JP3502950B2 - Management machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention attaches a working machine to an airframe.
Used for farming such as tilling, soiling, ridges, trenching, etc.
Management machine. [0002] 2. Description of the Related Art Conventionally, this type of management machine has a traveling shift lever.
The traveling transmission that switches between forward and reverse
PT that turns on / off the power to the PTO shaft by operating the operating lever
An apparatus provided with an O-axis switching device is known. [0003] However, as described above,
In some management machines, the travel shift lever is
When moving forward, the work operation lever
For example, a rotary device linked to a PTO shaft
When the work machine was driven, the rotary device was driven.
In this state, the vehicle travels backward.
Not only do not need to drive the rotary device,
When traveling backward while checking back,
Lack of safety due to being caught in the rotary claw of the device
There was a problem. Also, the work operation lever is in the operation position.
At one time, the traveling speed change lever is incorrectly switched to the reverse
Even when operated, the
As a result, the same problem as described above occurs.
Was. According to the present invention, the vehicle travels backward while the work machine is driven.
Work when traveling backwards
To provide a management machine that can ensure the safety of
Aim. [0005] [MEANS FOR SOLVING THE PROBLEMS]
Therefore, the present invention relates to a traveling speed change lever.OfoperationAxis length in conjunction with
Move in the directionTravel shiftAxisThrough forward gearas well asReverse
Step by stepSwitching running speedMachine, Work operation leverOfoperationBy
RPTOTo axisShaft switching equipment to turn on / off the power ofPlace
In the caseIn the equipped management machine,The work operation
Operation lever travels outside one side of the transmission case
It is swingably supported by the shift shaft,The traveling shift
shiftThe axis is, The traveling shiftAxisReverseStep by stepWhen located
Work operation leverOfOn operationByThe work operation lever
AndInterfere with the travel shiftAxisNeutralIn placeBack,
SaidWork operation leverーWhen in the operating position,
Speed leverToOperation to shift to reverse gear by traveling shift gear shaft
Work operation leverAndInterfere with the work operation lever
-Control to return to cutting positionCharacterized by having a body
You. [0006] With the above configuration, the traveling speed change lever is provided.InTravel gear shifting
FtAxisReverseStep by stepPosition while traveling backwards,
Operation lever-PTO by mistake input operationOn the axisLinked and linked
If you try to drive the work machineOn the bodyYo
The traveling speed shiftAxisNeutralIn placeReturn and run backward
Can be stopped and the work operation leverーIn operating position
When the traveling gear leverInTravel shiftAxisAccidentally
ReverseStep by stepWhen the switching operation is performed, the controlOn the bodyThan,
The work operation lever-The work machine can be stopped by returning to the cutting position.
As a result, the reverse
When traveling backwards
The safety of the trader can be sufficiently ensured. [0007] FIG. 4 shows the overall structure of a management machine according to the present invention.
This control machine has a cylinder
The engine 2 equipped with a head 21 and a muffler 22 is mounted.
And the transmission case 3 on the rear side of the fuselage 1.
Combined, mainly at the lower front side of the transmission case 3
One traveling wheel 4 and various working devices on the lower rear side
As an example, while supporting the rotary device 5,
The upper part of the case 3 has a U-shaped cross section with an open bottom.
With handle 61 via handle mounting base 6
Take the support frame 62 so that it extends
I have. In addition, the traveling wheel 4 and the rotary device 5
Transmissions installed in transmission case 7 and transmission case 3
It is linked to the engine 2 via the structure 10. That is,
As shown in FIG. 5, the drive pool provided on the engine 2
2a and an input pulley provided on the transmission case 3
3a and a transmission belt 3b.
The power transmission mechanism 10 is installed in the
Power is input to the input pulley 3a via the power transmission mechanism 10.
The transmitted rotational power is transmitted to the traveling wheels 4 and the rotary device 5.
Has reached. The power transmission mechanism 10 is shown in FIGS.
