JPH109002A - Engine control operating device for work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure efficiency of work and safety by arranging a control switch for turning on/off interlocking of an engine control device on a work machine elevating operation member for operating vertical motion or the operating part of a forward/backward traveling switching operating member for switching the forward/backward propulsion direction of a vehicle. SOLUTION: A forward/backward traveling switching operating lever 4 is supported to a bracket 22 in a handle post, and the contact point of a forward switch 4F and a backward switch R is provided on the bracket 22. The control switch 2R of a momentary type for selecting turning-on/off of an engine control device is arranged on the top end part of the lever 4,. The control switch 2R is turned on/off so as to change the engine speed. A control switch 2S is arranged on the center part of a work machine elevating switch 3, and the control switch 2S is turned on/off so as to change the engine speed. It is thus possible to ensure efficiency of work and safety since turning-on/off operation of a control device matched with work state is carried out simply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of an engine control and operation device of a working vehicle for agriculture, construction, transportation and the like.

[0002]

2. Description of the Related Art Conventionally, there has been a work vehicle having an engine control device for lowering the engine speed in conjunction with a lifting / lowering operation of a work machine connected to the vehicle or a reverse operation of the vehicle. For example, in the tractor disclosed in Japanese Patent Application Laid-Open No. H8-21268, when the working device mounted on the rear of the vehicle body is raised prior to turning in the field work, the engine speed is reduced to a preset engine speed. An engine control is shown. Further, Japanese Patent Laid-Open Publication No. 3-15139 discloses an engine control device that lowers the engine speed when the vehicle is traveling backward as compared with when the vehicle is traveling forward.

[0003]

The work vehicle provided with the engine control device reduces the engine speed at the time of turning or reversing to prevent high-speed turning or high-speed reversing, thereby improving safety. There is a problem that the working efficiency is impaired if the running speed is reduced by lowering the engine speed depending on the working state or for a familiar operator. For example, a tractor having an engine control device that lowers the engine speed with the rise of the work machine prior to the above-mentioned field turn can always make a turn of a fixed radius in a large-area field where sorting is performed. If the engine speed is constantly reduced during turning in the state of, safe and efficient work can be performed. However, when working on a slope such as a field or orchard that has not been compartmentalized, depending on the location, it is necessary to randomly perform large-turn turning and small-turn turning, so that the control switch is always in the `` ON '' state, Since the number of revolutions of the engine is reduced, it takes a long time to make a large turn, resulting in inefficient work, or a problem that an engine stall occurs on an upward slope.
If the control switch is always set to "OFF", the engine speed does not decrease, and the vehicle turns at a high speed, thus impairing safety. For this reason, in order to achieve both work efficiency and safety, it is necessary to simultaneously perform the steering wheel operation during traveling, the lifting and lowering operation of the work equipment, and the on / off operation of the control device according to the situation,
When these operation units are separated from each other, each operation is very troublesome.

[0004]

The present invention employs the following technical means in order to solve the above problems. That is, an engine control device for lowering the engine speed in conjunction with a lifting / lowering operation of a work machine 1 connected to a vehicle or a reverse operation of the vehicle is provided, and a control switch 2 for turning on / off the interlocking of the control device is provided by the work machine An engine control operating device for a working vehicle, which is provided in an operating portion of a work implement elevating operation member 3 for operating a lifting device 1 or a forward / reverse switching operation member 4 for switching a forward / backward propulsion direction of a vehicle.

[0005]

In the engine control operating device for a work vehicle configured as described above, the control switch 2 for turning on and off the interlocking of the control device is provided by the work machine elevating operation member 3 for operating the work machine 1 up and down, or Since the operation unit of the forward / reverse switching operation member 4 for switching the forward / backward movement of the vehicle is provided, it is possible to operate the lifting / lowering operation of the work implement and the on / off operation of the control device according to the situation at substantially the same time when turning. Is possible,
Further, when the vehicle is moving backward, the on / off operation of the control device that matches the situation can be operated at substantially the same position at substantially the same time, so that the efficiency and safety of work can be secured.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The problems to be solved and means to be solved by the present invention are as described above, and an embodiment will be described for an agricultural tractor (hereinafter, tractor 10) as a working vehicle. Tractor 1
Reference numeral 0 designates a main portion by integrally connecting the clutch housing, the transmission case 12, the rear transmission case 13 and the like from the engine 11, and a pair of left and right front wheels 17 and 17 are provided at a front portion of the vehicle, and at a rear portion of the vehicle. Left and right pair of rear wheels 1
8.18 are provided. Then, the rotational power of the engine 11 in the hood 19 is transmitted to both the transmission cases 12 and 13.
Transmission and deceleration by the forward / reverse switching device and transmission in the rear wheel 1
8 and 18, and transmission to the front wheels 17 and 17. The injection pump 45 of the engine 11 is provided with an electronic governor device. The electronic governor device includes a rack actuator 47 for adjusting the position of the control rack 46 of the injection pump 45,
A rack position sensor 48 for detecting the position of the rack 46
And an engine rotation sensor 49 for detecting the number of revolutions of the engine 11 and the like, each of which is connected to a controller 50 to be described later. The rack actuator 47 expands and contracts due to energization from the controller 50 to adjust the position of the control rack 46, thereby increasing or decreasing the amount of fuel supplied to the engine 11 and increasing or decreasing the rotation speed of the engine 11.

