JP7156842B2 - handheld work machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a handheld work machine such as a chain saw, a hedge trimmer, and a power cutter. and a locking member that locks in an operating position.

In hand-held work machines such as chain saws, hedge trimmers, and power cutters, a lever, trigger, or the like for controlling the output of the prime mover, which is the power source of the work machine, is placed near the grip portion of the handle gripped by the operator. An operating portion is provided which includes an output operating member of any suitable type. As described in Patent Document 1, this operation portion includes the lock member (accelerator lock 20) that interacts so that the output operation member can be operated only when the lock member is operated, and the output Some include a position sensor (actuator 31) for detecting the position of the operating member and using it to control the prime mover.

In the electric chain saw disclosed in Patent Document 1, the lock member is arranged above the grip portion of the rear handle gripped by the operator, and the throttle trigger as an output operation member is arranged below the grip portion. Further, inside the grip portion, the position sensor is arranged above the throttle trigger and below the lock member.

Japanese Patent No. 5783680

However, in Patent Document 1, the position sensor is disposed above the throttle trigger that swings up and down in the grip portion, so at least the space for disposing the position sensor is required. The outline of the grip part had to be enlarged. For this reason, there is a problem that the operability is poor for the operator while gripping the grip portion.

The present invention has been made in view of the above circumstances, and can contribute to the compactness of the grip portion by optimizing the arrangement of the lock member, the output operation member, and the position sensor in the grip portion of the handle. Further, it is intended to provide a hand-held work machine capable of improving the handleability of the work machine.

The present invention also optimizes the method of wiring connected to the stop switch for stopping the prime mover and the position sensor. To provide a hand-held work machine that can avoid problems.

In order to solve the above-mentioned problems, the hand-held work machine according to the first aspect of the present invention includes a prime mover as a power source, a handle extending in the front-rear direction and having a grip portion to be gripped by a worker, an output operation member arranged on the lower surface of the grip portion and operated to be swung up and down by an operator to control the output of the motor; and a lock member arranged on the upper surface of the grip portion, the lock member interacting so as to operate the output operation member only when the lock member is operated ; and a second position sensor that detects that the output operation member is in the operation position, which is the state in which the output operation member is operated, and contributes to the control of the prime mover , At least part of the first position sensor is located inside the grip portion, and is located at a rear position of the output operation member, a position below the lock member, a lower end of the output operation member, and a rear end of the lock member. The second position sensor is arranged on the front side of the connecting line , and the second position sensor is arranged on the front side of the swing center axis of the output operation member .

According to a second aspect of the present invention, there is provided a hand-held work machine according to the first aspect, wherein the first position sensor is a microswitch that operates mechanically, and the output operation member is oscillated to cause the The switch part of the microswitch is pressed .

According to a third aspect of the present invention, there is provided a hand-held work machine according to the first or second aspect, wherein the output operation member is located at a first distance from the swing center axis, and the first position sensor is pressed. and a second outer shape that is located at a second distance from the swing center axis and that presses the first position sensor.

According to a fourth aspect of the present invention, there is provided a hand-held work machine according to the third aspect, wherein the output operation member has an eccentric outer shape between the first outer shape and the second outer shape.

According to a fifth aspect of the present invention, there is provided a hand-held work machine according to any one of the first to fourth aspects, wherein a stop switch operated by an operator when stopping the prime mover; a fuel tank positioned between the prime mover and the handle, wherein stop switch wiring leading to the stop switch and sensor wiring leading to the first position sensor are positioned forward of the handle; and integrated with each other at a rear position of the fuel tank.

According to a sixth aspect of the present invention, there is provided a hand-held work machine according to any one of the first to fourth aspects, wherein a stop switch operated by an operator when stopping the prime mover; a fuel tank positioned between the prime mover and the handle, wherein stop switch wiring leading to the stop switch and sensor wiring leading to the first position sensor are positioned forward of the handle; and integrated with each other above the fuel tank.

According to a seventh aspect of the present invention, there is provided a hand-held work machine according to the fifth or sixth aspect, wherein the integrated wiring is directed toward the prime mover and connected to a control device for the prime mover. .

According to an eighth aspect of the present invention, there is provided a hand-held work machine according to the fifth or sixth aspect, wherein the wiring leading to the integrated portion of the stop switch wiring and the sensor wiring is unified as a common signal line, It is characterized in that the communication signal line is connected to the control device of the prime mover.

According to a ninth aspect of the present invention, there is provided a hand-held work machine according to the eighth aspect, wherein a board is disposed in the integrated portion, and the wiring is unified by the board.

