JP5402554B2 - Working machine - Google Patents

Description

  The present invention relates to a working machine having a leveling device such as a seedling transplanter.

In with the seedling planting unit with float working machine (sometimes referred to seedling transplantation machine), allowed to increase the seedling planting unit which connects to the aft body of the working machine when the working machine is retracted There is a need. At this time, a working machine having a configuration for automatically raising the seedling planting unit is well known, but the engine rotates at a low speed in order to cause the working machine to run at a low speed when retreating.
However, since the rotational speed of the hydraulic pump is also in the low speed rotation region due to the low speed rotation of the engine, the operating speed of the hydraulic cylinder that operates the seedling planting part is relatively slow due to the small amount of oil discharged from the hydraulic pump. For example, the seedling planting part may come into contact with the cocoon at the shore. In view of this, there has been proposed a working machine in which the engine is rotated at a high speed so that the seedling planting portion does not come into contact with the cocoon when the working machine (seedling transplanting machine) moves backward.

JP-A-7-123817

  In the seedling transplanter disclosed in Patent Document 1, when the engine is rotated at a high speed when the seedling transplanter is retracted, the retracting speed of the seedling transplanter may be faster than expected by the operator.

  Accordingly, an object of the present invention is to provide a seedling transplanting machine in which the seedling transplanting unit does not come into contact with the cocoon or the like when the seedling transplanting machine is retracted, and at the same time, the retracting speed of the seedling transplanting machine is not excessively increased. .

The above-mentioned problem of the present invention is solved by the following means.
According to the first aspect of the present invention, an engine (20), traveling wheels (11), a steering handle (34), an accelerator pedal (39) for adjusting a fuel ejection amount of the engine (20), an engine, A hydraulic continuously variable transmission means (23) for inputting power from (20) and continuously shifting the rotational speed from the engine (20) to transmit to the traveling wheels (11); and the hydraulic continuously variable A transmission comprising mechanical transmission means for shifting to a stepped gear stage provided at the rear stage of the transmission means (23), and a manual main transmission lever for changing the shift position of the hydraulic continuously variable transmission means (23) (16) and a seedling planting section having a manual auxiliary transmission lever (17) for changing the transmission position of the mechanical transmission means, and further having a float (55, 56) in contact with the farm scene at the rear of the machine body In the working machine with (4), the transmission is in front The engine speed when the transmission is in the reverse neutral position is set larger than the engine speed when the transmission is in the neutral position, and the engine speed when the transmission is in the first gear position in the reverse direction is set to Set the engine speed smaller than the engine speed when the transmission is in the neutral position on the reverse side, and set the maximum engine speed at the traveling speed (planting speed) when planting seedlings set by the mechanical transmission, The working machine is provided with a control device (163) having a control configuration that is increased in the power mode in which power is given priority and reduced in the eco mode in which fuel is given priority .

The invention according to claim 2 includes an engine (20), traveling wheels (11), a steering handle (34), an accelerator pedal (39) for adjusting a fuel injection amount of the engine (20), an engine, A hydraulic continuously variable transmission means (23) for inputting power from (20) and continuously shifting the rotational speed from the engine (20) to transmit to the traveling wheels (11); and the hydraulic continuously variable A transmission comprising mechanical transmission means for shifting to a stepped gear stage provided at the rear stage of the transmission means (23), and a manual main transmission lever for changing the shift position of the hydraulic continuously variable transmission means (23) (16) and a seedling planting section having a manual auxiliary transmission lever (17) for changing the transmission position of the mechanical transmission means, and further having a float (55, 56) in contact with the farm scene at the rear of the machine body In the working machine provided with (4), the handle (3 ), The steering wheel turning angle sensor (33) for detecting the turning angle is provided, and the engine speed when the transmission is in the neutral position on the reverse side is larger than the engine speed when the transmission is in the neutral position on the forward side. The engine speed when the transmission is in the first gear position in the reverse direction is set smaller than the engine speed when the transmission is in the neutral position on the reverse side, and is set by the mechanical transmission. Seedling planting at the start of turning detected by the steering wheel turning angle sensor (33) when a power mode is set in which the highest engine speed at the driving speed (planting speed) at the time of planting is set. to initiate an increase in the biasing unit (4), braking that in conjunction with the increase in the seedling planting unit (4) having a control structure for changing the eco mode to fuel consumption priority engine speed from the power mode Is a work machine you characterized in that device (163) is provided.

According to a third aspect of the present invention, a center float sensor (169) for detecting that the center float (55) is grounded is provided, and the control device (163) determines that the fuel efficiency is prioritized from the power mode in which the engine speed is the power priority. When the center float sensor (169) detects that the center float (55) is grounded after changing to the eco mode, the engine speed is changed from the eco mode to the power mode. A working machine according to claim 2 .

The invention described in claim 4 is provided with a seedling planting clutch in the seedling planting section (4), and the control device (163) is a seedling planting section (4) at the start of turning detected by the handle turning angle sensor (33). After the engine speed is changed from the power mode to the eco mode in conjunction with the rise of the seedling planting part (4), the engine speed is again set to the power mode when the seedling planting clutch is engaged. 4. The work machine according to claim 2 , wherein the work machine has a control configuration to be changed .

The invention according to claim 5 includes an engine (20), a traveling wheel (11), a steering handle (34), an accelerator pedal (39) for adjusting a fuel injection amount of the engine (20), and an engine. A hydraulic continuously variable transmission means (23) for inputting power from (20) and continuously shifting the rotational speed from the engine (20) to transmit to the traveling wheels (11); and the hydraulic continuously variable A transmission comprising mechanical transmission means for shifting to a stepped gear stage provided at the rear stage of the transmission means (23), and a manual main transmission lever for changing the shift position of the hydraulic continuously variable transmission means (23) (16) and a seedling planting section having a manual auxiliary transmission lever (17) for changing the transmission position of the mechanical transmission means, and further having a float (55, 56) in contact with the farm scene at the rear of the machine body In the working machine with (4), the transmission is in front The engine speed when the transmission is in the reverse neutral position is set larger than the engine speed when the transmission is in the neutral position, and the engine speed when the transmission is in the first gear position in the reverse direction is set to The speed is set to be smaller than the engine speed when the transmission is at the neutral position on the reverse side, and the shift position of the hydraulic continuously variable transmission means (23) by the main shift lever (16) is set to 2 of the full shift speed within a predetermined time. when moving to a separatory one or deceleration side of a control unit (163) work machine you characterized in that a having a control arrangement for stopping part of the fuel supply to the engine (20).

