KR790001696B1 - Carburetor - Google Patents

Abstract

A carburetor assembly has a primary passage(12) abapted to supply a lean mixture to main combustion chamber of an engine, an auxiliart passage(14) adarted to supply a rich mixt, to auxiliary combustion chamber of the engine, each of the passages having throttle valve (18)(22) mounted shafs(19) (23) for turning movement, including ahollow hub(24) encircling a portion of one of shafts, a menber mounted to turn on the hub, for coord- inating turning movements of shafts (19).

Description

Carburetor

1 is a side elevational view of a portion of an embodiment of the present invention.

2 is a cross-sectional view taken along the line 2-2 of FIG.

3 is a bottom view showing a part of the apparatus of the present invention.

4 is a partial plan view of the apparatus.

5 is a side view showing the primary throttle valve in the closed position.

6 is a side view showing the primary throttle valve in the open position.

7 and 9 are side views showing the state of follower connection between the primary draw valve and the secondary throttle valve.

10 is a plan view of a modification thereof.

11 is a side view of the device shown in FIG.

12 is a plan view of a portion of FIG.

13 is a cross-sectional view taken along line 13-13 of FIG.

14 is a side view of a second modification.

15 is a cross-sectional view taken along line 15-15 of FIG.

First, the outline of the present invention describes that the assembly of the carburetor has primary and secondary venturi passages for supplying the lean mixer to the main combustion chamber of the engine and to provide rich mixed air to the subcombustion chamber of the engine. (V) has a venturi passage. The throttle valve in each passage has a shaft, the primary throttle valve shaft protruding by inserting a hollow hub on the vaporizing body.

Several members and springs are mounted on the hub to act to control the rotational movement of all throttles during the various operating conditions of the engine. The link is attached to an arm that pivots with the primary throttle valve at one end thereof. And an angle adjustment is attached to the arm that rotates with the soft throttle valve. And the adjustment of the angle is installed between the throttle valve and its arm, and the geometric relationship of the link and the arm is to provide a corresponding movement between the throttle valve.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Next, the present invention relates to an internal combustion spark ignition piston engine in which each cylinder has a main combustion chamber and a subcombustion chamber in communication with the torch nozzle. This type of engine describes the reduction of NOx, HC and CO in the exhaust gas of the internal combustion engine of Dade et al. Application No. 353,786, filed April 23, 1973.

More specifically, the present invention relates to a vaporizer assembly for supplying lean mixed air to the main combustion chamber and rich mixed air to the subcombustion chamber, in order to avoid the generation of unnecessary contaminants in the exhaust gas of the engine. It is important that the air fuel ratio of the mixed air is maintained at a narrow limit with respect to the operating conditions of the entire engine.

In this way, it is important to minimize the generation of contaminants during cranking, fasting, idling, slow idling, acceleration gear shifting, highway operation, slow acceleration and rapid acceleration.

According to the present invention, the primary throttle valve shaft, which is one side of the throttle valve, protrudes through a hollow hub fixed integrally on the vaporizing body. The operator member has a tightening cable attached to rotate the top of the hub against the action of the spring connected to the operator member and the connector member fixed to the protruding end of the shaft connects the operator member to the shaft. In this way, the tension of the clamping cable is resisted by the fixed hollow hub and the tension does not cause the bending of the shaft. Other members affecting or modifying the rotational motion of the throttles are mounted on the hollow hubs and the lateral forces they generate are also absorbed by the hub, not the throttles. These characteristics help to ensure the smooth opening and closing of the throttle valve. And a new type of connection is established between the primary throttle valve controlling the lean mixed air and the soft throttle valve controlling the rich mixed air. The connection is achieved without using a cam and the angle of the primary throttle valve Position the throttle valve extremely accurately.