According to the present invention of claim 1, the first position sensor is located inside the handle, at the rear position of the output operation member, the lower position of the lock member, the lower end of the output operation member, and the rear end of the lock member. is arranged in front of the line connecting the As a result, the position sensor can be accommodated in the handle using the empty space inside the handle, so that the handle can be prevented from becoming thicker than necessary. Therefore, the handle can be made compact, and the operability and handleability of the working machine are improved. Further, the fact that the operator has not operated the output operation member or that the operator has operated the output operation member can be promptly received by the control device. Furthermore, since the second position sensor is provided in addition to the first position sensor, the default position and the operation position of the output operation member are detected by these position sensors. Since the second position sensor is disposed in front of the central axis of swinging of the output operation member, it does not hinder the downsizing of the handle and thus the operability and handleability of the work machine. no adverse effects of

According to the second aspect of the present invention, it is possible to reliably detect the position of the output operation member with a simple configuration.

According to the third aspect of the present invention, since the output operation member has the first outer shape that does not press the first position sensor and the second outer shape that presses the first position sensor , the output operation member swings up and down. By being operated, the first position sensor detects a pressed position where the first position sensor is pressed and a pressed release position where the first position sensor is not pressed. Therefore, the position of the output operation member can be detected with a simple configuration.

According to the fourth aspect of the present invention, the output operation member can move smoothly with respect to the first position sensor, and can smoothly move from the pressing position or the pressing release position to the pressing release position or the pressing position.

According to the fifth aspect of the present invention, since the stop switch wiring and the sensor wiring are integrated with each other at a position away from the output operation member, these wirings do not interfere with the operation of the output operation member. In addition, the front position of the handle and the rear position of the fuel tank, which are the wiring integration positions, do not adversely affect the operability and handleability of the hand-held work machine, nor are they adversely affected by the heat generated by the prime mover. Therefore, it is also advantageous in these respects.

According to the sixth aspect of the present invention, since the stop switch wiring and the sensor wiring are integrated with each other at a position away from the output operation member, these wirings do not interfere with the operation of the output operation member. In addition, the front position of the handle and the upper position of the fuel tank, which are the wiring integration positions, do not adversely affect the operability and handleability of the hand-held work machine, nor are they adversely affected by the heat generated by the prime mover. Therefore, it is also advantageous in these respects.

According to the seventh aspect of the present invention, since the wiring is connected to the control device in an integrated state, wiring weight and wiring cost can be reduced.

According to the eighth aspect of the present invention, since the wiring connected to the integrated portion of the stop switch wiring and the sensor wiring is unified as a common signal line, wiring weight and wiring cost can be reduced.

According to the ninth aspect of the present invention, the wiring can be unified and connected to the control device with a simple configuration.

1 is an overall left side view of a chain saw as a hand-held work machine according to one embodiment of the present invention; FIG. 2 is a block diagram including a control device for an internal combustion engine mounted on the chain saw of FIG. 1; FIG. FIG. 3 is a system diagram of elements related to ignition/misfire control of the internal combustion engine of FIG. 2; Fig. 2 is a left side view disclosing the internal structure of the grip portion of the rear handle of the chain saw of Fig. 1, where (a) shows a state in which the lock lever is in the lock position and the throttle trigger is in the idle position, and (b) is the lock lever; is in the release position and the throttle trigger is in the idle position, and (c) shows the state in which the lock lever is in the release position and the throttle trigger is in the full throttle position. FIG. 2 is a left side view of the body of the chain saw of FIG. 1, and is an explanatory diagram of the arrangement positions of wiring and substrates. FIG. 2 is a plan view of the body of the chain saw of FIG. 1 and is an explanatory diagram of the arrangement positions of wiring and substrates; FIG. 5 is a left side view showing another example of a combination of a throttle trigger and an idle position sensor, different from the example of FIG. 4; 8 is a left side view showing another example of a combination of a throttle trigger and an idle position sensor, different from the example of FIG. 7; FIG. FIG. 8 is a left side view showing a modification of FIG. 7 regarding the combination of the throttle trigger and the idle position sensor; FIG. 11 is a left side view showing another example of a combination of a throttle trigger and an idle position sensor;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First, referring to FIG. 1, the overall configuration of a chain saw will be described as an example of a hand-held working machine according to one embodiment of the present invention. The chain saw 1 shown in FIG. 1 includes a guide bar 3 extending in the front-rear direction from the right side of the machine body 2 (the side on the far side of the page in FIG. 1), and an endless saw chain traveling at high speed along the outer circumference of the guide bar 3. 4 and . A saw chain 4 as a tool or a cutting tool is driven to run by a small air-cooled two-cycle internal combustion engine 5 as an example of a prime mover mounted on the machine body 2 as a power source.

A recoil starter case 6 having an air intake slit 6a is attached to the left side of the fuselage 2, and a manual recoil starter 7 (see FIG. 2) is disposed in the recoil starter case 6. there is When the operator pulls the starter grip 7a, the recoil starter 7 is actuated and the internal combustion engine 5 can be started to the idle state.

A front handle 8 and a rear handle 9 are arranged on the body 2. - 特許庁An operator normally holds the front handle 8 with the left hand and the rear handle 9 with the right hand to hold the machine body 2, and the internal combustion is controlled by the throttle trigger 11 provided on the front lower surface of the grip portion 10 of the rear handle 9 as an output operation member. It controls the output of the engine 5 and controls the running speed of the saw chain 4 .

The front handle 8 is formed in a substantially L shape, and is connected to the body 2 in a vibration-isolating manner with a gap between the upper surface and the left side of the body 2 . The front handle 8 extends horizontally above the body 2 and then extends downward to the left of the body 2 . A hand guard 12 is arranged in front of the front handle 8 . The hand guard 12 is for protecting the operator's front hand at the time of kickback, which is a phenomenon in which the saw chain 4 hits a hard object and the machine body 2 vigorously rebounds toward the operator. When the hand guard 12 is pushed by the operator's front hand during kickback, the hand guard 12 also acts to actuate a brake device (not shown) for emergency stopping of the running of the saw chain 4 .

On the other hand, the rear handle 9 is formed in a substantially C-shape when viewed from the side and is connected to the rear portion of the fuselage 2 in a vibration-proof manner. An upper portion of the rear handle 9 is a grip portion 10 extending in the front-rear direction. A lock lever 13 as a locking member is arranged on the upper surface of the grip portion 10 so as to be able to move up and down, and a throttle trigger 11 is arranged on the lower surface of the front portion of the grip portion 10 so as to be able to swing up and down. there is Details of the lock lever 13 and the throttle trigger 11 will be described later.

A fuel tank 14 for the internal combustion engine 5 is arranged at a lower position between the internal combustion engine 5 and the rear handle 9 .

A stop switch 15 of a vertical switching type is arranged at the rear part of the machine body 2 and at the left position of the front part of the grip part 9 . The stop switch 15 is operated by an operator to short-circuit the electric circuit to the ignition device 16 of the internal combustion engine 5 to stop the internal combustion engine 5 .

Next, a control device for the internal combustion engine 5 mounted on the chain saw shown in FIG. 1 will be described with reference to FIGS. As shown in FIG. 2 , an intake system 17 of the internal combustion engine 5 is composed of an upstream end air cleaner 18 and a carburetor 19 disposed between the air cleaner 18 and the internal combustion engine 5 . A centrifugal clutch 20 is connected to the output shaft of the internal combustion engine 5, and the power of the internal combustion engine 5 is transmitted to the saw chain 4 via the centrifugal clutch 20 when the engine speed reaches or exceeds a predetermined speed.

The centrifugal clutch 20 is set to be engaged when the rotational speed of the internal combustion engine 5 reaches approximately 5,000 rpm. It is transmitted to the saw chain 4 . The normal rotation speed of the internal combustion engine is approximately 8,000 to 13,000 rpm.

The carburetor 19 has a throttle valve 21 which is operatively connected to the throttle trigger 11 via a transmission member such as a throttle rod 22 . The output of the internal combustion engine 5 is controlled by an operator operating the throttle trigger 11 to open and close the throttle valve 21 .

The internal combustion engine 5 has a recoil starter 7, and an operator can start the internal combustion engine 5 to an idle state by pulling a starter grip 7a. The internal combustion engine 5 also has a power generator 23 . As shown in FIG. 3, the generator mechanism 23 is composed of a combination of a generator coil 24 and a rotor 25, and the rotor 25 is provided with magnetic poles 25a. The rotor 25 is driven by the engine output, and as the rotor 25 rotates, the generator coil 24 receives magnetic flux from the magnetic poles 25a and induces a pulse voltage. The level and timing of this pulse voltage correspond to the rotation speed of the rotor 25, that is, the engine rotation speed. The voltage generated by the generator 23 is used to ignite the ignition device 16 .

Returning to FIG. 2, control of the ignition device 16, specifically ON/OFF of power supply to the ignition device 16 and ignition timing, is performed by a control device (ignition control device) 26 consisting of a microcomputer. This controller 26 substantially has a CDI type ignition control function. The control device 26 includes an ignition timing signal from the generator mechanism 23 (the rotor 25), an engine speed signal from the speed sensor 27, a first position sensor 29 for detecting the position of the throttle trigger 11, and a second position sensor 29. A trigger position signal from the sensor 30, a temperature signal of the centrifugal clutch 20 or its surroundings from the temperature sensor 31, and the like are input. Details of the first position sensor 29 and the second position sensor 30 will be described later.