According to a sixth aspect of the present invention, the control device (163) is configured such that the engine speed and the traveling speed (planting speed) at the time of planting of the seedling are set at the traveling speed (moving speed) during road traveling set by the mechanical transmission. 6. The work machine according to claim 1, wherein the work machine has a control configuration for changing the engine speed in each gear position .

According to the seventh aspect of the present invention, the control device (163) prevents the engine speed at the traveling speed (moving speed) when traveling on the road set by the mechanical transmission from exceeding a speed reference for a small special vehicle. The work machine according to any one of claims 1 to 6, wherein the work implement has a control configuration.

According to an eighth aspect of the present invention, the control device (163) is an accelerator pedal that adjusts the fuel ejection amount of the engine (20) for each shift position of the hydraulic continuously variable transmission means (23) by the main shift lever (16). The work machine according to any one of claims 1 to 7, further comprising a control configuration that provides an upper limit value of the engine speed at the time of maximum depression (39).

According to the invention described in claim 1, when the seedling transplanting machine is moved backward while raising the seedling planting part ( 4 ) , the seedling planting part is quickly raised by increasing the engine speed before starting the reverse movement, If the engine speed is reduced when the reverse starts, the driver will not move backward at a higher speed than expected, so that the safety of the driver can be improved.
In addition, by operating in the power mode in wet fields, for example, operating in the power mode by reducing the maximum engine speed at the traveling speed (planting speed) at the time of seedling planting in the eco mode that prioritizes fuel consumption. Then, the fuel consumption can be improved by operating in the eco mode.

According to the invention of claim 2, when the seedling transplanter is moved backward while raising the seedling planting part (4), the engine seedling planting part is quickly raised by increasing the engine speed before starting the reverse, If the engine speed is reduced when the reverse starts, the driver will not move backward at a higher speed than expected, so that the safety of the driver can be improved.
In addition, if turning starts when the engine is rotating in the power-priority power mode, the seedling planting part (4) is raised in the power-priority power mode and interlocked with the raising of the seedling planting part (4) (For example, when the increase is completed), the engine speed is decreased by switching from the power mode to the eco-mode with priority on fuel consumption. When the engine speed decreases, the vehicle speed decreases, so that the work implement can turn smoothly .

According to the invention described in claim 3, in addition to the effect of the invention described in claim 2, when it is detected that the seedling planting portion (4) is lowered and the float (55) is grounded at the end of turning, the engine is detected. because to change the rotational speed from the eco mode to the power mode Ru performed without planting the running of seedlings problem even in Shitsuden.

According to invention of Claim 4, in addition to the effect of the invention of Claim 2 or Claim 3, when the seedling planting clutch provided in the seedling planting part (4) is engaged at the end of turning, the seedling planting clutch again by changing the engine speed to power mode, Ru can be performed without planting the running of seedlings problem even in Shitsuden.

According to the invention described in claim 5, when the seedling transplanting machine is moved backward while raising the seedling planting part (4), the engine seedling planting part is quickly raised by increasing the engine speed before starting the reverse movement, If the engine speed is reduced when the reverse starts, the driver will not move backward at a higher speed than expected, so that the safety of the driver can be improved.
In addition, when the engine speed is high (when the governor is wide open), even if the engine is suddenly decelerated, the engine (20) is partially cut off so that it can be decelerated abruptly. It can not Rukoto lower the engine speed.

According to the sixth aspect of the present invention, in addition to the effect of the invention as claimed in any one of claims 5, the engine speed in the running speed during road (moving speed) and the seedling planting By changing the engine speed for each shift speed at the driving speed (planting speed) at the time of attachment, the driving feeling can be changed between "planting speed" and "moving speed" even at the same speed stage, Ru can be improved compared to steering performance of the working machine in the prior art.

According to the invention of claim 7, wherein,請 Motomeko in addition to the effect of the invention according to any one of claims 1 to 6, the engine rotational speed is small special in the running speed during road (moving speed) the variation of each aircraft of the working machine by setting so as not to exceed the speed reference for the motor vehicle, Ru can so as not to travel speed is too fast.

According to the invention described in claim 8, in addition to the effect of the invention described in any one of claims 1 to 7, the shift position of the hydraulic continuously variable transmission means ( 23 ) by the shift lever ( 16 ). By setting the upper limit of the engine speed when the accelerator pedal ( 39 ) is fully depressed, which adjusts the fuel injection amount of the engine ( 20 ) every time, the injection amount of the engine does not increase more than necessary, and there is an effect of improving fuel consumption. In addition, even if the accelerator pedal ( 39 ) is fully depressed, the engine speed does not increase more than necessary. Therefore, it is possible to control the accelerator pedal ( 39 ) while fully depressing without fine adjustment of the accelerator pedal ( 39 ). It becomes .

It is a side view of the riding type rice transplanter of the Example of this invention. It is a top view of the riding type rice transplanter of FIG. It is a principal part side view of the seedling planting part of the riding type rice transplanter of FIG. It is a principal part rear view of the support structure of the seedling mounting stand of the riding type rice transplanter of FIG. It is a principal part top view of the seedling planting part of the riding type rice transplanter of FIG. It is an enlarged view centering on the power transmission system to the rotor of FIG. It is a partial block diagram of the control apparatus of the riding type rice transplanter of FIG. It is a partial block diagram of the control apparatus of the riding type rice transplanter of FIG. It is a figure which shows the change of the engine speed with respect to 9 steps of forwards and 6 steps of reverses of the riding type rice transplanter of FIG. It is a figure which shows the change of the speed with respect to 9 steps of forwards and 6 steps of reverses of the riding type rice transplanter of FIG. It is a figure which shows the view of the turning interlocking control of the riding type rice transplanter of FIG. It is a flowchart of the turning interlocking control of FIG. It is a flowchart which cuts part of fuel supply to an engine, when performing the rapid deceleration of the riding type rice transplanter of FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 and FIG. 2 are a side view and a plan view of a riding type rice transplanter equipped with a fertilizer application device as a granular material feeding device which is a typical example of the seedling transplanter of the present invention. In this riding type rice transplanter 1 with a fertilizer application, a seedling planting portion 4 is mounted on the rear side of the traveling vehicle body 2 via an elevating link device 3 so that the seedling planting portion 4 can be moved up and down. Is provided.
In this specification, the boarding operator refers to the left and right directions in the forward direction of the seedling transplanter as left and right, respectively, and the forward and backward directions are referred to as forward and backward, respectively.

