JP3546174B2 - Fuel metering device for spark ignition engine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel metering device for a spark ignition type engine, and more particularly, to a device in which a connecting rod can be disengaged from a throttle input arm while a governor lever is attached to an engine machine wall.
[0002]
[Base technology of the invention]
The base technology of the present invention is as follows.
As shown in FIG. 1, a governing lever (2), a governor lever (3), and a carburetor (4) are detachably attached to an engine machine wall (1), and a governor spring (5) is attached to the governing lever (2). The throttle input arm (7) of the carburetor (4) is interlocked and connected via the governor lever (3) and the interlocking rod (6) in order,
The governor lever (3) faces the output limiting bolt (8), and the interlocking rod (6) can be freely engaged and disengaged from the connection hole of the throttle input arm (7) by a bent portion (9) provided at one end thereof. And a carburetor (4) is a fuel metering device for a spark ignition type engine mounted on the engine wall (1) with a pair of fastening bolts (10) (11).
[0003]
[Prior art]
Conventionally, in this type of apparatus, a pair of fastening bolts are both stud bolts, these penetrate the wall of the carburetor, screw the tip screw portion to the engine machine wall, and attach a nut to the base screw portion. Screwed.
In this device, to maintain the carburetor, when removing the carburetor from the engine machine wall, it is necessary to remove both nuts and pull out the carburetor along both stud bolts.In this case, the governor lever was attached to the engine machine wall Since the bent part of the interlock rod does not come off from the connection hole of the throttle input arm, the governor lever is removed from the engine wall, the bent part of the connection rod is separated from the connection hole of the throttle input arm, and then the carburetor is pulled out. I have. After the maintenance of the carburetor is completed, the carburetor is mounted on the engine wall, the bent portion of the connecting rod is engaged with the connecting hole of the throttle input arm, and then the governor lever is mounted on the engine wall.
[0004]
[Problems to be solved by the invention]
The above prior art has the following problems.
During maintenance of the carburetor, the governor lever is removed from the engine machine wall and reassembled, so that the assembled state of the governor lever is shifted from the original assembled state. For this reason, the relative position between the governor lever and the output limiting bolt changes, and it is necessary to readjust the output limiting bolt, which complicates the maintenance work of the carburetor.
[0005]
An object of the present invention is to provide a fuel metering device for a spark ignition engine that can solve the above problems.
[0006]
[Means for Solving the Problems]
In the above-described base technology,
As shown in FIG. 1, one of the fastening bolts (10) and (11) is a stud bolt, and is penetrated through the wall of the carburetor (4). A nut (12) is screwed on the base screw portion of the machine wall (1), and the other fastening bolt (11) is a headed bolt, and a bolt head (13) is mounted on the base end. Is provided, and the wall of the carburetor (4) is made to penetrate, and the tip screw portion is screwed to the engine machine wall (1).
With the headed bolt (11) removed, the carburetor (4) is rotated (14) about the stud bolt (10) so that the governor lever (3) remains attached to the engine wall (1). The bent portion (9) of the connecting rod (6) can be disengaged from the connecting hole of the throttle input arm (7).
[0007]
Further, as shown in FIG. 2, a heat insulating plate (16) is arranged between the carburetor (4) and the exhaust muffler (15), and the heat insulating plate (16) is connected to a pair of fastening bolts (10) (11). When the carburetor (4) is pulled in and out along the carburetor (4), the carburetor (4) is arranged close to the carburetor (4) until the portion (17) near the heat shield plate interferes with the carburetor (4). When the carburetor (4) is rotated so that the portion (17) close to the heat insulating plate is separated from the heat insulating plate (16), even if the carburetor (4) is removed and inserted along the stud bolt (10), It is characterized in that the portion (17) close to the heat insulating plate is arranged at a position where it does not interfere.