As shown in FIGS. 2 and 3, the stop switch 15 is connected to the control device 26 . When the operator operates the stop switch 15, the power supply to the ignition device 16 is stopped, whereby the internal combustion engine 5 can be stopped.

Next, referring to FIG. 4, the lock lever 13, throttle trigger 11, first and second position sensors 29, 30 will be described.

As shown in FIG. 4, the lock lever 13 is attached to the grip portion 10 so that it can swing up and down around a lever shaft 13a extending in the left-right horizontal direction of the machine body 2 (perpendicular to the paper surface of FIG. 5). It is The lever shaft 13a is disposed within the grip portion 10, and the lock lever 13 includes a lever body portion 13b extending rearward from the lever shaft 13a in a side view. The lever main body portion 13b is always biased counterclockwise in FIG. 4 by a spring (not shown), and this counterclockwise rotation is caused by the lever stopper 13c being pushed by the grip portion as shown in FIG. 4(a). It is regulated by coming into contact with the inner wall surface of 10 from below. As a result, the lock lever 13 is held at the lock position L in FIG. 1 when the operator does not operate the lock lever 13 . The lever stopper 13c is formed so as to protrude rearward from the lower portion of the rear end of the lock lever 13. As shown in FIG.

The lock lever 13 locks the throttle trigger 11 at the idle position I, which is the default position (non-operating position), at the lock position L in FIG. 4(a). It acts so that the operation of the trigger 11 is permitted. That is, the lock lever 13 has a lock portion 13 d at the lower portion on the base end side, and the lock portion 13 d abuts on the upper portion of the throttle trigger 11 at the lock position L of the lock lever 13 . This locks the throttle trigger 11 to the idle position I in FIG. 4(a).

When the operator grips the grip portion 10, the lock lever 13 is pushed by the operator's palm. It becomes the release position R in FIG. As a result, the lock portion 13d of the lock lever 13 is separated from the throttle trigger 11, and the locked state of the throttle trigger 11 by the lock lever 13 is released, so that the throttle trigger 11 can be operated. When the operator releases the grip portion 10, the lock lever returns to the lock position L shown in FIG. 4(a).

As shown in FIG. 4 , the throttle trigger 11 is arranged on the lower front surface of the grip portion 10 of the rear handle 9 . The throttle trigger 11 is attached to the lower front portion of the grip portion 10 so as to swing up and down about a trigger shaft 11a extending parallel to the lever shaft 13a within the grip portion 10. As shown in FIG.

The throttle trigger 11 has a trigger main body portion 11b that spreads in a substantially fan shape at a rear position of the trigger shaft 11a in a side view. The trigger body portion 11b is always biased clockwise in FIG. 4 by a spring (not shown). regulated by As a result, the throttle trigger 11 is held at the idle position I shown in FIGS. The trigger stopper 11c is formed to protrude upward and obliquely rearward from the boss portion 11d of the throttle trigger 11. As shown in FIG.

As shown in FIGS. 4A and 4B, when the throttle trigger 11 is at the idle position I, substantially the lower half of the trigger body 11b protrudes from the lower surface 10a of the grip 10. As shown in FIGS. Corresponding to the idle position I of the throttle trigger 11, the throttle valve 21 of the carburetor 19 is at the idle opening position. Then, in the state shown in FIG. 4B, in which the lock action of the throttle trigger 11 by the lock lever 13 is released by gripping the grip portion 10, when the operator pulls the finger hook portion 11e of the trigger body portion 11b, the throttle is opened. The trigger 11 rotates counterclockwise in FIG. 4, and rotates up to the full throttle position F in FIG. 4(c). The rotation of the throttle trigger 11 in the counterclockwise direction in FIG. 4 is controlled by a stepped portion 11g formed on the rear surface of the trigger body portion 11b and a restricting portion formed on the lock lever 13, as shown in FIG. 4(c). 13f, and this state is the full throttle position F of the throttle trigger 11.

4, the throttle valve 21 of the carburetor 19 is opened toward the fully open position via a transmission member such as a throttle rod 22 (see FIG. 2). . When the operator releases the throttle trigger 11, the throttle trigger 11 returns to the idle position I and the throttle valve 21 correspondingly returns to the idle opening position.

