JP4126431B2 - Sliding throttle valve type vaporizer - Google Patents

Description

[0001]
[Industrial application fields]
The present invention is a carburetor for adjusting and controlling the amount and concentration of an air-fuel mixture supplied to an engine, and an intake passage penetrating the carburetor body is arranged in a sliding throttle valve guide cylinder and moves in a linear direction. A sliding throttle valve type carburetor that is opened and closed by a sliding throttle valve, and further includes a sliding opening sensor that outputs a linear voltage corresponding to the opening of the sliding throttle valve (the position of the sliding throttle valve). The present invention relates to a dynamic throttle valve type carburetor.
[0002]
[Prior art]
A sliding throttle valve type carburetor having such an opening degree sensor is used for an ignition timing control device or the like in which the ignition timing is controlled with an ignition timing characteristic set in advance according to the opening degree of the sliding throttle valve, for example.
Here, in the sliding throttle valve type carburetor, the sliding throttle valve is moved in a linear direction by an accelerator wire operated by the driver to open and close the intake passage, while the opening sensor is A change amount of the rotation angle is detected and a voltage corresponding to the change amount is output.
According to the above, it is necessary to convert linear movement of the sliding throttle valve into rotational movement once and detect this rotational angle. In order to detect this rotation, a new dedicated sensor for the opening sensor is required. It is necessary to prepare a rotating lever.
[Problems to be solved by the invention]
[0003]
As described above, according to the provision of the dedicated rotation lever for the opening sensor, it is necessary to secure a space for installation in the carburetor body and to prepare a new dedicated component. This is not preferable because the degree of freedom in design layout is hindered and the manufacturing cost is increased.
[0004]
The sliding throttle valve type carburetor according to the present invention is made in view of the above problems, and does not provide a new part dedicated to an opening sensor, and has a high degree of design freedom and an inexpensive opening. An object of the present invention is to provide a sliding throttle valve type carburetor having a sensor.
[0005]
[Means for achieving the object]
Sliding throttle valve type carburetor according to the present invention in order to achieve the above objects, locked to one end of the throttle cable, the sliding throttle valve for opening and closing the intake path through the carburetor body by the operation of the accelerator wire A sliding throttle valve type carburetor comprising: an acceleration pump device that increases and decreases the volume of the pump chamber by linear movement of the pump rod and injects the accelerated fuel in the pump chamber toward the intake passage;
The acceleration operation lever that is rotatably supported by the first shaft that protrudes laterally integrally with the carburetor body is engaged with the acceleration wire that is operated synchronously with the accelerator wire by the driver. An accelerating wire guide lever portion, a cam portion having a cam surface in the rotation direction, and an engagement projection portion in the shape of a truncated circle that is formed concentrically with the rotation center of the acceleration operation lever and protrudes to the side ;
A pump pressing lever supported rotatably on a second shaft that protrudes laterally integrally with the carburetor body includes a locking portion that abuts against the cam surface of the acceleration operation lever, and a pump A pressing portion that comes into contact with the rod,
An engagement hole formed in the rotor of the opening sensor attached to the carburetor body is engaged with the engagement protrusion of the acceleration operation lever, and the rotor and the acceleration operation lever are rotated synchronously. It is characterized by that.
[00 06 ]
[Action]
The acceleration wire and accelerator wire are operated synchronously by the driver. The opening of the sliding throttle valve is determined by the amount of movement of the accelerator wire, and the rotation angle of the acceleration lever is determined by the amount of movement of the acceleration wire. Is done.
At this time, the accelerator wire and the acceleration wire are operated synchronously, whereby the rotation angle of the acceleration operation lever is determined according to the opening of the sliding throttle valve.
The rotor of the opening sensor detects the rotation angle of the acceleration operation lever, whereby the opening sensor can output a voltage corresponding to the opening of the sliding throttle valve.
On the other hand, the rotation of the acceleration operation lever rotates the pump pressing lever from the cam surface of the cam portion via the locking portion. According to this, the pressing portion moves the pump rod, and the desired acceleration is achieved from the pump chamber. Fuel can be injected into the intake passage.
Also, since the first and second shafts are formed integrally with the carburetor body, it is easy to form the support shaft, and the outer periphery of the first shaft and the second shaft is rotatable by the acceleration operation lever and the pump pressing lever. Therefore, the rotation bearing portions of the respective levers can be made long, and the tilting of the respective levers can be suppressed, and favorable rotation can be obtained.
[00 07 ]
【Example】
An embodiment of a sliding throttle valve type carburetor according to the present invention will be described below with reference to the drawings.
