JPH075233Y2 - Internal combustion engine control device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention uses an internal combustion engine as a prime mover, and in various working machines such as a cell starter brush cutter and a power spreader, the internal combustion engine is started and operated by an operator. The present invention relates to an internal combustion engine control device that controls stop and rotation speed.

[Prior Art] Conventionally, the internal combustion engine control device as described above includes a start switch that is directly operated by an operator to operate a starter motor of a self-starter, and a stop switch that is directly operated by an operator to stop the internal combustion engine. A throttle operating lever for controlling the number of revolutions of an internal combustion engine, a control wire for operating in accordance with the operating state of the throttle operating lever, and a throttle interlocking for controlling the opening of a throttle valve by interlocking with the operating state of the control wire. It was generally composed of a mechanism and.

The start switch, the stop switch, and the throttle interlocking mechanism are provided in a prime mover section of the working machine, and the throttle operating lever is operated in an operating section of the working machine (a part of a worker who is working), for example, in a brush cutter. The control wire is provided on a grip portion of the handle provided on the rod (at a position apart from the prime mover portion), and between the throttle operating lever provided on the grip and the throttle interlocking mechanism provided on the prime mover portion. It was connected with.

[Problems to be Solved by the Invention] In the conventional internal combustion engine control device as described above, since the throttle operating lever is provided in the operating portion of the working machine, the operability thereof is good, but the start switch and the stop switch are provided in the prime mover portion. Since they are provided in the above, their operability is poor and there are drawbacks such as inconvenience. In order to eliminate such a drawback, it is conceivable to provide a start switch and a stop switch in the operation section, but in that case, the start switch and the stop switch may be provided in the starter motor, the ignition coil, etc. provided in the prime mover section. Since they must be electrically connected, many of these electric wires are routed, the number of connectors increases, the configuration becomes complicated, assembly is difficult, reliability deteriorates, and the operation part and the prime mover In addition to the control wire as described above, a number of cables for electrical wiring are required as a connecting line to connect the parts to the exterior, which deteriorates the appearance. There is a drawback that the deterioration of the appearance due to the use of is remarkable.

The present invention eliminates the above-mentioned various drawbacks and has good operability. Moreover, the electric wiring is simple and does not impair reliability, and the number of connecting wires connecting the operating portion and the prime mover portion is 1 The book aims to provide an internal combustion engine control device that looks good.

[Means for Solving the Problems] In order to solve the above problems, the present invention enables a throttle operating lever and a throttle valve of an internal combustion engine to be normally operated by the throttle operating lever within a range from idle opening to full opening. At the reference position, the internal combustion engine is stopped by moving it to a stop position where it can be locked by the starting safety lock lever that is located close to the throttle operating lever, and the locking by the starting safety lock lever is released. A start / stop operation lever that starts and stops the internal combustion engine by moving the engine to the start position, and a single piece that operates according to the operation state of the throttle operation lever and the start / stop operation lever The control wire and the slot described above are linked to the operating state of the control wire. The interlocking mechanism controls the opening degree of the torque valve, the operation of the starting switch for operating the starting motor, and the operation of the stop switch for stopping the internal combustion engine.

[Operation] According to the present invention, when the throttle operating lever and the start / stop operating lever are appropriately operated, the operating states thereof are transmitted to the interlocking mechanism via one control wire,
The interlocking mechanism controls the opening of the throttle valve, the operation of the start switch, and the operation of the stop switch according to the operation state, and controls the internal combustion engine to a desired start / stop or rotational speed state.

Further, according to the present invention, if the throttle operating lever and the start / stop operating lever are provided in the operating section of the working machine, and the interlocking mechanism, the start switch and the stop switch are provided in the prime mover section of the working machine, the worker can The start / stop of the internal combustion engine and the control of the number of revolutions can all be done at hand, and the operability is good. Moreover, the electrical wiring to the start switch and stop switch is simple and the reliability is not impaired. Since the connecting wire connecting the motor and the motor part only needs the one control wire, the appearance is also good.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the drawings.

The drawing shows an example in which the internal combustion engine control device of one embodiment of the present invention is installed in a brush cutter (a). FIG. 1 is a schematic configuration diagram of one embodiment of the present invention, and FIG. It is a perspective view of a).

