CN100465424C - Automatic choke system for carburetor - Google Patents
Automatic choke system for carburetor Download PDFInfo
- Publication number
- CN100465424C CN100465424C CNB2005100855585A CN200510085558A CN100465424C CN 100465424 C CN100465424 C CN 100465424C CN B2005100855585 A CNB2005100855585 A CN B2005100855585A CN 200510085558 A CN200510085558 A CN 200510085558A CN 100465424 C CN100465424 C CN 100465424C
- Authority
- CN
- China
- Prior art keywords
- movable cylinder
- chock plate
- carburetor
- temperature detection
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Means For Warming Up And Starting Carburetors (AREA)
Abstract
An automatic choke system includes: a wax-type temperature sensing section; and an output section which opens a choke valve of a carburetor in response to heat receiving operation of the temperature sensing section. Temperature sensing section includes: a bottomed cylindrical housing attached to an engine with its bottom portion directed to a high-temperature portion of the engine; a bottomed movable cylinder; a stationary piston slidably supported by the movable cylinder and having one end protruding out of the movable cylinder; and a wax contained in the movable cylinder in a sealed manner, and causing the movable cylinder and the stationary piston to move relative to each other in an axial direction. The movable cylinder is slidably housed in the housing in a state in which an outer end of the stationary piston abuts against an inner surface of the bottom portion of the housing. The output section is connected to the movable cylinder. Thus, the rate of opening of the choke valve can be increased immediately after the start of engine warming-up operation, and reduced as approaching the completion of engine warming-up operation.
Description
Related application data
Here mode by reference in conjunction with the application based on Japan at the full content of first to file No.2004-216996,2004-216997,2004-216998,2004-216999,2004-217000 and 2004-238748.
Technical field
The present invention relates to be used for the improvement of the automatic choke system of Carburetor, it comprises: be connected to wax pattern (wax-type) temperature detection part on the motor; And output, it provides connection between the chock plate of temperature detection part and Carburetor, and is used for bringing drill to an end in response to the hot joining of temperature detection part and makes to open chock plate.
Background technique
This automatic choke system that is used for Carburetor is known, for example, opens among the clear No.57-182241 disclosed in fact as Japanese Utility Model.
At the automatic choke system that is used for Carburetor of routine, the wax pattern temperature detection part has: cylinder; Piston, it is supported in this cylinder slidably and has an end that stretches out cylinder; Wax, it is contained in this movable cylinder, and this movable cylinder and fixed piston are relative to each other moved vertically; And Returnning spring, its direction along compression wax promotes described movable cylinder and fixed piston.Described cylinder is installed on the motor and makes wax face the high-temperature part of motor, and described piston is connected to output.In this automatic choke system, wax always is exposed to the high-temperature part of motor, makes that to receive the speed of heat from motor constant, and it is also constant along with the progress of engine warm machine operation therefore to open the speed of chock plate.
But,, need after the engine warm machine operation begins, increase immediately and open the speed of chock plate, and this speed is reduced when warming-up is operated approaching finishing in order suitably to carry out the warming-up operation of motor.
Summary of the invention
In view of the foregoing make the present invention, and the purpose of this invention is to provide a kind of automatic choke system that is used for Carburetor, it can change the speed of opening chock plate in the above described manner.
To achieve these goals, in accordance with a first feature of the invention, provide a kind of automatic choke system that is used for Carburetor, it comprises: be connected to the wax pattern temperature detection part on the motor; And output, it provides connection between the chock plate of temperature detection part and Carburetor, and be used for bringing drill to an end and make to open chock plate in response to the hot joining of temperature detection part, wherein this temperature detection part comprises: have the cylindrical shell of bottom, it is connected on the motor and high temperature side is pointed in its bottom; The movable cylinder that has the bottom; Fixed piston, it is supported in this movable cylinder slidably and has an end that stretches out this movable cylinder; Wax, its mode with sealing is contained in this movable cylinder, and makes this movable cylinder and fixed piston relative to each other move vertically; And Returnning spring, its direction along compression wax promotes this movable cylinder and fixed piston, this movable cylinder outer end of fixed piston therein abuts against under the state of internal surface of described housing bottom, be slidably received within this housing, described output is connected on this movable cylinder; Wherein, described housing comprises: first portion, this first portion have high heat conductivity and comprise described bottom; And second portion, this second portion has thermal insulating properties and is connected to this first portion, and described movable cylinder moves by side to this second portion one side in response to the thermal expansion of wax from this first portion one.
By first feature of the present invention, the fixed piston that is arranged in the housing of temperature detection part contacts with the internal surface of described bottom, the heat that receives from motor at the internal surface place of this bottom in the operating process of motor is maximum, and the movable cylinder that accommodates wax moves away described bottom in housing in response to the thermal expansion of wax.Therefore, bigger when the engine warm machine operation has just begun by the wax in the movable cylinder from the heat that housing receives, and reduce along with the progress of engine warm machine operation.As a result, opening after the engine warm machine operation begins of chock plate quickened immediately, to suppress the excessive concentration of fuel in air one fuel mixture effectively; And the speed of opening of chock plate reduces when warming-up is operated approaching finishing.Therefore, the warming-up operation can stably continue.In addition, can also prevent that wax (that is after, chock plate is opened fully) after the warming-up operation is finished from undue thermal degradation taking place.
