JPH11124295A - Engine starting regulating device of portable winch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a danger based on the starting impossibility by starting operation with an overload and a sudden movement of a cargo by unexpected starting by starting an engine only when a clutch is disengaged. SOLUTION: Motive power of an engine 16 is introduced to an input shaft 44 of a transmission 20 through a centrifugal clutch 42, and is transmitted to an output shaft 50 through a worm mechanism 46 and a bevel gear speed reduction mechanism 48. A clutch 52 to connect/disconnect motive power from the transmission 20 is arranged in the bevel gear speed reduction mechanism 48, and applies braking to a transmission shaft 54 by a lining brake 56. When braking is applied, the input shaft 44 and the outside shaft 50 are connected to each other, and when braking is not applied, the transmission shaft 54 only freely rotates, and the output shaft 50 is not driven. That is, the engine 16 cannot be started when the clutch 52 is connected as it is. Therefore, a danger based on the starting impossibility by starting operation with an overload and a sudden movement of a cargo by unexpected starting, can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable winch engine starting control device used for cutting wood in a mountain forest.

[0002]

2. Description of the Related Art A small and lightweight portable portable winch having an engine and a drum is known (for example, Japanese Utility Model Publication No. 4-039253). In the power system of this portable winch, the power of the engine is transmitted to a drum via a transmission. In this case, the power system of the engine, the transmission, and the drum cannot be directly connected, and the transmission incorporates a clutch for interrupting the output.

Therefore, when starting the engine, it is necessary to disconnect the clutch. Since the wire that suspends the load is unwound from the drum, when the engine is stopped while the load is being restarted, the engine may be overloaded if the load is still applied and the engine may not be able to start. Because. Even if it can be started, it is dangerous if the load suddenly starts moving.

[0004]

For this reason, conventionally, the operation of disconnecting the clutch was performed before the start, but it has often been forgotten. The present invention
In order to cope with such a problem, the engine cannot be started while the clutch is connected. In other words, the engine can be started only when the clutch is disengaged.

[0005] By the way, the output shaft of the engine is usually
There is a question that this clutch can be used at low engine speeds when starting because of the built-in centrifugal clutch, but the reliability of this centrifugal clutch cannot be said to be very high. Is dangerous. In addition, at low temperatures, the engine may have to be started at a considerably high rotation speed at which the centrifugal clutch is connected.

[0006] On the other hand, the winch drum must not only be capable of intermittent power but also be capable of taking a free state and a brake state according to the working form. That is, the drum must be in a free state when unwinding the wire, and must be in a brake state when stopped halfway. For this reason, the drum needs a brake,
This type of winch is required to be inexpensive, and it is difficult to meet such demands. Therefore, the present invention has solved this problem by providing the clutch with a braking function.

[0007]

SUMMARY OF THE INVENTION Under the above-mentioned problems, the present invention has a power transmission path to an engine, a centrifugal clutch, a transmission and a drum, of which a transmission incorporates a clutch for interrupting its output. In a portable winch, there is provided an engine start restricting device for a portable winch, wherein an engine can be started only when a clutch is disengaged.

By the above means, the engine cannot be started when the clutch is connected.
It is possible to eliminate a danger caused by a start failure due to a start operation with an overload or a sudden movement of a load due to an unexpected start.

The present invention also provides a means in which the above-mentioned clutch has a braking function of braking the rotation of the drum when connected. By this means, the drum brake mechanism becomes unnecessary, and the cost can be reduced. As a result, even when the engine is stopped during the load hanging operation with the clutch connected, the load stops at that position, which is safe.

According to the above means, when the engine is restarted, the clutch is disengaged. At that time, the load unloads. However, as long as the operator is aware of this fact, it is not safe. There is no problem, and if necessary, appropriate safety measures such as unloading may be taken.

Further, the present invention provides a means in the above winch, wherein the operation of turning the accelerator lever of the engine and the operation of connecting and disconnecting the clutch are operated by a servomotor controlled by radio control radio waves. Since it is not necessary to go to the winch one by one when performing these operations, the operability is improved and the efficiency is improved. In particular, since this winch is often used in a forest with a poor scaffold, this means is significant.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 7 is a partial cross-sectional side view of a portable winch showing an example of the present invention, and FIG. 8 is a rear view. The portable winch includes a main body 10 and a guide pole 12.