As shown in FIG. 7, operation of the traveling speed change lever 11
Transmission that switches between forward stages F1 and F2 and reverse stage R
12 and the sub-shift lever 13 are operated to switch between high and low
Operation of the auxiliary transmission 14 and the work operation lever 15 causes the PTO shaft
The power to 16 is high and low two stages of forward rotation and high and low two stages of reverse rotation and
P consisting of a work transmission that switches to the neutral position with power off
TO shaft work switching device (hereinafter referred to as work transmission) 17
The operation of the work on / off lever 18 causes the movement to the PTO shaft 16.
And a PTO shaft on / off device 19 for turning on / off the force.
The input pulley 3a is fixed to the transmission case 3.
Main shaft 20, intermediate shaft 21, sub shaft 22, reduction shaft 23 and
And the PTO shaft 16 are rotatably supported.
FIG. 6 shows the structure of the power transmission mechanism 10 for easy understanding.
The main shaft 20, the intermediate shaft 21, the sub shaft 22, and the reduction shaft 23
FIG. 3 is a cross-sectional view showing the PTO shaft 16 and the PTO shaft 16 irregularly developed.
In addition, the traveling transmission case 35 which is originally located
Expanding backwards. The main shaft 20 is connected to the input pulley side.
Two large and small gears 2 are attached to a spline portion 20a provided on the side.
Work with 4a, 24b and shift fork engaging portion 24c
The forward rotation gear 24 is supported so as to be movable only in the axial direction.
The forward low speed first gear 25 is located in the middle, and the forward high speed is
Second gear 26 is fixed. The intermediate shaft 21 is provided on one side thereof.
The first and second gears of the main shaft 20 are attached to the spline portion 21a.
25, 26, two large and small gears 27a,
Main transmission gear having a shift fork engaging portion 27c and a shift fork engaging portion 27c
27 is provided so as to be movable only in the axial direction.
A third gear 28 for high speed is provided at the intermediate portion of 21 and on the other side portion.
The fourth gear 29 for low speed is fixed. The countershaft 22 has a slide provided on one side thereof.
The large size of the work machine forward rotation transmission gear 24 is
A large gear 30a and a small gear 30b that always mesh with the gear 24a
Work machine reverse speed change having gear and shift fork engaging portion 30c
The gear 30 is supported so as to be movable only in the axial direction.
A fifth reverse gear 31 is provided at an intermediate portion of the sub shaft 22,
The spline portion 22b provided on the other side of the
Two large gears that selectively mesh with the third and fourth gears 28 and 29
The small gears 32a and 32b and the shift fork engaging portion 32c
The auxiliary transmission gear 32 is supported so as to be movable only in the axial direction,
And the other end of the countershaft 22 from the transmission case 3
Extending outwardly, the driving sprocket of the traveling wheel 4 is
While the ket 33 is provided, the transmission case 3
Drive sprocket 33 is installed at one end and runs to the other end
A transmission gear for traveling in which the axle 34 of the wheel 4 is rotatably supported.
And the drive shaft is fixed to the axle 34.
A driven sprocket 36 facing the rocket 33 is provided,
Of the driving sprocket 33 and the driven sprocket 36
A chain 37 is installed between the two to run the rotational power of the sub shaft 22.
This is transmitted to the row wheels 4. The reduction gear shaft 23 has a forward rotation of the work machine.
Large and small gears 24a, 24b of gear 24 or work machine reverse rotation
The large and small gears 30a and 30b of the gear 30 selectively mesh with each other.
A reduction gear body 38 having two large and small gears 38a, 38b
The PTO shaft 16 has a spline portion 1
6a, an interlocking gear meshing with the small gear 38b of the reduction gear body 38;
Gear having a gear 39a and a shift fork engaging portion 39b
39 is movably supported only in the axial direction, and the P
One end of the TO shaft 16 projects outside the transmission case 3
Then, the tilling shaft (not shown) of the rotary device 5 is provided on the protrusion.