According to second feature of the present invention, a kind of automatic choke system that is used for Carburetor is provided, it comprises: be connected to the wax pattern temperature detection part on the motor; And output, it provides connection between the chock plate of temperature detection part and Carburetor, and be used for bringing drill to an end in response to the hot joining of temperature detection part and do to open chock plate, wherein temperature detection part comprises: have the cylindrical shell of bottom, it is connected on the motor; The movable cylinder that has the bottom; Fixed piston, it is supported in this movable cylinder slidably and has an end that stretches out this movable cylinder; Wax, its mode with sealing is contained in the movable cylinder, and makes described movable cylinder and fixed piston relative to each other move vertically; And Returnning spring, its direction along compression wax promotes this movable cylinder and fixed piston, this movable cylinder outer end of fixed piston therein abuts against under the state of internal surface of described housing bottom, be slidably received within the described housing, described output is connected on this movable cylinder, described housing comprises: first portion, this first portion have high heat conductivity and comprise described bottom; And second portion, this second portion has thermal insulating properties and is connected to this first portion, and described movable cylinder moves by side to this second portion one side in response to the thermal expansion of wax from this first portion one, thus, described casing structure becomes to make the heat that received by wax along with movable cylinder moves and reduces along the direction away from housing bottom.
By second feature of the present invention, described movable cylinder moves away from described bottom in response to wax along with the thermal expansion of the progress of engine warm machine operation.Because movable cylinder moves by this way, so the heat that is received by the wax in the movable cylinder reduces.Therefore, the speed of opening of chock plate can be after the engine warm machine operation begins increases immediately, and reduces when finishing at the engine warm machine operation, thereby makes the warming-up stable operation, has avoided the increase of fuel concentration in air-fuel mixture simultaneously.After the engine warm machine operation was finished, promptly after chock plate was opened fully, the heat that is received by wax further reduced, thereby prevented the undue thermal degradation of wax.
By the first and secondth feature of the present invention, heat is sent to the first portion with high thermal conductivity of housing effectively from motor.Therefore, especially after the engine warm machine operation begins soon, the wax in the movable cylinder receives heat fast and begins to expand so that the opening of chock plate from first portion, has therefore suppressed the excessive concentration of fuel in air-fuel mixture effectively.Movable cylinder is along with the progress of engine warm machine operation moves to second portion from first portion in housing, thereby the progress of operating along with warming-up has reduced the heat that is received from housing by the wax in the movable cylinder effectively.Therefore, in warming-up operation when finishing, the opening speed and can suitably reduce of chock plate, thus warming-up stable operation ground is continued.After the warming-up operation was finished, the heat that is received by wax further reduced, and therefore further helped to prevent the undue thermal degradation of wax.
According to the 3rd feature of the present invention, except second feature, the first portion of described housing is a cup-shaped, and described second portion is a cylindricality, and is connected to the opening end of this first portion.
According to the 4th feature of the present invention, except first or second feature, described second portion is positioned at a side relative with described bottom, and described second portion and the insulator that is plugged between described motor and the Carburetor are integrally moulded.
By the 4th feature of the present invention, the housing of described temperature detection part comprises: first portion, and it has high heat conductivity and includes described bottom; And second portion, it is positioned on the side relative with the bottom of described first portion, has thermal insulating properties and is connected in the first portion.Therefore, the heat that produces in motor mainly is delivered to wax in the cylinder by first portion.Therefore, the characteristic that shape that can be by only selecting first portion and position change temperature detection part, thus this choke system can be applicable to various types of motors.
And, because first portion and be plugged in motor and Carburetor between heat insulating part integrally formed, therefore the housing of temperature detection part can be supported on the motor and need not any special supporting element, thereby simplifies the structure and help to reduce the cost of automatic choke system.
According to the 5th feature of the present invention, except the 4th feature, the carriage and the described insulator that are used to support output are integrally moulded.
By the 5th feature of the present invention, the carriage that is used to support output also forms with described insulator.Therefore, described carriage can be supported on the motor and supporting element that need not any special use, thereby simplifies the structure and help further to reduce the cost of automatic choke system.
According to the 6th feature of the present invention, except first or second feature, described temperature detection part is arranged near the suction port, and this suction port is formed in the cylinder head of motor.
By the 6th feature of the present invention, in the power operation process, the outer peripheral portion of suction port is always by the air inlet cooling that flows through suction port in the cylinder head.Therefore, can keep not being subjected to the influence of the fluctuation of load on the motor corresponding to the temperature characteristic of the progress of warming-up operation.Therefore, being arranged near the temperature detection part of suction port can suitably operate according to the progress of warming-up operation, and is not subjected to the influence of the fluctuation of load on the motor.Therefore, always opening of chock plate can suitably be controlled, thereby helps to improve the emission performance of fuel consumption and motor.
According to the 7th feature of the present invention, except the 6th feature, the perisporium by suction port and formed an accommodating chamber from the leg that a side of this perisporium rises, and temperature detection part is arranged in this accommodating chamber.
By the 7th feature of the present invention, can pass through the length of the leg of selection accommodating chamber, regulate the operating characteristics of temperature detection part with respect to the progress of engine warm machine operation, thereby suitably set the zone of the internal surface of accommodating chamber in the face of temperature detection part.
According to the 8th feature of the present invention, except first or second feature, described output comprises: first bar and second bar, they are supported in the described carriage pivotally by common axis, this bracket support is on motor, first bar is brought drill to an end work in response to the hot joining of temperature detection part and is operated, and second bar is operated in the mode that is associated with chock plate; Bearing part (abuttingportion), thus they be arranged in first bar and second bar mutually against, and described bearing part can move towards each other and mutually away from moving; Connect spring, its be connected on the described bearing part so that bearing part along mutually against direction move; And before chock plate is opened fully, the hot joining of temperature detection part is brought drill to an end and is done to be transmitted to second bar along the direction of opening chock plate from first bar by connecting spring, and after chock plate is opened fully, bringing drill to an end by the hot joining of temperature detection part only makes first bar rotate, thus the bearing part opposing connect spring the setting load and mutually away from moving.
