JP2000054865A - Mobile work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile work vehicle which can lower a device cost and also can be miniaturized and lightened by preventing the increase of the output of an internal combustion engine to the rated output at the time of traveling without operation, and resisting a mechanism and a member even though the strength of the mechanism and member forming a traveling power transmission system is not made so high. SOLUTION: In this mobile work vehicle in which the power of a mounted single internal combustion engine 50 is used for driving both a traveling device and a work device, the control input of an engine output adjusting member 56 adjusting the output of the internal combustion engine 50 according to operation of accelerator operating means can be operated to the maximum value H at the time of traveling with operation to travel while performing work, however, at the time of traveling without operation, the control input is operated only to an intermediate predetermined value M of not more than the maximum value H.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In the present invention, the power of a single mounted internal combustion engine is used both for traveling and for driving a working device such as a blower fan (for working). And self-propelled work vehicles such as speed sprayers.

[0002]

2. Description of the Related Art As a self-propelled work vehicle that performs operations such as spraying a chemical solution while traveling, there is a self-propelled work vehicle that extracts power for traveling and power for work such as a spraying of a chemical solution from a single engine. is there. FIG. 6 shows an example of a speed sprayer as such a self-propelled work vehicle. The illustrated speed sprayer 1 ′ has a pair of left and right front wheels 12, 12 disposed at a lower front side of a vehicle body 3 and a pair of left and right rear wheels 14, 14 at a lower rear side of the vehicle body 3 as a traveling device. A driver's seat 2 is disposed at the center of the front side of the vehicle body 3, a chemical solution tank 4 having a semicircular cross section is installed at the center, and an engine room 15 is provided immediately after the chemical solution tank 4.
A single diesel-type internal combustion engine 50 in the rear arrangement, which serves both for traveling, for driving the blower fan, and for driving auxiliary equipment such as the chemical liquid supply pump 11, is accommodated in the engine room 15. (For details, see, for example, Japanese Utility Model Publication No. 5-15975).

At the rear of the engine room 15, an axial blower fan 9 having an air outlet 7 is arranged as one of working devices, and a required number of chemical spray nozzles 6 are provided at the air outlet 7 so as to face the outside. Are arranged. In the vicinity of the driver's seat 2, a chemical liquid supply pump 11 for supplying a chemical liquid to the nozzle 6 by pressure is disposed, and the chemical liquid sprayed to the outside from the nozzle 6 is blown out from the air outlet 7 to the outside. It is diffused by the air flow from the blower fan 9,
The chemical solution can be sprayed while traveling while operating the steering handle 10 in an orchard or the like.

[0004]

As described above, the power of a single mounted internal combustion engine is used both for driving a traveling device and for driving a working device such as a blower fan (for working). In such a self-propelled work vehicle, when performing work such as spraying a chemical solution while traveling in a field or the like (during work traveling), the vehicle travels on a general road for movement (no work is performed). In case (when not working)
The required power of the internal combustion engine is different. That is,
When working while traveling, a considerably large output is required because the power of the internal combustion engine is used for both traveling and work, but when traveling only on the road, a relatively low output (rated (rated ( (Maximum) about 1/3 to 1/2 of the output).

However, in a conventional self-propelled work vehicle, an accelerator pedal (foot-operated type),
If an accelerator operating means such as an accelerator lever (manual type) is operated, the output of the internal combustion engine will rise to the rated output. Therefore, in a conventional self-propelled work vehicle, a traveling power transmission system such as a transmission is provided when the maximum output that can be output by the internal combustion engine is applied to the maximum, that is,
Even when all of the maximum output generated by the internal combustion engine is applied to the driving power transmission system, it is necessary to have strength capable of withstanding the load. Therefore, the mechanisms and members constituting the driving power transmission system are heavy and long. This has led to problems such as an increase in apparatus cost and an increase in size and weight.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems relating to the conventional self-propelled work vehicle, and an object of the present invention is to use a single mounted internal combustion engine for traveling. Under the condition that it can be used for both work and during non-working traveling, the output of the internal combustion engine is prevented from rising to the rated output, and the strength of the mechanism and members constituting the traveling power transmission system is greatly increased. It is an object of the present invention to provide a self-propelled work vehicle capable of withstanding without the need to reduce the cost of the apparatus and achieving downsizing and weight reduction.