As shown in FIG. 4, the grip portion 10 includes an idle position sensor 29 as a first position sensor and a full throttle position sensor 30 as a second position sensor for detecting the position of the throttle trigger 11. and are provided. By inputting the detection signals of these sensors 29 and 30 to the control device 26 and using them to control the internal combustion engine 5, the internal combustion engine 5 can be safely started and the internal combustion engine 5 can be smoothly accelerated and decelerated. can. Also, by combining with other sensors 27, 31, etc. shown in FIG. 2, optimal ignition control, fuel control, etc. for each operating state can be reliably performed. In the present embodiment, both the idle position sensor 29 and the full throttle position sensor 30 are microswitches that operate mechanically, and when the switches 29a and 30a are pressed or released, a detection signal is emitted. It has become. Therefore, a detection signal can be obtained with a simple structure.

The idle position sensor 29 detects that the throttle trigger 11 is in the default position (non-operated position) in which the operator does not operate it, and by inputting this detection signal to the control device 26, the internal combustion engine 5 contributes to the control of

By providing the idle position sensor 29, the fact that the operator is not operating the throttle trigger 11 is quickly received by the control device 26, so operating the throttle trigger 11 from this state allows the internal combustion engine 5 to operate safely. can start at Also, by operating the throttle trigger 11 in the acceleration direction or the deceleration direction, the vehicle can be rapidly accelerated or decelerated. Furthermore, by combining with other sensors such as the sensor 27 (see FIG. 2) for detecting the rotational speed of the internal combustion engine 5, optimum ignition control, fuel control, etc. for each operating state can be performed.

The full throttle position sensor 30 detects that the throttle trigger 11 is at the full throttle position (second position: position shown in FIG. 4(c)) corresponding to the fully open position of the throttle valve 21 of the carburetor 19, and Inputting the detection signal to the control device 26 contributes to the control of the internal combustion engine 5 . However, considering the importance of the position information of the throttle trigger 11 in the control device 26, the full throttle position sensor 30 may be omitted and only the idle position sensor 29 may be provided.

As shown in FIG. 4(b), in this embodiment, the idle position sensor 29 is disposed inside the grip portion 10, behind the throttle trigger 11, below the lock lever 13, and at the throttle position. It is positioned forward of a line 310 connecting the lower end 11h of the trigger 11 and the rear end 13f of the lock lever 13 . Here, the "lower end 11h of the throttle trigger 11" means "the lower end 11h of the throttle trigger 11 when the throttle trigger 11 is at the idle position I", and the "rear end 13f of the lock lever 13" means: It means "the rear end 13f of the lock lever 13 when the lock lever 13 is at the release position R". As a result, the idling position sensor 29 is accommodated in the grip portion 10 by using the empty space inside the grip portion 10, so that the grip portion 10 can be prevented from becoming thicker than necessary. Therefore, the grip part 10 can be made compact, and the operability and handleability of the chain saw 1 are improved. Note that at least a part of the idle position sensor 29 may be located at the position described above.

As shown in FIGS. 4(a) and 4(b), the throttle trigger 11 has an eccentric profile that makes contact with the switch portion 29a of the idle position sensor 29 when it is in the idle position I. As shown in FIG. That is, in the throttle trigger 11, the upper half of the rear surface of the trigger body portion 11b is formed in an arc shape centered on the trigger shaft 11a when viewed from the side, while the lower half of the rear surface is formed like a trigger when viewed from the side. The circular arc surface 11f is eccentric with respect to the shaft 11a.

A lower end 11h of the eccentric arcuate surface 11f forms a first profile at a first distance D1 from the trigger shaft 11a. On the other hand, the upper end 11i of the eccentric arcuate surface 11f forms a second contour at a second distance D2 from the trigger shaft 11a. The second distance D2 is longer than the first distance D1. Therefore, the eccentric arcuate surface 11f having an eccentric outer shape has the upper end 11i located farther from the trigger shaft 11a than the lower end 11h. As shown in FIGS. 4(a) and 4(b), the idle position sensor 29 is such that when the throttle trigger 11 is at the idle position I, the switch portion 29a is pushed by the upper end 11i of the eccentric arcuate surface 11f of the trigger body portion 11b. It is placed in a position where As a result, the idle position sensor 29 detects that the throttle trigger 11 is at the idle position I.

When the throttle trigger 11 is operated from the idle position I in FIG. 4(b) in the output increasing direction, the eccentric arcuate surface 11f of the trigger body 11b rotates counterclockwise as shown in FIG. 4(c). Since it moves, the trigger body portion 11b is separated from the switch portion 29a of the idle position sensor 29. As shown in FIG. As a result, the switch portion 29a of the idling position sensor 29 is released, and detection of the idling position I of the throttle trigger 11 by the idling position sensor 29 is lost. Thus, according to this embodiment, the idle position I of the throttle trigger 11 can be detected by pressing the microswitch with a simple structure. In addition, the idling position sensor 29, which is a microswitch, operates smoothly, and the idling position sensor 29 can smoothly move from the contact or non-contact position to the non-contact or contact position.