  The traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 10 and 10 and a pair of left and right rear wheels 11 and 11 as drive wheels, and a transmission case 12 is disposed at the front of the fuselage. Front wheel final cases 13, 13 are provided on the left and right sides of the case 12, and the left and right front wheels are mounted on the left and right front wheel axles projecting outward from the respective front wheel support portions capable of changing the steering direction of the left and right front wheel final cases 13, 13. 10 and 10 are respectively attached. Further, the front end portion of the main frame 15 is fixed to the rear portion of the transmission case 12, and a rear wheel gear case 18, with a rear wheel rolling shaft provided horizontally in the front and rear sides at the rear left and right center of the main frame 15 as a fulcrum. The rear wheels 11 and 11 are attached to a rear wheel axle that is supported in a freely rolling manner and projects outwardly from the rear wheel gear cases 18 and 18.

  The engine 20 is mounted on the main frame 15, and the rotational power of the engine 20 is transmitted to the transmission case 12 via a belt transmission device 21 and a hydraulic continuously variable transmission (HST) 23. The rotational power transmitted to the mission case 12 is shifted by a transmission comprising a gear type transmission including a sub-transmission device (not shown) in the case 12, and then separated into traveling power and external extraction power. A part of the traveling power is transmitted to the front wheel final cases 13 and 13 to drive the front wheels 10 and 10, and the rest is transmitted to the rear wheel gear cases 18 and 18 to drive the rear wheels 11 and 11. Further, the external take-out power is transmitted to a planting clutch case 25 provided at the rear part of the traveling vehicle body 2, and then transmitted to the seedling planting unit 4 by the planting transmission shaft 26, and also the fertilizer application device 5 by the fertilization transmission mechanism 28. Is transmitted to.

Note that by operating the main shift lever 16, the HST 23 can shift continuously (steplessly) from the 9th forward speed through the neutral position to the 6th reverse speed shown in FIG. 10, but the control device 163 of this embodiment is operated. The engine speed is changed stepwise so that the user can perceive the speed change during the shifting operation stepwise.
Further, by operating the auxiliary transmission lever 17, the gear stage can be changed stepwise by changing the meshing of a plurality of gears of a known auxiliary transmission in a gear transmission (not shown).

  The upper part of the engine 20 is covered with an engine cover 30, and a seat 31 is installed thereon. A front cover 32 incorporating various operation mechanisms is provided in front of the seat 31, and a handle 34 for steering the front wheels 10 and 10 is provided above the front cover 32. The engine cover 30 and the front cover 32 have horizontal floor steps 35 on the left and right sides of the lower end. The floor step 35 is partly grid-shaped (see FIG. 2), and mud on the shoe of the worker walking through the step 35 falls on the field. The rear part on the floor step 35 is a rear step 36 that also serves as a rear wheel fender.

  Further, on both the left and right sides of the front part of the traveling vehicle body 2, the spare seedling platforms 38, 38 on which the replenishment seedlings are placed can be pivoted to a position projecting laterally from the machine body and a position housed inside. The spare seedling stage 38 on one side is provided in three stages with inclined support members.

  The elevating link device 3 has a parallel link configuration, and includes one upper link 40 and a pair of left and right lower links 41, 41. These links 40, 41, 41 are pivotally attached to a rear-view portal-shaped link base frame 42 erected on the rear end of the main frame 15, and a vertical link 43 is connected to the tip side thereof. ing. And the connecting shaft 44 rotatably supported by the seedling planting part 4 is inserted and connected to the lower end part of the vertical link 43, and the seedling planting part 4 is connected so as to be able to roll around the connecting shaft 44. An elevating hydraulic cylinder 46 operated by an electromagnetic hydraulic valve 161 (FIG. 8) is provided between a support member fixed to the main frame 15 and a tip of a swing arm (not shown) integrally formed with the upper link 40. The upper link 40 is rotated up and down by expanding and contracting the cylinder 46 by hydraulic pressure, and the seedling planting portion 4 is lifted and lowered with a substantially constant posture.

  The seedling planting section 4 has a six-row planting structure, a transmission case 50 that also serves as a frame, a mat seedling, and a left and right reciprocating motion to supply seedlings to the seedling outlet 51a of each row one by one. When all the seedlings are supplied to the seedling outlet 51a, the seedling feed belt 51b is used to transfer the seedlings downward by a seedling feeding belt 51b, and the seedling planting is carried out in the field. Attaching device 52,..., A pair of left and right drawing markers 24 (shown only in FIG. 2) and the like for drawing the aircraft path in the next stroke to the topsoil surface are provided.

  In the lower part of the seedling planting part 4, a center float 55 is provided in the center, and side floats 56, 56 are provided on the left and right sides thereof. When the aircraft is advanced with these floats 55, 56, 56 in contact with the mud surface of the field, the floats 55, 56, 56 slide while leveling the mud surface, and the seedling planting device 52, Seedlings are planted by ... Each of the floats 55, 56, and 56 is rotatably mounted so that the front end side moves up and down in accordance with the unevenness of the field topsoil surface, and the vertical movement of the front part of the center float 55 is an angle-of-attack control sensor during planting work. The planting depth of the seedling is always kept constant by switching the hydraulic valve 161 that controls the lifting hydraulic cylinder 46 according to the detection result to raise and lower the seedling planting unit 4. To do.

  The fertilizer application device 5 feeds the granular fertilizer stored in the fertilizer hopper 60 by a fixed amount by the feeding portions 61,. Guided to a guide (not shown),..., And dropped into a fertilization structure formed near the side of the seedling planting line by a grooved body 160 provided on the front side of the fertilization guide. Air generated by the blower 58 driven by the blower electric motor 53 is blown into the fertilizer hose 62 through the air chamber 59 that is long in the left-right direction, and the fertilizer in the fertilizer hose 62 is forced by the wind pressure. It is designed to be transported.

  The seedling planting unit 4 is provided with a rotor 27 (an example of the first leveling rotor 27a that is a side leveling rotor and a second rotor 27b that is a central leveling rotor) that is an example of a leveling device. In addition, the seedling mount 51 is configured to slide in the left-right direction using a support roller 65a of a rectangular support frame 65 having a full width in the left-right direction and the vertical direction that supports the entire seedling planting unit 4 as a rail.