By the 8th feature of the present invention, when the further heat that receives from motor of temperature detection part, when causing stroke after finishing with the engine warm machine operation of opening fully at chock plate, have only first bar to bring drill to an end and do to rotate by the hot joining of temperature detection part, thus the bearing part opposing connect spring the setting load and mutually away from moving.Therefore, the stroke interaction energy of crossing of temperature detection part is absorbed by the distortion that connects spring, avoiding the over-stress in the element from the automatic choke system to the chock plate, thereby guarantees the excellent durability of element.And, therefore because relative to each other rotating first and second bars are installed on the carriage by common axis, can reduce the number of elements in the output and the structure of simplification device.
According to the 9th feature of the present invention, except first or second feature, one adjuster device is connected to the closure of Carburetor, thereby when motor stops, controlling closure, and when motor moves, control closure so that it is closed to predetermined aperture corresponding to the setting rotating speed of motor so that it is opened; And a chock plate positive opening device is arranged between closure and the chock plate, with from the fully open position to unloaded open position closed throttle positive opening chock plate relatively.
By the 9th feature of the present invention, when motor is in cold and during the state that stops, automatic choke system allows chock plate to open, and adjuster device remains on full open position with closure.In the unloaded process after the engine cold starting and then, closure is closed from the fully open position to unloaded open position by the operation of adjuster device.In this closure opening procedure, chock plate is forced to discharge to half-open position from the fully open position by the operation of chock plate positive opening device.Therefore, the air-fuel mixture that will produce in the air inlet path is adjusted to the proportions of ingredients that is suitable for the motor zero load, thereby has guaranteed stable unloaded state, and has avoided the conservation of fuel performance because opening of chock plate postpones and deterioration.
According to the tenth feature of the present invention, except the 9th feature, described output and chock plate positive opening device are arranged to, feasible not opening and can be hindered by another by output and one of them chock plate that carries out of chock plate positive opening device.
By the tenth feature of the present invention, described output and chock plate positive opening device can suitably be controlled opening of chock plate and can not interfere mutually.
These and other purposes, features and advantages of the present invention become clear by the detailed description to the preferred embodiment of the present invention with reference to the accompanying drawings.
Description of drawings
Fig. 1 is the biopsy cavity marker devices front view of the longitudinal component of general purpose engine;
Fig. 2 is the zoomed-in view of the major component of motor shown in Fig. 1;
Fig. 3 cuts open the sectional view of getting along Fig. 2 center line 3-3;
Fig. 4 cuts open the sectional view of getting along Fig. 2 center line 4-4;
Fig. 5 cuts open the sectional view of getting along Fig. 2 center line 5-5;
Fig. 6 cuts open the sectional view of getting along Fig. 2 center line 6-6;
Fig. 7 is the view that is used to illustrate corresponding to the operation of the automatic choke system of Fig. 6;
Fig. 8 is another view that is used to illustrate the operation of automatic choke system;
Fig. 9 is still another view of the operation that is used to illustrate automatic choke system;
Figure 10 is the zoomed-in view of the temperature detection part of the automatic choke system shown in Fig. 6;
Figure 11 is the view that is used to illustrate corresponding to the operation of Figure 10;
Figure 12 is the schematic side view of adjuster device;
Figure 13 is the side view that comprises the part of chock plate positive opening device;
Figure 14 is the view that is used to illustrate corresponding to the operation of the chock plate positive opening device of Figure 13;
Figure 15 is another view that is used to illustrate the operation of chock plate positive opening device; And
Figure 16 is still another view of the operation that is used to illustrate chock plate positive opening device.
Embodiment
The preferred embodiments of the present invention are described below with reference to accompanying drawings.
In Fig. 1 to Fig. 3, reference letter E represents the four stroke engine as the power source of different operating machine.Motor E comprises: crankcase 2, and it vertically supports bent axle 1; Cylinder block 3, its level stretch out crankcase 2 and have cylinder thorax 3a; With cylinder head 4, the outer end portion of itself and cylinder block 3 is integrally formed.In cylinder head 4, be provided with: suction port 6i and relief opening 6e, they open and close by intake valve 7i and exhaust valve 7e respectively; With air door operation chamber 9, it holds the valve mechanism 8 that is used to operate intake valve 7i and exhaust valve 7e.The housing 5 that is used to close air door operation chamber 9 joins the end face of cylinder head 4 to.
The outer end of suction port 6i and relief opening 6e is respectively at a side of cylinder head 4 and relative another side opening.Carburetor C with the air inlet path 11 that is communicated with suction port 6i passes a bolt (pass-through bolt) 12 and a described engage sides by a plurality of, and a tabular insulator 10 is plugged between the described side and Carburetor C of cylinder head 4.Insulator 10 is made by the thermosetting synthetic resin with high thermal insulating properties (for example, phenolic resin).Insulator 10 suppresses the heat to Carburetor C transmission from motor E.The exhaust silencer 14 that is communicated with relief opening 6e is connected to the described another side of cylinder head 4.Fuel tank 17 and recoil type starter 15 are arranged on the top of motor E.The spark plug that is connected in the cylinder head 4 is twisted in reference character 16 expressions among Fig. 1.
As Fig. 2 and shown in Figure 4, air-strainer 13 is connected on the Carburetor C, is communicated with the upstream portion with air inlet path 11.Chock plate 19 is arranged in the upstream portion in air inlet path 11 of Carburetor C, and closure 20 is arranged in the downstream part in air inlet path 11.In addition, a fuel nozzle (not shown) being set opens with the position between two valves 19 and 20.Chock plate 19 and closure 20 are the butterfly valves that are supported on respectively on valve stem 19a and the 20a, and these two valve stem 19a and 20a are supported on the Carburetor C rotationally.
