JP2006258060A - Farm working machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve fuel economy by preventing a wasteful high-speed rotation of an engine at the time of pause in farm working machinery in which a PTO clutch is arranged in a transmission system from the engine to a working device 4. <P>SOLUTION: A regulating mechanism 21 for the engine 8 is constituted in a controllable manner. Based on that both of the disengagement state of the PTO clutch 18 and the travel stop state are detected, deceleration control of the regulating mechanism 21 is performed until it is brought into a predetermined idling set condition. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a farm work machine such as a mower connected with a mower as a work apparatus and an agricultural tractor connected with a rotary tiller as a work apparatus.

The mower, which is an example of the farm work machine, is configured such that the mower connected to the front of the machine body can be arbitrarily stopped by inserting a PTO clutch in the transmission system from the engine to the mower (for example, Patent Documents). 1).
JP-A-11-206219

  In general, the speed control mechanism of the engine mounted on the agricultural machine is accelerator set by adjusting operation with a hand accelerator lever that can be held at an arbitrary operation position. Work with output.

  However, according to the above configuration, when the PTO clutch is disengaged in the middle of work and the work device is stopped and the travel is stopped and the work travel is temporarily stopped, the engine continues to be driven at a high speed and the fuel is stopped. Will be wasted. Of course, it is only necessary to perform the accelerator down operation or stop the engine with the hand accelerator lever, but it is troublesome to perform such an operation for each pause and is often left at a high speed. .

  The present invention has been made paying attention to such points, and has an object to improve fuel consumption by avoiding unnecessary high-speed operation of the engine even during a pause.

A first aspect of the present invention is a farm work machine in which a PTO clutch is interposed in a transmission system from an engine to a work device.
The engine speed-control mechanism is configured to be controllable, and the accelerator-down control is performed until the speed-control mechanism is in a predetermined idling set state based on detection of both the disengagement state and the travel stop state of the PTO clutch. Means are provided.

  According to the above configuration, when the PTO clutch is disengaged in the middle of the work to stop the working device, and when the running is stopped and the work running is paused, this is detected and the accelerator down control is automatically performed, and the engine is set to the idling set. Operates with less fuel consumption.

  Therefore, according to the first aspect of the invention, it is possible to improve the fuel consumption by avoiding the engine from operating at high speed even during a temporary pause during work.

According to a second invention, in the first invention,
The control means is configured to perform accelerator-up control of the speed governing mechanism to a predetermined high-speed rotation set state when both the disengaged state and the travel stop state of the PTO clutch are not detected.

  According to the above configuration, the accelerator down control is automatically performed when the PTO clutch is disengaged in the middle of the work to stop the work apparatus and the work is stopped and the work is temporarily stopped. When the clutch is engaged and the drive of the work device is resumed, the engine is automatically accelerator-up controlled to the high-speed rotation set state, and even if the work is run immediately, the engine stops due to the running load or work load. There is nothing wrong.

According to a third invention, in the second invention,
An accelerator adjusting tool for artificially adjusting and holding the high-speed rotation set state is provided.

  According to the above configuration, after being controlled to the idling set state by the accelerator down control, when the traveling or the work traveling is resumed, the accelerator up control is performed to the original high-speed rotation set state, which is set in advance. It is possible to perform traveling and work traveling.

4th invention is the invention in any one of said 1st-3rd,
The traveling speed is changed by a continuously variable transmission capable of switching between forward and backward travel, and the shift operating tool for operating the continuously variable transmission is detected at the neutral position and recognized as the traveling stop state. The control means is configured.

  According to the above configuration, for example, the travel stop state can be accurately detected with a simple structure in which the rotational position of the support shaft of the speed change operation tool is detected by a single limit switch. While providing the effect of any one of the inventions, the traveling stop state detection structure can be configured at low cost.

A fifth invention is the invention according to any one of the first to fourth inventions,
The control means is configured to perform accelerator down control until the speed control mechanism is in a predetermined idling set state when a high temperature state higher than the setting of the engine cooling water is continued for a set time or longer.

  According to the said structure, while bringing the said effect of any one of the said 1st-4th invention, an engine overheating can be avoided beforehand by using accelerator down control effectively.

  In this case, if the buzzer or lamp is used to notify that a high temperature state higher than the setting of the engine cooling water has continued for the set time or longer, the cause of the accelerator down control can be easily recognized. Measures such as down operation and replenishment of cooling water can be taken promptly, and practical convenience is further enhanced.