A handle post 20 is provided behind the hood 19, and a handle 21 is provided above the handle post. By turning the handle 21, the front wheel 1 is moved.
It is configured to reciprocate 7.17. A forward / backward switching operation lever 4 as a forward / backward switching operation member is provided protrudingly below the handle 21 on the left side surface of the handle post 20. A cockpit 23 is provided behind the handle 21, and a lifting switch 3 as a work implement lifting / lowering operation member is provided beside the cockpit 23. Below the cockpit 23, a ROM storing a CPU and an engine control program and a RAM storing sensor information and the like are provided.
A controller 50 having the same is provided.

The forward / reverse switching lever 4 transmits the rotational power of the engine 11 to the main transmission in a forward direction.
Alternatively, it is a lever for manually selecting the transmission by reverse rotation by switching the gear in the forward / reverse switching device. The lever 4 is supported by a bracket 22 in the handle post 20, and the forward and backward operation positions of the bracket 22 are provided with contact points of a forward switch 4F and a reverse switch 4R, respectively. When the lever 4 is pushed forward, the forward switch 4F is turned on, and when the lever 4 is pulled backward, the reverse switch 4R is turned on. When the lever 4 is positioned substantially at the center of the forward and reverse positions, the switch is held at the neutral position and both switches are held. 4F and 4R are turned off. These ON signals are transmitted to the controller 50. Also,
At the tip of the lever 4, a momentary control switch 2R for selecting ON / OFF of the engine control device is provided. The control switch 2 at the end of the lever
When the lever 4 is turned to the reverse position in the state of "ON" by pressing R once, the engine control device is operated, the engine speed decreases to a predetermined speed at the time of reverse, and "OFF" without pressing the control switch 2R. When the lever 4 is turned to the reverse position in the state of FIG.
It is configured to maintain the number of rotations of 1. Note that the "ON" state of the control device may be "OFF" while the forward switch 4F is turned on, or the "ON" or "OFF" state is maintained until the control switch 2R is pressed again. Is also good.

As another form of the control switch 2R, the switch 5R is formed in a dial type so that the amount of decrease in the engine speed of the engine control device is "high", "medium",
You may be comprised so that it can be changed to a "small" and "0" stepped type.
This makes it possible to reduce the engine speed according to the situation. The work implement lifting switch 3 is a switch for selecting whether to lower the work implement 1 at the rear part to a work position or to raise the work implement 1 to a non-work position. At the base of the switch 3, a down switch 3D and an up switch 3U are provided. When the work machine elevating switch 3 is tilted forward, the descent switch 3D is turned on. When the work equipment elevating switch 3 is tilted backward, the ascending switch 3U is turned on, and this ON signal is transmitted to the controller 50. When the controller 50 receives the ON signals of the switches 3U and 3D, the controller 50 responds to the signals by turning on the signals.
A, the solenoid of the switching control valve 37B for lowering is energized to continuously raise and lower the working machine 1 between the non-working position or the working position. In addition, a control switch 3S for selecting ON / OFF of the engine control device is provided at a central portion of the work implement elevating switch 3. When the control switch 2S is pressed and the entire up / down switch 3 is pushed backward, the engine control device is turned on and the engine speed is reduced by a certain amount. When the switch 3 is pushed backward, the engine control device is turned off and the engine 1
The configuration is such that the number of rotations of 1 is the same as the number of rotations at the time of forward movement. The “ON” state of the control device may be set to “OFF” when the work machine descends, or the control switch 2S may be turned on again.
Until the key is pressed, the state of “ON” or “OFF” may be held.