With reference to Fig. 4, the valve stem 19a of chock plate 19 puts towards a lateral deviation of the center line in air inlet path 11; And chock plate 19 tilts with respect to the center line in air inlet path 11, thereby when chock plate 19 was closed fully, the big radius of gyration side of chock plate 19 was positioned at the downstream of the little radius of gyration side of chock plate 19.Choke rod 22 is connected with the outer end portion of the valve stem 19a that stretches out Carburetor C.Choke rod 22 is columnar members of hollow, thereby and can rotate with respect to valve stem 19a round valve stem 19a assembling.Choke rod 22 is connected with valve stem 19a is inner by known safety spring (not shown).The fully open position of chock plate 19 and fully closed position by choke rod 22 with respect to the retainer (not shown) on the outer wall section that is arranged on Carburetor C against limiting.
When the air-intake negative-pressure of motor E surpasses predetermined value, and chock plate 19 is in and closes fully or slightly during closing state, chock plate 19 opens to such aperture, in this aperture, (A) moment of rotation and (2) difference and the moment of rotation balance that (B) produces that produces by the air-intake negative-pressure on the big radius of gyration side that acts on chock plate 19 in (1) by above-mentioned safety spring by the moment of rotation of the generation of the air-intake negative-pressure on the little radius of gyration side that acts on chock plate 19.
The chock plate Returnning spring 21 of closing the moving choke rod 22 of thruster towards chock plate 19 is connected with choke rod 22.Be used for being arranged in the face of choke rod 22 according to the automatic choke system A that opens that the temperature variation of motor E is automatically controlled chock plate 19.
With reference to Fig. 2 to Figure 11 automatic choke system A is described below.
At first with reference to Fig. 2 to Fig. 6, automatic choke system A comprises: temperature detection part 25, and it especially receives heat from a suction port 6i part on every side from the cylinder head 4 of motor E; With output 26, it is connected to choke rod 22 with temperature detection part 25, and along with chock plate 19 passes to choke rod 22 along the mobile hot joining of temperature detection part 25 is brought drill to an end of opening direction.Temperature detection part 25 has cylindrical shell 30, and this housing is arranged in the accommodating chamber 27, and this chamber is formed by the perisporium 4a of suction port 6i and the leg 4b (seeing Fig. 2 and Fig. 3) that rises from the top of this perisporium 4a.Accommodating chamber 27 is opened in a side of cylinder head 4, thereby forms import at the one end, as suction port 6i.Accommodating chamber 27 is closed at the other end place at the center of facing cylinder head 4.And, but accommodating chamber 27 is considered the assembling performance of the formability of leg 4b and temperature detection part 25 and is suitably opened in a side.
The 30a of first portion is arranged to make the inside of its bottom 30a ' in the face of accommodating chamber 27, that is, and and the core of cylinder head 4 (high-temperature part).Bottom 30a ' and the perisporium of the 30a of first portion is arranged to make them to contact with the internal surface of accommodating chamber 27, or is positioned to also have very little gap betwixt away from this internal surface.Second portion 30b is arranged on the inlet side of accommodating chamber 27, that is, and and away from a side at the center of cylinder head 4.
As shown in figure 10, temperature detection part 25 comprises: have the movable cylinder 31 of bottom, it is made by the metal with high thermal conductivity (for example, aluminium); Guide 32, its flanging join on the opening end of movable cylinder 31; Shaft-like fixed piston 33, it is supported on the guide 32 slidably therefrom to pass through; Flexible bag 34, it covers the fixed piston 33 in the movable cylinder 31, and its opening end is clipped between movable cylinder 31 and the guide 32 in a fluid tight manner; And wax 35, thereby its mode with sealing is contained in covering flexible bag 34 in the movable cylinder 31.Movable cylinder 31 is assemblied among the 30a of first portion of housing 30 slidably, and the maintenance of the outer end of fixed piston 33 contacts with the internal surface of the bottom 30a ' of the 30a of first portion of housing 30.
When wax 35 is heated, thereby it expands extruding and pressure elasticity bag 34, makes fixed piston 33 be pushed out guide 32.But, because fixed piston 33 can not move when the internal surface of the bottom 30a ' of its outer end and the 30a of first portion keeps in touch, therefore movable cylinder 31 is subjected to the reaction force from fixed piston 33, thereby advances in the 30a of first portion in the direction of arrow F to move away bottom 30a ' (seeing Figure 11).
Be positioned at guide 32 opposite sides on half outer surface of movable cylinder 31 have minor diameter, to form small diameter portion 31a, be equipped with distance ring 36 around this small diameter portion.One spiral Returnning spring 38 is arranged under pressured state between the holder 37 and insulator 10 that contacts with distance ring 36, thereby promotes movable cylinder 31 by distance ring 36 towards the outer end of fixed piston 33.Therefore, holder 37 is clamped between distance ring 36 and the Returnning spring 38.
As shown in Figure 5 and Figure 6, output 26 comprises: bar 43, and it is connected to holder 37 through an insulator 10 and an end 43a; But and first bar 41 of independent rotation and second bar 42, they are supported on by common axis 40 on the both side surface of carriage 10a, this carriage and insulator 10e are integrally formed.The other end 43b of bar 43 bends to L shaped, and is connected to first bar 41.By advance F in the axial direction the motion of bar 43 along with movable cylinder 31, first bar 41 rotates along the direction of the R of arrow shown in Fig. 6.Being clamped in by the expansion end 43a with bar 43 between the end face of holder 37 and movable cylinder 31 is connected on the holder 37 bar 43.
The operating arm 42c and second bar 42 are integrally formed, and this operating arm operatively action reception pin 22a with choke rod 22 is relative.When second bar 42 when the direction of arrow R is rotated, operating arm 42c makes choke rod 22 rotate along the direction of opening chock plate 19.