Further, in the present embodiment, as shown in FIG. 4, a full throttle position sensor 30 is arranged in front of the trigger shaft 11a of the throttle trigger 11. As shown in FIG. This arrangement position does not hinder the compactness of the grip portion 10 at all. Therefore, there is no adverse effect on the operability and handleability of the working machine.

The full throttle position sensor 30 is arranged so that the switch portion 30a is located above the trigger shaft 11a, and when the throttle trigger 11 is at the full throttle position F, as shown in FIG. It is disposed at a position where the switch portion 30a is pushed by the base portion of 11c. As a result, the full throttle position sensor 30 detects that the throttle trigger 11 is at the full throttle position F. When the throttle trigger 11 rotates from the full throttle position F in the output decreasing direction (clockwise direction in FIG. 4), the base of the trigger stopper 11c moves away from the switch portion 30a of the full throttle position sensor 30 (see FIG. 4). (b)). As a result, the switch portion 30a of the full throttle position sensor 30 is released, and the detection of the full throttle position F of the throttle trigger 11 by the full throttle position sensor 30 is lost. Thus, according to this embodiment, the full throttle position F of the throttle trigger 11 can be detected by pressing the microswitch with a simple structure.

In this embodiment, as shown in FIGS. 5 and 6, the stop switch wiring 32 connected to the stop switch 15 and the first sensor wiring 33 connected to the idle position sensor 29 are positioned in front of the rear handle 9 and fuel Behind the tank 14 and below the carburetor 19 and integrated with each other, the integrated wiring passes beside (avoids) the fuel tank 14 to the control device 26 near the internal combustion engine 5. and extend. Although not shown, it is preferable to integrate the second sensor wiring connected to the full throttle position sensor 30 as well as the first sensor wiring 33 . A substrate 34 may be arranged in the integrated portion. Further, a microcomputer may be arranged on the board 34, and this board 34 may control the internal combustion engine 5, and functionally constitutes at least part of the control device 26 shown in FIG.

According to the above configuration, the stop switch wiring 32 and the first sensor wiring 33 (furthermore, the second sensor wiring) are integrated with each other at a position away from the throttle trigger 11. does not interfere with the operation of the In addition, the front position of the rear handle 9, the rear position of the fuel tank 14, and the lower side of the carburetor, which is the integrated position of the wiring 32 and 33 (arrangement position of the board 34), adversely affects the operability and handleability of the chain saw 1. Also, it is not a position that is adversely affected by the heat generated by the internal combustion engine 5, which is also advantageous in these respects. Furthermore, since the board 34 is located near both the stop switch 15 and the idle position sensor 29, the wires 32 and 33 can be short and simple.

In another embodiment, the stop switch wiring 32 and the first sensor wiring 33 are integrated with each other at a position forward of the rear handle 9, above the fuel tank 14, and laterally of the carburetor 19. A substrate 34 may be provided in the integrated portion as indicated by broken lines in FIGS. 5 and 6 . The front position of the rear handle 9, the position above the fuel tank 14, and the position next to the carburetor 19, which is the integrated position of the wiring 32 and 33 (arrangement position of the board 34), adversely affects the operability and handleability of the chain saw 1. Also, it is not a position that is adversely affected by the heat generated by the internal combustion engine 5, which is also advantageous in these respects. In this case, the wiring 32, 33 integration position (arrangement position of the board 34) is, as shown in FIG. It is preferable that the position is closer to the side opposite to the choke lever 35). This is because the wiring 32 between the stop switch 15 can be made short and simple. In this embodiment, the stop switch wiring 32 and the first sensor wiring 33 are routed toward the integrated position (board 34) of the wirings 32 and 33 avoiding the carburetor 19. FIG.

As shown in FIG. 6, one common signal line 36 extends from the substrate 34 . The common signal line 36 is wired toward the internal combustion engine 5 and connected to the control device 26 . With this configuration, the wiring that connects the substrate 34 and the control device 26 is unified as the common signal line 36, so that wiring weight and wiring cost can be reduced.

7 and 8 may be adopted as another embodiment of the present invention. These embodiments exemplify combinations of throttle trigger 37 and idle position sensors 38, 39 that are shaped differently from those of FIG.

The throttle trigger 37 of FIGS. 7 and 8 has a first contour 37b at a first distance D1 from the trigger shaft 37a and a second contour at a second distance D2 from the trigger shaft 37a and in contact with the idle position sensors 38,39. 37c and. The second distance D2 is longer than the first distance D1. That is, the lower half of the throttle trigger 37 in FIGS. 7 and 8 in a side view is an arcuate surface 37b centered on the trigger shaft 37a as the first outer shape, and above the arcuate surface 37b, A projecting portion 37c is formed as a second outer shape. During the rotation process of the throttle trigger 37, the circular arc surface 37b does not contact the idle position sensors 38, 39. Contact.

In the example of FIG. 7, the idle position sensor 38 has a sensor lever 38b that presses the switch portion 38a, and when the throttle trigger 37 rotates clockwise in FIG. When the projecting portion 37c contacts the sensor lever 38b, the switch portion 38a is pushed by the sensor lever 38b. As a result, the idle position sensor 38 detects that the throttle trigger 37 is at the idle position I. When the throttle trigger 37 is operated from the idle position I in FIG. 7 in the output increasing direction, the projecting portion 37c rotates counterclockwise, thereby releasing the sensor lever 38b. As a result, the pressing of the switch portion 38a by the sensor lever 38b is released, and detection of the idle position I of the throttle trigger 37 by the idle position sensor 38 is lost.

In the example of FIG. 8, the idle position sensor 39 is arranged with the switch portion 39a facing upward. When the throttle trigger 37 rotates clockwise in FIG. 8 toward the idle position I, the projecting portion 37c of the throttle trigger 37 pushes the switch portion 39a. As a result, the idle position sensor 39 detects that the throttle trigger 37 is at the idle position I. When the throttle trigger 37 is operated in the output increasing direction from the idle position I in FIG. 8, the projecting portion 37c rotates counterclockwise. As a result, the pressing of the switch portion 39a of the idle position sensor 39 by the projecting portion 37c is released, and detection of the idle position I of the throttle trigger 37 by the idle position sensor 39 is lost.

Even if the swinging direction of the throttle trigger 37 and the pressing direction of the switch portion 38a are different from each other as in the example of FIG. Even in the same direction, the throttle trigger 37 has a projecting portion 37c that presses the idling position sensors 38 and 39, so that the idling position sensors 38 and 39 are pressed when the throttle trigger 37 is swung up and down. The idle position sensors 38 and 39 detect the pressing position and the pressing release position where the idle position sensors 38 and 39 are not pressed. Therefore, the position of the throttle trigger 37 can be detected by pressing the switch portions 38a and 39a of the idle position sensors 38 and 39 with a simple structure.

9 and 10 may be adopted as another embodiment of the present invention.

The example of FIG. 9 is a modified example of FIG. 7, and in the throttle trigger 37 of FIG. 37d is provided. Also, instead of the idling position sensor 38 with the sensor lever 38b of FIG. 7, an idling position sensor 29 of the same type as the microswitch in FIG. 4 is employed. According to the example of FIG. 9, since the inclined surface 37d is provided, when the throttle trigger 37 rotates, the pressing state of the switch portion 29a of the idling position sensor 29 by the projecting portion 37c and the idling position by the circular arc surface 37b. Mutual transition between the unpressed state of the switch portion 29a of the sensor 29 and the non-pressed state is made smooth. Therefore, the position of the throttle trigger 37 can be detected smoothly with a simple structure. It is preferable to form a radius between the upper end portion of the inclined surface 37d and the rear surface of the protruding portion 37c so that the mutual transition can be made even smoother.

The example of FIG. 10 employs a microswitch as the idle position sensor 40 for detecting that the throttle trigger 41 is at the idle position I when the switch portion 40a is not pressed. Correspondingly, the throttle trigger 41 has a small diameter portion 41b that does not press the idle position sensor 40 as a first outer shape located at a first distance D1 from the trigger shaft 41a, which is the swing center axis. Further, the throttle trigger 41 presses the switch portion 40a of the idle position sensor 40 below the small diameter portion 41b as a second outer shape located at a second distance D2 longer than the first distance D1 from the trigger shaft 41a. It has a large-diameter arc surface 41c. An eccentric outer shape composed of a linear portion 41d and an arc portion 41e is formed between the small diameter portion 41b and the large diameter arc surface 41c. The eccentric arcuate surface 41e is smoothly connected to the large-diameter arcuate surface 41c.

In the example of FIG. 10, when the throttle trigger 41 is at the idle position I, the idle position sensor 40 detects that the throttle trigger 41 is at the idle position I because the switch portion 40a of the idle position sensor 40 is not pressed. be done. When the throttle trigger 41 is swung from the idle position I in FIG. 10 in the output increasing direction (counterclockwise direction), the large-diameter arc surface 41c presses the switch portion 40a via the arc portion 41e as the eccentric outline. do. As a result, detection of the idle position I of the throttle trigger 41 by the idle position sensor 40 is lost. When the operator releases the throttle trigger 41, the throttle trigger 41 returns to the state shown in FIG. 10 and the pressing of the switch portion 40a is released, whereby the idle position sensor 40 detects that the throttle trigger 41 is at the idle position I. be done.