FIG. 1 is a side view of a sliding throttle valve type vaporizer, and FIG. 2 is a schematic sectional view for explaining the operation of the sliding throttle valve type vaporizer.
Reference numeral 1 denotes a carburetor main body through which an intake passage 2 passes, and a sliding throttle valve guide tube 3 is continuously provided outward from a substantially middle portion of the intake passage 2. The sliding throttle valve 4 is movably disposed.
One end of an accelerator wire W operated by a driver is locked to the sliding throttle valve, and the other end of the accelerator wire W is locked to an accelerator grip (not shown).
Thus, when the driver operates the accelerator grip, the sliding throttle valve 4 can move in the sliding throttle valve guide cylinder 3 in the linear direction to open and close the intake passage 2.
Reference numeral 5 denotes a floating chamber main body having a bottomed cup shape disposed below the vaporizer main body 1. The floating chamber 6 is formed by the vaporizer main body 1 and the floating chamber main body 5. A constant fuel liquid level XX is formed by the cooperative action of a float and a valve seat (not shown).
[00 08 ]
Next, the acceleration pump device P will be described.
Reference numeral 7 denotes a diaphragm that separates the pump chamber 8 and the atmospheric chamber 9. The pump chamber 8 is connected to the float chamber 6 on the upstream side of the pump chamber 8, and includes a suction check valve (not shown) inside. A flow path 10 and a pump discharge side flow path 11 having a discharge side check valve (not shown) therein are opened, the flow path 10 being connected to the intake path 2 on the downstream side.
The diaphragm 7 is in contact with the lower end 12A of the pump rod 12, and the upper end 12B of the diaphragm 7 projects upward from the upper end of the guide tube portion 13 that guides the pump rod 12.
Note that S is a pump spring that is contracted in the pump chamber 8.
[00 09 ]
Next, the operation part which operates the said acceleration pump apparatus is demonstrated.
Reference numeral 14 denotes a first shaft formed to protrude from the carburetor body 1 to the side, and an acceleration operation lever 20 is rotatably supported on the first shaft 14.
The acceleration operation lever 20 is formed as follows.
Reference numeral 21 denotes a bearing portion that is rotatably inserted and arranged on the outer periphery of the first shaft 14. An acceleration wire guide lever portion 22 is formed at the right end of the bearing portion 21. An end hole 22A for locking the acceleration wire end 23 disposed at one end and a guide groove portion 22B for guiding the acceleration wire A in the rotation direction are provided.
A cam portion 24 having a cam surface 24A in the rotational direction is formed at the left end of the bearing portion 21, and an engagement protrusion having a notch shape (for example, a D-cut shape) is formed on the right end surface of the acceleration wire guide lever portion 22. A portion 25 is formed to protrude.
The engaging protrusion 25 is formed concentrically with the center of rotation of the acceleration lever 20.
The acceleration lever 20 is applied with a rotational force in the clockwise direction in FIG. 1 by an acceleration lever spring 26. One end of the acceleration lever spring 26 is locked to the carburetor body 1, and the other end is an acceleration operation lever. 20 is locked.
In addition, the acceleration wire is an object in which an accelerator wire W and an upper portion (not shown) are integrated and locked to an accelerator grip (not shown). When the accelerator grip is rotated in one direction, the acceleration wire slides. The throttle valve 4 is moved upward to open the intake passage 2, while the acceleration operating lever 20 rotates counterclockwise in FIG.
Further, when the accelerator grip is rotated in the other direction, the sliding throttle valve 4 is moved downward to close the intake passage 2, while the acceleration lever 20 is clockwise in FIG. 1 by the spring force of the acceleration lever spring 26. Rotate to.
That is, the sliding throttle valve 4 and the acceleration operation lever 20 move synchronously according to the operation of the accelerator grip.
In other words, the acceleration operation lever 20 is in the most clockwise position with the sliding throttle valve 4 closing the intake passage 2, and the acceleration operation is performed with the sliding throttle valve 4 fully opened. The lever 20 is at a position rotated most counterclockwise.
[00 10 ]
Reference numeral 15 denotes a second shaft formed to protrude from the carburetor body 1 to the side, and the pump pressing lever 30 is rotatably supported on the second shaft 15.
The pump pressing lever 30 is formed by the following.
Reference numeral 31 denotes a bearing portion that is rotatably inserted on the outer periphery of the second shaft 15, and a locking portion 32 is provided on the outer peripheral portion of the bearing portion 31.