The adjuster device G of the opening and closing that are used for controlling automatically closure 20 is described with reference to Figure 12 below.Throttle operation bar 23 is fixed on the outer end of valve stem 20a of closure 20.The long-armed part 52a of governor lever 52 is fixed on the outer end of the rotation support shaft 51 that is supported on the motor E, and is connected to throttle operation bar 23 by connecting rod 53.Output controlling rod 56 is supported on motor E and other element, thereby can turn to complete load situation from the idle position, and is connected to governor lever 52 by spring for governor 54.Spring for governor 54 always promotes closure 20 along the direction of opening throttle 20.By making output controlling rod 56 turn to the load on spring that complete load situation or backward rotation increase and reduce spring for governor 54 from the idle position.
The output shaft 55a of the known centrifugal governor 55 that is driven by the bent axle 1 of motor E is connected on the galianconism part 52b of governor lever 52.The output of centrifugal governor 55 increases along with the increase of motor E rotating speed, this output along the directive effect of close the throttle 20 on galianconism part 52b.
When motor E stopped, throttle operation bar 50 remained on closure 20 closed position C places by the setting load of spring for governor 54.When motor E moves,, automatically control opening of closure 20 by in the torque of the governor lever 52 that produces by the output of centrifugal governor 55 and corresponding to the balance between the torque of the governor lever 52 of the setting load of spring for governor 54.
As Fig. 2 and shown in Figure 13, driving arm 59 is integrally formed with throttle operation bar 50, and the slave arm 60 that is associated with driving arm 59 is integrally formed with choke rod 33.When closure 20 from the fully open position when unloaded open position rotates, driving arm 59 is opened direction along chock plate 19 and is pushed slave arm 60.Driving arm 59 and slave arm 60 constitute chock plate positive opening device 58.
Current embodiment's operation will be described now.
When motor E is in cold and during halted state, wax 35 in the temperature detection part 25 is in contraction state, and therefore movable cylinder 31 remains on retracted position by the elastic force of Returnning spring 38, and this retracted position is near the bottom 30a ' of the 30a of first portion of housing 30, as shown in figure 10.Therefore, the operating arm 42c of second bar 42 of output 26 remains on the position away from choke rod 22, and the thrust of choke rod 22 by chock plate Returnning spring 21 remains on chock plate 19 closed position places, as shown in Figure 6.
On the other hand, owing to centrifugal governor 55 is not worked, so closure 20 remains on full open position (seeing Figure 13) by spring for governor 54.In this state, when output controlling rod 56 was arranged on the idle position, the load of spring for governor 54 was set to minimum value or zero.
When bent axle 1 is rotated when piloting engine E, in Carburetor C, produce high negative in the air inlet path 11 in chock plate 19 downstreams, thereby spray quite a large amount of fuel by the fuel nozzle of opening in the corresponding position, to increase the concentration of fuel in the air-fuel mixture that produces in air inlet path 11, E reposefully therefore pilots engine.
When motor E starts, the output that centrifugal governor 55 produces corresponding to the rotating speed of bent axle 1.Governor lever 52 turns to such position, promptly, make by this output produce act on the governor lever 52 torque with corresponding to the minimum load of spring for governor 54, act on the mutual balance of torque on the governor lever 52, thereby closure 20 is automatically closed towards unloaded open position.Resist the thrust of chock plate Returnning spring 21 then with the driving arm 59 of throttle operation bar 23 one and push slave arm 60 with choke rod 22 one, thereby chock plate 19 is discharged, towards half-open position from complete closed position as Figure 14 and shown in Figure 15.At this moment, the action of choke rod 22 receives pin 22a only moves away from output 26 in automatic choke system A second bar 42, and therefore output 26 does not interfere the pressure valve of the chock plate 19 that is caused by driving arm 59 to be opened.Therefore, the air-fuel mixture that produces in air inlet path 11 is adjusted to the proportions of ingredients that is suitable for motor E zero load, thereby guarantees stable unloaded state and avoid causing owing to the delay of opening chock plate 19 deterioration of low fuel consumption (mileage).
If output controlling rod 56 turns to suitable load situation from the idle position in the warming-up process of motor E, be applied on the motor E with load working machine etc., then the load of spring for governor 54 just correspondingly increases, and makes the aperture of closure 20 of the mutual balance of output of the load of spring for governor 54 and centrifugal governor 55 with increase.Increase by the aperture that makes closure 20, driving arm 59 is with respect to slave arm 60 withdrawals.But the slave arm 60 of choke rod 22 is followed driving arm 59 withdrawals by the Driving force of chock plate Returnning spring 21, thereby chock plate 19 is closed once more.The result, when the air-intake negative-pressure that produces in air inlet path 11 downstream position exceeds predetermined value, chock plate 19 opens to such aperture, balance each other with the torque that in choke rod 22, produces by above-mentioned safety spring in the difference of this aperture, thereby prevent fuel concentration excessive in the air-fuel mixture of generation in the air inlet path 11 and guarantee good warm-up mode by the torque of the air-intake negative-pressure generation of the air-intake negative-pressure torque that produces and the little radius of gyration side that acts on chock plate 19 of the big radius of gyration side that acts on chock plate 19.
Along with the warming-up operation progress of motor E, the temperature of cylinder head 4 raises; The temperature detection part 25 that is arranged near the accommodating chamber 27 the suction port 6i is heated by the inwall of accommodating chamber 27; Wax 35 thermal expansions in the movable cylinder 31 with the extruding flexible bag 34, thereby outwards promote fixed piston 33; The reaction force of fixed piston 33 advances the elastic force of movable cylinder 31 opposing Returnning springs 38 in the direction of arrow F; And this progressive motion makes first bar 41 rotate along the direction of arrow R by bar 43.Because first bar 41 initially remains on coupled condition with second bar 42 by the thrust that is connected spring 44, make bearing part 41a and 42a mutually against, therefore second bar 42 rotates with first bar 41, and operating arm 42c makes action receive pin 22a (promptly, choke rod 22) direction opened along chock plate 19 of the thrust of opposing chock plate Returnning spring 21 is rotated, as shown in Figure 7.
