JPH01291716A - Load controller for reaping and collecting device - Google Patents

Abstract

PURPOSE:To provide the title controller so designed that when weed-collecting load is in normal state, running speed is reduced so as to restore engine rpm, and when in abnormal state, running is stopped, thereby enabling the work to be made with full performance under an optimum engine load at all times and improving working efficiency. CONSTITUTION:Engine rpm is always detected with a rpm detector 39 during working, and variation thereof is checked with a rpm determining means 47. When lowering of the rpm is detected, a load-determining means 48 is actuated, determining whether weed-collecting load is normal or not. If the load is normal, the cause is not the clogging in a weed collector 33, i.e. the increase in running load or reaping load, therefore, tilt plate angle reduction is actuated, and a speed change gear 3 decreases the running speed so as to restore engine rpm. On the contrary, in case the weed-collecting load is abnormal, i.e. determined as being the clogging of reaped weed, operation-stopping is warned, action for the tilt plate angle to return to neutral position is actuated to return a running device to neutral state to stop running followed by actuating an engine- stopping device 41 to completely stop the operation of the engine 2. Then the weed collector 33 is inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a load control device for a grass cutting and collecting device.

(Prior Art) A vehicle body is equipped with a traveling device, a mower, and a grass collector that collects grass clippings cut by the mower into a container, and these traveling devices, mower, and grass collector are connected to an engine mounted on the vehicle body. BACKGROUND ART Grass cutting and collecting devices driven by a motor have already been widely used as riding lawn mowers.

Conventionally, the control technology for this type of grass clipping device has only been at the level of a safety device or a warning level in the event of overload, and it is necessary to judge engine loads such as running load and cutting load, and to control the grass collection load. There is no one that comprehensively performs load control by combining suitability and disapproval.

(Problems to be Solved by the Invention) Conventionally, the operator judged the load conditions such as the running load and the mowing load, and also judged the grass collection load and artificially controlled the running speed, engine rotation speed, etc. , on slopes, or in densely grassed areas, etc., and as a result, it was not always possible to carry out work while fully utilizing the capabilities of the equipment under the optimum load condition.

In view of these conventional problems, the present invention has been developed to automatically stop traveling and stop work when there is an abnormality in the grass collection load, and to perform work while fully demonstrating its ability at all times with an optimal engine load. The purpose is to do so.

(Means for Solving the Problems) To achieve this, the present invention provides a vehicle body 1 equipped with a traveling device 5.8, a mower 22, and a mower 22 for collecting grass clippings cut by the mower 22 into a grass collecting container 30. In the mowing and grass collecting device which is provided with a grass collector 33 and drives these traveling devices 5, 8, mower 22, and grass collector 33 by an engine 2 mounted on the vehicle body 1, the rotation speed for detecting the engine rotation speed is A detector 39, a load detector 45 that detects the grass collection load, a rotation speed determination means 47 that determines a decrease in the engine rotation speed based on a signal from the rotation speed detector 39, and a rotation speed determination means 47 that detects the engine rotation speed. A load determination means 48 is provided for determining whether or not the grass collection load is normal based on a signal from the load detector 45 when it is determined that the grass collection load has decreased, so that the engine speed is restored when the grass collection load is normal. It is designed to reduce the speed and stop running in the event of an abnormality.

(Function) During work, the engine 2 is started and the cutter 2 of the mower 22 is driven while driving the traveling device 5.8 at a predetermined speed.
5, the lawn etc. are successively mowed, and the grass clippings are collected by the grass collector 33 into the grass collecting container 30 through the pipes 37 and 38.

In this work, as shown in Fig. 3, the initial engine speed is first set in step (2), the initial swash plate angle of the transmission 3 is set in step (2), and after these are completed, the PTO is set in step (3). The clutch is turned on, the mower 22 and the grass collector [33] are driven by the power of the engine 2, and a predetermined work is started.

When climbing slopes during work, when mowing areas with dense grass,
Alternatively, when collecting a large amount of grass, the engine load changes accordingly, causing variations in the engine rotational speed. Therefore, during work, the engine speed is constantly detected by the engine speed detector 39, and the engine speed determination means 47 checks for fluctuations in the engine speed. When it is determined in step (2) that the engine speed has decreased, the next load determining means 48 operates, and in step (2) it is determined whether or not the grass collection load is normal.

In this case, if the grass collection load is normal, the cause is other than the clogging of the grass catcher 33, that is, an increase in the running load or the reaping load, so in step The speed change device 3 reduces the traveling speed so that the number recovers. If it is determined in step ■ that there is an abnormality in the grass collection load, that is, the grass is clogged, a stop warning is first issued in step ■, and in step ■, the swash plate angle is returned to neutral, and the traveling device 3 is returned to neutral to stop traveling. After that, in step (2), the engine stop device 41 is operated to completely stop the engine 2.

After that, the grass collector 33 is inspected.

(Example) Hereinafter, the present invention will be described in detail with reference to the illustrated example.
In Figures 1 and 2, reference numeral 1 denotes a vehicle body, and in this vehicle body 1, an engine 2 and a hydrostatic transmission 3 are installed side by side on the left and right in the center of the front and back, and a front axle 4 is connected to the front part of the vehicle body 1. A pair of left and right front wheels 5 are suspended for free rotation, and a pair of left and right rear wheels 8 are suspended at the rear via a rear axle 7 of a rear wheel differential device 6.

The engine 2 is mounted on the vehicle body 1, and the engine 2
A crankshaft 9 protruding forward from is interlockingly connected to an input shaft 11 of a transmission 3 via a wrap transmission 10.