The locking portion 32 is formed by a locking rod 32A disposed facing the cam surface 24A of the acceleration operation lever 20, and a locking spring 32B that presses the locking rod 32A toward the cam surface 24A. According to this, the tip of the locking rod 32A is always pressed and arranged on the cam surface 24A of the acceleration operating lever 20 by the spring force of the locking spring 32B.
Further, a pressing portion 33 is provided on the outer peripheral portion of the bearing portion 31, and the pressing portion 33 is disposed so as to abut on the upper end 12 </ b> B of the pump rod 12 described above.
[00 11 ]
According to the above, when the acceleration operation lever 20 rotates counterclockwise in FIG. 1, the cam surface 24 </ b> A greatly presses the locking rod 32 </ b> A to rotate the pump pressing lever 30 counterclockwise, and the pressing portion 33 counterclockwise. The pump rod 12 is pressed downward in FIG. 1 by the rotation of the direction, and the diaphragm 7 compresses the pump chamber 8 against the spring force of the pump spring S to reduce the chamber volume of the pump chamber 8.
On the other hand, when the acceleration lever 20 rotates clockwise from the counterclockwise rotation state, the pressure on the locking rod 32A by the cam surface 24A is reduced, the pump pressing lever 30 rotates clockwise, and the timepiece of the pressing portion 33 rotates. The pump rod 12 moves upward in FIG. 1 by the rotation in the direction, and the diaphragm 7 increases the chamber volume of the pump chamber 8 by the spring force of the pump spring S. Reference numeral 40 denotes a locking piece screwed onto the right end surface of the second shaft 15, and includes an acceleration operation lever 20 supported on the first shaft 14 and a pump pressing lever 30 supported on the second shaft 15. Escape from the respective shafts 14 and 15 to the right is suppressed.
[00 12 ]
The opening degree sensor K is screwed to the carburetor main body 1 by a screw 41, and the engagement hole 43 of the rotor 42 protruding outward from the opening degree sensor K is an engagement protrusion of the acceleration operation lever 20. Engage with the portion 25.
[00 13 ]
Next, the operation will be described.
In a state where the accelerator grip is not operated by the driver (in an idling operation state of the engine), the sliding throttle valve 4 is in the position where the intake passage 2 is most closed, and at this time, the acceleration operation lever 20 is in the position rotated most clockwise. is there.
According to the above, the sliding throttle valve 4 maintains the idling opening degree, while the acceleration operation lever 20 is in the most clockwise position, and the position of the acceleration operation lever 20 is determined by the rotor via the engagement protrusion 25. 42, the opening degree sensor K can output a voltage corresponding to the idling opening degree of the sliding throttle valve 4.
On the other hand, in such a state, the locking rod 32A of the pump pressing lever 30 is disposed in contact with the lowest position of the cam surface 24A of the acceleration operating lever 20, so that the pressing portion 33 is at the position rotated most clockwise, The diaphragm 7 is held at the upper position without greatly pressing the pump rod 12, and acceleration fuel is stored and held in the pump chamber 8.
[00 14 ]
Next, when the accelerator grip is opened by the driver, the accelerator wire W and the acceleration wire A are simultaneously pulled upward. According to this, the sliding throttle valve 4 opens the intake passage 2 and the acceleration operation lever. 20 rotates counterclockwise against the spring force of the acceleration lever spring 26.
Then, the counterclockwise rotation of the acceleration operation lever 20 is transmitted to the rotor 42 via the engaging projection 25, and the opening sensor K is a voltage corresponding to the counterclockwise rotation angle of the acceleration operation lever 20. Can be output.
And since the accelerator wire W and the acceleration wire A move simultaneously and synchronously in the above, the opening degree sensor K can output the voltage according to the opening degree of the sliding throttle valve 4.
On the other hand, when the acceleration operation lever 20 is rotated counterclockwise by the opening operation of the sliding throttle valve 4, the locking rod 32A comes into contact with the high position of the cam surface 24A, and the pump including the pressing portion 33 is included. The pressing lever 30 rotates counterclockwise.
When the pressing portion 33 rotates counterclockwise, the pump rod 12 moves the diaphragm 7 downward against the spring force of the pump spring S to reduce the chamber volume of the pump chamber 8, and into the pump chamber 8. The stored acceleration fuel can be injected into the intake passage 2 via the pump discharge side flow path 11.
[00 15 ]
According to the above, when the accelerator wire W and the acceleration wire A are operated simultaneously and synchronously, the rotation angle of the acceleration operation lever 20 is determined according to the opening degree of the sliding throttle valve 4 with respect to the intake passage 2. The voltage output from the opening sensor according to the rotation angle of the acceleration operation lever 20 can be said to be a voltage signal corresponding to the opening of the sliding throttle valve.
