (not shown), and it is optionally activated by another element of regulator in motor again and opens and closes throttler valve 26.In the structure of the gate footstep lever 30 illustrated, arm 58 comprises the connection (as passed through fastening piece) that auxiliary governor bar and gate footstep lever 30 are come in hole 62.Alternatively, arm 58 can be attached on governor lever by any one in a large amount of different modes.
See Fig. 1, gate footstep lever 30 also comprises block 66, and it is configured to the degree engaging the opening and closing to limit throttler valve 26 with the different piece of main body 14.In a kind of structure of vaporizer 10, block 66 can engage the unlatching limiting throttler valve 26 with the jut 70 on vaporizer 10.Block 66 also can with the screw fit shooting main body 10 part to limit the closed of throttler valve 26.The size of jut 70 and position can be set as the opening of throttler valve 26 can be restricted to and measure from the plane 74 that the central axis 22 with passage 18 is orthogonal closure angle A1 (seeing Fig. 2) being 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 throttler valve 26 direction substantially parallel with central axis 22.On this position, throttler valve 26 " fully opening " or open completely, allows the air-flow of maximum flow by passage 18.Screw can adjust relative to main body 14, such as, closed being restricted to of throttler valve 26 is measured from plane 74 the closure angle A2 (namely count from the fully open position of the throttler valve 26 shown in Fig. 2 about 75 degree " closing ", see Fig. 4) being about 15 degree.The alternate configurations of vaporizer 10 can to utilize in structures different in a large number and element any one to limit the opening and closing of throttler valve 26.
See Fig. 1-4, choke bar 46 comprises the arm 78 be attached in push element (as spring 82).Arm 78 comprises hole 86, and a part for spring 82 is inserted through and wherein spring 82 and arm 78 is tied.Arm 78 is positioned on choke bar 46 and makes spring 82 on choke bar 46, apply moment of torsion in the counterclockwise direction around axis 54, as illustrated in figs. 2-4, is pushed by choke valve 42 to operating position.Choke bar 46 can comprise another arm (not shown), and it is attached to the position that heat-conductive assembly optionally can operate and keep or maintain choke valve 42 to open completely on choke bar 46.Such heat-conductive assembly in U.S. Patent No. 6,990, open in 969, its whole disclosure is by reference to being incorporated into this.
See Fig. 2-4, gate footstep lever 30 comprises cam face 90, and it engages with the follower surface 94 of choke bar 46.As best shown in FIG. 5, cam face 90 comprises bow-shaped section 98, and it has the constant radius R centered by axis 102, and its medial axis 102 is substantially parallel with the axis 38 of gate footstep lever 30.In the structure illustrated, axis 102 is coaxial with the axis 38 of gate footstep lever 30, makes pass at the reaction force vector be applied on cam face 90 by follower surface 94 along bow-shaped section 98 any some place or intersect at the axis 38 of gate footstep lever 30.This vector is also orthogonal to the straight line being tangential to cam face 90 and follower surface 94 at this place of bow-shaped section 98.
See Fig. 3, bow-shaped section first end 106 overlaps substantially with throttler valve angle (throttlevalveangle) A3 of about 47 degree, decentre axis 22.In other words, when throttler valve 26 to move to from the position that throttler valve 26 is as shown in Figure 2 opened completely throttler valve angle be about 47 degree time, follower surface 94 is in the position engagement cam surfaces 90 overlapped with the first end 106 of bow-shaped section 98.See Fig. 4, bow-shaped section 98 second end 110 overlaps substantially with the throttler valve angle A4 of about 75 degree, decentre axis 22.In other words, when throttler valve 26 to move to from the position that throttler valve 26 is as shown in Figure 2 opened completely throttler valve angle be about 75 degree time, follower surface 94 is in the position engagement cam surfaces 90 overlapped with the second end 110 of bow-shaped section 98.Like this, follower surface 94 engages within the scope of throttler valve opening about 28 degree with bow-shaped section 98, the position from the position of the throttler valve 26 shown in Fig. 3 to the throttler valve 26 shown in Fig. 4.Alternatively, the bow-shaped section 98 of cam face 90 can comprise than the shorter length shown in Fig. 5, and such follower surface 94 and bow-shaped section 98 joint can be less than about 28 degree of throttler valve opening, but are at least 15 degree.In addition, the bow-shaped section 98 of cam face 90 can comprise than the longer length shown in Fig. 5, and such follower surface 94 and bow-shaped section 98 joint can be greater than about 28 degree of throttler valve opening.