A drive sprocket 40 for transmitting power to the vehicle is provided. In the transmission case 3,
In the vicinity of the shaft 21, as shown in FIGS.
The traveling speed change shift shaft 41 operated by the line speed shift lever 11 is
Shaft length direction(Hereinafter referred to as axial direction)Movably supported,
The tip of the first shift fork 42 attached to the shift shaft 41
Is locked to the locking portion 27c of the main transmission gear 27,
Speed lever11In the axial direction of the shift shaft 41 with the operation of
By the action, the main transmission gear 2
7 in the axial direction, and the large gear 2 of the main transmission gear 27 is moved.
7a meshes with the first forward gear 25 of the main shaft 20
To the first forward gear F1 and the small gear 27 of the main transmission gear 27.
b is engaged with the second forward gear 26 of the main shaft 20.
The second forward speed F2 and the large gear 27a of the main transmission gear 27
Is meshed with the fifth reverse gear 31 of the sub shaft 22,
Switch to reverse gear RThatRunning transmission 12
Is composed. The counter shaft 22 in the transmission case 3
Near the auxiliary transmission shift operated by the auxiliary transmission lever 13.
The shift shaft 4 is supported so as to be movable in the axial direction.
7 is attached to the end of the second shift fork 48
The auxiliary transmission lever 1
3 by the axial movement of the sub-transmission shift shaft 47 accompanying the operation of Step 3.
And the auxiliary transmission gear 32 is
The auxiliary transmission gear 32 is moved in the axial direction with respect to the shaft 22.
The large and small gears 32a, 32b are connected to the third and fourth gears of the intermediate shaft 21.
28 and 29, the main shaft 20 can be rotated.
Rolling power is transmitted to the traveling wheels 4 from the sub shaft 22 via the intermediate shaft 21.
The transmission speed is switched between high speed and low speed,
Transmission so that the traveling speed of the
14. The main components of the mission case 3 are as follows.
Work that is operated by the work operation lever 15 above the shaft 20
Machine forward rotation shift shaft 49 and work machine reverse rotation shift shaft 50
Are arranged side by side so that they can move in the axial direction,
Work on the tip of the third shift fork 51 attached to the shaft 49
The forward rotation gear 24 is engaged with the engagement portion 24c of the
Operation leverFifteenAxial shift by the third shift hoe
Large gear 24a of the work machine forward rotation transmission gear 24
Is the normal high speed where the small gear 38b of the reduction gear body 38 meshes.
Position and large and small gear of work machine forward rotation gear 2424a,2
Neutral position where 4b does not mesh with any of the reduction gear bodies 38
And the small gear 24b of the work machine forward rotation gear 24 is a reduction gear.
The gear can be shifted to the forward low-speed position where the large gear 38a of the body 38 meshes.
And a third gear attached to the reverse rotation shift shaft 50.
The tip of the 4-shift fork 52 is connected to the reverse rotation gear 30 of the work machine.
The work operation lever.FifteenTo
Work via the fourth shift fork 52
The large gear 30a of the reverse rotation gear 30 is
The reverse high-speed position where the small gear 38b meshes and the work machine reverse rotation
The large and small gears 30a, 30b of the transmission gear 30 are the reduction gear body 3.
8 and neutral position N that does not mesh with any of
The small gear 30b of the high speed gear 30 is the large gear 3 of the reduction gear body 38.
Work to switch to reverse rotation low speed position meshing with 8a
The transmission 17 is constituted. PTO shaft in the transmission case 3
For switching by a work on / off lever 18 near 16
The shift shaft 53 is supported so as to be movable in the axial direction.
Switch the tip of the fifth shift fork 54 attached to the shaft 53
The on / off lever 1 is locked by the locking portion 39b of the gear 39.
8 by the axial movement of the switching shift shaft 53 in accordance with the operation of FIG.
