JPH09205853A - Operation device of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an operator who maneuvers the working vehicle to easily operate a maneuvering operation member. SOLUTION: A swing type working vehicle V which has a swing vehicle body 2 supported on a traveling vehicle body 1 so that it freely swings to the right and left has a step 56 where the operator stands behind the swing vehicle body 2 and a guard member 61 that the operator standing on the step 56 grips. The guard member 61 is positioned in front of the step 56, and formed into a quadrilateral shape having a front pipe 611 , a rear pipe 612 , a left pipe 613 , and a right pipe 614 . Nearby maneuvering operation members such as the guard member 61, a throttle lever 102, an operation machine elevation/vehicle body swing lever 103, a kill switch 104, an HST operation lever 105, a clutch lever 106 are arranged, and those maneuvering operation members can be operated without putting the hand greatly away from the guard member 61.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for a work vehicle, in which a machine body attached to a traveling vehicle body is provided with a driver's operating part and a guard member which is located in the operating part and can be gripped by the operator's hand. Regarding

[0002]

2. Description of the Related Art As a work vehicle provided with a guard member in front of a driving section where a worker is located during driving, Japanese Patent Application Laid-Open No. Hei 5-97.
The one described in Japanese Patent Publication No. 049 is known.

This work vehicle is provided with steering clutch levers on the grips of the left and right handles provided so as to be located on the left and right sides of the guard member, and the operation levers for the working machine are provided on the instrument panel between the left and right handles. Is equipped with.

[0004]

SUMMARY OF THE INVENTION In the conventional work vehicle described above, when an operator attempts to operate a work machine operation lever provided on an instrument panel in order to perform a steering operation while holding a handle, There is a problem in that workability is poor because it is necessary to move the handle away from the handle and move it to the work machine control lever.

The present invention has been made in view of the above circumstances, and an object thereof is to allow an operator who operates a work vehicle to easily operate a steering operation member.

[0006]

In order to achieve the above object, the invention described in claim 1 is a machine body attached to a traveling vehicle body, a driver's section for workers, and a work located in the driver's section. An operating device for a work vehicle provided with a guard member that a person grips by hand, wherein the guard member is directed toward the worker from a front member extending in the left-right direction in front of the worker and both left and right ends of the front member. And at least left and right side members extending rearward, and a steering operation member is arranged in the vicinity of the guard member.

In addition to the structure of claim 1, the invention described in claim 2 is a step in which the operating portion is a step, and the rear end of the guard member is arranged in front of the vicinity of the front end of the operating portion. As a result, a space in which a worker standing in the driving section can move is formed.

The invention described in claim 3 is characterized in that, in addition to the structure of claim 1, the machine body is pivotally supported on the traveling vehicle body so as to be swingable right and left via a swing shaft.

According to a fourth aspect of the present invention, in addition to the structure of the first aspect, the operating section is a step, and the operating section extends horizontally and a rear portion from the rear end of the horizontal section. And an inclined portion extending upward.

The invention described in claim 5 is characterized in that, in addition to the structure of claim 1, the operating part is supported by the machine body through an elastic member.

According to a sixth aspect of the present invention, in addition to the structure of the first aspect, a traveling operation lever having at least a traveling position, a neutral position and a parking position is provided, and the traveling operation lever is operated to the parking position. It is characterized in that the parking brake device of the traveling vehicle body is actuated when this is done.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 11 show an embodiment of the present invention. FIG. 1 is an overall side view of an oscillating work vehicle, and FIG. 2 is FIG.
5 is a two-direction arrow view (overall plan view), FIG. 3 is a three-direction arrow view of FIG. 1 (overall rear view), FIG. 4 is a view showing a frame structure and a power transmission system of a rocking type work vehicle, and FIG. 5 is a sectional view taken along line 5-5 of FIG. 4, FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. 1, FIG. 7 is an enlarged view of portion 7A and 7B-7B of FIG. 1, and FIG. 9 is a hydraulic circuit diagram, FIG. 10 is an operation explanatory view, and FIG. 11 is an operation explanatory view.

