JPH0577548U - Engine for small work machine - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to obtain an engine suitable for use in various small working machines such as engine augers and brush cutters. A small working machine engine in which working means is connected to an output shaft of the engine via a centrifugal clutch mechanism and a speed reduction mechanism, and a lock mechanism is attached to a rotational force output portion of the centrifugal clutch mechanism of the engine. In this engine, when the rotational force output portion of the centrifugal clutch mechanism is fixed by operating the lock mechanism, the working means including the speed reducing mechanism located in front of the centrifugal clutch mechanism is easily fixed and held to the device body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine for a small working machine, and more specifically, to an improvement of an engine preferably used for a small working machine such as an engine auger machine and a brush cutter.

[0002]

[Prior art and problems to be solved]

 2. Description of the Related Art Conventionally, a 2-cycle gasoline engine with a displacement of about 50 cc has been widely adopted as an engine for small working machines such as an engine auger and a brush cutter because of its ease of movement, transportation or handling.

In such a small engine, a centrifugal clutch mechanism and a speed reducing mechanism are connected to the output shaft of the engine, and a working mechanism such as an auger bit and a cutting blade is connected to the speed reducing mechanism for use. It is configured as various small working machines according to the requirements.

By the way, when the auger bit is caught in an obstacle in the ground and cannot be removed while the engine auger machine or the like is being used, it includes the auger bit and the engine that are caught even if the engine is stopped. Since the equipment itself is in a substantially free state via the centrifugal clutch mechanism, it becomes difficult to pull out the auger bit. Therefore, there was a drawback that the work efficiency was extremely reduced.

Therefore, for example, lock holes are respectively formed in a predetermined portion of the device body and a predetermined reduction gear of the reduction mechanism, and lock pins are inserted into these lock holes to fix the auger to the device body. The proposed mechanism is provided for the convenience of consumers.

However, when the lock pin is inserted, it is necessary to rotate the device body to the left and right to align both lock holes, so that not only is the fixing work between the auger bit and the device body troublesome, but also the lock pin It was pointed out that there were issues to be solved, such as the need to provide a means to prevent loss.

[0007]

[Means for Solving the Problems]

 Therefore, in the present invention, a working mechanism is provided by attaching a lock mechanism to the rotational force output part of the centrifugal clutch mechanism in a small working machine in which the working mechanism is connected to the output shaft of the engine through the centrifugal clutch mechanism and the speed reduction mechanism. It aims to simplify the work of fixing the device to the main body.

In this case, the lock mechanism attached to the rotational force output portion of the centrifugal clutch mechanism is arranged so that the eccentric cam member pivotally supported by the casing of the engine body can be brought into contact with and separated from the outer peripheral portion of the clutch drum of the centrifugal clutch mechanism. If it is configured by being installed, the working means and the device body can be reliably fixed to each other even if the structure is simple, which is preferable.

Further, a lock mechanism is attached to the rotational force output part of the centrifugal clutch mechanism in a small working machine in which a working means is connected to the output shaft of the engine through a centrifugal clutch mechanism and a speed reduction mechanism, and the lock mechanism and vaporization are provided. If the opening and closing operation of the throttle valve of the device is linked, it can be configured as a safety mechanism not only for the engine auger machine but also for various small work machines.

[0010]

[Work]

 In the engine for a small work machine according to the present invention, when the lock mechanism is operated to fix the rotational force output part of the centrifugal clutch mechanism, the work mechanism including the speed reducing mechanism positioned in front of the lock mechanism is fixed and held to the device body. It is something.

[0011]

【Example】

 Next, as a preferred embodiment of the engine for a small working machine according to the present invention, an engine for an earth auger machine will be illustrated and described in detail below with reference to the accompanying drawings.

1 and 2, an engine 10 for an earth auger machine according to the present invention has a centrifugal clutch mechanism 14 and a deceleration mechanism 16 connected to an output shaft 12 of the engine protruding from a crankcase. An auger 18 as a working means is connected to the speed reduction mechanism 16.

That is, the centrifugal clutch mechanism 14 connected to the output shaft 12 of the engine includes the transmission member 20 arranged on the output shaft 12 and the clutch drum 22 on the output side, and the centrifugal clutch mechanism 14 generated by the rotation of the engine. When the force exceeds a predetermined value, the centrifugal force presses the transmission member 20 against the clutch drum 22, and the frictional force generated between the transmission member 20 and the clutch drum 22 transmits the rotational force of the engine to the shaft 24. It is supposed to do.

Further, the pinion gear 26 arranged at the end of the shaft 24 of the clutch drum 22 is composed of a first reduction gear 28 and a second reduction gear 30, the reduction ratio of which is, for example, 1 A reduction mechanism 16 set to about / 30 to 35 is arranged in mesh with the shaft 32 of the second reduction gear 30, and an auger bit 18 is connected to the shaft 32.