First, the brush cutter (a) will be briefly described. In FIG. 2, (1) is a prime mover section provided with an internal combustion engine of a small air-cooled two-cycle type or a self-starter, and (2).
Is an operating rod having a drive shaft rotated by the internal combustion engine, (3) is a cutting blade, and (4) is a U-shaped operating handle mounted on the operating rod (2). A hollow grip portion (5) formed at one end of (4) serves as an operation portion (6). The whole of the motor part (1) is covered with a cover (7), which is a so-called full cover type.

Next, the configuration of an embodiment of the present invention will be described with reference to FIG.

In FIG. 1, (8) is a throttle operating lever for adjusting the rotational speed of an internal combustion engine (not shown), (9) is a start / stop operating lever for starting and stopping the internal combustion engine,
These are provided in the grip part (5) which is the operation part (6).

In the case of the embodiment shown in the drawings, the throttle operating lever (8) is L-shaped and pivotally supported (10) inside the grip portion (5), and a part of the front surface of the grip portion (5) is cut. By being omitted, the finger hooking portion (8 ') of the throttle operating lever (8) is projected to the outside. Further, as shown in FIG. 1, the start / stop operation lever (9) contacts the throttle operation lever (8) from the side that restricts the clockwise rotation of the throttle operation lever (8). The shaft is axially supported inside the grip portion (5), and a part of the shaft is projected to the outside from a notch provided on the rear surface of the grip portion (5). The rotation range of the start / stop operation lever (9) is limited from the position in FIG. 1 to the position by the upper and lower ends of the notch of the grip portion (5). 9) is urged clockwise by the spring (12) to the position shown in FIG.

In the case of the illustrated embodiment, the starting safety lock lever (13) is also provided on the grip (5). That is, the starting safety lock lever (13) is axially supported (14) inside the grip portion (5), and a part of the pivot support (13) is provided on the operating piece (1).
3 ') is projected to the outside from the notch provided in the grip portion (5), and is further moved by the spring (15).
It is urged clockwise in the state shown in the figure. In the state shown in FIG. 1, the start safety lock lever (13) has its inner tip (13 ″) abutting the start / stop operation lever (9), and the start / stop operation lever (9). ) The counterclockwise rotation range to the position, and when the operation piece (13 ') is rotated counterclockwise by applying an operating force, the inner tip (13 ") is started. The upper end of the stop operation lever (9) is separated upward, and the start / stop operation lever (9) is rotatable counterclockwise to a position beyond the above position. The starting safety lock lever (13) is provided for safely and reliably starting and stopping the starting / stopping operation lever (9) as will be described later. It is also possible to take measures such as providing an indication of an appropriate operating state at the grip portion (5) corresponding to the position of the stop operating lever (9).

Further, in the drawing, (16) is a single control wire that operates according to the operating states of the throttle operating lever (8) and the start / stop operating lever (9).

In the illustrated embodiment, the control wire (16) is composed of an inner wire (16a) and an outer tube (16b) as a Bowden cable, and one end of the outer tube (16b) is inside the handle (4). It is fixed to a lower position of the clip portion (5), and the other end of the outer tube (16b) is fixed to a fixing member (17) projecting at an appropriate position in the prime mover portion (1). When one end of the inner wire (16a) is pulled upward from one end of the outer tube (16b) and is pulled toward the motor part (1), the operation lever (8) is rotated clockwise. To rotate to
The throttle operating lever (8) is connected at a position where it does not interfere with the start / stop operating lever (9). The other end of the inner wire (16a) is pulled out from the other end of the outer tube (16b),
One side of the interlocking lever (19) so that the interlocking lever (19) forming a part of the interlocking mechanism (18) described later rotates clockwise when pulled to the operation portion (6) side. Edge (1
9 '). The interlocking lever (19)
Is supported by a spring (21) which is rotatably supported (20) at an appropriate position in the prime mover (1) and has a weaker force than the spring (12) for urging the start / stop operation lever (9). A clockwise rotating force is applied.