In the alternate configurations of vaporizer 10, the axis 102 of constant radius R can slightly offset from the axis 38 of gate footstep lever 30.As a result, follower surface 94 is at the axis 38 all not intersecting at gate footstep lever 30 along the vector any point of bow-shaped section 98 being applied to the reaction force on cam face 90, but near the axis 38 being positioned at gate footstep lever 30.Such structure can cause reaction torque that is less but that can tolerate to be applied on gate footstep lever 30 (such as, being no more than about 10 inches grams), its can not substantial interference to the operation of regulator.
In the motor of vaporizer combining Fig. 1-4, gate footstep lever 30 is conditioned device bar or push element (as return spring) towards the position pushing as shown in Fig. 2 and throttler valve 26 is directed to the position of fully opening or open completely using the preparation as engine cold starting.In addition, choke bar 46 by spring 82 towards shown in Fig. 2 position pushing thus choke valve 42 is directed to closed position using the preparation as engine cold starting.After motor one starts, regulator just activates governor lever throttle valve bar 30 at once and moves in the counterclockwise direction, as shown in Figures 3 and 4, thus by gate footstep lever 30 specific position or throttler valve angle is moved to realize the expectation no-load running speed of motor.In the structure of vaporizer 10 shown in figure 2, move to by the position of being opened completely from the throttler valve 26 shown in Fig. 2 by throttler valve 26 position being about 75 degree, reach the expectation no-load running speed of motor.Alternatively, vaporizer 10 can be configured so that reaching the expectation no-load running speed of motor corresponding to cam face 90 and follower surface 94 at the throttler valve angle place of any engagement position along bow-shaped section 98.
See Fig. 2-4, when gate footstep lever 30 is pivoted to position shown in its Fig. 4 from position shown in its Fig. 2, gate footstep lever 30 applies the active force opening choke valve 42 on choke bar 46.As previously mentioned, choke bar 46 is pressed to and choke valve 42 is closed on the position of (seeing Fig. 2) by spring 82.As a result, choke bar 46 applies reaction force along the normal vector of the straight line being tangential to both cam face 90 and follower 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 of cam face 90 and follower 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 see Fig. 3 and 4, the constant radius R of bow-shaped section 98 ensure that the axis 38 of gate footstep lever 30 can be aimed at or intersect to the vector being applied to the reaction force on cam face 90 by follower surface 94.Hinder as a result, the reaction force be applied on cam face 90 can not produce corresponding reaction torque on gate footstep lever 30 or affect gate footstep lever 30 at cam face 90 and follower surface 94 along move (the seeing Fig. 5) within the scope of the joining portion of bow-shaped section 98.By substantially eliminating the reaction torque within the scope of the joining portion of bow-shaped section 98 on gate footstep lever 30 at cam face 90 and follower surface 94, vaporizer 10 can be constructed to be permeable to provide the selected on a large scale of motor to expect no-load running speed, within the scope of this, the interference that the regulator of gate footstep lever 30 controls is minimized or is avoided.In addition, gate footstep lever 30 can responding engine load at cam face 90 and the follower surface 94 joining portion range of motion along bow-shaped section 98, and the control of regulator to gate footstep lever 30 can not be interfered with by the reaction force being applied to gate footstep lever 30 by choke bar 46.
After engine start, heat-conductive assembly is actuatable makes choke bar 46 and gate footstep lever 30 depart from further pivotable choke bar 46, and choke bar 46 is maintained the position that choke valve 42 opens completely.Restart in (hot-restart) process in engine thermal, heat-conductive assembly can keep activating and maintained on its position of opening completely by choke valve 42.