The connection uses a link fixed to an arm extending forward in one axial shaft, and a link fixed to an arm extending rearward in the other axial shaft, with a control to change the angular position of the arm with respect to the axial shaft. . In this way, the linking and regulating device of the link ensures to supply the appropriate amount of rich mixed air to the subcombustion chamber of the engine with respect to the lean fuel mixed air supplied to the main combustion chamber of the engine under any operating condition of the engine. And a new mechanism is used to close the secondary throttle valve when the primary throttle valve is moved to the position where the primary throttle valve is closed to cause the valve to open after the primary throttle valve is opened by a predetermined amount. Used with).

The vacuum actuator is used to position the throttle valve between any operating condition of the engine. It is used to prevent the throttle valve with an additional device from closing too fast and to ensure that the throttle valve closes quickly when the electrical ignition system becomes inoperative.

And other detailed objects and advantages will be apparent from below. In the figure, reference numeral 10 denotes a carburetor, and the assembly of the carburetor is a metal body 11 having a primary passage 12, a wall for forming a secondary passage 13, and a secondary passage 14. The passages of are parallel and also have Venturi necks 15, 16 and 17, respectively. The fuel jet introduced from the float chamber in the main body 11 creates lean mixed air in the passages 12 and 13 so as to be supplied to the main combustion chamber of the engine, and at the same time, the passage 14 to supply the subcombustion chamber of the engine. Make rich mixed air in).

The passages 12, 13, 14 each have a throttle valve supported on an axis that rotates with respect to the vaporizing base 11. In this way, the primary throttle valve 18 is fixed to the shaft 19, the secondary throttle valve 20 is fixed to the shaft 21, and the subthrottle valve 22 is fixed to the shaft 23. And the axes 19, 21, 23 are parallel. As shown in FIG. 2, the cylindrical part is formed in the wall of the vaporizing base body 11, and the hollow hub 24 surrounding the part of the throttle valve shaft 19 is formed so that it protrudes out here. The operator member indicated by reference numeral 25 is attached to be rotated on the fixed hub 24 and the member 25 is two metal inserts fixed to each other with pins 28 so that they can be rotated as unitary units integrated into a single body. It consists of (26) (27). The single member 25 is acted by a torsion spring 29 surrounding the hub 24 with one end coupled to the stop pin 30 and the other end coupled to the member 25, the torsion spring 29 Acts in the clockwise direction on the single member 25 as in the first degree, as opposed to the opening movement of the primary throttle valve 18. The component 26 of the single member 25 has a fin 33 extending in the axial direction, which has a portion to be received in the slot 34 on the connecting member 35. The connecting member 35 is fixed to the protruding end of the shaft 19 with a nut 36. In this description, the single member is installed in the fixed hollow hub 24, but it can be seen that it is connected to rotate with the throttle valve (19).

The component 27 of the single member 25 has a socket 37 which receives the terminal chain fitting 38 at the end of the tightening cable 39. The cable 39 passes through the receiving tube 40 fixed to the fixing bracket 41 by the locking nut 42. The tension given to the clamping cable 39 acts while rotating clockwise in FIG. 1 with respect to the action of the torsion spring 29 in the single member 25. The rotational movement of the member 25 causes the connecting member 35 to rotate the throttle 19 in the direction in which the primary throttle valve 18 in the passage 12 opens. The position at which the throttle valve 18 is closed is determined by the setting of the adjustment screw 43 coupled with the stop 44 installed in the part 27, and the movement of opening the throttle valve 18 is fixed by the stop 45. It is limited by the contact of the stop pin 30. Since the operator member 25 is coupled to the fixed hub 24 instead of the shaft 19, the linear force given to the socket 37 by the tightening cable 39 does not generate a bending load on the shaft 19. The rotational force of the member 25 is transmitted to the throttle 19 through the connecting member 35, and two other members are installed to rotate on the hollow hub 24. The determinant 47, which determines the tightening position, on the other hand, has an arm 48 fixed to the rod 49 of the operator extending from the vacuum actuated diaphragm assembly 50. The other arm of the tightening positioner 47 has a rounded portion 51 that engages the side of the fin 33. The slot 52 is equipped for initial factory adjustment of the rounded part 51 with respect to the fin 33 by inserting a deformation tool in the slot.