And the switching gear 39 through the fifth shift fork 54
The switching gear 39 is moved in the axial direction,
And the switching gear 3 in mesh with the small gear 38b of FIG.
9 is not engaged with the small gear 38b of the reduction gear body 38.
The work on / off device 18 is configured to be selectable with the position.
I have. The traveling speed change lever 11 is shown in FIG.
As shown, it has a V-shape with a vertical base 11a.
Then, the traveling speed change lever 11 is moved to one side of the handle mount 6.
Support member provided for56And swings through the base 11a.
As well as the base of the traveling speed change lever 11
Support member56To the lower part of the
Is provided, and the traveling speed shift
The one side of the input pulley side of the shaft 41 is
3 and projecting outward from the shift shaft 41, the engaging groove
The engagement member 55 having a U-shape in plan view having the 55a
Operation on the traveling speed change lever 11
The tip 57a of the piece 57 is engaged with the engagement groove 55a of the engagement body 55.
And the running gear 11 is swung by the swing operation.
The line shift shift shaft 41 is moved in the axial direction.
You. The traveling speed shift shaft 41 and the transmission case 3
During this time, as shown in FIG.
At five stages of movement positions in the axial direction.
A position holding mechanism 43 is provided. In this case, the position holding
The traveling speed change shaft 41 is connected to the input pulley
In the first stage shown in FIG.
The large gear 27a of the gear 27 meshes with the fifth gear 31 of the countershaft 22.
In the second reverse gear, the main transmission gear 27
Hold at the first neutral position N which does not mesh with any gear, and
At the first stage, the large gear 27a of the main transmission gear 27 is
Maintained at the forward first stage F1 meshing with the forward low speed first gear 25
In the fourth gear, the main transmission gear 27 meshes with any gear.
Not to be held at the second neutral position N, and at the fifth gear,
The small gear 27a of the gear 27 is a second forward gear
It is configured to be held at the forward two-stage F2 meshing with 26.
The position holding mechanism 43 includes
Five engagement recesses 41a are formed adjacent to the speed shift shaft 41
Then, these engagement recesses 41a are attached to the input pulley 3a mounting side.
To reverse gear R, first neutral position N, forward first gear F1, second middle
Standing position N, forward two-stage F2, while the transmission case
3 is provided with one hole portion 44 corresponding to the engagement concave portion.
The ball 45 and the ball 45 are urged toward the concave portion of the portion 44.
The spring 46 is mounted and the ball45The person in charge of
By the pressing engagement of the spring 46 to the mating recess 41a
Thus, the switching stage is maintained. The work operation lever 15 is shown in FIGS.
As shown in FIG.
One side opposite to the force pulley side is outside the transmission case 3
And the rotating cylinder 58 is rotatably supported by the projected portion.
Holding body 58 provided on the transmission case 3
a so as to be immovable in the axial direction and
At the lower part of the outer periphery of the cylindrical body 58,
With the shaft 59 fixed, the cylinder shaft 59 is operated via the pivot shaft 60.
The operating lever 15 is provided so as to swing freely.
Opposite side of the input and pulley sides of the forward and reverse shift shafts 49 and 50
The other side protrudes outward from the transmission case 3
Each of the protruding end portions can be engaged with the work operation lever 15.
Piece bodies 61 and 62 having paired flanges 61a and 62b are provided.
Then, the work operation lever 15 is moved through the rotary cylinder 58.
And the circumferential direction of the traveling shift shaft 41, that is, the longitudinal direction of the machine
To work with the work machine forward rotation shift shaft 49.
Select one of the industrial machine reverse shift shafts 50 and
Engaged, and the work operation lever 15 is
The circumferential direction of the cylinder shaft 59 via the pivot shaft 60, that is, the right and left sides of the machine
Swinging in either direction, the forward or reverse shift shaft
Move one of them in the axial direction,
It is configured to be selected. In this case, the working machine
Between the forward and reverse shift shafts 49 and 50 and the transmission case 3
Between the forward and reverse shifts by the work operation lever 15
A position holding mechanism 63 that holds the shift positions of the shafts 49 and 50
Is provided. This position holding mechanism 63 is shown in FIG.