Figure 26-29 shows the vaporizer 10 ' similar to the vaporizer 10 shown in Fig. 1-4.Same element same reference numbers mark, adds main symbol, and introduces no longer in detail.But, when gate footstep lever 30 ' throttler valve 26 ' rotating closed around its axis 38 ' clockwise direction, just engage choke bar 46 ' and make choke bar 46 ' rotate in the counterclockwise direction to open choke valve 42 ' (seeing Figure 27-29) around its axis 54 '.Like this, gate footstep lever 30 ' rotates with closed throttler valve 26 ' with the direction contrary with gate footstep lever 30 with regard to being configured to, and choke bar 46 ' is configured to rotate to open choke valve 42 ' with the direction contrary with choke bar 46.As shown in Figure 30, gate footstep lever 30 ' is the mirror image of gate footstep lever 30 drawn in Fig. 5.
Fig. 6-9 shows the second structure of the vaporizer 118 being configured for mini engine.Same element same reference numbers mark, adds letter " a ", and introduces no longer in detail.The operation of vaporizer 118 and the vaporizer shown in Fig. 1-4 10 basic simlarity.But, the shape of the cam face 90a within the scope of the joining portion 114a of cam face 90a with follower surface 94a creates the reaction torque curve different from constructing the curve that obtains from Fig. 1-5 gate footstep lever 30a (such as, reaction torque is to throttler valve angle), along cam face 90a, the axis 38a misalignment of reaction force and gate footstep lever 30a (namely the fully open position of throttler valve 26a and and central axis 22a into about between the throttler valve angle A5 of 40 degree; See Fig. 8).In addition, the length of bow-shaped section 98a makes follower surface 94a and bow-shaped section 98a engage in the throttler valve opening range of about 35 degree, position from the position of the throttler valve 26a shown in Fig. 8 to the throttler valve 26a shown in Fig. 9, throttler valve angle A6 formed by throttler valve 26a and central axis 22a about 75 degree in Fig. 9.
Figure 11-14 shows the third structure of the vaporizer 122 being configured for mini engine.Same element same reference numbers mark, adds letter " b ", and introduces no longer in detail.In the operation of vaporizer 118 and Fig. 1-4 and Fig. 6-9 respectively shown in vaporizer 10,118 basic simlarity.But, the shape of the cam face 90b within the scope of the joining portion 114b of cam face 90b with follower surface 94b creates the reaction torque curve different from constructing the curve that obtains from Fig. 1-5 gate footstep lever 30b (such as, reaction torque is to throttler valve angle), along cam face 90b, the axis 38b misalignment of reaction force and gate footstep lever 30b (namely the fully open position of throttler valve 26b and and central axis 22b into about between the throttler valve angle A7 of 47 degree; See Figure 13).In addition, the length of bow-shaped section 98b makes follower surface 94b and bow-shaped section 98b engage in the throttler valve opening range of about 28 degree, position from the position of the throttler valve 26b shown in Figure 13 to the throttler valve 26b shown in Figure 14, throttler valve angle A8 formed by throttler valve 26b and central axis 22b about 75 degree in Figure 14.
Figure 16-20 shows the 4th kind of structure of the vaporizer 126 being configured for mini engine.Vaporizer 126 comprises main body 130, its centrally axis 138 define air/fuel passage 134.Vaporizer 126 also comprises the throttler valve 142 being arranged in passage 134 and the gate footstep lever 146 be attached to via solar term door handle 150 on throttler valve 142.Throttler valve 142, solar term door handle 150 and gate footstep lever 146 can be roughly orthogonal around the central axis 138 with passage 134 axis 154 pivotable.Vaporizer 126 also comprises the choke valve 158 being arranged in passage 134 and the choke bar 162 be attached to via choke handle 166 on choke valve 158.Choke valve 158, choke handle 166 and choke bar 162 also can be roughly orthogonal around the central axis 138 with passage 134 axis 178 pivotable.