Another member installed to be rotated on the hollow hub 24 is represented by 53, which is a first arm 54 secured by 55 to an operator rod 56 extending from the diaphragm assembly 57. ) The rounded portion 58 on the arm 54 is in contact with the shoulder 59 of the component 27 of the single member 25. Slot 60 provides a device for factory adjustment located in rounded portion 58. The part 27 of the single member 25 has an outer circumferential cam surface 62 that cooperates with the follower 63 on the member 64.

The member 64 rotates with the shaft 21 for the secondary throttle valve 20. The shaft 21 protrudes through the hollow fixing hub 65, and the protruding end thereof is fixed to the member 64. The other member 65 is coupled to pivot on the stationary hub 65, which installs a radial projection 67 which is coupled to one end 68 of the torsion spring 69. The other end 70 of the torsion spring is coupled to the fixing protrusion 71 on the carburetor body 11. It will be appreciated that in this description the torsion spring 69 acts to rotate the member 66 clockwise in FIG. The protrusion 67 of the member 66 imparts a force in the opposite direction to the opening movement of the secondary throttle valve 20 to the end 72 of the member 64. The roller 72a installed in the single member 25 is coupled to the cam face 73 of the member 66 after passing through a predetermined circular stroke in the direction in which the primary throttle 19 is opened.

When the single member 25 continues to rotate in the open direction, the roller 72α moves the member 66 counterclockwise against the action of the torsion spring 69. Prior to engagement with the cam surface 73 of the roller 72a, the cam surface 62 is moved to a position where the member 64 can rotate counterclockwise with respect to the roller 63. The rotational movement of the secondary throttle 21 is achieved by the vacuum actuated diaphragm assembly 75 acting through the rod 76 and the fixing portion 77 of the member 64. A device is installed to replace the motion of the primary throttle valve 18 and the sub throttle 22. In order to minimize unnecessary contaminants in the engine exhaust gas, it is essential that these two throttle valves are accurately controlled during the operating conditions of the entire engine. The link 78 is secured with 79 to the forwardly extending arm 80 supported by the operator member 25. This link 78 is secured with 81 to an arm 82 extending rearward of the member 83 that rotates around the axis of the throttle 23.

The other member 84 fixed to the throttle 23 is adjustablely connected to the member 83 by the adjustment screw 85.

The adjusting screw 85 controls the position of the relative angles of the members 83 and 84, and in this way controls the position of the pivot 81 relative to the sub throttle valve 22. Torsion springs 86 extend between pivots 79 and 81 to prevent rocking. The throttle valves 18 and 22 are marked in the closed position as shown in FIG. 5 and in the open position in FIG. In order to obtain the required angular motion of the primary throttle valve 18 of the boot throttle 22, the effective length "a" of the short arm 80 as the sixth degree is set to the effective length "b" of the long arm 82. It should be about 3/4. And the following relationship must exist.

(a + c) /d=0.9 to 1.2

Where a = effective length of short arm (80)

c = effective length of link 78

d = distance of the centerline of the bridges 19 and 23

7,8 and 9 are graphs showing how the primary throttle valve 18 moves with respect to the secondary throttle valve 20. In FIG. 7, both throttle valves 18 and 20 are closed. When the simple locking stop 38 of the tightening cable 39 acts on the socket 37 to rotate the primary throttle valve 18 by about 40 degrees, the cam roller 72a, as shown in the eighth degree, has the Since the cam face 73 is properly reached, the secondary throttle valve 20 is in a closed state.

According to the continuous rotational movement of the primary throttle valve 18, the roller 72a of the cam face 73 rotates the member 66 counterclockwise with respect to the torsion spring 69.