As described above, the forward shift shaft 49 and the reverse shift shaft 5
0, three engaging recesses 49a, 50a are formed adjacent to each other.
In the forward rotation shift shaft 49, three engagement recesses are provided.
49a is a normal rotation low speed from the mounting side of the traveling speed change lever 11.
Step, neutral position N, forward high-speed step,
In the shaft 50, the three engagement recesses 50a are
From the force pulley side, reverse low speed, neutral position N, reverse high speed
On the other hand, the transmission case 3 has the forward and reverse shift shafts.
Corresponding to both of the engagement recesses 49a, 50a
One through hole 64 is provided, and a pair of holes is formed in the through hole 64.
And the two balls 65, 66 are engaged with each other.
A spring 67 biasing toward the concave side
The gears 65 and 67 are engaged with any engagement recesses to
I try to hold the position. In this case, forward and reverse shift
One of the shift shafts 49 and 50
If the ball comes out of the engagement recess, the coil spring
So that the spring 67 is compressed and adhered.
The contact length is set, and in this state, the other shift axis
It is configured not to be able to move,
The shift operation is performed by simultaneously moving the forward and reverse shift shafts 49 and 50.
Work, and damage the work transmission 17
To prevent it. Further, the auxiliary transmission lever 13 and the work on / off lever
-18 is provided on the hand side of the handle 61, while FIG.
And the shift shift shaft 47 and the shift shift as shown in FIG.
One side of the input pulley side of the shaft 53 to the outside of the transmission case
Protruding, swingable to the transmission case 3 at each protruding end
When one ends of the cranks 68, 69 supported by
In both cases, the sub-transmission lever 1 is attached to the other end of each of the cranks 68 and 69.
3 and the operation on / off lever 18 are connected to the operation wires 70 and 71.
The auxiliary transmission lever 13 or the work input
The operation of the release lever 18 allows the
To shift the shift shaft 47 or the shift shaft 53 in the axial direction.
The sub-shift or P
The power to the TO shaft 16 can be turned on and off. In FIG. 5, reference numeral 72 denotes the work operation lever 15
Is a guide plate provided with the speed change guide groove 72a. The traveling speed change of the traveling transmission 12 is performed.
The shift shaft 41 is shifted to the reverse gear R.
When the work operation lever 15 is turned on,
The traveling speed shift shaft 41 is moved to the first
Return to the neutral position N and operate the work operation lever 15
When in the operating position, the reverse gear R
To the work operation lever 15 during the switching operation to
Return the work operation lever 15 to the neutral position, in other words, to the off position.
Control body 80 is provided. The control body 80 is shown in FIGS.
As shown, the other side of the traveling speed change shift shaft 41 protrudes.
A boss portion 81 that can be inserted into the end portion and an outer periphery of the boss portion 81
Extending upward and downward, and
Shaking when switching to the forward and reverse shift shafts 49 and 50
Abutment parts wider than the dynamic width and projecting inward at both upper and lower ends
From the control unit 82 having a U-shape in side view having 82a and 82b
And the control body 80 is connected to the other side of the traveling speed change lever shaft 41.
The upper and lower contact portions 82a, 8 of the control unit 82 are
2b always faces the outside of the work operation lever 15.
As shown in FIG.
As shown by the solid line, the traveling speed change shift shaft 41
At the reverse gear R closest to the operation lever 15, the work operation
When the bar 15 is in the neutral position,
The contact portions 82a and 82b interfere with the work operation lever 15.