Continue see Figure 16-20, vaporizer 126 also comprises intermediate bar 174, and it is attached to axis 178 pivotable that also can be roughly orthogonal around the central axis 138 with passage 134 in main body 130.Intermediate bar 174 comprises first arm 182 with follower surface 186 and second arm 190 with cam face 194.To describe in detail as follows, intermediate bar 174 by the Movement transmit of gate footstep lever 146 to choke bar 162 with mobile choke valve 158.Intermediate bar 174 also can be attached to heat-conductive assembly optionally can carry out by intermediate bar 174 and and then keep or maintain choke valve 158 to open completely on choke bar 162 position on operation.Such heat-conductive assembly in U.S. Patent No. 6,990, open in 969, its whole disclosure is by reference to being incorporated into this.
See Figure 18-20, gate footstep lever 146 comprises the arm 202 be attached on engine controller bar (not shown), and it is optionally activated by another element of regulator in motor again and opens and closes throttler valve 142.In the structure of the gate footstep lever 146 illustrated, arm 202 comprises the connection (as passed through fastening piece) that auxiliary governor bar and gate footstep lever 146 are come in hole 206.Alternatively, arm 202 can be attached on governor lever by other different modes.
See Figure 16 and 17, gate footstep lever 146 also comprises block 210, and it is configured to the degree engaging the opening and closing to limit throttler valve 142 with the different piece of main body 130.In a kind of structure of vaporizer 126, block 210 can engage the opening limiting throttler valve 142 with the jut 214 on vaporizer 126.Block 210 also can by with the screw fit shooting main body 130 part to limit the closed of throttler valve 142.Size and position can be set as the opening of throttler valve 142 can be restricted to and measure from the plane 218 orthogonal with passage 134 central axis 138 closure angle A9 (seeing Figure 18) being about 90 degree by jut 214.In other words, size and position can be set as and the opening of throttler valve 142 can be restricted on throttler valve 142 direction substantially parallel with central axis 138 by jut 214.On this position, throttler valve 142 " fully opening " or open completely, allows the air-flow of maximum flow by passage 134.Screw can carry out adjusting relative to main body 130 in case such as throttler valve 142 closed is restricted to from plane 218 measure be about 15 degree closure angle A10 (that is, with central axis 138 into about 75 degree; See Figure 20).The alternate configurations of vaporizer 126 can to utilize in structures different in a large number and element any one to limit the opening and closing of throttler valve 142.
See Figure 17-20, choke bar 162 comprises the arm 222 be attached in push element (as spring 224).Arm 222 comprises hole 226, and a part for spring 224 is inserted through and wherein spring 224 and arm 222 is tied.Arm 222 is positioned on choke bar 162 thus the axis 170 of spring 224 winding gas bar 162 applies moment of torsion in the counterclockwise direction on choke bar 162, as shown in Figure 18-20, is pushed by choke valve 158 to operating position.
See Figure 19 and 20, gate footstep lever 146 also comprises cam face 230, and it engages with the follower surface 186 on intermediate bar 174 first arm 182.In the structure of the vaporizer 126 illustrated, 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 is directly positioned on gate footstep lever 146 by the mode that the cam face 90,90a, 90b separately of the gate footstep lever 30,30a, 30b with Fig. 1-15 is similar.As shown in Figures 19 and 20, choke bar 162 comprises follower surface 236, and it engages with the cam face 194 on intermediate bar 174 second arm 190.
Continue see Figure 19 and 20, the follower surface 186 on intermediate bar 174 comprises bow-shaped section 238, and it has the constant radius R centered by axis 242, and its medial axis 242 is substantially parallel with the axis 154 of gate footstep lever 146.In the structure illustrated, axis 242 is coaxial with the axis 154 of gate footstep lever 146, thus, when intermediate bar 174 is counterclockwise pivoted to position shown in Figure 19 and 20, follower surface 186 is all passing along the vector any point of bow-shaped section 238 being applied to the reaction force on cam face 230 or is intersecting at the axis 154 of gate footstep lever 146.This vector is also orthogonal to the straight line being tangential to cam face 230 and follower surface 186 at that place of bow-shaped section 238.
See Figure 19, the throttler valve angle A11 of about 58 degree, the first end 246 and the decentre axis 138 of bow-shaped section 238 overlaps substantially.In other words, when throttler valve 142 to move to from the fully open position of throttler valve 142 as shown in figure 18 throttler valve angle be about 58 degree time, cam face 230 is engaging follower surface 186 with the position that the first end 246 of bow-shaped section 238 overlaps.See Figure 20, the throttler valve angle A12 of about 75 degree, the second end 250 and the decentre axis 138 of bow-shaped section 238 overlaps substantially.In other words, when throttler valve 142 to move to from the fully open position of throttler valve 142 as shown in figure 18 throttler valve angle be about 75 degree time, cam face 230 is engaging follower surface 186 with the position that the second end 250 of bow-shaped section 238 overlaps.Like this, cam face 230 engages in the scope of throttler valve opening about 17 degree with bow-shaped section 238, the position from the position of the throttler valve 142 shown in Figure 19 to the throttler valve 142 shown in Figure 20.Alternatively, the bow-shaped section 238 of follower surface 186 can comprise than the shorter length shown in Figure 19 and 20, and such cam face 230 and bow-shaped section 238 joint can be less than about 17 degree of throttler valve opening.In addition, the bow-shaped section 238 of follower surface 186 can comprise than the longer length shown in Figure 19 and 20, and such cam face 230 and bow-shaped section 238 joint can be greater than about 17 degree of throttler valve opening.
In the alternate configurations of vaporizer 126, when intermediate bar 174 is along clockwise direction between the position shown in Figure 19 and 20 during pivotable, the axis 242 with the bow-shaped section 238 of constant radius R can slightly offset from the axis 154 of throttler valve 142.As a result, follower surface 186 is at the axis 154 all not intersecting at gate footstep lever 146 along the vector any point of bow-shaped section 238 being applied to the reaction force on cam face 230, but near the axis 154 being positioned at gate footstep lever 146.Such structure can cause reaction torque that is less but that can tolerate to be applied on gate footstep lever 146 (such as, being no more than about 10 inches grams), its can not substantial interference to the operation of regulator.
In the motor of vaporizer 126 combining Figure 16-20, gate footstep lever 146 is conditioned device bar or push element (as return spring) towards the position pushing as shown in Figure 18 and throttler valve 142 is directed to the position of fully opening or open completely using the preparation as engine cold starting.In addition, choke bar 162 by spring 224 towards shown in Figure 18 position pushing thus choke valve 158 is directed to closed position using the preparation as engine cold starting.After engine start, regulator activates governor lever throttle valve bar 30 at once and moves in the counterclockwise direction, as as shown in Figure 19 and 20, thus throttler valve 142 is moved to specific position or throttler valve angle to realize the expectation no-load running speed of motor.In the structure of vaporizer 126 shown in Figure 20, by throttler valve 142 being moved to the position of about 75 degree, decentre axis 138, reach the selected no-load running speed of motor.Alternatively, vaporizer 126 can be configured to corresponding to cam face 230 and throttler valve angle place that follower surface 186 is engaging on any position of bow-shaped section 238 reaches no-load running speed selected by motor.
See 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, and it applies to choke bar 162 active force opening choke valve 158 via the second arm 190 again.As previously mentioned, choke bar 162 is pressed to and choke valve 158 is closed on the position of (seeing Figure 18) by return spring 224.As a result, choke bar 162 applies reaction force along the normal vector of the straight line being tangential to both cam face 230 and follower surface 186 via intermediate bar 174 on gate footstep lever 146.When the axis 154 of reaction force and gate footstep lever 146 can not on time, reaction force produces reaction torque on gate footstep lever 146.Figure 19 shows the scope at the joining portion 258 of cam face 230 and follower 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, intermediate bar 174, and the geometrical shape of choke bar 162, and the spring rate of return spring 224.