As shown in FIGS. 1 to 5, the swing type work vehicle V (hammer knife mower in the embodiment) is a traveling vehicle body 1.
And a swinging body 2 pivotally supported on the traveling vehicle body 1 so as to be swingable left and right around a longitudinal axis, and a working machine 3 pivotally supported at a front end of the traveling vehicle body 1 so as to be vertically swingable about a lateral axis. Equipped with.

The traveling vehicle body frame 4 constituting the skeleton of the traveling vehicle body 1 includes first, second and third cross members 4 ₁ , 4 ₂ and 4 ₃ arranged in the left-right direction and first and second cross members. Two left side members 4 _4L and 4 _5L connecting the left end portions of 4 ₁ and 4 ₂ to the front and rear, and the first and second cross members 4 ₁ and 4
_Two right side members 4 that connect the right end of ₂ to the front and back
_4R, comprising 4 and _5R, a second, third cross member 4 _2, 4 ₃ connecting to the front and rear pair of left and right rear side members 4 _6L, 4 _6R.

On both left and right sides of the traveling vehicle body frame 4,
6 lower guide rollers 5 are provided on the lower surface of the
The upper guides are
Are provided. Left and right front of the traveling body frame 4
At the end, a pair of springs 7, 7 are urged forward.
The tension roller support rods 8 and 8 are supported,
At the tip of these tension roller support rods 8,
Tension rollers 9 and 9 are provided respectively. Running car body
A pair of hydraulic motors M are provided at the left and right rear portions of the ram 4._L, M_RBut
Installed and hydraulic motors M_L, M_ROut of
The power shafts 10, 10 are provided with sprockets 11, 11.
You. The lower guide roller 5 and the upper guide roller
Rollers 6,6, tension rollers 9,9, and sprocket
A pair of left and right crawlers 12_L, 12_RBut
Wrapped around, left and right traveling device D _L, D_RIs composed
You.

By driving the left and right hydraulic motors M _L and M _R , the left and right crawlers 12 _L and 12 _R rotate independently through the sprockets 11 and 11, whereby the rocking type work vehicle. V runs and turns. At this time, a predetermined tension is applied to the left and right crawlers 12 _L and 12 _R by urging the tension rollers 9 and 9 forward by the springs 7 and 7.

The swinging body frame which constitutes the skeleton of the swinging body 2
The dome 13 is arranged in the left-right direction on the front side of the vehicle body.
1, 2nd cross member 13₁, 13_TwoAnd on the rear side of the vehicle
And the third and fourth cross members 13 arranged in the left-right direction
_Three, 13_FourAnd the first and second cross members 13₁, 13_Two
Left and right ends of the third and fourth cross members 13_Three, 13_Fourof
A pair of left and right first side members 13 connected to the left and right ends
_5L, 13_5RAnd a pair of left and right second side members 13_6L, 1
3_6RAnd the first and second cross members 13₁, 13 _TwoLeft and right
Connect both ends and extend upward, bend backward from there and
A pair of left and right third side members 1 extending to the lower back of the body
3_7L, 13_7RAnd the third and fourth cross members 13_Three, 13
_FourThe left and right ends of the
3 side members 13_7L, 13_7RLeft connected to the middle part of
Right pair of fourth side members 13_8L, 13_8RAnd the left and right
A pair of third side members 13_7L, 13_7RLeft and right
Fifth cross member 13 to connect₉And the pair of left and right
3 side members 13_7L, 13_7RAnd a pair of left and right fourth die
Member 13_8L, 13_8RU-shaped button in plan view
Net support stay 13_TenAnd

As is apparent from FIG. 4, a bevel gear box 14 is erected on the upper surface of the central portion in the left-right direction of the first cross member 4 ₁ of the traveling vehicle body frame 4 formed in a rectangular frame shape. On the other hand, a bracket 15 is erected on the upper surface of the first cross member 13 ₁ of the swing body frame 13, and the bracket 15 and the bevel gear box 14 are connected via a front swing shaft 16 extending in the front-rear direction. To be done. Further, a bracket 17 standing on the upper surface of the third cross member 13 ₃ of the swing body frame 13 and a bracket 18 standing on the upper surface of the second cross member 4 ₂ of the traveling body frame 4.
And are connected by a rear swing shaft 19 extending in the front-rear direction.