When the traveling speed shift shaft 41 is in the reverse gear R,
When the operation lever 15 is at the normal rotation high speed position or the reverse rotation high speed position,
The upper contact portion 82a of the control body 80 and the work operation lever 15
Interfere with each other, and the traveling speed shift shaft 41
And the work operation lever 15 is in the forward low-speed position or the reverse low-speed position.
When the controller 8 is in the position,
0 and the lower part of the work operation lever 15
It is placed in a position where it intervenes. In this case,
When the shaft 41 is located at the first neutral position N, FIG.
The upper and lower contact portions of the control body 80 at positions indicated by virtual lines
82a, 82b are separated from the work operation lever 15
The upper and lower contact portions 82a, 82b of the control body 80
And the work operation lever 15 do not interfere with each other.
The upper and lower abutment portions 82 than in the case of the first neutral position N
a, 82b are located away from the work operation lever 15
First neutral position N, forward one-step F1, second neutral position N and front
When the control body 80 is located at the second step F2,
The upper and lower contact portions 82a, 82b and the work operation lever 15
There is no interference. Thus, the traveling speed shift shaft 41 is
When the operation lever 15 is rotated forward or
When attempting to shift to the reverse high-speed position,
The upper part of the lever 15 is in contact with the upper contact part 82a of the control body 80.
The traveling speed shift shaft 41,
-11 is pushed back to the first neutral position N.
With the line shift shift shaft 41 in the reverse gear R,
Move the work operation lever 15 to the forward or reverse rotation low speed position.
The lower part of the work operation lever 15 is
Interference with the lower contact portion 82b of the control body 80 causes
Shift shaft 41, that is, the traveling speed change lever 11 in the first neutral position.
Push it back to N. As a result, during reverse
If the drive unit 5 is accidentally driven,
Return the speed change lever 11 to the first neutral position N to forcibly drive the vehicle.
Can be stopped. On the other hand, the work operation lever 15 is indicated by a virtual line in FIG.
When in the forward or reverse high-speed position as shown in the above,
When the traveling speed change lever 11 is switched to the reverse gear R,
The upper contact portion 82a of the control body 80 is a work operation lever.
15 and the work operation lever 15 is in the neutral position
N, and the work operation lever 15
Is in the forward or reverse high speed position,
When the bar 11 is switched to the reverse R,
The lower contact portion 82b of the body 80 is the lower end of the work operation lever 15.
And pushes back the operation lever 15 to the neutral position N
It is. As a result, the work operation lever 15 is operated.
When in the working position, the traveling speed change lever 11
When the operation is switched to the advance R, the work operation lever
-15 to the neutral position to forcibly stop the rotary device 5.
Can be stopped. As a result, during reverse traveling, the rotary device 5
Eliminates the need to drive
Is caught in the rotary claw of the rotary device 5
This prevents the safety of workers when traveling in reverse.
It can be sufficiently secured. Further, in the above embodiment, the main transmission lever
11 and the operation part of the work operation lever 15
Distributed on both sides of the case 3
As a swing fulcrum of the operation lever 15, a traveling speed change shaft
41 using the traveling speed change shift shaft 41
Then, the work operation lever 15 enters the reverse position at the reverse R position.
Simple installation of a control body 80 linked to the swinging motion
Reverse traveling with the simple configuration, with the rotary device 5 driven
Control mechanism to control the
It is necessary to specially provide a complicated control mechanism with operating means
And the structure can be simplified, and the width of the fuselage 1
Can be kept narrow. In this embodiment, the handle 61 is provided.
The handle support frame 62 and the traveling speed change lever 11 are
It is mounted so that it can change its direction in the longitudinal direction of the body 1. this
In this case, as shown in FIG.
It has a through hole 83a in the center and a plurality of notches 83b on the outer circumference.
While supporting the annular spacer 83 provided,
A handle support frame 62 is formed at the center of the bottom wall on the outer periphery
Through the through hole 62a, and on the spacer 83
An annular fastening plate 84 having a diameter larger than that of the spacer 83 is placed, and
A plurality of fastening plates 84 are attached to the handle mounting base 6 through the spacers 83.