  The side view of FIG. 3 and the rear view of FIG. 4 show the main part of the rotor support structure, FIG. 5 shows the main part plan view of the rotor 27, the floats 55 and 56, and the seedling planting device 52 part. The enlarged view centering on the power transmission system to the rotor 27 of FIG. 5 is shown.

  The rotor support structure includes a beam member 66 whose upper ends are rotatably supported on both side members 65b of the support frame 65 of the seedling stage 51, a support arm 67 fixed to both ends of the beam member 66, and the support. A rotor support frame 68 that is rotatably attached to the arm 67 is provided. A drive shaft 70 (70a, 70b) of the rotor 27 (27a, 27b) is attached to the lower end of the rotor support frame 68. Further, the lower end portion of the rotor support frame 68 is connected to a connecting member 71 rotatably attached to the transmission case 50.

  As shown in FIG. 5, the second rotor 27 b in front of the center float 55 is disposed in front of the first rotor 27 a in front of the side float 56 due to the arrangement position with the floats 55 and 56. Therefore, power is transmitted from the gear in the gear case 18 of the rear wheel 11 to the first drive shaft 70a that drives the left first rotor 27a via the universal joint 72, and further to the inner end of the first drive shaft 70a. Power is transmitted from a provided bevel gear (not shown) to a first transmission shaft (not shown) that has a bevel gear meshing with the bevel gear at the end and is disposed in the left transmission shaft case 73. Power is transmitted from the transmission shaft to the second drive shaft 70b to which the second rotor 27b is fixed via the bevel gear. Power is transmitted to a second transmission shaft (not shown) disposed in the right transmission shaft case 73 via a bevel gear provided at the right end of the second drive shaft 70b, and the bevel gear is transferred from the second transmission shaft. Power is transmitted to the first drive shaft 70a to which the right first rotor 27a is fixed.

  As shown in FIG. 5, the left and right first rotors 27a, 27a and the central second rotor 27b are arranged so as to be displaced from each other in the front-rear direction, and the front-rear direction between the first rotors 27a, 27a and the central second rotor 27b. A transmission shaft case 73, 73 having a pair of transmission shafts each including a first transmission shaft and a second transmission shaft extending inside is disposed, and the transmission shaft cases 73, 73 are disposed so as to be inclined forward and backward in plan view of the body. ing. It is comprised so that the space | interval of the mutual front side of a pair of transmission shaft cases 73 and 73 may become smaller than the space | interval of a rear side by plane view of an airframe.

  A rotor transmission case 19 (FIG. 5) including a rotor transmission (not shown) provided with a mechanism for shifting the power transmitted from the rear wheel drive gear case 18 in two stages and outputting it to the rotor 27 is provided. Thus, the rotor speed change device enables the rotation speed of the rotor 27 (a combination of the first rotor 27a and the second rotor 27b) to be switched between a low speed and a high speed.

The second rotor 27 b is suspended by a pair of link members 76 and 77 whose upper ends are supported by the beam member 66 via a spring 78.
The pair of link members 76, 77 includes a first link member 76 whose one end is fixedly supported by the beam member 66 and a second link member 77 whose one end is rotatably connected to the other end of the first link 76. Thus, the spring 78 is connected between the other end of the second link member 77 and a mounting piece 74 a rotatably supported by the reinforcing member 74.

A bent piece 82 is fixed to the lower end of the rotor vertical position adjusting lever 81, and the bent piece 82 is rotatably supported by the support frame 65. When the lever 81 is rotated in the left-right direction of the vehicle, the lever 81 is bent near the protrusion 66a fixedly supported by the beam member 66 that is rotatably supported by the side members 65b of the support frame 65. The piece 82 rotates up and down. Since the bent piece 82 is locked below the protrusion 66a, the protrusion 66a rotates the lever 81 in the right direction of the machine body (in the direction of arrow S in FIG. 4), so that the beam member 66 is centered upward. As a result of the rotation of the protrusion 66a, the end of the first link member 76 opposite to the connecting portion with the beam member 66 also rotates upward about the beam member 66. By rotating the first link member 76 upward, the second rotor 27b can be raised upward via the second link member 77 and the spring 78. When the second rotor 27b is moved upward, the first rotor 27a is also simultaneously moved upward via the second drive shaft 70b and the first drive shaft 70a.
Since the rotor vertical position adjusting lever 81 is provided at substantially the center of the vehicle body 2, it is easy to balance left and right when the first rotors 27a and 27b are moved up and down.

  A rotor housing lever 84 that also serves as a clutch lever is fixed to the beam member 66. When the lever 84 is rotated in the direction of arrow T (FIG. 3), the support arm 67 is interlocked with the rotation of the beam member 66. Also rotates in the direction of arrow T. As the support arm 67 rotates in the direction of the arrow T, the rotor support frame 68 moves upward, so that the first rotors 27a and 27b are stored in the storage position, that is, in the back side of the seedling stage 51. Can be moved.

In this embodiment, the first rotor 27a and the second rotor 27b at a low speed position of the rotor vertical position adjusting lever 81 at a height of 40 mm from the farm scene are rotated up to 15 mm from the low speed position by turning in the arrow S direction in FIG. It is set so that it can be lowered by a maximum of 15 mm from the low speed position by turning in the direction opposite to the arrow S direction in FIG.
Note that one end of the beam member 66 is used instead of the protrusion 66 a, the bent piece 82, the rotor vertical position adjustment lever 81, and the rotor storage lever 84 as a configuration in which the beam 27 is rotated to move the rotor 27 up and down. A configuration in which the beam member 66 is rotated by the electric motor 113 (FIG. 4) provided in FIG.
Further, as shown in FIGS. 1 and 3, a rotor cover 37 (first rotor cover 37a and second rotor cover 37b) is provided on the upper rear side of the rotor 27 so that mud is not applied to the floats 55 and 56. Yes.

A second rotor 27b is disposed on the front side of the pair of transmission shaft cases 73, 73 on the left and right inner sides of the cases 73, 73, and the rear portions of the pair of transmission shaft cases 73, 73 are disposed on the cases 73, 73. The first rotors 27a and 27a are respectively disposed outside the first rotor 27a and the second rotor 27a.
Therefore, the rotor 27 is arranged evenly over the entire width in the left-right direction of the planting position of the rice transplanter 1 and thus the rice transplanter 1, and the leveling width of the field is widened, and the leveling performance can be improved.

FIG. 7 shows a configuration of a control device 163 that controls the operation of the electronic fuel injection device (EFJ) 49 in accordance with the operation amounts of the main transmission lever 16, the auxiliary transmission lever 17, and the accelerator pedal 39. FIG. 8 shows the configuration of the control device 163 that controls the raising / lowering of the other seedling planting unit 4 and the PTO clutch solenoid 162 for driving the seedling planting device 52.
That is, FIG. 7 shows the traveling speed (moving speed) and seedling of the main transmission lever 16 for setting the shift output by the hydraulic continuously variable transmission (HST) 23 and the auxiliary transmission in the gear transmission (not shown) when traveling on the road. The operation positions of the auxiliary transmission lever 17 for setting either the traveling speed (planting speed) at the time of planting or the state (PTO) for driving only the seedling planting unit 4 and the accelerator pedal 39 for setting the engine output Detection is performed by the forward operation position sensor 16a of the main transmission lever 16, the reverse operation position sensor 16b of the main transmission lever 16, the auxiliary transmission lever sensor 17a, and the accelerator pedal sensor 39a, and is transmitted to the control device 163. Is a configuration that controls the operation of the electronic fuel injection device (EFJ) 49 so that the output corresponds to the output value of each sensor.

  The main speed change lever 16 guides the operation of the main speed change lever 16 shown in the configuration of the input portion by the operation of the main speed change lever 16 of the control device 163 in FIG. 7 and shifts the groove in the forward direction and the reverse direction. It is operated along a bent lever operation guide groove 45 comprising a groove and a groove that holds a neutral position between both grooves. The guide groove 45 is provided on the upper surface of the front cover 32.

  In this embodiment, the main speed change is made to the first speed (first speed) in the reverse direction with respect to the engine speed when the main speed change lever 16 is inserted into the groove for shifting in the reverse direction in the groove that holds the neutral position. It is characterized in that the engine speed when the lever 16 is moved is reduced.

  The forward operation position sensor 16a is configured to be operated in the front-rear direction at a neutral position in the lever operation guide groove 45, and the main transmission lever 16 detects the presence of the lever 16 on the forward side of the neutral position of the operation guide groove 45. And a reverse operation position sensor 16b for detecting the presence of the lever 16 on the reverse side of the neutral position of the operation guide groove 45.

  FIG. 9 shows changes in engine speed with respect to 9 forward speeds and 6 reverse speeds for each moving speed and planting speed. Here, the eco mode is a mode in which the engine speed with priority on fuel consumption is set by a method of setting a predetermined engine speed smaller than the power mode. In addition, there is a mode for setting a power-priority engine speed that is a power mode with respect to the eco mode, and the seedling transplanter of the present embodiment operates the mode changeover switch 48 to operate the mode changeover switch 48 on the software. Both engine speed modes can be set.

Here, each broken line indicates that when the neutral main shift lever 16 is shifted backward from the engine rotation speed of about 1900 to 2600 rpm when the neutral main shift lever 16 is on the forward side, the engine rotation speed of the accelerator pedal 39 It shows that the engine speed rapidly increases to about 3200 rpm regardless of the depression amount, and that the engine speed rapidly decreases to about 2400 rpm when the main transmission lever 16 is operated to the first reverse speed.
Thus, in the case of backward seedling transplanter with increasing seedling planting unit 4, the reverse raises quickly seedling planting unit 4 by increasing the engine speed before beginning, the engine speed when the rear proceeds actually begins If the number is lowered, it will not reverse at a higher speed than expected, so the safety of the pilot can be improved.

Further, an upper limit of the engine speed when the accelerator pedal 39 is fully depressed (when the accelerator is fully opened) is provided for each shift operation position of the main shift lever 16. This is shown in FIG.
Thus, by providing an upper limit of the engine speed when the accelerator pedal 39 is fully depressed for each speed change operation position of the main speed change lever 16, the injection amount of the engine is not increased more than necessary, and the fuel efficiency is improved. Since the engine speed does not increase more than necessary even when the pedal 39 is fully depressed, the seedling transplanter is excellent in maneuverability because it can be operated while fully depressing the accelerator pedal 39 without fine adjustment.

  In addition, by making the maximum engine speed different between about 3,600 rpm and 4,000 rpm in eco mode and power mode, respectively, operating in power mode in wet fields and operating in eco mode in Asada will improve fuel efficiency. It can be improved further.

  As shown in FIG. 9, the engine speed for each position (speed stage) of the main transmission lever 16 is changed between “planting speed” and “moving speed”. This is to improve the maneuvering performance of the seedling transplanter by changing the running feeling between the “planting speed” and the “moving speed” even at the same speed stage.

In addition, FIG. 10 shows the change in speed with respect to 9 forward speeds and 6 reverse speeds for each “moving speed” and “planting speed”. Here, the “moving speed” is set so as not to exceed the maximum speed (15 km / h) set by the standard for small special vehicles.
In this way, the running speed is prevented from being too fast due to variations in the body of the seedling transplanter.

  In the working machine (seedling transplanter) of the present embodiment, the control device 163 performs various operations such as seedling planting during turning based on the detection of the rotational speed of the transmission shaft (not shown) of the rear wheel 11 inside the turning. Swing-linked control can be performed automatically. This control mode is sometimes referred to as an automatic planting start mode. In particular, when the rear wheel 11 inside the turn is steered by a predetermined angle or more, the turn interlock control can be performed.

The concept of this control is shown in FIG.

  That is, when the steering wheel 34 is turned off and the side clutch of the rear wheel 11 inside the turn is disengaged, the rotational speed of the left and right transmission shafts is detected, and the transmission shaft speed of the inner rear wheel 11 during the turn is the set value N1. If it exceeds, seedling planting part 4 will be lowered. Thereafter, the steering wheel 34 is turned off after the transmission shaft speed of the rear wheel 11 is set to the set value N2 and the operation of the seedling planting tool 52a enters the “cut” state (= the seedling planting portion 4 moves up). This is a mechanism for making the planting “enter” when the rotational speed n of the transmission shaft of the rear wheel 11 until the start becomes equal to or greater than the total value.

  If the automatic planting start mode is set when the engine is rotating in the power mode with priority on power, when the seedling planting unit 4 starts to rise, the engine is switched from the power mode to the eco mode with priority on fuel consumption. Reduce the speed. When the engine speed decreases, the vehicle speed decreases, so that the seedling transplanter can turn smoothly. Then, when the seedling planting part 4 starts to descend at the end of turning by the automatic planting start mode, it is configured to return from the eco mode to the power mode, or at the time when turning by the automatic planting start mode ends. When it is detected that the appendage 4 is lowered and the float 56 is grounded, the engine speed can be changed from the eco mode to the power mode. In either case, seedlings can be planted and run without difficulty in the wet fields.

An example of a flowchart of the turning interlock control is shown in FIG.
First, the rotational speeds of the transmission shafts of the left and right rear wheels 11, 11 are detected by the transmission shaft rotational speed sensor 47, and the set value N1 (inner transmission shaft (transmission shaft) rotation signal setting from the start of turning to 90 ° turn of the machine body) is set. Value), N2 (set value of transmission shaft rotation signal from turning 90 ° of the fuselage to planting clutch “ON”), θ1 (lower limit value of steering wheel cut angle during straight operation), θ2 (in straight drive operation) The upper limit value) of the steering wheel setting angle is set with the setting dials 208a, 208b, 206a, 206b, respectively.

  Next, a setting dial (not shown) that adjusts the set values of the rotational speeds N1 and N2 and the handle cutting angles θ1 and θ2 in order to cope with differences in the field conditions such as hardness and softness of the field, water depth, and tiller depth. ) To set the correction value n0.

  Whether the seedling planting tool 52a of the seedling planting unit 4 is in a seedling planting state or not is operated by a finger lever 166 near the handle 34 (the seedling planting unit 4 is turned on or off, or the seedling planting unit 4 is operated). The operation of the seedling planting tool 52a is in the “ON” state when the control device 163 is detected in accordance with the operation of the lever) and the planting “ON” is changed to “OFF”. The rotation speed n of the transmission shaft of the rear wheel 11 is detected by the transmission shaft rotation speed sensor 47 until the operation of the seedling planting tool 52a is in the “cut” state after entering, and the value (n) is stored. deep.

  Next, the difference in the rotational speed n of the transmission shaft of the left and right rear wheels 11 is detected by the transmission shaft rotational speed sensor 47. If there is a difference in the rotational speed n, it is determined that the vehicle is not traveling straight. When the seedling planting unit 4 starts to rise (this step is not shown), immediately switch to the power mode via the step shown in step S1 or In the procedure until the seedling planting part 4 starts to rise and is completed by a procedure not shown, the mode is changed to the power mode in the same manner through the steps shown in step S1, and the seedling planting part 4 rises. After that, the aircraft can be slowly turned from the power mode to the eco mode, and when the seedling planting part 4 starts to descend, the eco mode is returned to the power mode (see step S2) so that the normal seedling planting operation can be performed. can do.

In addition, when the steering angle of the steering wheel 34 (steering angle) θ is detected by a steering wheel rotation angle sensor (potentiometer) 33 provided on the shaft of the steering wheel 34 and the vehicle is not traveling straight, whether the vehicle is turning in the left or right direction. Is detected.
When the left turn is in progress, the rotational speed of the transmission shaft of the left rear wheel 11 is detected, and when the rotational speed n1 is n1 ≧ N1 + n0, the aircraft has turned 90 degrees or more from the start of turning, so the seedling planting section 4 Lower.
Here, as shown in step S2, preparation is made so that the engine speed can be increased from the eco mode to the power mode so that the vehicle can smoothly travel straight during planting.

Next, the headland is leveled as the seedling planting unit 4 descends. Further, after turning the aircraft 90 degrees, the steering wheel 34 is advanced while loosening the turning degree, and when the rotational speed n2 of the left and right transmission shafts of the left rear wheel 11 becomes n2 ≧ N2 + n + n0, the seedling planting tool 52a is operated. Start planting seedlings.
And if the seedling planting part 4 will be in a grounding state, a rotation signal count value will be cleared as planting "entering".

  Note that instead of switching from the eco mode to the power mode starting at step S2 next to the “planting part“ lower ”” to increase the engine speed, “*” next to this “planting“ enter ”” step is performed. It is good also as a structure which switches from eco mode to power mode which starts with said step S2 at the timing shown by "", and switches from eco mode to power mode when planting is started.

In the rice transplanter of this embodiment, only when the automatic planting start mode is set, the drive of the rear wheel 11 inside the turn is intermittently automatically driven according to the rotation speed of the rear wheel 11 outside the turn. Pumping brake turning (also called pumping clutch turning) that consists of transmission can be performed. By performing the pumping brake turning in this way, there is little impact caused by braking, and a braking cycle corresponding to the turning angle of the rear wheel 11 can be obtained without being affected by the engine rotation or the vehicle speed. In pumping brake turning for turning on / off the clutch of the rear wheel 11 on the inside of the turn, the slower the vehicle speed, the shorter the pumping cycle, and the faster the pumping cycle, the longer the pumping cycle. There can be no braking.
In addition, it is good also as a structure which controls the side brake which brakes the rear-wheel 11 instead of controlling the said side clutch.

  For example, the side clutch (including ON / OFF) of the side clutch (not shown) of the transmission shaft of the rear wheel 11 inside the turn at a vehicle speed of 0 m / s is 0.5 seconds, and the side clutch is at a vehicle speed of 0.5 m / s. Depends on vehicle speed linearly so that the operation cycle (including on / off) is 1.0 second and the side clutch operation cycle (including on / off) is 1.5 seconds at a vehicle speed of 1.0 m / s. Thus, the side clutch operating cycle of the transmission shaft of the rear wheel 11 inside the turn is changed.

  When traveling at high speed, the impact is particularly great when the clutch of the transmission shaft of the rear wheel 11 is turned on or off. Therefore, as described above, in order to reduce the impact caused by the pumping brake, the on / off cycle of the pumping brake (which is performed by a clutch operation arm or a brake operation arm (not shown)) is made longer as the vehicle travels at a higher speed.

Like the 6-row rice transplanter of this embodiment, a large traveling vehicle needs to make a relatively large turn when turning. However, if the side clutch of the transmission shaft of the rear wheel 11 inside the turn is kept off during turning, the turn becomes too small. However, if the transmission shaft of the rear wheel 11 inside the turn is pumped brake controlled as in this embodiment, the operator can perform braking without feeling uncomfortable at the turn, and the appropriate turning radius desired by the operator can be reduced to 6 A relatively large turn suitable for a striped rice transplanter is possible.
In the case of a right turn, the same control is performed as in the case of a left turn.

  Note that during the turning control, the hydraulic sensitivity of the hydraulic cylinder 46 of the seedling planting unit 4 is insensitive (not switched to the rising side) between “lowering” of the seedling planting unit 4 and “entering” the seedling planting unit 4. It is desirable to set the center float 55 and the like to the front-up state by setting the state. This can be done by setting the control target of the center float sensor 169 so that the center float 55 is in the forwardly raised state. By turning the center float 55 in the forwardly raised state, the turning trace can be leveled, Ground treatment can be performed easily and accurately.

  As described above, the method of detecting the rotational speed of the transmission shaft (transmission shaft) of the rear wheel 11 in which the side clutch is disengaged is more susceptible to slip and the like than the rotational speed detection method of the rear wheel 11 to which power is transmitted. There are features that are difficult to receive. Further, since the rotational speed of the transmission shaft that rotates faster than the rear wheel 11 is detected, the measurement accuracy can be easily increased. As a result, there is an effect that the planting start of the seedlings for each planting line becomes substantially constant (the headland width (D) is constant).

  Further, the start button (switch) 184 for turning control for performing various operations of the turning control shown in FIG. 12 may be used as a button for setting the start position for seedling planting.

  In the rice transplanter of the present embodiment, as described above, a control mode (automatic planting start mode) in which the planting start position of the seedling after turning is automatically set based on the rotation speed of the rear wheel 11 can be set. It has a configuration. In this control mode setting, the turning start timing is detected by the turning angle (cutting angle) sensor 33 of the handle 34, and the travel distance from the turning start detected by the turning angle sensor 33 is set to the wheel (the transmission of the rear wheel 11 inside the turning). Based on the detection value of the rotational speed sensor 47 of the shaft), when the travel distance reaches a predetermined value, planting of the seedling is automatically started without operating the seedling planting lever 14 (FIG. 2). Automatic planting start mode.

The automatic planting start mode is set by a planting start adjustment dial (not shown), and the travel distance from the start of turning to the start of seedling planting is determined by turning the planting start adjustment dial 212 shown in FIG. Set.
Although the travel distance can be appropriately selected according to the rotation angle of the planting start adjustment dial 212, a dial turning angle region outside the travel distance adjustment range of the dial 212 (and enters an automatic planting start mode). Auto lift function that can select a control mode for automatically raising the seedling planting unit 4 at the start of turning of the vehicle in the previous dial turning angle region) and automatically raising the seedling planting unit 4 when the vehicle reverses The back lift function that can select the control mode is also used.

  Then, when the dialing operation of the planting start adjustment dial 212 reaches the position corresponding to the auto lift function at the position where the indication unit of the planting start adjustment dial 212 indicates “auto lift”, the auto lift function is turned on. Therefore, it is possible to employ a control mode in which the pumping clutch control is started at the same time as the autolift control mode is started.

This is because the wheels 10 and 11 are likely to slip during turning in the wet field, and the planting start position of the seedling is unlikely to be the planned position in the automatic planting start mode. Only in conjunction with the pumping clutch control.
Thus, it becomes possible to easily perform the turning traveling of the vehicle under the condition of easily slipping.

Further, when the automatic planting start mode is not set, for example, when driving on the road, the pumping clutch is not turned, and the normal turning is performed while turning off the side clutch of the transmission shaft of the wheel (rear wheel 11) inside the normal turning. A swivel mode can also be set.
Further, in the rice transplanter of the present embodiment, when the auxiliary transmission lever 17 (FIG. 1) is selected to travel on the road or by connecting the brake pedals (not shown) of the left and right wheels, When operating simultaneously (by this brake pedal connection, it is possible to avoid problems due to sudden steering due to only one of the left and right side brakes operating) of the wheel (rear wheel 11) inside the turn Turning can be performed smoothly by using the normal turning mode in which the side shaft of the transmission shaft is disengaged.

  When the engine speed is high (when the governor is wide open), if the engine is decelerated rapidly, there is a phenomenon that the engine speed further decreases after the governor further opens and the engine speed increases. Therefore, according to the flow shown in FIG. 13, in the case of rapid deceleration, fuel supply to the engine is partly cut. For example, in the case of a two-cylinder engine, by driving only a one-cylinder engine, the engine speed can be reduced without any problem even if rapid deceleration is performed.

  INDUSTRIAL APPLICABILITY The present invention can be used as a work machine having excellent safety by controlling the engine speed of a rice transplanter or the like, and has a great applicability.

DESCRIPTION OF SYMBOLS 1 Riding type rice transplanter 2 Traveling vehicle body 3 Lifting link apparatus 4 Seedling planting part 5 Fertilizer 10 Front wheel 11 Rear wheel 12 Transmission case 13 Front wheel final case 14 Seedling lever 15 Main frame 16 Main transmission lever 16a Advance side operation position sensor 16b Reverse operation position sensor 17 Sub transmission lever 17a Sub transmission lever sensor 18 Rear wheel gear case 19 Rotor transmission cover (case)
20 Engine 21 Belt transmission device 23 HST 24 Drawing marker 25 Planting clutch case 26 Planting transmission shaft 27 Rotor 27a First rotor 27b Second rotor 28 Fertilizer transmission mechanism 30 Engine cover 31 Seat 32 Front cover 33 Handle turning angle sensor 34 Handle 35 Floor step 36 Rear step 37 (37a, 37b) Rotor cover 38 Preliminary seedling stage 39 Accelerator pedal 39a Accelerator pedal sensor 40 Upper link 41 Lower link 42 Link base frame 43 Vertical link 44 Connecting shaft 45 Lever operation guide groove 46 Lift hydraulic pressure Cylinder 47 Rear wheel transmission shaft rotational speed sensor 48 Mode changeover switch 49 Electronic fuel injection device (EFJ)
DESCRIPTION OF SYMBOLS 50 Transmission case 51 Seedling stand 51a Seedling outlet 51b Seedling feeding belt 52 Seedling planting device 52a Seedling planting tool 53 Blower electric motor 55 Center float 56 Side float 58 Blower 59 Air chamber 60 Fertilizer hopper 61 Feeding part 62 Fertilization hose 65 Seedling planting support frame 65a Support roller 65b Both side members 66 Beam member 66a Protrusion 67 Support arm 68 Rotor support frame 70a First drive shaft 70b Second drive shaft 71 Connecting member 72 Universal joint 73 Transmission shaft case 74 Reinforcement Member 74a Mounting piece 76 First link member 77 Second link member 78 Spring 81 Rotor vertical position adjustment lever 82 Bending piece 84 Rotor housing lever 113 Rotor lifting motor 160 Grooving device 161 Electromagnetic hydraulic valve 162 PTO clutch solenoid 163 Control Device 16 Finger lever 169 center float sensor 184 start button 206a θ1 setting dial 206b θ2 setting dial 208a N1 setting dial 208b N2 setting dial 212 planted beginning adjustment dial