The transmission 3 is interlocked with a gear reduction device I3 via an output shaft 12, and this gear reduction device 13 connects a rear wheel propulsion shaft 14 to a rear wheel differential device 6 to a rear wheel 8, and a front wheel propulsion shaft 15 to a front wheel. The front wheels 5 are each driven through a differential device 5°. Note that the front wheels 5 and the rear wheels 8 constitute a traveling device.

A front PTO shaft 16 is attached to the lower front end of the vehicle body 1 below the front axle 4, and the front PTO shaft 16 is operatively connected to the crankshaft 9 via a wrap transmission 17. .

18 is a step projecting forward from the vehicle body 1; 19 is a handle post attached to the front end of this step 18;
20 is a steering wheel, and 21 is a driver's seat.

22 is a mower, and a vertical shaft 24 is located below the mower deck 23.
It has three cutters 25 that rotate around it, and the grass is cut by the rotation of the cutters 25. The mower deck 23 has a gauge wheel 26 for adjusting the cutting height,
It is attached to the vehicle body 1 by two links 27 extending forward from the vehicle body 1, and can be raised and lowered by expanding and contracting a hydraulic cylinder 28. Note that each cutter 25 is rotationally driven by power transmitted from the front PTO shaft 16 via the universal joint shaft 29.

30 is a grass collecting container, and a rear frame 3 protrudes rearward from the vehicle body 1.
1 and is attached to a support column 32 erected at the rear of the vehicle body 1. Note that the grass collecting container 30 is made of punched metal or the like.

Reference numeral 33 denotes a grass collector that feeds grass clippings cut by the mower 22 into a grass collection container 30, and is attached to one side of the vehicle body 1. The grass collector 33 is a blower type equipped with a rotary impeller 35 in a casing 34, and the impeller 35 is connected to a winding transmission 36.
It is interlocked and connected to the crankshaft 9 of the engine 2 via. The suction side of the casing 34 is connected to the mower 22 via a duct 37, and the discharge side is connected to the grass collection container 30 via a duct 38.

The engine 2 has a rotation speed detector 39 that detects its rotation speed.
An engine stop device 4 such as a near solenoid or the like is provided to stop the engine 2 via a lever 40.
1 is attached. The transmission 3 is a hydrostatic type,
The swash plate angle of the hydraulic pump can be adjusted by a lever 42 and a motor 43. Note that an encoder 44 is attached to the motor 43 so as to detect the amount of change in the swash plate angle. A load detector 45 such as a pressure switch is attached to the suction side of the grass collector 33 to detect the grass collection load based on the generation status of negative pressure.

Reference numeral 46 denotes a control unit, which includes a rotation speed determination means 47 for determining a decrease in engine rotation speed based on a signal from the rotation speed detector 39;
Load determining means 48 is provided for determining whether or not the grass collection load is normal based on a signal from the load detector 45 when the rotation speed determination means 47 determines that the engine speed has decreased. The transmission 3 is decelerated via the motor 43 so that the engine speed is recovered, and in the event of an abnormality, the transmission 3 is returned to neutral, and the engine stop device 41
The vehicle is configured to stop the engine 2 and stop running. Note that this control section 46 is constituted by a microcomputer or other means.

(Effect of the invention) The present invention provides a rotation speed detector 39 that detects the engine rotation speed.
, a load detector 45 that detects the grass collection load, a rotation speed determination means 47 that determines a decrease in the engine rotation speed based on a signal from the rotation speed detector 39, and this rotation speed determination means 47.
load detector 4 determines that the engine speed has decreased.
Load determining means 48 determines whether or not the grass collection load is normal based on the signal from 5, and when the grass collection load is normal, the running speed is reduced so that the engine rotation speed is restored, and when it is abnormal, the running is stopped. As a result, instead of stopping the vehicle and canceling work when the grass collection load is abnormal, the work can be carried out while fully demonstrating its capacity with the optimal engine load, which eliminates the conventional control based on human judgment. Work efficiency is significantly improved compared to In addition, since it is designed to detect a decrease in engine speed and determine whether or not the grass collection load is normal when the engine speed decreases, it is possible to individually determine and control fluctuations in the running load, mowing load, and grass collection load. Compared to , the amount of information in the control system is smaller and control is easier.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a configuration diagram and FIG.
The figure is a side view, and Figure 3 is a flow chart. 1...Vehicle body, 2...Engine, 3...Transmission,
22... Mower, 30... Grass collection container, 33... Grass collector, 39... Rotation speed detector, 41... Engine stop device, 45... Load detector, 47... - Rotation speed determining means, 48... Load determining means.

Claims (1)

[Claims] (1) A mower 22 is attached to a vehicle body 1 equipped with traveling devices 5 and 8, and grass clippings cut by the mower 22 are placed in a grass collection container 3.
A grass collector 33 for collecting grass is provided at the grass collector 0, and these traveling devices 5,
8. In the grass cutting device in which the mower 22 and the grass collector 33 are driven by the engine 2 mounted on the vehicle body 1, a rotation speed detector 39 detects the engine rotation speed and a load detection device detects the grass collection load. 45, a rotation speed determination means 47 that determines whether the engine rotation speed has decreased based on a signal from the rotation speed detector 39, and when the rotation speed determination means 47 determines that the engine rotation speed has decreased, a signal from the load detector 45 is detected. A load determining means 48 for determining whether the grass collection load is normal or not based on the signal, and when the grass collection load is normal, the running speed is decelerated so that the engine rotation speed is restored, and when it is abnormal, the running is stopped. A load control device for a grass cutting and collecting device characterized by: