JPS6210176Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission device in a mobile agricultural machine, in particular a tiller having a double tension clutch.

Conventionally, in this type of tiller, when the power take-off shaft is used to attach working equipment such as a rotary or soil detoxifier, the power take-off shaft rotates approximately 2 times when the forward or reverse speed is low or high. There is a difference in rotational speed of about twice as much, so if you set it to high speed, the working machine would rotate at high speed, resulting in a lack of horsepower and the engine would stop, so it could only be used at low speed. For this reason, the machine could only work at low speeds and had the disadvantage of not being able to work with high efficiency.

Therefore, the present invention is configured so that low-speed rotation is always transmitted to the power take-off shaft, regardless of whether it is inserted into the low-speed side tension pulley or the high-speed side tension pulley that constitutes the double tension clutch.
It is an object of the present invention to provide a power transmission device for a mobile agricultural machine that eliminates the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the tiller 1 has a body 3 supported by wheels 2, an engine 5 and a transmission 6 are disposed on the body 3, and a handle 7 is extended. There is. As shown in FIGS. 2 to 4, the output shaft 5a of the engine 5
A large pulley 7 and a small pulley 9 are fixed to the belt, and belts 12 and 13 are loosely wound between these pulleys 7 and 9 and small and large pulleys 10 and 11 provided on the transmission 6 side, respectively. ing.
Tension pulleys 16 and 17, which are pivotally supported on the same support shaft 15, can come into contact with these belts 12 and 13, respectively, and both tension pulleys 16 and 17 are rotated by wires 19 and 20, so-called The arm 16 of the tension pulley 16 on the high speed side constitutes a double tension clutch.
A guide rod 21 extending across both belts 12 and 13 is fixed to a.
1 comes into contact with the arm 17a of the low-speed tension pulley 17 due to the rotation of the high-speed tension pulley 16 in the clutch connection direction, and the tension pulley 17
Together, they form an interlocking member that rotates in the clutch connection direction.

Further, as shown in FIG. 5, a power take-off shaft 22 is rotatably supported in the case 6a of the mission 6, and a sleeve-shaped main shaft 23 is rotatably supported coaxially with the shaft 22. There is. Further, the power take-off shaft 22 protrudes and extends from both sides of the case 6a, and the protruding part 22a on one side can be connected to a working machine by a spline, and the protruding part 22b on the other side has a large pulley 11, that is, a pulley on the low speed side. is fixed. Further, the main shaft 23 is supported by splines within the case 6 so that shifter gears 25 and 26 can only slide freely.
The small pulley 10, that is, the high-speed pulley, is fixed to the protrusion 23a, which selectively engages with the protrusion 23a and transmits power to the wheel 2, and protrudes from one side of the case 6a. Furthermore, a power take-off shaft 22 and a main shaft 23
A one-way clutch 29 is disposed between the outer retainer 23b and the outer retainer 23b, which is spline-coupled to the outer retainer 23b.As shown in FIG. 6 and FIG. The retainer 23
b, that is, transmitted to the main shaft 23.

Since this embodiment has the above configuration, both the high-speed side and low-speed side tension pulleys 16, 17
When both are cut, the rotation of the engine 5 is caused by the main shaft 23.
The power is not transmitted to the power transmission shaft 22, and the tiller 1 is stopped. From this state, as shown in FIG. 3, when the low-speed side tension pulley 17 is rotated to apply tension to the belt 13, the rotation of the engine 5 is powered by the small pulley 9, the belt 13, and the large pulley 11. Transmitted to the transmission shaft 22, one side protrusion 22a
6, the rotation of the power transmission shaft 22 is transmitted to the retainer 23b via the one-way clutch 29, and the main shaft 2
Rotate 3. As a result, the wheel 2 is driven via the shifter gear 25 or 26 and the gear 27,
The tiller 1 runs at low speed.