[0008]
Function and effect of the present invention
As shown in FIG. 1, in order to perform maintenance of the carburetor (4), when removing the carburetor (4) from the engine machine wall (1), remove the stud bolt (10) with the headed bolt (11) removed. By rotating (14) the carburetor (4) as a center, the connecting rod (6) is bent from the connecting hole of the throttle input arm (7) while the governor lever (3) is attached to the engine wall (1). The part (9) is detached, and the carburetor (4) is pulled out along the stud bolt (10). After the maintenance of the carburetor (4) is completed, the carburetor (4) is inserted along the stud bolt (10), and the carburetor (4) is rotated around the stud bolt (10), thereby turning the governor lever (3). ) With the bent portion (9) of the connecting rod (6) engaged with the connecting hole of the throttle input arm (7) with the nut attached to the stud bolt (10) while the nut (12) is attached to the engine machine wall (1). ) Is screwed, a headed bolt (11) is attached, and the carburetor (4) is fixed. As described above, when the carburetor (4) is maintained, the governor lever (3) does not need to be attached to or detached from the engine wall (1), and the assembled state of the governor lever (3) does not shift. ) Becomes unnecessary, and the maintenance work of the carburetor (4) is simplified.
[0009]
As shown in FIG. 2, the heat insulating plate (16) can be brought sufficiently close to the carburetor (4), so that the size of the engine can be reduced.
When performing maintenance of the carburetor (4), by inserting and removing the carburetor (4) in a rotated position, the portion (17) of the carburetor (4) near the heat shield plate interferes with the heat shield plate (16). Therefore, the carburetor (4) can be attached and detached without being disturbed by the heat shield (16).
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 3 are views for explaining an embodiment of the present invention. In this embodiment, a gasoline engine is used.
The configuration of this engine is as follows.
As shown in FIG. 1, a cylinder head (19) is mounted on an upper part of a cylinder block (18), and a head cover (20) is mounted on an upper part of the cylinder head (19). An intake manifold (25) is mounted on the side of the cylinder head (19). An oil pan (21) is attached to the lower part of the cylinder block (18). A gear case (22) is assembled to the front of the cylinder block (18). An exhaust muffler (15) is arranged at the rear of the cylinder block (18).
[0011]
The configuration of the fuel metering device for this engine is as follows.
This device includes a governing lever (2), a governor spring (5), a governor lever (3), an interlocking rod (6), and a carburetor (4). The speed control lever (2) and the carburetor (4) are detachably attached to the side wall of the intake manifold (25) which forms a part of the engine wall (1). The governor lever (3) is detachably attached to a side wall of a gear case (22) which forms a part of the engine machine wall (1). The speed control lever (2) is located at the center in the front-rear direction, the governor lever (3) is located at the front, and the carburetor (4) is located at the rear. A throttle input arm (7) of a carburetor (4) is operatively connected to the speed control lever (2) via a governor spring (5), a governor lever (3), and an interlocking rod (6) in this order. An output limiting bolt (8) faces the governor lever (3), and an interlocking rod (6) is an S-shaped bent portion (9) provided at one end of the governor lever (3), and is used to connect a throttle input arm (7). The carburetor (4) is attached to the side wall of the cylinder head (19) by a pair of front and rear fastening bolts (10) (11).
[0012]
The features of this device are as follows.
Of the pair of fastening bolts (10) and (11), the previous fastening bolt (10) is a stud bolt, penetrates the wall of the carburetor (4), and has a threaded end screwed to the engine machine wall (1). And a nut (12) is screwed into the proximal screw portion, and the subsequent fastening bolt (11) is a headed bolt, and a bolt head (13) is provided at the proximal end, and the carburetor (4) And a threaded end thereof is screwed to the engine wall (1). The pair of fastening bolts (10) and (11) fasten the intake pipe (23) and the carburetor (4) to the side wall of the engine wall (1) together.
[0013]
In this apparatus, the carburetor (4) is rotated (14) about the stud bolt (10) with the head bolt (11) removed, so that the governor lever (3) is moved to the engine wall (1). The bent portion (9) of the connecting rod (6) can be engaged with and disengaged from the connecting hole of the throttle input arm (7) while being attached to the throttle input arm (7). That is, the rotation of the carburetor (4) about the stud bolt (10) allows the S-shaped bent portion (9) to pass through the connection hole of the throttle input arm (7). .