This causes the protrusion 67 to move in a direction that separates the member 64, so that the diaphragm assembly 75 can rotate the throttle 21 counterclockwise by heat of the secondary throttle valve 20. In FIG. 9 both throttle valves 18 and 20 are shown in the open position. Like the second diagram, the crank arm 87 may be secured to the protruding end of the shaft 19 for connection to a conventional acceleration pump (not shown).

Initial cranking of the engine in operation may require the use of the choke device 88. Between the initial crankings, the primary throttle valve 18 and the subthrottle valve 22 are in the fast idle position, and the secondary throttle valve 20 is closed. The engine is started to rotate by its own force, and when the cranking is broken, the accelerator pedal (not shown) causes the tightening control cable 39 to rotate clockwise when the operator member 25 is seen in FIG. It works to move.

This causes the opening movement of the primary throttle valve 18 and the opening movement of the soft throttle valve 22.

The original movement of the operator member 25 is resisted by the torsion spring 29, and after the member 25 has rotated several times, the rod 56 reaches the bottom in the device 57 and the member ( 54) prevent further rotation. Further rotational movement by the actuating member 25 is resisted by the torsional springs 29 and 32. When the primary throttle valve is opened about 40 degrees, the cam face 62 moves to allow the roller 63 to rotate about the axis of the secondary throttle valve 21.

A large amount of air flow through the primary passage 12 generates a significant pressure drop in the venturi neck portion 15.

A passage (not shown) also communicates the low pressure portion in the venturi 15 with the vacuum actuated diaphragm assembly 75. The opening motion of the primary throttle valve 18 by the tightening control cable 39 leads to an increase in the engine speed and consequently an increase in the amount of air introduced through the venturi neck 15. This creates a greater pressure drop in the venturi neck, thereby causing the vacuum actuated diaphragm assembly 75 to pull the rod 76 to open the secondary throttle valve 20. This supplies additional lean mixed air to the engine's main combustion chamber. At the same time, the linkages 78, 80 and 82 increase the opening of the soft throttle valve 22 again to increase the supply of the rich mixed air in the combustion chamber of the engine.

The control valve (not shown) connects the vacuum actuated diaphragm assembly 50 under the suction of the manifold only when the suction negative pressure reaches a predetermined size, for example 530 mmHg.

When the driver of the car wants to decelerate, the return springs 29 and 32 allow the primary throttle valve 18 to return counterclockwise in FIG. 1 when the driver releases the foot from the accelerator pedal. Torsion springs 69 are tightly controlled to close the secondary throttle valve 20. However, the secondary throttle valve 20 tends to open only when the primary throttle valve 18 is moving to the closed position.

This is because the vacuum strength in the apparatus 75 does not decrease quickly enough to correspond to the change in suction pressure in the primary venturi neck 15. This difficulty is overcome by the action of the cam face 62 and the follower 63. That is, the action causes the secondary throttle valve 20 to close when the primary throttle valve 18 is closed.

Subsequently, it gradually decelerates to generate the closing motion of the primary and secondary throttle valves, and the closing movement of the soft throttle valve 22 corresponds to the closing movement of the primary throttle valve 18. If the driver of a car rushes his foot off the accelerator, a sudden deceleration of the engine occurs. This is because the primary throttle valve 18 and the subthrottle valve 22 move toward the idling position, while the secondary throttle valve 20 moves toward the closed position.

The positioner assembly 50 acts to ensure that the throttle valve is opened at an angle greater than the idling position while the passenger car is decelerated above a predetermined speed to minimize the formation of bad emissions during engine exhaust. The diaphragm assembly 57 first acts as a dash pot that restricts closing the primary and soft throttle valves too quickly, which would interfere with proper operation of the engine. When the driver of the car disengages from the accelerator pedal to shift or decelerate, it is advisable to approach the closed position of the primary throttle valve 18 to reduce the shielding rate. This necessitates overcoming the function of the positioner assembly 50 which does not respond rapidly when the throttle valve 18 approaches toward a position to close rapidly. When less than about 12 miles / hour, a speed detection switch (not shown) shuts off the supply of the vacuum assembly 50 and allows the idle position of the primary throttle valve 18 to close. The device 57 also acts as a run on preventer as the interior of the chamber is in communication with the atmosphere when the electricity of the electrical ignition circuit is released.