Therefore, the aperture of chock plate 19 increases according to the rising of temperature in the accommodating chamber 27, reduces the negative pressure on the fuel nozzle in the air inlet path 11 with the progress of operating corresponding to the warming-up of motor E, thereby reduces the fuel quantity that sprays by fuel nozzle.Therefore, can suitably proofread and correct in air inlet path 11 air-fuel ratio in the air-fuel mixture that produces.When the warming-up operation of motor E was finished, it is enough high that the temperature in the accommodating chamber 27 becomes, thereby control closure 19 so that it is opened fully, as shown in Figure 8.
In warming-up process, as shown in figure 16, slave arm 60 is opened along with the valve of chock plate 19 and is moved away the driving arm 59 of throttle operation bar 23, and can not interfere with driving arm 59.Therefore, can suitably open chock plate 19.
Afterwards, when the temperature of cylinder head 4 further raises so that the temperature in the accommodating chamber 27 is when raising, wax 35 further expanded by heating so that movable cylinder 31 too advance, thereby make first bar 41 by the direction rotation of bar 43 along arrow R.But, because the choke rod 22 that is in a fully open position has limited second bar 42 and has further rotated, therefore have only first bar 41 in the connection spring 44 that stretches, to rotate along the direction of arrow R, thereby the bearing part 41a that makes first bar 41 moves away the bearing part 42a of second bar 42, as shown in Figure 9.Therefore, the mistake stroke action of the movable cylinder 31 of temperature detection part 25 is connected this stretching absorption of spring 44.The arbitrary load that this means the setting load that surpass to connect spring 44 can not act on from automatic choke system A to chock plate on 19 the element.Therefore, can avoid in each element, producing any over-stress, thereby guarantee the serviceability of element.And, because relative to each other rotating first bar 41 and second bar 42 are installed on the carriage 10a by common axis 40, have therefore reduced the quantity of element in the output 26 and simplified the structure.
When the operation of motor E stopped then, as long as the condition of high temperature of motor E continues, accommodating chamber 27 just remained on the condition of high temperature.In this state, thereby temperature detection part 25 operations keep the forward travel state of movable cylinder 31, and keep chock plate 19 open modes by output 26.Therefore, in this state, the slave arm 60 of choke rod 22 is positioned to the driving arm 59 away from throttle operation bar 23, thereby slave arm 60 can not interfered closure 20 rotation towards the fully open position under the load effect of spring for governor 54.Therefore, when motor E reset in the condition of high temperature, the open mode that keeps chock plate 19 to be preventing fuel concentration excessive in air-fuel mixture, thereby guaranteed the good property reset.
If motor E is cooled after stopping, then movable cylinder 31 is because the reset operation of the pyrocondensation of wax 35 and Returnning spring 38 and withdrawal in temperature detection part 25.Output 26 allows choke rod 22 to rotate along chock plate 19 closing directions by chock plate Returnning spring 21 then.
In the running of motor E, the outer peripheral portion of suction port 6i is always flowed into the air inlet cooling of suction port 6i in the cylinder head 4.Therefore, can keep the corresponding temperature characteristic of progress with warming-up operation, and do not acted on the influence of the fluctuation of the load on the motor E.Therefore, near the temperature detection part 25 that is arranged in the suction port 6i can be according to the progress of warming-up operation and suitably operation, and is not acted on the influence of the fluctuation of the load on the motor E.Therefore, opening of chock plate 19 be can always suitably control, thereby fuel consumption and the emission performance of motor E helped to improve.
Particularly, under temperature detection part 25 is arranged in situation in the accommodating chamber 27, this accommodating chamber is formed on the cylinder head 4 by the perisporium 4a of suction port 6i and the leg 4b that rises from this perisporium 4a one side, temperature detection part 25 can be by selecting accommodating chamber 27 with respect to the operating characteristics of the warming-up operation progress of motor E the length of leg 4b regulate, thereby suitably set the zone in the face of temperature detection part 25 of accommodating chamber 27 internal surfaces.
In the housing 30 that has the bottom of temperature detection part 25, by near the heat maximum of the bottom 30a ' the center of cylinder head 4 from cylinder head 4 receptions, fixed piston 33 abuts against bottom 30a ' internal surface, and the movable cylinder 31 that accommodates wax 35 advances along direction F in housing 30, to move away bottom 30a ' in response to the thermal expansion of wax 35.Therefore, bigger soon after motor E warming-up operation beginning by the wax in movable cylinder 31 35 from the heat that housing 30 receives, and reduce along with the progress of warming-up operation.
Particularly, housing 30 comprises: the 30a of first portion, and it has bottom 30a ' and is made by the metal with high thermal conductivity; With second portion 30b, it is arranged to relative with bottom 30a ' and has high thermal insulating properties, thereby can further improve the above-mentioned trend of the hot joining receipts characteristic of wax 35.That is, when movable cylinder 31 advanced, the part of movable cylinder 31 moved to the position of the second portion 30b side with high thermal insulating properties, thereby further reduced the heat that is received by wax 35.The result, after the operation beginning of motor E warming-up soon, wax 35 in the movable cylinder 31 begins to expand by the heat that receives apace from the first portion of housing 30, so that open chock plate 19, has therefore suppressed fuel concentration excessive in air-fuel mixture effectively.And movable cylinder 31 progress along with warming-up operation in housing 30 moves to second portion 30b from the 30a of first portion, thereby reduces the heat that the progress along with the warming-up operation is received from housing 30 by the wax in the movable cylinder 31 35 effectively.Therefore, when the warming-up operation is finished, can suitably reduce the speed of opening of chock plate 19 nearly, thereby stably continue the warming-up operation.The heat that is received by wax 35 further reduces after the warming-up operation is finished, thereby further helps to prevent the undue thermal degradation of wax 35.