A PTO shaft 32 is provided on the rear surface of the rear transmission case 13 so as to protrude therefrom, and a cylinder case 34 containing a main cylinder 35 for lifting and lowering the work machine is provided on the rear upper surface of the case 13.
The expansion and contraction of the piston of the lift arm 36
36 is rotated up and down. Hydraulic oil is supplied to or discharged from the piston of the main cylinder 35 into or from the main cylinder 35 by switching the oil passages of the ascending switching control valve 37A and the descending switching control valve 37B which are switched in response to the energization of the controller 50. It is configured to expand and contract. Further, a three-point link mechanism including a top link 30 and lower links 31 is provided at a rear portion of the rear transmission case 13, and the lift arms 36.3 are provided.
6 and the lower link 31 are lift rods 38.3 respectively
8 are connected. Thus, the working machine 3 mounted on the three-point link mechanism can be moved up and down via the three-point link mechanism by expansion and contraction of the piston of the main cylinder 35.

The working machine connected to the tractor 10 in the illustrated example is the rotary working machine 1, which is connected to the tractor 10 via the three-point link mechanism and performs tilling work while being towed. The rotational power of the PTO shaft 32 is:
The transmission is transmitted to the rotary working machine 1 via the transmission shaft 33 and transmitted to the rotating shaft 40 to which the rotating claws 41 are attached.

The tractor constructed as described above, for example, when performing tilling work on a rugged field or the like, when turning on a flat ground, as shown in FIG. When the work machine 1 is lifted by pushing the control switch 2S backward, the controller 50 executes the engine control device, so that low-speed turning and low-speed running are possible. In addition, when making a large turn on a flat ground, or when it is expected that engine stall will occur when the engine speed is lowered on an uphill slope, as shown in FIG. When a finger is scratched and pushed down at the tip of the work implement 1, the work implement 1 is lifted without executing the engine control device, so that quick turning and traveling can be performed.

As described above, since the control switch 2S for turning on and off the operation of the engine control device is provided at the front center of the work implement elevating switch 3, the handle operation of the tractor 10 and the work implement elevating operation according to the situation are performed. The on / off operation of the engine control device can be simultaneously operated with one hand, so that the complexity of providing these operation members at separate places is eliminated.

When a front loader (not shown) or the like is mounted on the tractor to carry or carry the earth and sand, and when the earth and sand are placed on the loader and the vehicle is moved backward under a work load, The control switch 2R provided on the forward / reverse switching operation lever 4 is pressed, and the lever 4 is pulled backward. Then, since the controller 50 executes the engine control device, the tractor 10 moves backward at a lower engine speed than during forward running, so that safe work can be performed. Further, when the vehicle is equipped with the loader and repeats forward / backward simply for traveling conversion or the like, it is pulled backward without pressing the control switch 2R of the forward / reverse switching lever 4R. Then, since the controller 50 does not execute the engine control device, the tractor 10 moves backward at the same engine speed as that during forward running, thereby enabling quick work traveling.

As described above, the control switch 2R for turning on / off the operation of the engine control device is provided at the tip of the forward / reverse switching lever 4, so that the tractor 10 can be operated in reverse with the steering operation. The on / off operation of the apparatus can be operated simultaneously with one hand, and the complexity of providing these operation members at separate locations can be eliminated.
Note that, in the claims, the reference numerals of the members corresponding to the configuration of the embodiment are attached, but the present invention is not limited to the configuration by the reference numerals.

[Brief description of the drawings]

FIG. 1 is a top view of a forward / reverse switching lever and a rotation base thereof.

FIG. 2 is a side cross-sectional view of a work machine elevating switch.

FIG. 3 is an overall view of a tractor.

FIG. 4 is a side view of the injection pump.

FIG. 5 is an operation diagram of a work implement elevating switch.

FIG. 6 is a block diagram of an engine control device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 control switch provided on rotary work machine 2R 4 control switch provided on 2S 3 3 work machine elevating switch 3U elevating switch 3D descent switch 4 forward / reverse switching operation lever 4F forward switch 4R reverse switch

Claims (1)

[Claims] 1. An engine control device for reducing an engine speed in conjunction with a lifting / lowering operation of a work implement 1 connected to a vehicle or a reverse operation of the vehicle, and a control switch 2 for turning on / off the interlocking of the control device. An engine control operating device for a working vehicle, wherein the operating unit is provided in an operating unit of a working machine lifting / lowering operating member 3 for operating the working machine 1 vertically or a forward / reverse switching operating member 4 for switching a forward / backward propulsion direction of a vehicle.