JP4433491B2 - Mower transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission device for a mower, and can be used for a traveling mower having a mowing device on a traveling vehicle body.
[0002]
[Prior art]
A technique is known in which a mowing device is mounted on a traveling vehicle body, and the mowing device is transmitted from an engine on the vehicle body side via a centrifugal clutch.
[0003]
[Problems to be solved by the invention]
A mowing machine that transmits a traveling device by driving an engine and also transmits a mowing device to perform cutting is disadvantageous in that it tends to cause grass clogging due to excessive load of mowing. For this reason, when an overload occurs, the travel clutch can be disengaged and the operation of moving forward can be performed after the rotation of the cutting blade is restored. The operation is cumbersome and difficult to perform accurately. Further, at the start of the mowing operation, the vehicle body often travels forward without the engine rotation increasing, i.e., the cutting blade rotation does not increase. In this case also, the grass is often clogged.
[0004]
[Means for Solving the Problems]
The invention according to claim 1 is a transmission device for a self-propelled mower that performs mowing work while driving the cutting blade device 3 and the traveling device 5 through the centrifugal clutch 2 by the rotation of the engine 1 , wherein the centrifugal clutch 2 the traveling system centrifugal clutch 4 to the transmission system path between the cutting blade 3 is provided from, as well as configured to transmitting the travel device 5 via the travel system centrifugal clutch 4, of these centrifugal clutch 2 enters the engine 1 The structure of the transmission device of the mower is characterized in that the rotation is set in a lower rotation region than the one rotation of the engine including the traveling system centrifugal clutch 4.
[0005]
[Action and effect of the invention]
According to the first aspect of the present invention, when the cutting operation is started, the centrifugal clutch 2 is engaged by the increased rotation of the engine 1 to transmit the cutting blade device 3, and when the rotation of the engine 1 further increases, the traveling system centrifugal The clutch 4 is engaged and the traveling device 5 is transmitted to perform cutting and traveling. For this reason, at the time of cutting, the cutting blade device 3 is always transmitted to the rotational speed range corresponding to the cutting load, and the cutting blade device 3 is less likely to stop during cutting or cause grass clogging. Can increase the mowing efficiency.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be used as a traveling mower having a mowing device mounted on a traveling vehicle body. A cutting blade device composed of a rotary cutting blade is mounted on the front side of a vehicle body in the form of a hand tractor, and the traveling device and the cutting blade device are driven by an engine mounted on the vehicle body to perform cutting while traveling. According to the first aspect of the present invention, the transmission device transmits the cutting blade device via the centrifugal clutch by the rotation of the engine, transmits the traveling device via the traveling system centrifugal clutch, and enters the centrifugal clutch. The engine rotation is set to a low rotation range even with the engine rotation with the traveling centrifugal clutch in place, so that the cutting blade device is less likely to stop during cutting or cause grass clogging. Can increase the mowing efficiency.
[0007]
【Example】
An embodiment of the present invention will be described with reference to the drawings. 1 to 5, the hand tractor is mounted with a cutting blade device 3 including a pair of left and right rotary cutting blades 13 on the front side of a vehicle body 12 having wheels 9, an engine 1, a handle 11, and the like that are traveling devices 5. The The wheels 9 and the cutting blade device 3 are transmitted to the transmission case 14 by the engine 1 through a transmission mechanism, a belt 15 and the like. In this transmission case 14, a centrifugal clutch 2 that is automatically turned on and off by centrifugal force by the rotation of the engine 1, a cutting blade transmission shaft 6 that is rotated by this centrifugal clutch 2, a bevel gear 16, and the like are arranged. The mowing shaft 17 is mounted so as to rotate.
A traveling centrifugal clutch 4 is provided on the cutting blade transmission shaft 6 and is automatically turned on and off by centrifugal force by the rotation of the cutting blade transmission shaft 6. From the gear 18 rotated by the traveling system centrifugal clutch 4, the traveling transmission system 7 is interlocked via the gear 19, and the axle 20 of the wheel 9 is transmitted via the reduction transmission 8 comprising a worm gear mechanism.
[0008]
The traveling device 5 is configured such that the end of the axle 20 is supported by a wheel transmission case 21 provided downward from a drive shaft 26 projecting from the transmission case 14, and the chain 22 is transmitted between the shafts 20 and 26. The traveling transmission system 7 is configured.
The cutting blade device 3 is attached to a cutting blade shaft 23 in the vertical direction, and a belt 15 is stretched between the cutting blade shaft 23 and the cutting shaft 17 to be transmitted and rotated. Reference numeral 24 denotes a grass collecting guide, and reference numeral 25 denotes a gauge wheel for grounding and supporting the front portion of the cutting blade device 3.
[0009]
Assuming that the relationship between the rotation and output of the engine 1 is an output graph F as shown in FIG. 2, the rotation system A = 3500 to 4500 (rpm) of the centrifugal clutch 2 is set as a traveling system. The rotation range B of the centrifugal clutch 4 is set as 600 to 6500 (rpm). Here, the rotational areas A and B of the centrifugal clutches 2 and 4 are low when the clutch is engaged, so the rotational speed is low, but when the clutch is disengaged, the rotational speed is low. Since it is cut, the rotation speed is at a high position.
[0010]
The mowing action by the rotation of the engine 1 is as shown in FIG. When the rotation is over the rotation and the load becomes large during the cutting operation and the rotation range of the engine 1 becomes 6500 rotations or less, the traveling centrifugal clutch 4 is turned off and the traveling is temporarily stopped. The centrifugal clutch 2 remains engaged and mowing until it reaches at least 4500 revolutions.
[0011]
As described above, in the cutting operation in the overload state, the traveling is stopped and only the mowing operation is continued, so that the cutting load is reduced. It is possible to carry out cutting and traveling.
Further, since the traveling is stopped by the mowing load in the mowing device 3, the mowing traveling can be automatically operated, and the vehicle does not travel in an overloaded state or a grass clogging state. Protection and safety can be achieved.
Next, in FIG. 6, the difference from the above example is that the cutting blade shaft of the rotary cutting blade 13 is rotated in conjunction with the cutting shaft 17. Further, the traveling transmission system 7 is simply configured to transmit the axle 20 directly via the worm gear 8.
[Brief description of the drawings]
FIG. 1 is an explanatory plan view showing a transmission mechanism of a mower according to the present invention.
FIG. 2 is an engine output graph.
FIG. 3 is a flowchart showing an operational relationship between engine rotation, a centrifugal clutch, and a traveling system centrifugal clutch.
FIG. 4 is a side view of a mower.
FIG. 5 is a plan view thereof.
FIG. 6 is an explanatory view showing a power transmission mechanism according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 2 Centrifugal clutch 3 Cutting blade apparatus 4 Traveling system centrifugal clutch 5 Traveling apparatus 6 Cutting blade transmission shaft 7 Traveling transmission system 8 Deceleration transmission apparatus

Claims (1)

In the transmission device of a self-propelled mower that performs mowing work while driving the cutting blade device (3) and the traveling device (5) through the centrifugal clutch (2) by the rotation of the engine (1) , the centrifugal clutch ( 2) cutting blade device (3) traveling system centrifugal clutch transmission system path between (4) is provided, as well as configured to transmitting the driving device (5) via the travel system centrifugal clutch (4), A transmission device for a mower characterized in that the rotation of the engine (1) including the centrifugal clutch (2) is set to be lower than the rotation of the engine (1) including the traveling centrifugal clutch (4).

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