But see Figure 19 and 20, the constant radius R of bow-shaped section 238 ensure that the axis 154 of gate footstep lever 146 can be aimed at or intersect to the vector being applied to the reaction force on cam face 230 by follower surface 186.As a result, the reaction force be applied on gate footstep lever 146 can not produce reaction torque to hinder or affect gate footstep lever 146 at cam face 230 and follower surface 186 along moving within the scope of the joining portion of bow-shaped section 238 on gate footstep lever 146.By substantially eliminating at cam face 230 and follower surface 186 along the reaction torque on gate footstep lever 146 within the scope of the joining portion of bow-shaped section 238, vaporizer 126 can be constructed to be permeable to provide the selected on a large scale no-load running speed of motor, and regulator can not be disturbed or that interference is dropped to is minimum to the control of gate footstep lever 146 wherein.In addition, gate footstep lever 146 can responding engine load at cam face 230 and the follower surface 186 joining portion range of motion along bow-shaped section 238, and the control of regulator to gate footstep lever 146 can not be interfered with by the reaction force that choke bar 162 is applied to gate footstep lever 146 via intermediate bar 174.
After engine start, heat-conductive assembly is actuatable with further pivotable intermediate bar 174, and and then pivotable choke bar 162 intermediate bar 174 is departed from from gate footstep lever 146, and choke bar 162 is maintained the position that choke valve 158 opens completely.In the process that engine thermal is started, heat-conductive assembly can keep activating and maintained on its position of opening completely by choke valve 158.
Figure 21-25 shows the 5th kind of structure of the vaporizer 262 being configured for mini engine.Same element same reference numbers mark, adds letter " a ", and introduces no longer in detail.The operation of vaporizer 262 and the vaporizer shown in Figure 16-20 126 basic simlarity.But, the length of bow-shaped section 238a makes cam face 230a can engage within the scope of throttler valve opening about 30 degree with bow-shaped section 238a, the position (the throttler valve angle A14 wherein throttler valve 142a and central axis 138a about 75 degree) from the position (the throttler valve angle A13 wherein between throttler valve 142a and central axis 138a about 45 degree) of the throttler valve 142a shown in Figure 24 to the throttler valve 142a shown in Figure 25.
Although content disclosed by the invention is introduced with reference to embodiment, persons skilled in the art will recognize that the theme tone that do not depart from claim and scope can make many changes in form and details.Such as, claim to comprise one or more feature providing one or more benefit although different embodiments has introduced, it is expected that the feature introduced can in described embodiment or other embodiment interchangeable with one another or combination with one another alternatively.Because technology relative complex of the present disclosure, unpredictable changing to technology.The disclosure is introduced with reference to embodiment and proposes in ensuing claims, and very clear is in order to wide as far as possible.Such as, except as otherwise noted, the single particular element of claims statement is also included multiple such particular element group.
Claims (19)
1., for a vaporizer for internal-combustion engine, vaporizer comprises:
Main body, therein defining passage;
Comprise the gate footstep lever of 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 from the primary importance fully opened the second place spent apart from primary importance at least 50 around first axle;
Choke bar, it comprises for the follower surface with cam;
Choke valve, it is arranged in described passage and responds the motion of choke bar;
Wherein, one of them of cam face and follower surface comprises bow-shaped section, it has the constant radius centered by the second axis, wherein, second axis and first axle axially align, and bow-shaped section long enough makes when another in cam face and follower surface moves at least 15 degree at joint bow-shaped section subject throttle valve.
2. the vaporizer of claim 1, the cam face wherein engaged limits many radial directions intersected with first axle with follower surface along bow-shaped section and contacts straight line.
3. the vaporizer of claim 1, wherein, bow-shaped section comprises the first end and the second end, and when throttler valve from the primary importance fully opened rotate at least 40 spend time, described cam face and follower surface described one of them engage with the first end of bow-shaped section.
4. the vaporizer of claim 3, wherein, when throttler valve rotates to the second place, described cam face and follower surface described one of them engage with the second end of bow-shaped section.
5. the vaporizer of claim 1, wherein, cam follower surface by Elastic pusher to not with the position of cam surface contact.
6. the vaporizer of claim 1, wherein, cam face by Elastic pusher to the primary importance fully opened.
7. the vaporizer of claim 1, wherein, cam face comprises bow-shaped section.
8. the vaporizer of claim 1, wherein, follower surface comprises bow-shaped section.