The main body 10 has an engine 16 mounted on the front (rightward in FIG. 7) of a sled-shaped base 14 and a winch 18 mounted on the rear. The engine 16 is provided in an inclined position slightly raised upward, and connects the mission 20. The winch 18 is mainly composed of a drum 24 whose both sides are covered with a cover 22, and the drum 24 and the transmission 20 are connected by a belt pulley mechanism 26. In addition, the base 14 is provided with wheels 28 that are used to move when detached.

The guide pole 12 has its base end fixed to the upper part of the cover 22 of the main body 10 and extends horizontally (to the right in FIG. 7) in the horizontal direction. At the tip of the guide pole 12, a wire 3 wound around a drum 24 is attached.
A guide roller 32 for guiding the zero is mounted. Also, a ring 34 for passing a rope or the like tied to the trunk is provided at the front and rear ends of the guide pole 12.

The portable winch of this embodiment is of a radio-controlled type, and is provided with equipment related thereto. Operated by the radio control are the accelerator lever for controlling the rotation speed of the engine 16, the transmission 20, and the drum 24.
These clutches are designed to be driven by a servomotor controlled by radio control radio waves.

For this purpose, boxes 36 and 38 are attached to both sides of the main body 10, and two servo motors and the like are separately stored in the boxes 36 and 38. In this case, both boxes 36 and 38 protrude from the lower projected area of the base 14, but guards 4 are provided on both sides of the base 14.
If 0 is protruded in a wing shape so as to fit within its projected area, it is protected from obstacles and the like.

FIG. 6 is a schematic diagram of a power system from the engine 16 to the drum 24. The mission 20 used here is of a bevel gear type. That is, the power of the engine 16 is introduced to the input shaft 44 of the transmission 20 via the centrifugal clutch 42 and the worm mechanism 4
6, transmitted to the output shaft 50 via the bevel gear reduction mechanism 48, and transmitted to the drum 24 by the belt pulley mechanism 26.

A bevel gear reduction mechanism 48 is provided with a clutch 52 for interrupting the power from the mission 20. In other words, the transmission shaft 54 provided so as to be rotatable relative to the output shaft 50 is braked by the lining brake 56. When the braking is performed, the input shaft 44 and the output shaft 50 are connected. Just rotate freely,
The output shaft 50 is not driven (free rotation of the drum 24 is allowed). This relationship is the same even when the rotation of the input shaft 44 is zero. In this regard, when the clutch 52 is connected, it can be said to be a kind of brake that regulates the free rotation of the drum 24. is there.

In the case of the radio control operation, a servomotor 58 is used to apply a braking force to the brake 56. FIG. 1 is a cross-sectional view of the box 36 showing this attachment, and FIG. 2 is a cross-sectional view of FIG.
The brake is applied by pressing the shoe 62 against the drum 60 fixed to the transmission shaft 54, and the shoe 62 is pressed by rotating the brake lever 64.

Therefore, the output shaft 66 of the servomotor 58
When the output shaft 66 rotates, the link mechanism 68 moves to rotate the brake lever 64 against the force of the spring mechanism 70, and the shoe 62 Is operated to brake the drum 60, and when the rotation of the output shaft 66 is stopped, the brake lever 64 is returned to the original position by the urging force of the spring mechanism 70.
Is to release the braking.

FIG. 3 is a rear view of a box 38 accommodating a servomotor 72 for operating an accelerator lever of the engine 16, and FIGS. 4 and 5 are side views. A crank mechanism 76 is attached to an output shaft 74 of the servomotor 72. An accelerator lever (not shown) and a harness 78 are provided by the crank mechanism 76.
In this case, the accelerator wire 80 connected by the arrow is pulled via a spring 82.

The box 38 also houses a receiver 84 for receiving radio-controlled radio waves.
Is connected by a conducting wire from a telescopic antenna 86 provided along the outside of the antenna. By doing so, the radio control equipment can be centrally deployed, and the design is compact and neat. Further, the box 38 can be opened and closed by operating a lock 88 so that the inside can be inspected.

Next, how to use the portable winch will be described. FIG. 9 is an explanatory view showing a use state. When this winch is used, in many cases,
In order to increase the ground height of the wire 32 and avoid obstacles between the guide poles 12, the guide pole 12 is brought close to the tree 90 and rises at a right angle (for this reason, the guide pole 12 is provided with a posture changing means. However, the details are omitted here). Then, the tree 90 and the above-described ring 34 provided on the guide pole 12 are bound by a rope 92 or the like, and the guide pole 12 is fixed to the tree 90.

When the above operation is completed, the clutch 52
To make the drum 24 free, the wire 32 is pulled out of the drum 24, and a hook 94 provided at the end thereof is provided.
And wrap it around a towed object such as wood. Next, if the clutch 52 is connected, the drum 24 rotates and the wire 3
2 is wound on the drum 24 and the towed object is drawn. When this operation is performed at a place away from the winch, the above-mentioned radio control operation is performed.

FIG. 10 is a front view of a transmitter 96 for transmitting a radio-controlled radio wave to the receiver 84. The transmitter 96 controls the on / off state of an accelerator button 98 for adjusting the rotational speed of the engine 16 and the clutch 52. A clutch button 100 is provided, and by pressing an appropriate one of the respective buttons 98, 100, the corresponding servomotor 58,
A predetermined rotation angle is commanded to 72. In addition, the transmitter 96 is also provided with a transmitting antenna 102 and a stop button 104 for the engine 16, and the engine 16 can be stopped by pressing the stop button 104.

In the present invention, the engine 16 cannot be started with the clutch 52 connected. Specifically, a switch (relay) for switching between an ignition line and a short circuit is inserted in the ignition circuit of the engine 16. When the clutch button 100 of the transmitter 96 is turned "OFF", the relay operates to switch the short-circuit line to the ignition line.

The engine 16 is started by a recoil starter or a starter motor. The power to the receiver 84 is also turned on manually.
You can't operate without going to. Both are for safety considerations.

These controls are based on software programs. FIG. 11 is a flowchart of the operation. When the engine 16 is stopped, it is determined whether the clutch 52 is disconnected or connected. If they are connected, they become short-circuited and cannot be started. The operation of pressing the stop button 104 of the engine 16 switches the ignition circuit to a short circuit.

In this case, whether or not the engine 16 is stopped can be determined by the waveform of the current flowing through the ignition circuit. This is because the current flowing through the ignition circuit is a pulse current, and if there is no pulse for a certain period of time or if the interval is longer than a specified period, it can be determined that the operation has stopped or is in a state close to stopping.

The above description is of the case of a radio control type, but the present invention is of course possible even if the type is a manual type. Even in the manual operation type, the hardware of the power system such as the mission 20 and the clutch 52 does not change, and only the operation is performed with the lever or the like provided in the main body 10, so only when the clutch 52 is in the disconnected state. , An ignition line.

[0031]

As described above, according to the present invention, the engine cannot be started when the clutch is engaged, so that the engine cannot be started by an overloading start operation or sudden movement of a load due to an unexpected start. Dangers based on

[Brief description of the drawings]

FIG. 1 is a sectional rear view of one box showing an example of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional rear view of the other box showing an example of the present invention.

FIG. 4 is a side view of the other box showing an example of the present invention.

FIG. 5 is a side view of the other box showing an example of the present invention.

FIG. 6 is a power system diagram showing an example of the present invention.

FIG. 7 is a side view of a portable winch showing an example of the present invention.

FIG. 8 is a rear view of a portable winch showing an example of the present invention.

FIG. 9 is an explanatory view showing a use state of a portable winch showing an example of the present invention.

FIG. 10 is a front view of a transmitter showing an example of the present invention.

FIG. 11 is a control flowchart illustrating an example of the present invention.

[Explanation of symbols]

 16 Engine 20 Transmission 24 Drum 42 Centrifugal Clutch 52 Clutch 58 Servomotor 72 Servomotor

Claims (3)

[Claims] 1. A portable winch having a power transmission path to an engine, a centrifugal clutch, a transmission, and a drum, wherein a transmission has a built-in clutch for interrupting its output. An engine start restricting device for a portable winch, characterized in that the start is enabled. 2. The device according to claim 1, wherein the clutch has a brake function for braking the rotation of the drum when connected. 3. The device for restricting engine start of a portable winch according to claim 1, wherein the operation of turning the accelerator lever of the engine and the operation of connecting and disconnecting the clutch are operated by a servomotor controlled by radio control radio waves. .