On the other hand, a lock mechanism 36 is attached to the outside of the clutch case 34. The lock mechanism 36 has an eccentric cam member 40 axially supported via a shaft 38 at a predetermined position on the outside of the clutch case 34, and the eccentric cam member 40 is inserted through a slit 42 formed in the clutch case 34. It faces the outer circumference of the clutch drum 22. The eccentric cam member 40 is brought into contact with the outer circumference of the clutch drum 22 by a wire operation of the operation handle 46 arranged on the grip handle 44, so that the clutch drum 22 is locked.

The eccentric cam member 40 is normally set so as to be separated from the outer circumference of the clutch drum 22 by the elastic action of the return spring 48 arranged on the shaft 38.

When using the earth auger machine equipped with the engine 10 configured as described above, when the auger bit 18 is caught in an obstacle in the ground and cannot be removed, first stop the engine. Then, if the eccentric cam member 40 is brought into contact with the outer periphery of the clutch drum 22 by operating the wire of the operation handle 46 and the clutch drum 22 is fixed to the clutch case 34, the auger bit 18 and the device main body are fixed. Therefore, the pulling operation of the auger bit 18 can be easily performed. When the pulling out work is completed, the wire operation of the operating handle 46 is stopped, the eccentric cam member 40 is separated from the outer periphery of the clutch drum 22, and the original excavation work may be performed after the engine is started.

FIG. 3 shows another embodiment of the engine for a small working machine according to the present invention. That is, the engine 50 is configured such that the operation of the eccentric cam member 40 of the lock mechanism 36 and the operation of the throttle valve 54 of the carburetor 52 in the above-described embodiment are linked by the wire member 56.

In this case, the relationship between the eccentric cam member 40 and the clutch drum 22 is normally in a locked state (the eccentric cam member 40 and the outer circumference of the clutch drum 22 are in contact with each other), and the handle 46 locks the wire by operating the wire. It is configured to release the state.

The small working machine using the engine 50 configured as described above is not limited to the earth nouga machine, and the throttle valve 54 is operated by the handle 46 to increase the output of the engine to perform a predetermined work as appropriate. Similarly, when the throttle valve 54 is squeezed by operating the handle 46 to reduce its output to about idling, the eccentric cam member 40 of the lock mechanism 36 comes into contact with the outer periphery of the clutch drum 22 by the elastic action of the return spring 48. Then, the clutch drum 22 is locked, and accordingly, the rotation of the argabit or the like as the working means is also locked, so that the occurrence of an accident or the like can be suitably prevented.

[0021]

[Effect of the device]

 As described above, according to the engine for a small work machine according to the present invention, since the lock mechanism is attached to the rotational force output part of the centrifugal clutch mechanism, the work means and the device body can be fixed with a slight handle operation. Not only can the work be performed simply, but the structure of this lock mechanism is also simple, so the increase in the manufacturing cost of the engine can be suppressed as low as possible.

Further, since the opening / closing operation of the lock mechanism and the opening / closing operation of the throttle valve of the carburetor are interlocked with each other, the safety mechanism is not limited to the illustrated working machine, but is applicable to various small working machines including an engine auger machine. It has various advantages such as suitable use, and its practical effect is extremely large.

As described above, the engine for a small working machine according to the present invention has been described by exemplifying an engine for an earth auger machine, but the present invention is not limited to this embodiment. It goes without saying that various modifications can be made without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional explanatory view of an engine for a ground auger machine as a preferred embodiment of an engine for a small working machine according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of the engine shown in FIG.

FIG. 3 is a partial cross-sectional explanatory view showing another embodiment of the engine for a small working machine according to the present invention.

[Explanation of symbols]

10 Earth auger engine, 12 output shafts, 1
4 centrifugal clutch mechanism, 16 speed reduction mechanism, 1
8 auger bits, 20 transmission members, 22 clutch drums, 24 shafts, 26 pinion gears, 28 first reduction gears, 30 second reduction gears,
32 shafts, 34 clutch case, 36 lock mechanism, 38 shafts, 40 eccentric cam member, 42
Slit, 44 grip handle, 46 operation handle, 48 return spring, 50 engine, 52 carburetor, 54 throttle valve, 56 wire,

Claims (3)

[Scope of utility model registration request] 1. A small working machine in which a working means is connected to an output shaft of an engine via a centrifugal clutch mechanism and a speed reduction mechanism, wherein a lock mechanism is attached to a rotational force output portion of the centrifugal clutch mechanism. Engine for small work machines. 2. A lock lock mechanism attached to a rotational force output portion of a centrifugal clutch mechanism includes an eccentric cam member axially supported by a casing of an engine body, the eccentric cam member being an outer peripheral portion of a clutch drum of the centrifugal clutch mechanism. The engine for a small working machine according to claim 1, wherein the engine for a small working machine is configured by being disposed so as to be able to come in and out of contact with the engine. 3. A small working machine in which a working means is connected to an output shaft of an engine via a centrifugal clutch mechanism and a speed reducing mechanism, and a lock mechanism is attached to a rotational force output portion of the centrifugal clutch mechanism and the lock mechanism is provided. An engine for a small work machine, which is configured so that opening / closing operation of a carburetor throttle valve is linked.