[0007]

In order to achieve the above object, a chemical sprayer according to the present invention basically has a single internal combustion engine mounted on a vehicle for driving a traveling device. An operation amount of an engine output adjustment member that adjusts the output of the internal combustion engine according to the operation of an accelerator operation means is used for both driving of a work device, It is sometimes possible to operate up to the maximum value, but it is characterized in that it can be operated only up to an intermediate predetermined value equal to or less than the maximum value during non-working travel.

[0008] In a specific preferred aspect, an accelerator cable is provided for pulling the engine output adjusting member in accordance with the operation of the accelerator operation means.
The operation amount of the engine output adjustment member pulled by the accelerator cable does not become the maximum value, and during the work traveling, the operation amount of the engine output adjustment member is increased to the maximum value according to the operation of the accelerator operation means. Can be changed.

In a more specific preferred embodiment, there is provided a cable operating means for pushing up or pulling up an intermediate portion of the accelerator cable during the work traveling. The cable operating means is not particularly limited, and may be a solenoid-type actuator that is operated in conjunction with a work starting operation means such as a clutch lever for a blower, or may be rotated through an interlocking member by the work starting operation means. A lever member or the like can be used.

In a preferred aspect of the self-propelled work vehicle according to the present invention having the above-described configuration, the operation amount of the engine output adjustment member is controlled in accordance with the operation of the accelerator operation means during the work traveling. In this case, the output of the internal combustion engine can be increased to the rated (maximum) output, while the accelerator operating means operates to the maximum value during the non-working traveling. Even so, the operation amount of the engine output adjustment member pulled by the accelerator cable does not become the maximum value, and therefore, the output of the internal combustion engine is limited to an output range smaller than the rated (maximum) output.

As described above, since the output of the internal combustion engine is automatically limited during the non-working traveling, the mechanism and members constituting the traveling power transmission system are controlled when the output of the internal combustion engine is maximum. Is not required to be strong enough to withstand
The size and weight can be reduced, and furthermore, the reduction of damage to each mechanism and member, the extension of life, and the like can be achieved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an appearance of a front half of an embodiment of a speed sprayer as a self-propelled work vehicle according to the present invention. The speed sprayer 1 of the illustrated embodiment has basically the same configuration as the speed sprayer 1 ′ shown in FIG.
Parts corresponding to the respective parts of the speed sprayer 1 ′ shown in FIG. 6 and the same functional parts are denoted by the same reference numerals, and redundant description thereof will be omitted. Hereinafter, an accelerator operation system which is a characteristic part of the present invention will be described. Will be explained with emphasis. A driver's seat 2 and a steering handle 10 are provided at the front of the speed sprayer 1 in the illustrated embodiment, and an accelerator pedal 21 and an accelerator lever 23 as an accelerator operation member, and a blower clutch lever 27 as an operation start operation means. Is provided.

The accelerator pedal 21 and the accelerator lever 23 (hereinafter, referred to as accelerator operation members 21 and 23) are connected to a swing stay 25 via individual accelerator cables 22 and 24 made of Bowden cables, respectively. One end of a common accelerator cable 30 is connected to the swing stay 25, and the accelerator pedal 2
By operating (either stepping on or rotating by hand) one of the accelerator lever 1 and the accelerator lever 23, the swing stay 25 is rotated and the accelerator cable 30 is rotated.
Is to be pulled.

The accelerator cable 30 is composed of a Bowden cable, is routed from the front to the rear of the vehicle body 3, and has a single end mounted at the other end as shown in FIG. Fuel injection pump 55 as an engine output adjusting member attached to diesel engine 50
Are connected to the fuel adjustment lever 56 of the first embodiment. The fuel injection pump 55 supplies a fuel injection nozzle (not shown) provided in each cylinder (for example, four cylinders) of the engine 50 with an amount of fuel corresponding to the rotation position (angle) of the fuel adjustment lever 56. ). The power of the engine 50 is used both for driving the wheels 12 and 14 as a traveling device and for driving (working) the blower fan 9 and accessories as working devices. The output can be changed by pulling and rotating the fuel adjustment lever 56 with the accelerator cable 30. The fuel adjustment lever 5 in FIG.
The rotation position 6 indicates the minimum output time S (idling).

In the middle of the accelerator cable 30, there is formed a tension increasing portion 30a in which an inner cable portion of the Bowden cable is exposed.
Fixed rollers 75 and 76 are disposed at a predetermined interval above the tension increasing portion 30a, and a solenoid type actuator 70 as a cable operating means is disposed below the fixed rollers 75 and 76 between the fixed rollers 75 and 76. Are arranged. As shown in FIG. 5, the solenoid-type actuator 70 is turned on / off in conjunction with a blower clutch lever 27 as the work start operating means for controlling a blower clutch (not shown) via an interlocking rod 90. The power supply is excited via a switch 91. When the power supply is excited, the plunger 7 is turned on.
The push-up roller 73 provided at the tip of the accelerator pedal 21 and the accelerator lever 2
The accelerator cable 30 is further pushed up and pulled from the state where the operation amount of No. 3 is the maximum value force.