Therefore, according to the sliding throttle valve type carburetor according to the present invention, it is necessary to prepare a new dedicated rotating lever for converting the moving direction of the sliding throttle valve moving in the linear direction into the movement in the rotating direction. In addition, since a conventionally used acceleration operation lever is used, the design freedom of the carburetor is not hindered, the number of parts and assembly man-hours are not increased, and an increase in manufacturing cost is suppressed.
Further, when the first shaft for rotatably supporting the acceleration operation lever and the second shaft for rotatably supporting the pump pressing lever 30 are integrally provided in the carburetor body, the shaft portion can be easily formed and manufactured. Increase in cost can be suppressed.
[00 16 ]
【The invention's effect】
As described above, according to the sliding throttle type carburetor according to the present invention, the sliding throttle valve that is locked to one end of the accelerator wire and opens and closes the intake passage that penetrates the carburetor body by the operation of the accelerator wire, and the pump rod A sliding throttle valve type carburetor comprising: an acceleration pump device that increases and decreases the volume of the pump chamber by moving in a linear direction, and injects accelerating fuel in the pump chamber into the intake passage;
An acceleration operation lever (20) rotatably supported by a first shaft (14) provided to protrude sideways integrally with the carburetor body (1 ) is synchronized with the accelerator wire (W) by the driver. to rotational acceleration wire guide lever portion operated by accelerating wire (a) is locked (22), a cam portion having a cam surface (24A) in the rotational direction (24), to the accelerating operation lever (20) A non-circular engagement protrusion (25) formed concentrically with the center and protruding laterally ,
The pump pressing lever (30) rotatably supported by the second shaft (15) provided so as to protrude sideways integrally with the carburetor body (1) is a cam of the acceleration operating lever (20). A locking portion (32) that comes into contact with the surface (24A), and a pressing portion (33) that comes into contact with the pump rod (12),
An engagement hole (43) formed in the rotor (42) of the opening degree sensor (K) attached to the carburetor body (1) is formed in the engagement protrusion (25) of the acceleration operation lever (20). The opening degree of the sliding throttle valve can be detected without preparing a special rotation lever for detecting a rotation angle in which the rotor (42) and the acceleration operation lever (20) are synchronously rotated. An increase in manufacturing cost can be suppressed without impeding the design freedom of the sliding throttle valve type vaporizer.
The first shaft and the second shaft are provided so as to protrude sideways integrally with the carburetor body, the acceleration operation lever is rotatably disposed on the outer periphery of the first shaft, and the pump pressing lever is disposed on the outer periphery of the second shaft. According to this arrangement, it is particularly effective to suppress an increase in manufacturing cost of the bearing portion for the lever.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a sliding throttle valve type carburetor according to the present invention.
FIG. 2 is a schematic sectional view of a sliding throttle valve type vaporizer according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vaporizer body 4 Sliding throttle valve 12 Pump rod 20 Acceleration operation lever 22 Acceleration wire guide part 24 Cam part 24A Cam surface 30 Pump press lever 33 Press part A Acceleration wire W Acceleration wire

Claims (1)

A sliding throttle valve that is locked to one end of the accelerator wire and opens and closes the intake passage through the carburetor body by operating the accelerator wire, and the linear movement of the pump rod increases or decreases the volume of the pump chamber. In a sliding throttle valve type carburetor comprising an acceleration pump device for injecting acceleration fuel into the intake passage,
An acceleration operation lever (20) rotatably supported by a first shaft (14) provided to protrude sideways integrally with the carburetor body (1 ) is synchronized with the accelerator wire (W) by the driver. to rotational acceleration wire guide lever portion operated by accelerating wire (a) is locked (22), a cam portion having a cam surface (24A) in the rotational direction (24), to the accelerating operation lever (20) A non-circular engagement protrusion (25) formed concentrically with the center and protruding laterally ,
The pump pressing lever (30) rotatably supported by the second shaft (15) provided so as to protrude sideways integrally with the carburetor body (1) is a cam of the acceleration operating lever (20). A locking portion (32) that comes into contact with the surface (24A), and a pressing portion (33) that comes into contact with the pump rod (12),
An engagement hole (43) formed in the rotor (42) of the opening degree sensor (K) attached to the carburetor body (1) is formed in the engagement protrusion (25) of the acceleration operation lever (20). A sliding throttle valve type carburetor characterized in that the rotor (42) and the acceleration operating lever (20) are synchronously rotated by engaging engagement .

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