The front swing shaft 16 and the rear swing shaft 19 are coaxially arranged, and the heights of both swing shafts 16 and 19 are lower than the center of gravity G of the swing body 2. Has been done. Therefore, when the swing body 2 swings to the left around the swing shafts 16 and 19, the center of gravity position G is biased to the left side with respect to the traveling body 1, and when swinging to the right, the center of gravity position G changes to the traveling body 1. To the right (see FIG. 10). The maximum swing angle θ of the swinging vehicle body 2 is set to 30 ° on the left and right sides in this embodiment.

[0021] As apparent from FIG. 3, the output rod 22 of the second cross member 4 ₂ body swing cylinder 22 which is supported through a bracket 21 to the vehicle body frame 4
₁ is connected to the tip of an arm 23 fixed to the bracket 17 of the swing body frame 13. Therefore, when the vehicle body swinging cylinder 22 is contracted and driven, the swinging vehicle body 2 becomes the traveling vehicle body 1
To the left with respect to the vehicle body swing cylinder 22
When the vehicle is extended, the swinging vehicle body 2 swings to the right with respect to the traveling vehicle body 1.

As is apparent from FIG. 4, an engine 32 having a crankshaft 31 arranged in the front-rear direction is mounted at a position on the right side of the center line of the swing body 2, and a pump shaft 33 is arranged on the left side of the engine 32 in the front-rear direction. The pump unit 34 arranged in the direction is arranged. Pulley 3 provided on the crankshaft 31
5 and the pulley 36 provided on the pump shaft 33 are connected to the endless belt 3
By connecting with 7, the pump unit 34 is driven by the driving force of the engine 32. It is also possible to coaxially arrange three sets of transmissions including the pulleys 35 and 36 and the endless belt 37 in parallel and close to each other.

The pump unit 34 is a swash plate type variable discharge.
Left side hydraulic pump P consisting of volumetric hydraulic pump_LAnd hydraulic pressure on the right side
Pump P_R, Charge pump 38, work machine lift / car
The body swing pump 39 is connected in series. Left hydraulic pressure
Pump P_LIs the left hydraulic motor M_LFlexible to
Piping 40₁, 40_TwoConnected through the right side
Hydraulic pump P_RIs the right hydraulic motor M_RFlexi to
Ru piping 41₁, 41 _TwoConnected via Therefore,
Left and right hydraulic pumps P_L, P_RSet the same discharge oil amount
Left and right hydraulic motors M_L, M_RRotate at the same speed
The rocking type work vehicle V travels straight, and the left and right hydraulic pumps
P_L, P_RIf there is a difference in the amount of oil discharged from the
Ta M_L, M_RRocking type work vehicle V rotating at different speeds
Turns. Left and right hydraulic motors M_L, M_RAnd left and right oil
Pressure pump P_L, P_RIs a hydrostatic continuously variable transmission (HST)
Configure.

As is apparent from FIGS. 1 and 2, the muffler 42 is arranged above the engine 32, and the battery 43 is arranged above the muffler 42. A radiator 44 is disposed behind the engine 32, and a radiator fan 45 that supplies cooling air to the radiator 44 is disposed between the radiator 44 and the engine 32. An HST filter 46 is arranged above the pump unit 34, and an air cleaner 47 is arranged above the HST filter 46. Further, an HST oil tank 48 is disposed behind the radiator 44, and the HST oil tank 4 is provided.
A fuel tank 49 and a digester S are arranged behind 8 respectively.