On both sides of the increased tension portion 30a of the accelerator cable 30, the end of the outer tube 32 located on the accelerator pedal 21 side is
The fuel adjusting lever 5 is fixed to a fixing wall 39 of the body by a fixing screw member 34 and lock nuts 37, 37.
An end of the outer tube 42 located on the sixth side is fixed to a fixing wall 49 of the body by a fixing screw member 44 and lock nuts 47, 47.

In the vicinity of the fixing screw member 34 in the accelerator cable 30, the accelerator operating member 2
A high-speed stopper piece 35 that abuts when 1, 23 is operated to the maximum value h is mounted and fixed, and the operation amount of the accelerator operation members 21, 23 is located near the fixing screw member 34 in the accelerator cable 30. When the minimum value S is reached, the low-speed side stopper piece 66 which comes into contact with the low-speed stopper piece 66 is mounted and fixed. The stopper pieces 35 and 66 are not always necessary, and can absorb mounting errors of each part,
The fuel adjusting lever 56 is provided to suppress undesired behavior.

The low-speed side stopper 66 is connected to one end of a substantially V-shaped control arm 60 whose central portion is pivotally supported by a pin 61. The other end of the control arm 60 is A tension coil spring 63 for urging the fuel adjustment lever 56 in the minimum output direction is connected to the control arm 60 always in a counterclockwise direction, in other words, via the low speed side stopper 66 and the accelerator cable 30. Have been. The fixed wall 49 includes a low-speed stopper bolt 4 that regulates the rotation position of the control arm 60 when the accelerator cable 30 is pulled in the minimum output direction.
5, and a high-speed stopper bolt 46 that regulates the rotational position of the control arm 60 when the accelerator cable 30 is pulled in the direction of maximum output.

In the speed sprayer 1 according to the present embodiment having such a configuration, the accelerator operating member 2
At the time of non-operation and non-running, when the clutch levers 1 and 23 and the blower clutch lever 27 are not engaged and are not operated, the fuel adjustment lever 56 assumes the minimum output position S as shown in FIG. Also, during non-operation traveling, as shown in FIG. 3, even if the accelerator operation members 21 and 23 are operated to the maximum value h, the operation amount (time) of the fuel adjustment lever 56 pulled by the accelerator cable 30 is increased. Moving angle)
It does not reach the maximum value H but stays below the intermediate predetermined value M. Therefore, the output of the internal combustion engine 50 is limited to an output smaller than the rated (maximum) output.

On the other hand, at the time of work traveling while traveling, as shown in FIG. 4, the clutch lever 27 for the blower is operated, and the switch 91 is turned on in conjunction therewith, so that the solenoid type actuator is operated. 70 is energized and excited, and the push-up roller 73 provided at the tip of the plunger 71 is made to protrude upward, whereby the accelerator cable 30 is further pushed up. Therefore, during the work traveling, the operation amount (rotation angle) of the fuel adjustment lever 56 can be operated up to the maximum value H in accordance with the operation of the accelerator operation members 21 and 23. Can increase the output of the internal combustion engine 50 to a maximum value.

As described above, the output of the internal combustion engine is automatically limited during non-working traveling, so that the mechanism and members constituting the traveling power transmission system exhibit the maximum output of the internal combustion engine. Since it is no longer required to have strength enough to withstand when the device is in operation, the cost of the device can be reduced, and the size and weight can be reduced.
Further, it is possible to reduce the damage of each mechanism / member and prolong the service life. As described above, one embodiment of the present invention has been described in detail. However, the present invention is not limited to the above-described embodiment, and various designs may be made without departing from the spirit of the invention described in the claims. Can be changed.

For example, as the cable operating means,
Instead of the solenoid actuator 70, for example, as shown in FIG. 5, a lever member 80 which is rotated via an interlock rod 69 by the blower clutch lever 27 constituting the operation start operation means is provided. It can also be used. That is, the fixed roller 75,
The lever member 80 is pivotally supported by a pin 83 at the lower side between 76, and the lever member 80 is rotated by being pulled by the clutch lever 27 for the blower via the interlocking rod 69, and provided at the tip thereof. The pulled up roller 82 may push up the tension increasing portion 30a of the accelerator cable 30.