  1 and 2 show a side surface and a plane of a riding mower as an example of a farm working machine according to the present invention. This riding-type mower has a lift arm 5 in which a mower 4 as a working device is hydraulically driven at the front part of a four-wheel drive type traveling machine body 3 having a front wheel 1 with a fixed orientation and a rear wheel 2 that can be steered. The basic structure connected so that raising / lowering was possible.

  A water-cooled engine 8 with a radiator 7 placed in front is mounted on the rear part of the main frame 6 disposed at the lower part of the traveling machine body 3 and is covered with an engine bonnet 9 that can swing up and down. 10 is configured, and a driving seat 11 is provided in front of the driving unit 10, and an arched fall protection frame 12 is erected and arranged between the driving unit 10 and the driving seat 11. A steering handle 13 for steering the rear wheel 2 is provided in front of the seat 11.

  As shown in the transmission system diagram of FIG. 3, the output from the engine 8 is input to a hydraulic continuously variable transmission (HST) 15 provided at the front of the fuselage, and is continuously shifted in the forward and reverse ranges. After that, the vehicle is decelerated by the gear reduction mechanism 35 in the transmission case 16 connected to the front portion and transmitted to the front wheels 1, and the traveling system power branched in the transmission case 16 is transmitted to the rear wheels 2. It has become so. The continuously variable transmission 15 is linked to a shift pedal (transmission operation tool) 17 provided on the right side of the foot of the driving unit, and increases from neutral to forward as the shift pedal 17 is stepped forward. Further, as the shift pedal 17 is depressed backward, the speed is increased from neutral to the reverse side, and when the shift pedal 17 is released, it returns to neutral.

  A part of the power input to the continuously variable transmission 15 is input to the transmission case 16 as it is, is transmitted to the PTO shaft 19 at the front end of the case via the gear reduction mechanism 36 and the PTO clutch 18, and is taken out from the PTO shaft 19. The mower 4 is driven by the working power. The PTO clutch 18 is linked to a PTO clutch lever 20 disposed on the side of the driver seat. The PTO clutch 18 is turned “on” by the front operation of the PTO clutch lever 20, and the PTO clutch 18 is turned “by” by the rear operation. It can be switched to “OFF”.

  As shown in FIG. 4, the speed adjusting mechanism 21 provided in the engine 8 is provided with a speed adjusting lever 22 spring-biased to the “low speed” side, and this speed adjusting lever 22 is a hand accelerator lever (accelerator). The accelerator set is performed by an artificially and electrically controlled operation by the adjusting tool 23 and the electric motor 24. Hereinafter, the accelerator set structure of the speed control mechanism 21 will be described.

  The hand accelerator lever 23 is arranged to be swingable on the operating part and to be able to hold friction at an arbitrary operation position. The hand accelerator lever 23 and the speed control lever 22 are interlocked and connected by an operation wire 25. . The outer end of the operation wire 25 on the speed adjusting mechanism side is connected and supported by a wire receiving member 26 that is switched and swung to two positions by the electric motor 24.

  The wire receiving member 26 is normally at the “reference” position, and the hand accelerator lever 23 is adjusted in the range from the minimum speed “min” to the maximum speed “max” in the wire support state, thereby the speed control lever 22 is stopped by the stopper. It is possible to arbitrarily set the accelerator within the maximum speed range from idling received and regulated at 27. Further, when the wire receiving member 26 is switched to the “deceleration” position by the electric motor 24, the outer end is displaced in the direction of loosening the operation wire 25, and the speed control lever 22 is idling regardless of the operation position of the hand accelerator lever 23. The energization is restored until.

  A control device 28 that controls the electric motor 24 to operate forward and backward includes a limit switch 29 as a sensor that detects that the PTO clutch lever 20 has been operated to the “off” position, and a support shaft of the shift pedal 17. A limit switch 31 is connected as a sensor that detects that 30 is “neutral”.

  Then, as shown in the control flow chart of FIG. 5, it is detected that the PTO clutch lever 20 is not detected to be operated to the “off” position, or that the pedal shaft 30 is “neutral”. If any of the states is determined, the electric motor 24 holds the wire receiving member 26 in the “reference” position. That is, the speed adjusting mechanism 21 is in the accelerator set state corresponding to the operation position of the hand accelerator lever 23 when the PTO clutch 18 is engaged or at least one of the traveling states.