The swing vehicle body 2 is provided with a bonnet 50 that covers the upper surface of the front portion thereof and a pair of side covers 51 _L and 51 _R that covers the left and right sides of the rear portion. As shown in FIG. 7 (A), the front end of the bonnet 50 is attached to the brackets 52, 52 welded to the front ends of the left and right third side members 13 _7L , 13 _7R of the swing body frame 13 via hinges 53, 53. Be pivoted. Further, as shown in FIG. 7 (B), bifurcated elastic clips 55, 55 are provided on the left and right rear portions of the bonnet 50 via brackets 54, 54, and these elastic clips 55, 55 are the swing body frame. The bonnet support stay 13 ₁₀ of 13 can be engaged.

Therefore, when the rear part of the bonnet 50 is lifted upward, the elastic clips 55, 55 are disengaged from the bonnet support stay 13 ₁₀ , and the bonnet 50 is moved to the hinge 5 at the front end.
By swinging forward around 3, 53, the engine 32 and auxiliary equipment can be maintained. When the bonnet 50 is swung backward, the elastic clips 55, 55
Automatically engages the bonnet support stay 13 ₁₀ to hold the bonnet 50 in the closed position. As a result, the bonnet 50 is openably and closably supported with a simple structure using the members and stays of the swing body frame 13.
Maintenance within 0 can be easily performed.

Further, since the engine 32 and its accessories (including the battery 43), the hydraulic drive device and its accessories are arranged in the bonnet 50 so as to be laterally distributed, it is possible to effectively use the space in the bonnet 50. Instead, the center of gravity of the swinging vehicle body 2 can be brought closer to the swinging shafts 16 and 19 to enable smooth swinging. In particular, swing body 2
Since the upper part of the vehicle is extended in the left-right direction and various types of mounted objects are stored therein, the total length of the vehicle body can be shortened as compared with the case where the mounted objects are arranged in the front-rear direction.

Further, an air cleaner 47 is installed on the radiator 44 from the rear side, and an engine cleaner 32 is installed in front of the radiator 44.
Of the muffler 42, the battery 43 on the muffler 42, the hydraulic drive system on the left side of the engine 32, the HST oil tank 48 above the hydraulic drive system, and the front of the engine 32 and the hydraulic drive system. The belt transmission systems are respectively arranged, the air cleaner 47 is the highest in the rear view, the battery 43 is provided in the position in front of the air cleaner 47 and lower than the air cleaner 47, and the bonnet 50 is a forward slant nose along the upper ends thereof. Therefore, the visibility of the operator is improved and the work performance is improved.

On the left and right side surfaces of the bonnet 50, netted windows 50 ₁ and 50 ₁ are formed. These windows 50 ₁ and 5 ₁
It is possible to supply air to the air cleaner 47 through 0 _{1 and} to promote ventilation in the bonnet 50 to enhance the cooling effect of heat generating objects such as the engine 32 and the muffler 42.

The left and right lower side surfaces of the rocking vehicle body 2 are covered with side plates (not shown), and openings for heat dissipation are formed at appropriate places on the side plates (for example, the portion covering the muffler 42). Side covers 51 _L , 5 provided at the rear of the swing body 2
On top of 1 the fuel disposed between _R tank 49, rear opening 62 for communicating the interior space of the swing body 2 to the outside is formed (see FIGS. 1 and 3). A front opening 63 that communicates the internal space with the outside is formed in the front portion of the swinging vehicle body 2, and the front opening 63 is covered with a wire net 64 (see FIG. 5). Thus, since the internal space of the swing vehicle body 2 is formed in a tunnel shape having the rear opening 62 and the front opening 63, the ventilation effect is enhanced, and the engine 32, the radiator 44, and the muffler 42 arranged therein are provided. Etc., the cooling performance is improved.

The radiator fan 45 for supplying cooling air to the radiator 44 arranged in the internal space of the swinging vehicle body 2 is of a suction type, and the cooling air taken in from the rear opening 62 is passed from the rear surface of the radiator 44 to the front surface. After that, it is discharged to the outside through the front opening 63. Therefore, in combination with the provision of the wire net 64 in the front opening 63, it is possible to reliably prevent the grass mowed by the working machine 3 from being sucked into the internal space of the swing vehicle body 2.