And, because it is integrally formed to have the carriage 10a and the insulator 10 of the second portion 30b of high thermal insulating properties and the output 26 that pivot supports first bar 41, this insulator is plugged between cylinder head 4 and the Carburetor C, therefore the housing 30 and the carriage 10a of temperature detection part 25 can be supported on the cylinder head 4, and need not any special supporting element.Therefore, thereby can reduce the quantity simplified structure of element, and help to reduce the cost of automatic choke system A.
The present invention is not limited to the foregoing description, but can carry out various changes to design in the situation that does not break away from theme of the present invention.For example, as fixed cylinder, maintenance contacts with the bottom 30a ' of the 30a of first portion of housing 30 with movable cylinder 31; And fixed piston 33 is connected on holder 37 or the bar 43 as moveable piston, so that piston 33 advances when thermal expansion takes place wax 35.
Claims (10)
1, a kind of automatic choke system that is used for Carburetor, it comprises:
Be connected to the wax pattern temperature detection part on the motor; With
Output, it provides connection between the chock plate of described temperature detection part and Carburetor, and is used for bringing drill to an end in response to the hot joining of described temperature detection part and does and open chock plate,
Wherein, this temperature detection part comprises:
The cylindrical shell that has the bottom, it is connected on the motor and the high-temperature part of its bottom sensing motor;
The movable cylinder that has the bottom;
Fixed piston, it is supported in the described movable cylinder slidably and has an end that stretches out this movable cylinder;
Wax, its mode with sealing is contained in the described movable cylinder, and makes this movable cylinder and fixed piston relative to each other move vertically; And
Returnning spring, its direction along compression wax promotes described movable cylinder and fixed piston,
The described movable cylinder outer end of fixed piston therein abuts against under the state of internal surface of this housing bottom, is slidably received within the housing,
Described output is connected on this movable cylinder;
Described housing comprises: first portion, this first portion have high heat conductivity and comprise described bottom; And second portion, this second portion has thermal insulating properties and is connected to this first portion, and described movable cylinder moves by side to this second portion one side in response to the thermal expansion of wax from this first portion one.
2, a kind of automatic choke system that is used for Carburetor, it comprises:
Be connected to the wax pattern temperature detection part on the motor; With
Output, it provides connection between the chock plate of described temperature detection part and Carburetor, and is used for bringing drill to an end in response to the hot joining of temperature detection part and does and open chock plate,
Wherein, this temperature detection part comprises:
Have the cylindrical shell of bottom, it is connected on the motor;
The movable cylinder that has the bottom;
Fixed piston, it is supported in the described movable cylinder slidably and has an end that stretches out this movable cylinder;
Wax, its mode with sealing is contained in the described movable cylinder, and makes described movable cylinder and fixed piston relative to each other move vertically; And
Returnning spring, its direction along compression wax promotes described movable cylinder and fixed piston,
The described movable cylinder outer end of fixed piston therein abuts against under the state of internal surface of described housing bottom, is slidably received within the described housing,
Described output is connected on the described movable cylinder,
Described housing comprises: first portion, this first portion have high heat conductivity and comprise described bottom; And second portion, this second portion has thermal insulating properties and is connected to this first portion, and described movable cylinder moves by side to this second portion one side in response to the thermal expansion of wax from this first portion one; Thus, described casing structure becomes to make the heat that received by wax along with described movable cylinder moves and reduces along the direction away from housing bottom.
3, the automatic choke system that is used for Carburetor as claimed in claim 2 is characterized in that, described first portion is a cup-shaped, and described second portion is a cylindricality, and this second portion is connected to the opening end of this first portion.
4, the automatic choke system that is used for Carburetor as claimed in claim 1 or 2, it is characterized in that, described second portion is positioned at a side relative with described bottom, and described second portion and the insulator that is plugged between described motor and the Carburetor are integrally moulded.
5, the automatic choke system that is used for Carburetor as claimed in claim 4 is characterized in that, one to be used to support the carriage and the described insulator of described output integrally moulded.
6, the automatic choke system that is used for Carburetor as claimed in claim 1 or 2 is characterized in that, described temperature detection part is arranged near the suction port, and this suction port is formed in the cylinder head of described motor.
7, the automatic choke system that is used for Carburetor as claimed in claim 6 is characterized in that, formed an accommodating chamber by the perisporium of described suction port and the leg that rises from this perisporium, and described temperature detection part is arranged in this accommodating chamber.
8, the automatic choke system that is used for Carburetor as claimed in claim 1 or 2, it is characterized in that, described output comprises: first bar and second bar, they pivot by common axis and are supported in the carriage, this bracket support is on motor, this first bar is brought drill to an end work in response to the hot joining of temperature detection part and is operated, and this second bar is operated in the mode that is associated with described chock plate; Bearing part, thus they be arranged in this first bar and second bar mutually against, and described bearing part can move towards each other and mutually away from moving; Connect spring, its be connected on the described bearing part so that bearing part along mutually against direction move; And wherein, before chock plate is opened fully, the hot joining of described temperature detection part is brought drill to an end and is done to be transmitted to second bar along the direction of opening chock plate from first bar by connecting spring, and after chock plate is opened fully, bringing drill to an end by the hot joining of temperature detection part only makes first bar rotate, thus the bearing part opposing connect spring the setting load and mutually away from moving.
9, the automatic choke system that is used for Carburetor as claimed in claim 1 or 2, it is characterized in that, one adjuster device is connected on the closure of described Carburetor, thereby when motor stops, controlling this closure so that it is opened, and when motor moves, make this closure be closed to predetermined aperture corresponding to the setting rotating speed of motor; And wherein, a chock plate positive opening device is arranged between closure and the chock plate, opens chock plate with basis forcibly from the fully open position to unloaded open position closed throttle.