Therefore, in the case of the embodiment shown in the drawings, the control wire (16) operates as follows according to the operating state of the operating levers (8), (9).
That is, first, when the operation levers (8) and (9) are not operated, the inner wire (16a) is rotated by the counterclockwise rotating force of the spring (21) of the interlocking lever (19). Although the throttle operating lever (8) tries to rotate clockwise by being pulled toward the motor part (1), the start / stop operating lever (9) is
Since the spring (12) is urged to the position by the urging force of the spring (12) and the spring (12) is stronger than the spring (21) of the interlocking lever (19), the throttle operating lever (8 ) Is regulated at the position (position) where it abuts the start / stop operation lever (9), and the operation levers (8), (9) and the inner wire (16a) are in the state shown in FIG. , The engine is stationary in the reference state corresponding to the idle rotation of the internal combustion engine. next,
By grasping the finger-holding portion (8 ') of the throttle operating lever (8), the throttle operating lever (8) is counterclockwise from the reference position against the biasing force of the spring (21) of the interlocking lever (19). When rotated in the direction (position side), the inner wire (16a) moves upward in the grip portion (5) by an amount corresponding to the rotation angle. At this time, the start / stop operation lever (9) remains at the reference position. Furthermore, without operating the throttle operating lever (8),
When the stop operation lever (9) is rotated counterclockwise (or on the position side) with respect to the reference position by using the biasing force of the spring (12), the throttle operation lever is moved by an angle corresponding to the rotation angle. Since (8) can be rotated clockwise with respect to the reference position, the inner wire (16a) is rotated by the counterclockwise rotating force of the spring (21) of the interlocking lever (19) to drive the prime mover. Since it is pulled toward the portion (1), the throttle operating lever (8) is moved to the reference by an amount corresponding to the counterclockwise rotation angle of the start / stop operating lever (9) from the reference position. Rotating clockwise from the position, the inner wire (16a) moves toward the prime mover (1) side with respect to the reference state (state shown in FIG. 1).

Further, in FIG. 1, (22) is a throttle valve built in the carburetor (23), (24) is a start switch for activating a starter motor (not shown) that constitutes a self-starter, and (25) is an electric switch. A stop switch for short-circuiting an ignition circuit (not shown) to stop the internal combustion engine, which are provided in the prime mover section (1).

In the case of the embodiment shown in the drawings, the starting switch (24) is built in when the actuator (26) is pushed, short-circuits between two built-in electric contacts, and when the actuator (26) is not pushed. The spring (27) is configured to return the actuator (26) to the projecting state and open the space between the two electric contacts. And each of the electrical contacts is a lead wire (28), (29).
Is connected to a drive circuit (not shown) of the starter motor via an electric current, and when the actuator (26) is pushed, current flows through the starter motor to rotate the starter motor and start the internal combustion engine. At the same time, when the actuator (26) is not pushed, the current supply to the starting motor is stopped.

Further, the stop switch (25), like the start switch (24), short-circuits between the two electric contacts built in when the actuator (30) is pushed, and the actuator (30) is pushed. When not in operation, the built-in spring (31) causes the actuator (30) to return to the projecting state and open the space between the two electric contacts. One of the electrical contacts is body-grounded to a body frame (not shown) via a lead wire (32), and the other is connected to an electric ignition circuit of an internal combustion engine via another lead wire (33). It is connected to the output terminal on the side opposite to the ground side of the primary coil of the ignition coil (not shown) that constitutes it. Therefore, in the case of the illustrated embodiment, when the actuator (30) of the stop switch (25) is pressed, the output terminal side of the primary coil of the ignition coil of the ignition circuit is short-circuited,
As a result, the spark plug becomes misfired and the operation of the internal combustion engine is stopped.

Further, in FIG. 1, reference numeral (18) indicates the opening degree of the throttle valve (22), the operation of the start switch (24) and the stop switch (25) in association with the operating state of the control wire (16). It is an interlocking mechanism that controls the operation.

In the case of the embodiment shown in the drawings, since the internal combustion engine is provided with the starting pressure reducer (34), the interlocking mechanism (18) is
The operation of the starting pressure reducer (34) is also controlled in conjunction with the operating state of the control wire (16). The starting decompressor (34) is a device for releasing the pressure in the cylinder (35) of the internal combustion engine at the time of starting to allow the crank shaft to easily rotate at the time of starting. Is provided to enable the use of a small one having a small torque. In the example shown in FIG. 1, the starting pressure reducer (34) includes an exhaust valve (36) for opening the inside of the cylinder (35) to the atmosphere,
And a spring (37) for holding the exhaust valve (36) in a closed state.

In the case of the embodiment shown in the drawings, the interlocking mechanism (18)
In addition to the interlocking lever (19) described above, the link rod (3
8), L-shaped interlocking lever (39), throttle control rod (40), starting lever (41), starting control rod (42), interlocking pawl (43) and stop lever (44).

The interlocking lever (19) rotates according to the operating state of the control wire (16), as is clear from the description of the operating state of the control wire (16), and eventually the interlocking lever (19). According to the operating state (, or position) of the throttle operating lever (8) and the start / stop operating lever (9), or is rotated to the position.

The L-shaped interlocking lever (39) is pivotally supported (45) at an appropriate position in the prime mover section (1) and is linked by the link rod (38) to the interlocking lever (19). It rotates in the same direction as it rotates. A guide hole (46) is provided in the L-shaped interlocking lever (39), and the upper portion of the throttle control rod (40) is inserted into the guide hole (46). Further, the lower end of the throttle control rod (40) is connected to a throttle lever (47) provided on the shaft of the throttle valve (22), and when the throttle control rod (40) moves downward, its movement amount Accordingly, the throttle valve (22) is rotated in the direction of arrow X in FIG. 1 to open. In FIG. 1, reference numeral (48) is a spring for returning the throttle valve (22) to an opening (hereinafter referred to as “idle opening”) corresponding to idle rotation of the internal combustion engine. When the throttle valve (22) is returned to the idle opening by the spring (48) and the interlocking lever (19) is at the reference position, the throttle control rod (40) has the L A nut (49) is screwed and fixed at a position where it comes into contact with the guide hole (46) of the character-shaped interlocking lever (39) from below. Therefore, in the case of the embodiment shown in the drawings, when the interlocking lever (19) is in the reference position or in the position rotated counterclockwise with respect to the reference position, the throttle valve (22) is kept at the idle opening, When the interlocking lever (19) rotates clockwise from the reference position, the throttle valve is opened according to the angle. The position of the interlocking lever (19) indicates the position where the throttle valve (22) is fully opened.

The starting lever (41) is the interlocking lever (19).
Axial support (50) is provided in the vicinity of (1) so that the lower end (41 ') of the exhaust valve (36) of the starting pressure reducer (34) abuts.
An upper end of the starting control rod (42) is connected to the starting lever (41), and a lower portion of the starting control rod (42) is provided at a suitable portion of the prime mover section (1) so as to project from a guide section ( The spring (53) is inserted between the guide hole (52) provided in the (51) and the contact portion (42a) formed at the lower end of the start control rod (42). It is provided. The contact portion (42a) of the starting control rod (42) is arranged near the upper end of the actuator (26) of the starting switch (24). The starting lever (41) is a spring (37) of the starting pressure reducer (34).
And the force of the spring (53) on the side of the contact portion (42a) of the start control rod (42) causes the first lever to move when the interlocking lever (19) is at the reference position and the position rotated clockwise from the reference position. It is restored to the state shown in the figure and stands still. When the interlocking lever (19) pivots counterclockwise from the reference position, the interlocking lever (19) contacts the upper end (41 ″) of the starting lever (41) and pivots clockwise. Therefore, in the case of the embodiment shown in the drawings, when the interlocking lever (19) is at the reference position or the position rotated clockwise from the reference position,
The exhaust valve (36) of the starting decompressor (34) is kept closed, and the actuator (26) of the starting switch (24) is kept in a protruding state so that the electrical contact between the electric contacts of the starting switch (24) is increased. It is kept open. When the interlocking lever (19) rotates counterclockwise from the reference position, the starting lever (41) rotates clockwise, and the exhaust valve (36) of the starting decompressor (34) moves. As it is moved to the left in FIG. 1 and opened, the starting control rod (42) is pushed downward and the actuator (26) of the starting switch (24) is pushed, and the interlocking lever ( When 41) reaches the starting position, the electric contacts of the starting switch (24) are short-circuited. The exhaust valve (36) is already open when the interlocking lever (19) reaches the starting position. Further, the interlocking claw (43) is provided coaxially with the L-shaped interlocking lever (39), and is configured to rotate in the same direction as the interlocking lever (19) rotates. In addition,
FIG. 1 shows the positions (,,,) of the interlocking lever (19).
,) Corresponding to the positions of the interlocking claws (43) are indicated by the same symbols (,,,). The stop lever (44) is pivotally supported in the vicinity of the stop switch (25) and returns to the position shown in FIG. 1 regardless of which direction the spring (55) rotates. There is.
Further, a cam (44a) is projected from the lower portion of the stop lever (44), and when the interlocking pawl (43) rotates counterclockwise from the reference position side, the pawl (43) Engages the cam (44a) to rotate the stop lever (44) clockwise, and when the interlocking pawl (43) reaches the stop position, the stop lever (4) causes the stop switch (4) to move. The actuator (30) of (25) is pushed so that its electrical contacts are short-circuited. The interlocking claw (4
When 3) is rotated clockwise beyond the stop position, the interlocking claw (43) is disengaged from the cam (44a). Therefore, in the case of the illustrated embodiment, the electric contacts of the stop switch (25) are short-circuited only when the interlocking lever (19) rotates counterclockwise from the reference position side to reach the stop position. Becomes