Furthermore, as shown in FIG. 4, when the high-speed tension pulley 16 is rotated, the guide rod 21 hits the arm 17a even though the wire 20 connected to the low-speed tension pulley 17 is loosened. The low-speed tension pulley 17 also rotates to apply tension to both the high-speed and low-speed belts 12 and 13. As a result, the main shaft 2 passes through the large pulley 7, belt 12, and small pulley 11, respectively.
3 rotates at high speed, and as described above, the power take-off shaft 22
rotates at low speed. The rotation of the main shaft 23 is transmitted to the wheels 2 via a shifter gear or the like, causing the tiller 1 to travel at high speed, and the rotation of the power take-off shaft 22 is transmitted to the working machine to drive the working machine at low speed. At this time, as shown in FIG. 7, the rotation of the main shaft 23 and therefore the retainer 23b is faster than the power take-off shaft 22, so the rotation of the power take-off shaft 22 is transmitted to the retainer 23b, and conversely, the rotation of the retainer 23b is faster than that of the power take-off shaft 22. The rotation is not transmitted to the power take-off shaft 22, and the power take-off shaft 22
is rotated at low speed by the pulley 11 without any problem.

As explained above, according to the present invention, the high-speed tension pulley 16 is provided with a low-speed tension pulley 16 so that as the high-speed tension pulley moves in the tensioning direction, the low-speed tension pulley 17 also moves in the tensioning direction. Installing an interlocking member 21 that interlocks the shaft pulley,
In addition, the power take-off shaft 22 and the main shaft 23 are arranged coaxially, and the pulley 1 of the belt transmission device in which the low-speed side tension pulley 17 operates on the power take-off shaft 22
1, and high-speed side tension pulley 1 on the main shaft 23.
The pulleys 10 of the belt transmission device in which 6 operates are connected to each other, and a clutch 29 is interposed between the power take-off shaft 22 and the main shaft 23 to transmit the rotation of the power take-off shaft to the main shaft. By operating the low-speed side tension pulley 17 or the high-speed side tension pulley 16 that constitute the double tension clutch, the power take-off shaft 22 is always moved to the low-speed side even though the aircraft 3 is traveling at low or high speed. It rotates at a high rotational speed, and as a result, it is possible to attach a working machine to the power take-off shaft 22 and work at both low speed and high speed, thereby increasing work efficiency. Furthermore, even when traveling at high speeds, the work equipment rotates at a low speed, so there is no shortage of horsepower.
There is no fear of engine stop and the conventional engine can be used as is.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a tiller to which the present invention can be applied, Fig. 2 is a plan view showing the double tension clutch portion thereof, Fig. 3 is a side view of the tiller in its low speed state, and Fig. 4 is its high speed state. side view,
FIG. 5 is a cross-sectional view of the transmission portion, FIG. 6 is a cross-sectional view showing the operation of the one-side clutch in its engaged state, and FIG. 7 is a cross-sectional view showing the operation of the one-side clutch in its idle state. 1... Mobile agricultural machine (tiller), 16, 17...
High-speed side tension pulley, low-speed side tension pulley (double tension clutch), 21... Connection member (guide rod), 22... Power take-off shaft, 23...
...main shaft, 29...on the other hand clutch.

Claims (1)

[Scope of utility model registration request] In a mobile agricultural machine having a power take-off shaft and transmitting power to the main shaft via a belt transmission device comprising high-speed side and low-speed side tension pulleys constituting a double tension clutch, the high-speed side tension pulley is provided with: A linkage member is installed to interlock the low-speed tension pulley so that the low-speed tension pulley moves in the tensioning direction as the high-speed tension pulley moves in the tensioning direction, and the power take-off shaft and the main shaft are coaxial. At the same time, the pulley of the belt transmission device in which the low-speed side tension pulley operates is connected to the power take-off shaft, and the pulley of the belt transmission device in which the high-speed side tension pulley operates is connected to the main shaft. A power transmission device for a mobile agricultural machine, in which a clutch is interposed between the main shaft and the main shaft to transmit the rotation of the power take-off shaft to the main shaft.