In the example of FIG. 10, the throttle trigger 41 has a protruding portion 41c that presses the idle position sensor 40. Therefore, when the throttle trigger 37 is swung up and down, the pressing position pressing the idle position sensor 40 and the idle position The idle position sensor 40 detects a pressure release position where the sensor 40 is not pressed. Therefore, the position of the throttle trigger 41 can be detected by releasing the pressing of the switch portion 40a of the idle position sensor 40 with a simple structure. Further, since the eccentric contours 41d and 41e are provided between the small-diameter portion 41b and the large-diameter arcuate surface 41c of the throttle trigger 41, when the throttle trigger 41 rotates, the idle position sensor 40 is Mutual transition between the non-pressed state of the switch portion 40a and the pressed state of the switch portion 40a of the idle position sensor 40 by the large-diameter arcuate surface 41c is made smooth. Therefore, the position of the throttle trigger 41 can be detected smoothly with a simple structure. Incidentally, the eccentric outlines 41d and 41e may be entirely formed as linear portions.

As another embodiment of the present invention, the present invention can also be applied to a hand-held work machine equipped with an electric motor as a prime mover. Examples of hand-held work machines include not only the chain saws described above, but also hedge trimmers, power cutters, and the like.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are made within the scope of the present invention. is included in the present invention. In addition, the above-described embodiments can be combined by using each other's techniques unless there is a particular contradiction or problem in the purpose, configuration, or the like.

5 Prime mover (internal combustion engine)
9 handle 10 grip 11 output operation member (throttle trigger)
11a Swing center axis (trigger axis)
11h First outline (upper end of eccentric arc surface)
11i Second outline (lower end of eccentric arc surface)
13 lock member (lock lever)
14 fuel tank 15 stop switch 26 controller 29 first position sensor (idle position sensor)
29a switch part
30 second position sensor
32 stop switch wiring 33 sensor wiring (first sensor wiring)
34 substrate 36 common signal line 37 output operation member (throttle trigger)
37b First outline (arc surface)
37c second outline (projection)
38, 39 first position sensor (idle position sensor)
40 first position sensor (idle position sensor)
41 output operation member (throttle trigger)
41b First outline (small diameter part)
41c second outer shape (large diameter arc surface)
D1 first distance D2 second distance I first position (idle position)
F second position (full throttle position)

Claims (9)

a prime mover serving as a power source; a handle extending in the front-rear direction and having a grip portion gripped by an operator; and a lock member disposed on the upper surface of the grip portion, wherein the output operation member can be operated only when the lock member is operated. a first position sensor that contributes to control of the engine by detecting that the output operation member is in a default position in which the output operation member is not operated; and a state in which the output operation member is operated. and a second position sensor that contributes to control of the prime mover by detecting that it is in the operating position of the The second position sensor is arranged at a rear position of the output operation member, a lower position of the lock member, and a front side of a line connecting a lower end of the output operation member and a rear end of the lock member. A hand-held working machine, characterized in that it is arranged in front of the swing center axis of the . 2. The apparatus according to claim 1 , wherein the first position sensor is a microswitch that operates mechanically, and the switch portion of the microswitch is pressed by the swinging of the output operation member. handheld work machine. The output operation member has a first outer shape at a first distance from the central axis of rocking so that the first position sensor is not pressed, and a second outer shape from the central axis of rocking at a second distance from the first outer shape. 3. The hand-held work machine according to claim 1, further comprising a second contour against which the position sensor is pressed. 4. The hand-held working machine according to claim 3 , wherein said output operation member has an eccentric profile between said first profile and said second profile. A stop switch operated by an operator when stopping the prime mover, and a fuel tank for the prime mover, the fuel tank being positioned between the prime mover and the handle, and connected to the stop switch. 5. A stop switch wiring and a sensor wiring leading to said first position sensor are integrated with each other at a position forward of said steering wheel and rearward of said fuel tank. Hand-held working machine described in . A stop switch operated by an operator when stopping the prime mover, and a fuel tank for the prime mover, the fuel tank being positioned between the prime mover and the handle, and connected to the stop switch. 5. A stop switch wiring and a sensor wiring leading to said first position sensor are integrated with each other at a position in front of said steering wheel and above said fuel tank. Hand-held working machine described in . 7. The hand-held work machine according to claim 5 , wherein said integrated wiring is directed toward said prime mover and connected to a control device of said prime mover. 7. The wiring connected to the integrated portion of the stop switch wiring and the sensor wiring is unified as a common signal line, and the common signal line is connected to a control device of the prime mover . Hand-held working machine described in . 9. The hand-held work machine according to claim 8 , wherein a substrate is disposed in said integrated portion, and said wiring is unified by said substrate.

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