In the modification of the present invention shown in FIGS. 10 to 13, the vaporizer assembly 100 is used to supply lean mixed air to the main combustion chamber of the engine, respectively, and the second vaporizer assembly 101 is supplied to the subcombustion chamber of the engine. It is installed to supply rich mixed air.

The first vaporizer assembly 100 uses a tightening operator bar 102 to operate the throttle valve of the conventional assembly 100 in a conventional fashion. The tightening bar 102 is fixed to the crank member 104 fixed to the intermediate shaft 105 by 103. Tension spring 106 is connected to crankshaft 104 to rotate shaft 105 counterclockwise in FIG. The subthrottle 107 is fixed to the throttle 108 installed to rotate in the main body 109 of the vaporizer 101.

The cam member 11 is fixed to the disk 111 fixed to the shaft 105 and the cam 110 has a cam surface 112 that is coupled to the follower 113 on the crank arm 114. The crank 115 connected to the throttle 108 is adjustablely connected to the crank arm 114 by the adjustment screw 116. In this description, it is understood that the rotational motion of the intermediate shaft 105 is generated in the rotational motion of the throttle valve 107 through the cam 110, the follower roller 113, the adjustment screw 116 and the member 115. Can be.

The intermediate shaft 105 is supported in the shaft 118 fixed to the fixing bracket 119. The shaft 105 is supported in the fixed hollow hub 120 fixed to the fixing bracket 121. The operator member 122 is installed to rotate at the hub 120 and has a socket 123 for receiving the end clamp 124 of the tightening cable 125. Tension spring 126 is connected to operator member 122 to resist clockwise movement in FIG. The hook portion 132 formed in the member 104 protrudes over the operator member 122, and thus, by the force exerted by the tightening cable 125, and with respect to the operation of the spring 126. The member 104 rotates such that the rotational movement of 122 rotates the intermediate shaft 105. The diaphragm assembly 127 acts via the rod 128 and the shaft 129 to the member 130 coupled to rotate on the hollow fixing hub 120. The hanging portion 131 fixed to the disk 111 overlaps at one part of the member 130 and thus the tension of the rod 128 acts to rotate the shaft 105 clockwise in FIG. 10.

The device can be described as a dash port to prevent the throttle valve from closing too soon.

The vacuum actuated diaphragm assembly 133 acts via the rod 134 and the shaft 135 to rotate the member 136 installed to rotate on the fixed shaft 118. The other member 137 fixed to the protruding end of the shaft 105 has the result of overlapping over a portion of the member 136 so that the tension of the rod 134 acts to cause the shaft 105 to rotate. The device can be described as a fastener determiner.

The shaft 105 connected to rotate the throttle valve 108 is operated on the tightening cable 125 through a member installed to rotate on the fixed hub 120 and the shaft 105 protrudes through the hub 120. It can be seen that the bending load generated by the tension of the cable is taken not by the shaft 105 but by the fixed hub 120.

And it can be seen that the rotational movement of the throttle valve shaft 108 is affected by the action of the diaphragm assembly 127 and the vacuum operating device 133 is applied to the action of the tightening cable 125.

In another variant of the invention shown in FIGS. 14 and 15, a normal vaporizer 100 is used as described above and its throttle valve is actuated by a tightening operator bar 102.

However, there is no intermediate shaft corresponding to the shaft 105, and instead, the soft throttle valve 104 is directly connected through the member 141 to the members 142 and 143 installed to rotate on the fixed hollow hub 144.