The handle support frame 62 is fixed with bolts 85.
Is rotatably supported around the spacer 83, while the c
A plurality of engaging holes 62b are provided in the handle support frame 62.
At the same time, the handle mounting base 6 is engaged with the engagement hole 62b.
A pair of the pin 86 and the pin 86
Locking mechanism 88 comprising an operating body 87 for engaging and disengaging.
Is provided. Insertion of bolt 85 provided in spacer 83
As shown in FIG. 12, a notch hole 8 opened to the outer periphery
3b, the spacer 83 is compared with the case where a round hole is formed.
Of the hand can be kept small,
Miniaturization by keeping the width of the support frame 62 small.
Can be planned. Further, the direction change of the traveling speed change lever 11 is performed.
As shown in FIG. 8, the structure that enables
The member 56 rotatably supports the cylinder 89,
The lower end of the body 89 is projected below the support member 56,
An operation piece 57 extending in the front-rear direction is fixed to the protrusion,
A step projecting inward at a longitudinally intermediate portion in the cylindrical body 89;
A portion 89a is provided, and a spline groove is formed on the inner surface of the step portion 89a.
89b, while the proximal end of the traveling speed change lever 11
Small diameter portion 11b smaller in diameter than the spline groove 89a
And a spline portion 1 engaged with the spline groove 89b.
1c and the large-diameter portion 11d engaged with the step portion 89a.
Formed and provided at the tip of the small diameter portion 11b via a screw.
A spring 91 is interposed between the washer 90 and the step 89a.
The spline portion 11c is always in the spline groove 89.
b. Thus, the traveling speed change lever 11
When changing the direction, the base 11a of the lever 11 is
The operation piece 5 is lifted up against the spring 91.
Without rotating the cylinder 89 to which the
The engagement between the in section 11c and the spline groove 89b is released.
In this state, rotate the traveling speed change lever 11 to an arbitrary position.
And release the hand at that position to make contact with the spline section 11c.
Change direction by engaging with plumbing groove 89b
Can be. Further, in this embodiment, FIGS.
As shown in FIG.
And a check mechanism 92 for checking switching to the forward two-stage F2.
I am. The restraint mechanism 92 is located on one side of the handle mount 6.
A Z-shaped mounting plate 93 is fixed to the
The L-shaped restraining rod 94 moves up and down inside the mounting plate 93
And the restraining rod 94 is always lowered through a spring 95.
While the side wall 93a of the mounting plate 93 is
The upper end is engaged with the upper end of the restraining rod 94, and the restraining rod 94 is
The rear end portion 57a of the operation piece 57 is located at the second forward stage
Forming a first engaging portion 93b for holding the portion in a protruding state;
At the same time, the upper end of the
And engages the restraining rod 94 with the rear end 5 of the operation piece 57.
7b is held in an upper restraint release position that does not engage with
An engaging portion 93d is formed. Thus, the handle
Normal state in which the support frame 62 is located on the rear side of the body 1
When the aircraft 1 travels in the state, it is indicated by a solid line in FIG.
Thus, the upper end of the restraining rod 94 is connected to the second engaging portion of the intermediate wall 93c.
93d to move forward two steps by the restraining rod 94.
Of the steering wheel is released.
The direction in which the holding frame 62 is turned to the front side of the body 1
When the vehicle 1 travels in the state, the traveling speed change lever 11
Is switched to the forward two-stage F2,
High speed danger due to backing at high speed
The switching of the -11 to the second forward stage F2 is suppressed.
In this case, the restraining rod 94 is moved from the second engagement portion 93d.
Lift it up to disengage it and show it in phantom in FIG.
So that the upper end of the restraining rod 94 is hooked on the first engagement portion 93b.
It is a replacement. Thereby, the lower end of the restraining rod 9
Is located when the rear end 57b of the operation piece 57 is in the second forward stage.