Claims (8)

The engine (20), the traveling wheel (11), the steering handle (34), the accelerator pedal (39) for adjusting the fuel ejection amount of the engine (20), and the power from the engine (20) are input to the airframe. Then, a hydraulic continuously variable transmission means (23) that continuously changes the rotational speed from the engine (20) and transmits it to the traveling wheels (11), and a rear stage of the hydraulic continuously variable transmission means (23). A transmission comprising mechanical transmission means for shifting to the provided stepped gear stage, a manual main transmission lever (16) for changing the shift position of the hydraulic continuously variable transmission means (23), and mechanical transmission A working machine provided with a seedling planting part (4) having a manual auxiliary transmission lever (17) for changing the speed change position of the means, and further having a float (55, 56) in contact with the bottom of the farm scene at the rear of the machine body In
The engine speed when the transmission is in the neutral position on the reverse side is set larger than the engine speed when the transmission is in the neutral position on the forward side, and the transmission is in the first gear position in the reverse direction. The engine speed is set to be smaller than the engine speed when the transmission is in the neutral position on the reverse side, and the highest engine at the seedling planting traveling speed (planting speed) set by the mechanical transmission A work machine provided with a control device (163) having a control configuration in which the number of revolutions is increased in a power mode that prioritizes power and decreased in an eco mode that prioritizes fuel consumption . The engine (20), the traveling wheel (11), the steering handle (34), the accelerator pedal (39) for adjusting the fuel ejection amount of the engine (20), and the power from the engine (20) are input to the airframe. Then, a hydraulic continuously variable transmission means (23) that continuously changes the rotational speed from the engine (20) and transmits it to the traveling wheels (11), and a rear stage of the hydraulic continuously variable transmission means (23). A transmission comprising mechanical transmission means for shifting to the provided stepped gear stage, a manual main transmission lever (16) for changing the shift position of the hydraulic continuously variable transmission means (23), and mechanical transmission A working machine provided with a seedling planting part (4) having a manual auxiliary transmission lever (17) for changing the speed change position of the means, and further having a float (55, 56) in contact with the bottom of the farm scene at the rear of the machine body In
A handle turning angle sensor (33) for detecting the turning angle of the handle (34) is provided;
The engine speed when the transmission is in the neutral position on the reverse side is set larger than the engine speed when the transmission is in the neutral position on the forward side, and the transmission is in the first gear position in the reverse direction. The engine speed is set to be smaller than the engine speed when the transmission is in the neutral position on the reverse side, and the highest engine at the seedling planting traveling speed (planting speed) set by the mechanical transmission When the power mode is set to give priority to the rotational speed, the raising of the seedling planting part (4) is started at the start of turning detected by the handle turning angle sensor (33), and the seedling planting part (4 working machine you characterized in that a controller having a control structure for changing the economy mode (163) to fuel consumption priority engine speed from the power mode in conjunction with the increase in). A center float sensor (169) for detecting that the center float (55) is grounded is provided, and the control device (163) changes from the power mode that prioritizes engine speed to the eco mode that prioritizes fuel consumption, 3. The work machine according to claim 2, wherein the center float sensor (169) has a control configuration for changing the engine speed from the eco mode to the power mode when the center float (55) detects that the center float (55) is grounded . The seedling planting part (4) is provided with a seedling planting clutch, and the control device (163) starts raising the seedling planting part (4) at the start of turning detected by the steering wheel turning angle sensor (33). After changing the engine speed from the power mode to the eco mode in conjunction with the rise of the appendage (4), the engine has the control configuration to change the engine speed to the power mode again when the seedling planting clutch is engaged. The working machine according to claim 2 or claim 3, wherein The engine (20), the traveling wheel (11), the steering handle (34), the accelerator pedal (39) for adjusting the fuel ejection amount of the engine (20), and the power from the engine (20) are input to the airframe. Then, a hydraulic continuously variable transmission means (23) that continuously changes the rotational speed from the engine (20) and transmits it to the traveling wheels (11), and a rear stage of the hydraulic continuously variable transmission means (23). A transmission comprising mechanical transmission means for shifting to the provided stepped gear stage, a manual main transmission lever (16) for changing the shift position of the hydraulic continuously variable transmission means (23), and mechanical transmission A working machine provided with a seedling planting part (4) having a manual auxiliary transmission lever (17) for changing the speed change position of the means, and further having a float (55, 56) in contact with the bottom of the farm scene at the rear of the machine body In
The engine speed when the transmission is in the neutral position on the reverse side is set larger than the engine speed when the transmission is in the neutral position on the forward side, and the transmission is in the first gear position in the reverse direction. The engine speed is set smaller than the engine speed when the transmission is in the neutral position on the reverse side, and the speed change position of the hydraulic continuously variable transmission means (23) by the main speed change lever (16) is changed within a predetermined time. working machine you characterized in that a control device (163) having a control arrangement for stopping part of the fuel supply to the engine (20) when moving in one or more speed reduction side half of the total stroke . The control device (163) shifts the engine rotational speed at the traveling speed (moving speed) at the time of traveling on the road set by the mechanical transmission and the engine rotational speed at the traveling speed (planting speed) at the time of planting seedlings. 6. The work machine according to claim 1, wherein the work machine has a control configuration that is changed for each stage . The control device (163) has a control configuration in which the engine speed at the traveling speed (moving speed) at the time of traveling on the road set by the mechanical transmission device does not exceed the speed reference for a small special vehicle. The working machine according to any one of claims 1 to 6 . The control device (163) controls the engine when the accelerator pedal (39) is fully depressed for adjusting the fuel ejection amount of the engine (20) for each shift position of the hydraulic continuously variable transmission means (23) by the main transmission lever (16). The work machine according to any one of claims 1 to 7, further comprising a control configuration that provides an upper limit value of a rotational speed.

Images