  Further, when it is determined that both the state where the PTO clutch lever 20 is operated to the “disengaged” position and the travel stop state where the pedal shaft 30 is “neutral” are detected, the electric motor 24 actuates the wire receiving member 26 to the "decelerate" position. That is, when it is determined that the driving of the mower 4 is stopped and the vehicle is stopped, the speed governing mechanism 21 is controlled to accelerator down to idling.

  After that, when the PTO clutch 18 is engaged or when the traveling is resumed, the wire receiving member 26 is returned to the “reference” position, and the speed adjusting mechanism 21 is controlled by the accelerator corresponding to the operation position of the hand accelerator lever 23. Return to the set state.

  The control device 28 is connected to a temperature sensor 32 for detecting the temperature of the engine cooling water and a notification device 33 such as a buzzer. When the detected water temperature is equal to or higher than a set value (for example, 130 ° C.), the notification device 33 is connected. Is operated and the engine 8 is informed of an overheating tendency, and when the detection state continues for a set time (for example, several seconds) or longer, the speed control mechanism 21 is connected via the electric motor 24. Thus, the accelerator 8 is controlled to idling, and the engine 8 is automatically cooled down.

  [Other Examples]

  (1) Since the wire receiving member 26 in the above-described embodiment only operates in two positions of the “reference” position and the “deceleration” position, an electromagnetic solenoid can be used instead of the electric motor 24.

  (2) In the above-described embodiment, the speed control lever 22 of the speed control mechanism 21 and the hand accelerator lever 23 are mechanically linked by the operation wire 25. However, the speed control lever 22 is an electric motor having a servo function. The operation position of the hand accelerator lever 23 is continuously detected by a potentiometer or the like, and the operation of the electric motor is controlled according to the operation position of the hand accelerator lever 23. If the detection condition is satisfied, the speed control mechanism 21 can be controlled to idle down to give priority to the accelerator set by the hand accelerator lever 23. In the case of this structure, it is possible to specify a dial type accelerator adjusting tool instead of the hand accelerator lever 23.

  (3) In the above embodiment, when the condition for the accelerator down control is satisfied, the electric motor 24 is operated to control the speed governing mechanism 21 to the idling set state. Although it is assumed that the original accelerator set state set by the accelerator lever 23 is restored, it is also possible to perform the accelerator down control by forcibly operating the hand accelerator lever 23 itself in the low speed direction by the electric motor 24. However, according to this structure, even if the accelerator down control condition is released, the hand accelerator lever 23 remains held at the idling position. Therefore, it is necessary to reset the accelerator with the hand accelerator lever 23 again.

  (4) As means for detecting the running stop state, in addition to detecting that the speed change operation tool is in the neutral position, for example, rotation of the axle can be detected by a rotation sensor.

  (5) The traveling transmission is not limited to a continuously variable transmission, but may be any form such as a mechanical continuously variable transmission, a ceremonial transmission, etc. A shift lever may be used.

Overall side view of riding mower Overall plan view of a riding mower Schematic diagram of transmission system Control block diagram Control flow diagram

Explanation of symbols

8 Engine 15 Continuously Variable Transmission 17 Shifting Operation Tool 18 PTO Clutch 21 Speed Control Mechanism 23 Accelerator Adjustment Tool

Claims (5)

In agricultural machines with a PTO clutch in the transmission system from the engine to the working device,
The engine speed-control mechanism is configured to be controllable, and the accelerator-down control is performed until the speed-control mechanism is in a predetermined idling set state based on detection of both the disengagement state and the travel stop state of the PTO clutch. An agricultural machine characterized by comprising means.   2. The agricultural working machine according to claim 1, wherein the control means is configured to perform accelerator-up control of the speed governing mechanism to a predetermined high-speed rotation set state in a state where neither the disengaged state of the PTO clutch nor the travel stop state is detected. .   The agricultural working machine according to claim 2, further comprising an accelerator adjuster for artificially adjusting and holding the high-speed rotation set state.   The traveling speed is changed by a continuously variable transmission capable of switching between forward and backward travel, and the shift operating tool for operating the continuously variable transmission is detected at the neutral position and recognized as the traveling stop state. The farm working machine according to any one of claims 1 to 3, wherein the control means is configured.   5. The control means according to claim 1, wherein the control means is configured to perform an accelerator down control until the speed control mechanism reaches a predetermined idling set state when a high temperature state higher than a setting of engine cooling water continues for a set time or longer. The agricultural machine according to any one of the above.

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