JPH0928103A - Walking type tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a walking type tractor improved in safety, equipped with a switch for stopping an engine and a clutch for inserting into a power transmitting path from the engine to a vehicle shaft and enabling on-off operation in interlocking the clutch with operation of the switch for stopping the engine. SOLUTION: This walking type tractor is equipped with a switch 8 for stopping an engine 1 and a clutch 7 inserted into a power-transmitting path from the engine 1 to a vehicle shaft to enable on-off operation in interlocking the clutch 7 with operation of the switch 8 for stopping the engine. Furthermore, the switch 8 for stopping the engine is preferably constituted of the first to third three changeover terminals S1 , S2 and S3 which are two stage pushing type terminals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking tractor such as a management machine.

[0002]

2. Description of the Related Art Normally, a walking tractor of this type has a mission case disposed on the rear side of a body frame having an engine mounted on the front upper side thereof, and a mission case on the lower side thereof.
An axle that interlocks with the engine and supports traveling wheels and the like is provided, and a steering handle is provided on the rear side of the machine frame.

When the above walking type tractor is used for cultivating work, for example, a rotary device is connected to a hitch provided on the machine body frame, or a rotary pawl is directly attached to the axle instead of a traveling wheel so that the rear side of the machine body is attached. An operator who follows and walks performs the tilling work while operating the steering handle.

[0004]

By the way, when performing cultivating work or the like, a so-called dash in which the aircraft suddenly starts forward may occur depending on field conditions and the like. When such a dash occurs, By operating the engine stop hand switch provided on the steering handle,
It is considered possible to ensure the safety of the operator. However, even if the engine stop switch is operated immediately, the engine may continue to rotate due to inertia, etc., and the torque from the engine does not always reach zero immediately. There still remains the problem of being hit and collided with an operator who is walking. Also, not only when dashing, but also when entering the garage of the aircraft, when the operator is steering the aircraft while holding the steering wheel at the side of the steering handle, it is recommended to operate in a narrow garage. Even if the engine stop switch is immediately operated due to an operation error, there is a delay until the aircraft actually stops, and the operator may be caught in a part of the aircraft.

An object of the present invention is to immediately stop the power transmission from the engine to the axle in an emergency such as when the aircraft is dashing or when the operator is about to be caught in a portion of the aircraft.
This is to prevent the movement of the airframe due to the inertia of the engine, etc., so that it is possible to ensure further safety for the operator.

[0006]

In order to achieve the above object, the present invention is a walk-type tractor including a steering handle 6 and an engine 1 for transmitting power to an axle 4, and an engine stop switch 8; The clutch 7 is provided on the power transmission path from the engine 1 to the axle 4, and the clutch 7 can be turned on and off in association with the operation of the engine stop switch 8.

[0007]

In an emergency such as a dash of the machine body or when the operator is about to be caught in a part of the machine body, the operator holding the steering handle 6 operates the engine stop switch 8 to The clutch 7 is disengaged regardless of whether the engine 1 is completely stopped,
The power transmission from the vehicle to the axle 4 is immediately cut off, the movement of the machine body due to inertia or the like can be immediately stopped, and more reliable safety of the operator can be secured.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 3 and 4 show a management machine as an example of a walk-behind tractor, in which a mission case 3 is arranged on a rear side of a body frame 2 having an engine 1 mounted on a front upper portion thereof. An axle 4 interlocking with the engine 1 is provided on the lower side of the mission case 3 so that a traveling wheel 41 is provided.
While a hitch 5 for supporting a rotary device and the like is mounted behind the mission case 3, a pair of left and right parts extending to the rear side of the body via a mounting rod 61 are provided on the upper side of the mission case 3. Steering handles 6 and 6 are provided.

A transmission mechanism is provided between the engine 1 and the mission in the mission case 3. The transmission mechanism includes a drive pulley 11 provided on an output shaft 10 of the engine 1 and the mission. A driven pulley 12 provided on a driven shaft 30 extending from the case 3 and a transmission belt 13 wound between the pulleys 11 and 12 are provided. Further, a tension roller 14 constituting a main clutch is swingably supported at an intermediate portion of the transmission belt 13, and the tension roller 14 is supported by the steering handle 6.
By interlocking with the main clutch lever 15 provided on one side, and by operating the lever 15, the tension pulley 14 is swung to press or separate the belt 13 from the engine 1 to the mission case 3 side. Power is transmitted or cut off. Reference numeral 16 is a cover for covering the outside of the transmission mechanism, and 17 is a shift lever provided in the transmission case 3.

In the above structure, a clutch 7 different from the main clutch is provided in the power transmission path from the engine 1 to the axle 4, and the clutch 7 is located near the main clutch lever 15 of the steering handle 6. The engine 7 is interlocked with the engine stop switch 8 and the clutch 8 is turned on and off by operating the switch 8.

As the clutch 7, in the embodiment shown in FIGS. 1 and 2, a driven shaft 30 extending from the mission case 3 is used.
A sliding body 70 that slides along the spline portion 31 formed on the driven shaft 30 and can be moved toward and away from the driven pulley 12 provided on the shaft end side of the driven shaft 30, and an operation of sliding the sliding body 70. And a body 73.

The driven pulley 12 is supported by the driven shaft 31 so as to be free to rotate, and arcuate engagement holes 12a are formed at a plurality of positions (for example, three positions) in the circumferential direction of the driven pulley 12.
On the other hand, a plurality of (three) projections 71 are provided on the wall portion of the sliding body 70 facing the driven pulley 12, and the projections 71 are formed as the sliding body 70 slides. The driven pulley 12 and the sliding body 70 are integrally coupled by being inserted into the engaging holes 12a of the driven pulley 12, and the rotational power from the transmission belt 13 is input to the driven shaft 31. By disengaging the protrusions 71 from the engagement holes 12a, the sliding body 70 and the driven pulley 12 are removed.
The rotation power is cut off by releasing the connection with.

The operation body 73 has a U-shaped frame body 74 fixed to the machine body side, and a cylindrical shaft 76 rotatably supported on the open end side of the frame body 74 via a support shaft 75. A pair of shift forks 77 and 77, which are connected to both sides in the length direction of the cylindrical shaft 76 and whose front end side is always engaged with a circumferential groove 72 provided on the outer periphery of the sliding body 70, are provided on one side thereof. A permanent magnet 78 is attached to the back of the, and an electromagnet 79 composed of an iron core 79a and a coil 79b is arranged near the magnet 78. One end of the coil 79b is attached to the charging coil 1a of the engine 1, and The other end is connected to the engine stop switch 8.

The engine stop switch 8 is of a two-stage push type and is provided with three first to third switching terminals S1, S2, S3, and the first switch is made without pushing the switch 8. When the coil 79b is excited while being connected to the terminal S1, a magnetic pole having the same polarity as that of the magnet 78 is formed on the magnet-side facing end surface of the iron core 79a, and the repulsive force at this time forms a solid line in FIG. As shown, the shift fork 77 is swung, the sliding body 70 is moved in the direction in which the driven pulley 12 approaches, and the protrusions 71 are inserted into the engaging holes 12a. As a result, the sliding body 70 is moved.
And the driven pulley 12 are integrally connected to each other, and the rotational power is transmitted from the engine 1 to the driven shaft 30.

When the switch 8 is pushed to the intermediate depth by one step and is connected to the second switching terminal S2 side, the charging coil 1a is cut off from the electromagnetic coil 79b, and the iron core 79a and the iron core 79a are disconnected from each other. By attracting the magnet 78, the sliding body 70 is moved in the direction away from the driven pulley 12 via the shift fork 77 as shown by the phantom line in the figure, and accordingly, the protrusions 71 engage with each other. When the sliding body 70 and the driven pulley 12 are disengaged from the hole 12a, the engine 1 and the driven shaft 3 are released.
The rotary power to 0 is cut off.

Further, an engine stop circuit 81 for making an emergency stop of the engine 1 is connected to the third switching terminal S3, and the switch 8 is pushed to the final depth by two steps to make the third terminal S3. When connected to
As in the case described above, the energization from the charging coil 1a to the electromagnetic coil 79b is cut off, the rotational power from the engine 1 to the driven shaft 30 is cut off, and at the same time, the engine stop circuit 81 causes the engine 1 Is urgently stopped.

Therefore, for example, when cultivating work is performed by the above management machine, a rotary device is connected to the hitch 5 so that the operator operates the steering handle 6 while walking following the rear side of the machine body. The hand switch 8 provided on the steering handle 6 is connected to the first switching terminal S1 side without being pushed, and accordingly, the sliding body 70 and the driven pulley 12 are integrally connected as shown by the solid line in FIG. By transmitting the rotational power from the engine 1 to the driven shaft 30, the cultivating work by the rotary device or the rotary claw is performed.

In an emergency such as when the management machine suddenly dashes during the plowing work as described above, the engine stop switch 8 is pushed to the intermediate depth or the final depth to perform the second or third operation. By connecting to the switching terminals S2 and S3, regardless of the rotation of the engine 1, that is, even when the engine 1 is inertially rotated, as shown by the phantom line in the figure, the sliding body 70 and the driven pulley 12 are shown. Since the rotational power from the engine 1 to the driven shaft 30 can be immediately cut off by disconnecting with the engine 1, the dash due to the inertial rotation of the engine 1 can be prevented and the operator's more reliable safety is secured. You can do it.

Further, when the above tilling work is completed and the management machine is put in the garage, the operator can operate the machine while holding the steering wheel 6 while holding the steering wheel 6 at the side. As a result, the operator may be likely to be caught in a part of the machine body. At this time, as in the case described above, the engine stop switch 8 is pushed in to operate the second or third switching terminal S2. By connecting to the S3 side, the coupling between the sliding body 70 and the driven pulley 12 can be released, and the rotational power from the engine 1 to the driven shaft 30 can be immediately cut off, so that the safety of the operator can be secured. . In the case of an emergency as described above, if the engine stop switch 8 is pushed to the final depth and connected to the side of the third switching terminal S3, the engine 1 can be stopped in an emergency. When the stop switch 8 is pushed to the intermediate depth and connected to the second switching terminal S2 side, the rotation of the engine 1 is continued, so that it is necessary to restart the engine 1 in the subsequent work. It will be convenient because there is no.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a walk-behind tractor according to the present invention.

FIG. 2 is a perspective view of a clutch.

FIG. 3 is a side view of a management machine shown as an example of a walking tractor.

FIG. 4 is a plan view thereof.

[Explanation of symbols]

 1 ... Engine 4 ... Axle 6 ... Steering handle 7 ... Clutch 8 ... Engine stop switch

Claims (1)

[Claims] 1. A walk-behind tractor comprising a steering handle (6) and an engine (1) for transmitting power to an axle (4), and an engine stop switch (8) and the engine (1) to the axle (1). 4) A walkable tractor comprising a clutch (7) interposed in a power transmission path to (4), and the clutch (7) can be turned on and off in association with an operation of an engine stop switch (8). .