[0014]
Other features of this device are as follows.
As shown in FIG. 2, a heat insulating plate (16) is arranged between the carburetor (4) and the exhaust muffler (15), and the heat insulating plate (16) is arranged along a pair of fastening bolts (10) and (11). When the carburetor (4) is inserted and removed, the carburetor (4) is arranged close to the carburetor (4) to a position where the portion (17) near the heat shield plate interferes. Therefore, the heat insulating plate (16) can be arranged sufficiently close to the carburetor (4). As shown in FIG. 1, the heat insulating plate (16) protects the entire carburetor (4) from heat, and also protects the fuel cut solenoid (24) from heat. The fuel cut solenoid (24) operates a fuel cut valve that cuts off fuel supply from the float chamber to the fuel nozzle.
[0015]
As shown in FIG. 2, the heat insulating plate (16) is brought close to the carburetor (4), but the carburetor (4) is rotated around the stud bolt (10), and the portion (17) ) Is positioned away from the heat-insulating plate (16), the carburetor (4) is arranged at a position where the portion (17) close to the heat-insulating plate does not interfere even if the carburetor (4) is pulled out along the stud bolt (10).
[Brief description of the drawings]
FIG. 1 is a side view of a gasoline engine according to an embodiment of the present invention.
FIG. 2 is a plan view of the engine of FIG.
FIG. 3 is a rear view of the engine of FIG. 1;
[Explanation of symbols]
(1) Engine wall, (2) governor lever, (3) governor lever, (4) carburetor, (5) governor spring, (6) interlocking rod, (7) throttle input arm, (8) ... output limiting bolt, (9) ... bent part, (10) ... fastening bolt (stud bolt), (11) ... fastening bolt (headed bolt), (12) ... nut, (13) ... bolt head (14): rotation, (15): exhaust muffler, (16): heat-insulating plate, (17): part close to the heat-insulating plate.

Claims (1)

The governing lever (2), governor lever (3), and carburetor (4) are detachably attached to the engine machine wall (1), and the governor spring (5), governor lever (3), and interlocking rod are attached to the governing lever (2). (6) and the throttle input arm (7) of the carburetor (4) are linked and connected via the
The governor lever (3) faces the output limiting bolt (8), and the interlocking rod (6) can be freely engaged and disengaged from the connection hole of the throttle input arm (7) by a bent portion (9) provided at one end thereof. The carburetor (4) is mounted on the engine wall (1) with a pair of fastening bolts (10) (11), and is a fuel metering device for a spark ignition type engine.
Of the pair of fastening bolts (10) and (11), one of the fastening bolts (10) is a stud bolt, penetrates the wall of the carburetor (4), and has a threaded end screwed to the engine machine wall (1). The nut (12) is screwed into the proximal screw portion, the other fastening bolt (11) is a headed bolt, a bolt head (13) is provided at the proximal end, and the carburetor (4) Through the wall, and screw the tip of the thread into the engine wall (1).
With the headed bolt (11) removed, the carburetor (4) is rotated (14) about the stud bolt (10) so that the governor lever (3) remains attached to the engine wall (1). The bending portion (9) of the connecting rod (6) can be disengaged from the connecting hole of the throttle input arm (7) ,
A heat-insulating plate ( 16 ) is arranged between the carburetor ( 4 ) and the exhaust muffler ( 15 ), and the heat-insulating plate ( 16 ) is pulled out of the carburetor ( 4 ) along a pair of fastening bolts ( 10 ) and ( 11 ) . In this case, the carburetor ( 4 ) is arranged close to the carburetor ( 4 ) until the portion ( 17 ) near the heat shield plate interferes, but the carburetor ( 4 ) is rotated around the stud bolt ( 10 ). , if the heat insulating board inner portion (17) has a position away from the heat insulating board (16) is also Reseat carburetor (4) along the stud bolt (10), heat insulating board inner portion (17) A fuel metering device for a spark ignition engine, wherein the fuel metering device is arranged at a position where no interference occurs.

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