9., for controlling a method for engine speed, described method comprises:
Movable joint valve stem, makes the throttler valve in vaporizer passage rotate to the second place spent from primary importance at least 50 from the primary importance fully opened around first axle;
Make the follower surface of choke bar and the cam of gate footstep lever, thus the choke valve being arranged in passage is moved, wherein, move in the process of at least 15 degree when cam face and follower surface engage subject throttle valve, the reaction force between follower surface and cam face is crossing with first axle.
10. the method for claim 9, wherein, one of them of cam face and follower surface has the constant radius centered by the second axis, and it is spent around the second axis at least 15.
The method of 11. claims 10, wherein, the second axis and first axle axially align.
The method of 12. claims 10, wherein, cam face and follower surface limit many radial directions intersected with first axle and contact straight line when bow-shaped section engages.
The method of 13. claims 12, wherein, bow-shaped section comprises the first end and the second end, and, when throttler valve from the primary importance fully opened rotate at least 40 spend time, described cam face and follower surface described one of them engage with the first end of bow-shaped section.
The method of 14. claims 12, wherein, cam face comprises bow-shaped section.
The method of 15. claims 12, wherein, follower surface comprises bow-shaped section.
The method of 16. claims 9, comprise further by follower surface Elastic pusher to not with the position of cam surface contact.
The method of 17. claims 9, comprises cam face Elastic pusher further to the primary importance fully opened.
18. 1 kinds of vaporizers for internal-combustion engine, vaporizer comprises:
Main body, therein defining passage;
Comprise the gate footstep lever of 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 from the primary importance fully opened the second place spent apart from primary importance at least 50 around first axle;
Choke bar, it comprises the follower surface be configured to cam;
Choke valve, it is arranged in described passage and responds the motion of choke bar;
Wherein cam face and follower surface are configured to move in the process of at least 15 degree when cam face and follower surface engage subject throttle valve, and the reaction force between follower surface and cam face is crossing with first axle.
The vaporizer of 19. claims 18, wherein, one of them of cam face and follower surface has the constant radius centered by the second axis, and it is spent around the second axis at least 15.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/242,853 | 2008-09-30 | ||
| US12/242,853 US8240639B2 (en) | 2007-12-06 | 2008-09-30 | Carburetor and automatic choke assembly for an engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101713352A CN101713352A (en) | 2010-05-26 |
| CN101713352B true CN101713352B (en) | 2016-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810178887.8A Active CN101713352B (en) | 2008-09-30 | 2008-12-04 | Engine vaporizer and automatic choke assembly |
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| Country | Link |
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| CN (1) | CN101713352B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5204281B2 (en) * | 2011-09-20 | 2013-06-05 | 富士重工業株式会社 | Engine operation control device |
| CN102493880B (en) * | 2011-12-14 | 2015-05-13 | 淄博柴油机总公司 | Internal combustion engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1031408A (en) * | 1987-08-17 | 1989-03-01 | 纪培新 | Carburetor throttle and chock plate linkage |
| 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 |
| US6641118B2 (en) * | 2001-09-14 | 2003-11-04 | Andreas Stihl Ag & Co. | Carburetor arrangement |
| CN1683773A (en) * | 2004-03-03 | 2005-10-19 | 本田技研工业株式会社 | Device for controlling choke valve of carburetor |
-
2008
- 2008-12-04 CN CN200810178887.8A patent/CN101713352B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1031408A (en) * | 1987-08-17 | 1989-03-01 | 纪培新 | Carburetor throttle and chock plate linkage |
| 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 |
| US6641118B2 (en) * | 2001-09-14 | 2003-11-04 | Andreas Stihl Ag & Co. | Carburetor arrangement |
| CN1683773A (en) * | 2004-03-03 | 2005-10-19 | 本田技研工业株式会社 | Device for controlling choke valve of carburetor |
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| Publication number | Publication date |
|---|---|
| CN101713352A (en) | 2010-05-26 |
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Effective date of registration: 20211103 Address after: Wisconsin Patentee after: Briggs Stratton Ltd. Address before: The United States of Wisconsin Patentee before: Briggs & Stratton Corp. |