As shown in FIGS. 1 and 2, the hood 5
A control device for controlling the rocking type work vehicle V is arranged between the left and right side covers 51 _L and 51 _R that are continuous to the rear of 0. The swing-type work vehicle V is maneuvered in a standing posture by a worker, and a step 56 for the worker to stand is provided at the rear end of the vehicle body. Step 56 is the horizontal part 5 on the front side.
6 ₁ and a slanted portion 56 ₂ that extends from the rear end of the horizontal portion 56 _{1 to} the rear upper side, and is formed of a plate body having an inverted V-shaped cross section. Third
The side members 13 _7L and 13 _7R are pivotally supported at the rear ends of the side members 13 _7L and 13 _{7R so} as to be swingable back and forth via hinges 57 and 57 having rubber bushes.

On the lower surface of step 56, a bracket 58,
Rubber stoppers 59, 59 are provided via 58, and when the step 56 is in a use position extending substantially rearward, the rubber stoppers 59, 59 are provided at the rear ends of the left and right third side members 13 _7L , 13 _7R . The step 56 is abutted to position the step 56 in the use position. Thus, step 56
Is supported via hinges 57, 57 having rubber bushes and rubber stoppers 59, 59, the vibration of the engine 32 is less likely to be transmitted to the worker, and the workability can be improved.

Step 56 is the hinge 5 when not in use.
It can be stored by swinging upward through 7, 57. At this time, the hook 60 provided at the rear end of the step 56 is locked to the guard member 61, which will be described later, so that the step 56 can be held in the storage position.

Next, the structure of the working machine 3 will be described with reference to FIG. 6 in addition to FIGS.

The working machine 3 is for performing a mowing operation, and includes a working machine cover 65, a working machine rotating shaft 66 which is installed in the working machine cover 65 in the left-right direction, and a working machine rotating shaft 66. A plurality of hammer knives 67 radially supported on the outer periphery of the work protector, a movable protector 69 pivotally supported on the front part of the work machine cover 65 via a pair of left and right arms 68, 68, and a work machine. A fixed protector 70 is provided upright on the cover 65, and a pair of left and right sleds 71, 71 supported on the lower surface of the working machine cover 65.

The working machine 3 is pivotally supported on the front part of the traveling vehicle body 1 via a working machine supporting mechanism 72 so as to be vertically swingable. The working machine supporting mechanism 72 is a first cross member of the traveling vehicle body frame 4. 4 comprises a _first working machine elevating shaft 74, 74 supported in a U-shaped bracket 73 which is open to the pair of left and right front erected on the upper surface. A pair of left and right work machine support arms 75, 75 supporting the work machine cover 65 are pivotally supported on the work machine lifting shafts 74, 74 so as to be vertically swingable, and a pair of left and right lifting drive arms 76, 76 are provided. It is pivotally supported independently of the working machine support arms 75, 75 so as to be vertically swingable. The front ends of the left and right lifting drive arms 76, 76 are integrally connected by a connecting member 77 extending in the left-right direction, and a working machine lifting cylinder 79 supported by a bracket 78 provided on the front surface of the first cross member 4 _1. output rod 79 ₁ of is connected to the central portion to the connecting member 77.

The front ends of the left and right work implement support arms 75, 75 are in contact with the front ends of the left and right lifting drive arms 76, 76, and upper stoppers 80, 80 and lower stoppers 81,
81 are provided. Since the work implement support arms 75, 75 are urged downward by the weight of the work implement 3, the upper stopper 8 provided on the work implement support arms 75, 75 is normally used.
0 and 80 are in contact with the upper surfaces of the lifting drive arms 76 and 76. At this time, the lower surfaces of the lifting drive arms 76, 76 and the lower stopper 8 provided on the work machine support arms 75, 75
Gaps α, α are formed between the two and 1, 81 (see FIG. 6). The gaps α, α can absorb an unexpected upward movement of the working machine 3 and prevent a large load from being applied to the working machine lifting cylinder 79.