10, the automatic choke system that is used for Carburetor as claimed in claim 9, it is characterized in that, described output and chock plate positive opening device are arranged to, feasible not opening and can be hindered by another by output and one of them chock plate that carries out of chock plate positive opening device.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004216996A JP4145844B2 (en) | 2004-07-26 | 2004-07-26 | Vaporizer auto choke device |
| JP2004216996 | 2004-07-26 | ||
| JP2004216997 | 2004-07-26 | ||
| JP2004216998 | 2004-07-26 | ||
| JP2004217000 | 2004-07-26 | ||
| JP2004216999 | 2004-07-26 | ||
| JP2004238748 | 2004-08-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1727661A CN1727661A (en) | 2006-02-01 |
| CN100465424C true CN100465424C (en) | 2009-03-04 |
Family
ID=35903054
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520114394 Expired - Fee Related CN2929215Y (en) | 2004-07-26 | 2005-07-25 | Automatic choke system for carburetor |
| CNB2005100855585A Expired - Fee Related CN100465424C (en) | 2004-07-26 | 2005-07-25 | Automatic choke system for carburetor |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520114394 Expired - Fee Related CN2929215Y (en) | 2004-07-26 | 2005-07-25 | Automatic choke system for carburetor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4145844B2 (en) |
| CN (2) | CN2929215Y (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2405760T3 (en) | 2004-07-26 | 2013-06-03 | Honda Motor Co., Ltd. | Automatic throttle system for carburetor |
| JP4145844B2 (en) * | 2004-07-26 | 2008-09-03 | 本田技研工業株式会社 | Vaporizer auto choke device |
| JP4732378B2 (en) | 2007-02-12 | 2011-07-27 | 本田技研工業株式会社 | Engine control device |
| US8495995B2 (en) * | 2010-06-23 | 2013-07-30 | Briggs And Stratton Corporation | Automatic choke for an engine |
| CN105626285B (en) * | 2016-01-29 | 2019-01-25 | 深圳市力骏泰燃气动力科技有限公司 | A kind of engine mixed gas intelligent regulating system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57182241U (en) * | 1981-05-15 | 1982-11-18 | ||
| US5378411A (en) * | 1993-10-08 | 1995-01-03 | Nippon Thermostat Co., Ltd. | Automatic choke system for carburetor |
| US5537964A (en) * | 1993-09-08 | 1996-07-23 | Sanshin Kogyo Kabushiko Kaisha | Engine choke actuation system |
| CN1313462A (en) * | 2000-03-15 | 2001-09-19 | 本田技研工业株式会社 | Automatic choke valve controlling device |
| JP2001323843A (en) * | 2000-05-15 | 2001-11-22 | Tk Carburettor Co Ltd | Starting fuel supply device for engine |
| CN2929215Y (en) * | 2004-07-26 | 2007-08-01 | 本田技研工业株式会社 | Automatic choke system for carburetor |
-
2004
- 2004-07-26 JP JP2004216996A patent/JP4145844B2/en not_active Expired - Fee Related
-
2005
- 2005-07-25 CN CN 200520114394 patent/CN2929215Y/en not_active Expired - Fee Related
- 2005-07-25 CN CNB2005100855585A patent/CN100465424C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57182241U (en) * | 1981-05-15 | 1982-11-18 | ||
| US5537964A (en) * | 1993-09-08 | 1996-07-23 | Sanshin Kogyo Kabushiko Kaisha | Engine choke actuation system |
| US5378411A (en) * | 1993-10-08 | 1995-01-03 | Nippon Thermostat Co., Ltd. | Automatic choke system for carburetor |
| CN1313462A (en) * | 2000-03-15 | 2001-09-19 | 本田技研工业株式会社 | Automatic choke valve controlling device |
| JP2001323843A (en) * | 2000-05-15 | 2001-11-22 | Tk Carburettor Co Ltd | Starting fuel supply device for engine |
| CN2929215Y (en) * | 2004-07-26 | 2007-08-01 | 本田技研工业株式会社 | Automatic choke system for carburetor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1727661A (en) | 2006-02-01 |
| JP4145844B2 (en) | 2008-09-03 |
| JP2006037803A (en) | 2006-02-09 |
| CN2929215Y (en) | 2007-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1621754B1 (en) | Automatic choke system for carburetor | |
| CN100465424C (en) | Automatic choke system for carburetor | |
| US7246794B2 (en) | Carburetor throttle valve control system | |
| JPS6114333B2 (en) | ||
| US8365620B2 (en) | Rack and pinion gear | |
| CN102828854B (en) | Simple starting carburetor | |
| CN102828853B (en) | Linkage mechanism of carburetor | |
| WO2003008786A1 (en) | Fuel injection rate control device | |
| CN102840053A (en) | Paraffin temperature controller for carburetor | |
| JP4970297B2 (en) | Vaporizer control device | |
| JP4970298B2 (en) | Vaporizer control device | |
| CN111794847A (en) | Electric heating type thermostat for internal combustion engine | |
| JP4199171B2 (en) | Vaporizer auto choke device | |
| US20010025623A1 (en) | Hot water type first idle control device | |
| CN213063740U (en) | Electric heating type thermostat for internal combustion engine | |
| CN203009081U (en) | Linkage mechanism of carbureter | |
| JP4252943B2 (en) | Vaporizer auto choke device | |
| JP4145845B2 (en) | Vaporizer auto choke device | |
| JPH0814018A (en) | Valve actuator and engine using it | |
| JP4145847B2 (en) | Vaporizer auto choke device | |
| JPS6228660Y2 (en) | ||
| JP4145846B2 (en) | Vaporizer auto choke device | |
| JPH037547Y2 (en) | ||
| JPH0466732A (en) | Fuel injection timing regulating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090304 |