The hub 144 is provided so that the throttle valve 147 formed in one body with the main body 145 of the incubator assembly 146 is installed in the passage 148 and controls the supply of the rich mixed air to the engine combustion chamber. Works.

The tightening cable 150 is imported into the socket 152 installed in the member 142 and has a locking fixture 151 at its end. The tension of the tightening cable 150 acts to rotate the member 142 clockwise in FIG. 14 with respect to the action of the tension spring 153. The torsion spring 154 surrounding the hub 144 is opposed to the rotational movement of the member 143 by the force used by the connection 155 of the tightening positioner or the connection 156 of the dashpot.

The adjustment screw 157 provides a device for changing the position of the throttle valve 147 relative to the member 142.

The tightening positioner rod 158 and the dashpot rod 159 each have a final actuating connection 160, 161.

This is necessary to allow the throttle valve 14 to be opened beyond a position that does not interfere with each of the short stroke rods 158 and 159. The operation of variants of the invention, such as 10 to 13, 14 and 15 degrees, will be apparent from the description of the preferred embodiment described above.

Examples of the embodiment of the present invention are as follows.

[State 1]

Combination of claims in which the elastic device is a torsion spring surrounding the hub.

[State 2]

A combination of claims in which the primary and secondary passages are all disposed within the carburetor body, wherein the hollow anchoring hub protrudes from the body.

[State 3]

A combination of claims based on a primary passage formed in one main body and a secondary passage formed in another main body isolated from the main passage.

[State 4]

A combination of claims described above, wherein the latter device comprises a device for adjusting the angular position with respect to the primary throttle valve of the soft throttle valve.

[State 5]

The scope of the appended claims includes a device for adjusting the angular position with respect to each axis of the arm and a link anchored to each of the arms connected so that the latter device rotates with each of the axes described above. Combination.

[State 6]

A carburetor assembly for use in an internal combustion engine having at least one main combustion chamber and a subcombustion chamber connected to it by a torch nozzle, the carburetor assembly comprising: a main body having a primary passage, a secondary passage, and a secondary passage therein; And the secondary passages are adapted to supply the lean mixer to the main combustion chamber of the engine, and the sub-channels are coupled to supply the rich mixed gas to the subcombustion chamber of the engine, each of the passages having an internal throttle fixed on the shaft. A device having a valve, the device being attached on the body to rotate the shaft, the device including a hollow stationary hub that protrudes from the body and surrounds a portion of one of the shaft, and is coupled to rotate on the hub A device for applying a linear force to the member so that the member is rotated in one direction, an elastic device connected to rotate the member to the other, and a rotation of the shaft The carburetor assembly to the shaft end having the combination to the device for associating the device and on its axis, rotation protrusion on the hub to connect the members.

[State 7]

The combination according to State 6, wherein the elastic device is a torsion spring surrounding the hub.

[State 8]

The combination according to state 6, wherein the vacuum actuator is provided to rotate the secondary throttle, and the cam and the follower mechanism operate to allow movement of the secondary throttle by the vacuum actuator.

Claims (1)

A vaporizer assembly for use in an internal combustion engine having at least one main combustion chamber and a combustion chamber connected to it by a torch nozzle, the vaporizer assembly comprising: a primary passage suitable for supplying lean mixed air to the main combustion chamber of the engine and the subcombustion chamber of the engine And a thorough passage suitable for supplying rich mixed air to each of the passages, each of which has a throttle valve supported on the shaft, and a device for attaching to rotate the shaft, the apparatus being hollow fixed around one side of the shaft. A member comprising a hub and coupled to rotate on the hub, a device for applying a linear force to rotate the member in one direction, an elastic device connected to pivot the member in the other direction, and for rotating the shaft Connecting the members and corresponding to the rotational movement of the shaft with one end of the shaft protruding from the hub Combining a device carburetor assembly.

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