A pulley 94 provided at the rear end of the front swing shaft 16
The pulley 95 provided at the front end of the pump shaft 33 is connected by an endless belt 96. It is also possible to arrange three sets of the transmission devices including the pulleys 94 and 95 and the endless belt 96 in parallel and in close proximity to each other and coaxially. The left end of a rotary shaft 82, which is supported by the bevel gear box 14 coaxially with the work machine lifting shafts 74, 74, is connected to the front end of the front swing shaft 16 via a bevel gear group 83. The two bevel gears on the opposite side, which face the rotary shaft 82 and the front swing shaft 16, may be omitted.

A pulley 85 provided at the left end of a rotary shaft 84 provided in the right and left direction on the right side of the upper surface of the working machine cover 65 and a pulley 86 provided at the right end of the rotary shaft 82 are connected by an endless belt 87. A tension pulley 89 of a belt tension clutch is arranged inside a belt case 88 that covers the belt 87. When the tension pulley 89 is pressed against the endless belt 87, the driving force of the rotary shaft 82 is transmitted to the rotary shaft 84. A pulley 90 provided at the right end of the work machine rotating shaft 66 and a pulley 91 provided at the right end of the rotating shaft 84 are connected by an endless belt 92.
The belt 1 and the endless belt 92 are covered by a belt case 93 provided on the right side surface of the working machine cover 65. Above pulley 8
It is also possible to arrange three sets of transmission devices, which are composed of 5,86;

The rotation of the crankshaft 31 of the engine 32 is caused by the pulley 35, the endless belt 37, the pulley 36, the pump shaft 33, the pulley 95, the endless belt 96, and the pulley 9.
4, front swing shaft 16, bevel gear group 83, rotary shaft 82,
Pulley 86, endless belt 87, pulley 85, rotating shaft 8
4, the pulley 91, the endless belt 92, and the pulley 90, and is transmitted to the working machine rotary shaft 66, and the hammer knife 67 ...
Is rotationally driven in the direction of the arrow in FIG.

As shown in FIGS. 1 and 2, the guard member 61 provided at the rear portion of the swing vehicle body 2 includes a front pipe 6
11 ₁ , a rear pipe 61 ₂ , a left pipe 61 ₃ and a right pipe 61 ₄ are formed in a quadrangular shape in a plan view, and the front portion is attached so as to be higher than the rear portion. An instrument panel 101 arranged below the guard member 61 includes a throttle lever 102, a working machine lifting / body swing lever 103, and a kill switch 104.
, HST operation lever 105, work clutch lever 106, emergency kill switch 104K, and worker belt 104O connected to the emergency kill switch 104K
Are provided.

The rear end of the guard member 61 is located in front of the vicinity of the front end of the step 56. Therefore, the guard member 51 does not get in and out of the step 56 and does not interfere with the operator who operates while standing on the step 56.

The throttle lever 102 is a guard member 61.
Is arranged on the left side of the left pipe 61 ₃ of the engine, and when it is operated forward, the rotation speed of the engine 32 increases, and when it is operated backward, the rotation speed of the engine 32 decreases. The work machine lifting / body swing lever 103 is the left pipe 6 of the guard member 61.
It is arranged on the right side of 1 ₃ , and when it is operated back and forth, the working machine lifting cylinder 79 operates and the working machine 3 moves up / down.
Cylinder for rocking the car body 2 when descending and operating it left and right
2 is operated, and the rocking body 2 rocks to the left and right. These throttle lever 102 and working machine lifting / body swing lever 1
03 is a guard member 6 so that the operator can easily operate it with his left hand.
It is arranged near the left pipe 61 ₃ .