The engine output adjusting member for adjusting the output of the internal combustion engine according to the operation of the accelerator operating means is not limited to the fuel adjusting lever 56.
When the internal combustion engine is a two-cycle or four-cycle gasoline engine other than a diesel engine, a throttle valve can be used as the engine output adjusting member. Further, as means for operating the engine output adjusting member, in addition to the accelerator cable 30, electric operating means, hydraulic means and the like can be used.

[0024]

As will be understood from the above description, in the self-propelled work vehicle according to the present invention, the operation amount of the engine output adjustment member is set to the maximum value in accordance with the operation of the accelerator operation means during work traveling. In this case, the output of the internal combustion engine can be operated up to the rated (maximum) output. On the other hand, during non-working traveling, even if the accelerator operating means is operated up to the maximum value, The operation amount of the engine output adjusting member pulled by the accelerator cable does not become the maximum value, and therefore, the output of the internal combustion engine is limited to an output smaller than the rated (maximum) output. The mechanisms and members constituting the system are not required to be strong enough to withstand the maximum output of the internal combustion engine, and as a result, the cost of the apparatus can be reduced. Both compact, it is possible to reduce the weight and the like, and further, damage reduction of the mechanisms and members, it is possible to achieve even longer life and the like.

[Brief description of the drawings]

FIG. 1 is an external view showing a front half of an embodiment of a speed sprayer as a self-propelled work vehicle according to the present invention.

FIG. 2 is a diagram showing a schematic configuration of an accelerator operation system of the speed sprayer shown in FIG.

FIG. 3 is a diagram which is used for explaining the operation of an accelerator operation system when the speed sprayer shown in FIG. 1 is not traveling.

FIG. 4 is a diagram for explaining the operation of an accelerator operation system when the speed sprayer shown in FIG. 1 is traveling.

FIG. 5 is a schematic configuration diagram showing another example of a cable operating means provided in an accelerator operation system of the speed sprayer shown in FIG.

FIG. 6 is an external view showing an example of a speed sprayer as a conventional self-propelled work vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Speed sprayer (chemical spraying vehicle) 21 ... Accelerator pedal (accelerator operation means) 23 ... Accelerator lever (accelerator operation means) 27 ... Clutch lever for blower (operation start operation means) 30 ... Accel cable 50 ... Diesel engine (internal combustion) Engine ... 56 ... Fuel adjustment lever (engine output adjustment member) 69 ... Interlocking member 70 ... Solenoid type actuator (Cable operation means) 80 ... Lever member (Cable operation means) H (h) ... Maximum value M ... Intermediate predetermined value

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G065 AA01 BA04 CA00 DA03 DA07 GA46 JA10 JA17 KA05 KA32 KA33 3G093 AA09 AB01 DA06 EA05 EA09 EC01 EC03 4D074 AA05 BB06 CC04 CC13

Claims (5)

[Claims] 1. A single internal combustion engine (5)
In the self-propelled work vehicle in which the power of 0) is used for driving both the traveling device (12, 14) and the work device (9), the accelerator operating means (21, 23) The amount of operation of the engine output adjusting member (56) for adjusting the output of the internal combustion engine (50) in response to the operation of (1) can be operated to the maximum value (H) during work traveling while performing work. However, the self-propelled work vehicle is characterized in that it can be operated only up to an intermediate predetermined value (M) which is equal to or less than the maximum value (H) during non-working travel. 2. An accelerator cable (30) for pulling the engine output adjusting member (56) in accordance with the operation of the accelerator operation means (21, 23), and the accelerator operation means (21, 23) is operated to the maximum value (h), the accelerator cable (3)
0) The engine power adjusting member (56) pulled on
Does not become the maximum value (H), and the operation amount of the engine output adjustment member (56) becomes the maximum value (H) in response to the operation of the accelerator operation means (21, 23) during the work traveling. The self-propelled work vehicle according to claim 1, wherein the self-propelled work vehicle is adapted to be changed to H). 3. The self-propelled vehicle according to claim 2, further comprising cable operating means (70, 80) for pushing up or pulling up an intermediate portion of the accelerator cable (30) during the work traveling. Work vehicle. 4. The self-propelled work vehicle according to claim 3, wherein said cable operation means is a solenoid actuator (70) which is operated in conjunction with a work start operation means (27). . 5. The cable operating means according to claim 3, wherein said cable operating means is a lever member (80) which is rotated by said work starting operating means (27) via an interlocking member (69). Self-propelled work vehicle.