The configuration of the interlocking mechanism (18) can be appropriately changed according to the mounting location and the like. If necessary, the interlocking mechanism (18) may be configured to control the choke lever, the starting fuel supply device and the like.

Explaining the operation of the present invention having the above-mentioned structure, first, when starting the internal combustion engine, an operating force is applied to the starting safety lock lever (13) by an index finger or the like to rotate it counterclockwise. In this state, Rotate the start / stop operation lever (9) to the start position with the thumb or the like. As a result, the interlocking lever (19) is set to the starting position, the starting decompressor (34) is opened, the starting switch (24) is turned on, the starting motor is rotated, the internal combustion engine is started, and idling is performed. Then, the starting safety lock lever (13) and the starting
When the hand is released from the stop operation lever (9), the internal combustion engine returns to the state shown in FIG. 1 while maintaining idle rotation.

Next, when controlling the rotation speed of the internal combustion engine according to the working state, pull the finger hook portion (8 ') of the throttle operation lever (8) to the grip portion (5) side with an index finger or the like,
Rotate counterclockwise from the reference position. This allows
The throttle valve (22) is opened according to the rotation angle, and the internal combustion engine reaches a desired rotation speed. Although not shown in the drawing, when the number of revolutions desired by the operator is reached,
If a lock device for holding the opening of the throttle operating lever (8) is provided, the operability is further improved.

When the internal combustion engine is stopped, when the start / stop operation lever (9) is rotated to the stop position regulated by the start safety lock lever (13), the interlocking lever (19) becomes the stop position and the stop switch ( 25) is turned on, the spark plug becomes misfired, and the internal combustion engine stops. In the case of the embodiment shown in the drawings, since the start / stop operation lever (9) is regulated at the stop position by the start safety lock lever (13), the internal combustion engine can be started without erroneously operating the starting motor. Also, the stop operation is performed safely and surely.

In the above description, an example in which the present invention is equipped with a brush cutter has been described, but the present invention can also be used in various other working machines such as a spreader.

[Advantages of the Invention] According to the present invention, the operator can control the start, stop, and rotation speed of the internal combustion engine at his or her own, which has good operability. The electrical wiring is simplified and reliability is not impaired, and only one control wire is required to connect the operating part and the prime mover, so the appearance is improved and
Assembling becomes easy, and there is an effect that there is no fear of disconnection accident during work.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a schematic configuration diagram of the present invention, and FIG. 2 is a perspective view of a brush cutter equipped with the present invention. (8) …… Throttle control lever, (9) …… Start / stop control lever, (16) …… Control wire, (1
8) …… Interlocking mechanism, (22) …… Throttle valve, (2
4) …… Start switch, (25) …… Stop switch.

Claims (1)

[Scope of utility model registration request] 1. A throttle control lever (8) and a throttle valve (22) of an internal combustion engine are normally located at a reference position where the throttle control lever (8) can be freely operated within a range from an idle opening to a full opening. Starting safety lock lever (13) located close to the operating lever (8)
The internal combustion engine is stopped by moving the internal combustion engine by moving it to a stop position where the internal combustion engine is started by releasing the locking by the starting safety lock lever (13) and further moving to the starting position. Stop operation lever (9) and the throttle operation lever (8)
And one control wire (16) that operates according to the operating state of the start / stop operating lever (9), and the opening degree of the throttle valve (22) linked to the operating state of the control wire (16) And an interlocking mechanism for controlling the operation of a starting switch (24) for operating a starting motor and the operation of a stop switch (25) for stopping an internal combustion engine.