Operating position of the traveling speed change lever 11 and
Even when switching to the second stage, the rear end of the operation piece 57 is
The traveling speed shift shaft 41 abuts on the lower end of the restraining rod 94.
Is prevented from moving to the second forward stage F2. In the above embodiment, the PTO shaft switching device
The power to the PTO shaft 16 is two-stage
Work shift to switch between high and low two-stage reverse and neutral position
Although the device was used, as this PTO switching device 17
Is not limited to work transmissions at all.
For example, a work on / off device for simply turning on / off the power to the PTO shaft 16
It may be used as a PTO axis switching device.
In this case, the work on / off lever of this work on / off device
The aforementioned control is provided between the operation lever and the traveling speed change shift shaft 41.
The body 80 may be interposed. [0030] As described above, according to the present invention, the traveling speed change
LevaInTravel shiftAxisReverseStep by stepRun backward
Operation lever-Enter by mistake and P
TOOn the axisWhen trying to drive a linked work machine
Is a traveling shift shift of the traveling transmission.On the axisControls provided
On the bodyThe traveling speed shiftAxisNeutralIn placeBack and back
The traveling can be stopped, and the work operation lever can be stopped.ーOperation position
, The traveling gear leverInTravel shiftAxis
Accidentally reverseStep by stepWhen the switching operation is performed, the control
The work operation lever-Return to the cutting position and stop the implement
As a result, the work machine can be
Eliminates reverse running and allows the worker to
DataPlace ofPrevents getting caught in rotary claw
To ensure the safety of workers
Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view of a main part of a management device according to the present invention. FIG. 2 is an explanatory diagram of a state in which the work operation lever is operated to a forward rotation low speed position. FIG. 3 is a vertical sectional side view of the main part. FIG. 4 is a side view showing the overall structure of the management device according to the present invention. FIG. 5 is a partially omitted plan view of the fuselage. FIG. 6 is a cross-sectional explanatory view in which the power transmission mechanism is appropriately developed. FIG. 7 is a schematic side sectional view of a power transmission mechanism. FIG. 8 is a partially cutaway side view showing a mounted state of the traveling speed change lever. FIG. 9 is a vertical sectional view of a position holding mechanism of the traveling speed change shift shaft. FIG. 10 is a vertical sectional view of a position holding mechanism of a work machine forward / reverse shift shaft. FIG. 11 is an explanatory diagram of an operation mechanism of a sub-transmission shift shaft. FIG. 12 is a plan view of a spacer. [Description of Signs] 11: Traveling transmission lever, 12: Traveling transmission, 15; Work operation lever, 17; PTO shaft switching device, 41; Traveling transmission shift shaft, 80;

Continuation of the front page (72) Inventor Eiji Yamazaki 5-32-7 Sendagaya, Shibuya-ku, Tokyo Inside Ishikawajima Shibaura Machinery Co., Ltd. (56) References JP-U 1-150132 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A01B 71/02 A01B 33/08

Claims (1)

(57) Claims: 1. A shaft rectangular in conjunction with the operation of the travel gear levers
Forward gear and reverse via the driving gear shift shaft to be moved to the direction
And the traveling transmission to switch to the stage, the operation of the work operation levers
Ri Mi and PTO shaft switching retrofit location to turn on and off the power to the PTO shaft
In the management apparatus provided in the Tsu Deployment case, the work Misao
Operation lever travels outside one side of the transmission case
Shift are swung freely supported on the shift shaft, said travel gear shift axis, when said travel gear shift shaft is positioned in the reverse gear, the working operation lever by input operation of the working operation levers
Back to the neutral position location the travel gear shift shaft interferes with over,
When the working operation levers are in the operating position, the working operation lever interferes with the work operation levers by switching operation to the reverse gear of the travel gear shift shaft by the traveling speed change levers
Tiller, characterized in that it comprises a control member to return the over to OFF position.