The kill switch 104 is operated in an emergency, and the engine 32 is stopped by the operation. The kill switch 104 is arranged in the substantially central portion of the guard member 61 and can be easily operated by either the right hand or the left hand of the operator. The emergency kill switch 104K is attached to the instrument panel 101 below the kill switch 104, and the worker belt 104O is connected to the emergency kill switch 104K. Therefore, the worker standing on the step 56 with the worker's belt 104O attached and performing work traveling or traveling traveling is in step 56.
When it is separated from, the emergency kill switch 104K is pulled out from the kill switch mounting portion and the engine 32 is stopped.

As will be apparent by referring to FIG. 8 together,
The HST operation lever 105 is the right pipe 6 of the guard member 61.
1 ₄ is disposed on the left side, it is operated back and forth along the guide groove 107 of the stepped formed in the instrument panel 101. In the guide groove 107, the neutral position N, the working position D ₁ , the traveling position D ₂ ,
A reverse position R and a parking position P are formed. HST operating lever 105, the operator is disposed in the vicinity of the right pipe 61 ₄ of the guard member 61 so as to be easily operated with the right hand.

HS operated to the parking position P
The T operation lever 105 is locked by a bifurcated spring 108 so as to be stably held at the parking position P. At this time, when the TST operation lever 105 comes into contact with the HST operation lever 105 and the limit switch 109 is turned ON, the operation will be described later.
The position switching valve 116 operates and the left and right hydraulic motors M _L , M
_The parking brake is operated by engaging the multi-plate hydraulic brakes B, B provided on the _R to lock the output shafts 10, 10.

The pressure in the working clutch lever 106 is right pipe 61 ₄ disposed on the right side, the to operate it forward belt tension clutch tension pulley 89 (see FIG. 1) is an endless belt 87 of the guard member 61 Then, the driving force is transmitted to the engine 32 to the working machine 3.
Working clutch lever 106, the operator is disposed in the vicinity of the right pipe 61 ₄ of the guard member 61 so as to be easily operated with the right hand.

Next, the hydraulic circuit will be described with reference to FIG.

On the pump shaft 33 connected to the engine 32
Is the left hydraulic pump P_L, Right hydraulic pump P_R, Charge pon
And the working machine lifting / body swing pump 39 are connected.
And left hydraulic pump P_LIs pipe 40₁, 40_TwoThrough
Left hydraulic motor M_LConnected to the right hydraulic pump
P_RIs pipe 41₁, 41_TwoVia right hydraulic motor M _R
Connected to. The charge pump 38 is an oil for HST
Oil path 111 from tank 48₁Oil pumped through
Oil passage 111_Two, Filter 112 and oil passage 111_Three
40 through₁, 40_Two; 41₁, 41₁Supply to
Pipe 40₁, 40_Two; 41₁, 41_TwoLeak from
To replenish the oil lost by.

The work implement lifting / body swinging pump 39 is an HS
The oil drawn from the T oil tank 48 through the oil passage 113 ₁ is selectively supplied to the vehicle body swing cylinder 22 and the working machine lifting cylinder 79 through the oil passage 113 ₂ . That is, the three-position switching valve 1 including a solenoid valve interposed between the oil passage 113 ₂ and the vehicle body swing cylinder 22.
By switching 14 from the neutral position to one side, the vehicle body swinging cylinder 22 contracts and swings the swinging vehicle body 2 to the left, and by switching from the neutral position to the other side, the vehicle body swinging cylinder 22 extends and swings. The moving body 2 swings to the right. In addition, the oil passage 113 ₂ and the working machine lifting cylinder 79
By switching the three-position switching valve 115 formed of a solenoid valve interposed between the neutral position and the one position, the working machine lifting cylinder 79 contracts to lower the working machine 3, and the working position is switched from the neutral position to the other position. Thereby, the working machine lifting cylinder 79 is extended and the working machine 3 is lifted.

[0052] The charge pump 38 oil passage 111 through which oil is supplied from the _4, the left and right hydraulic motors M _L, M _R multi-plate hydraulic brake B mounted on the side of being connected to the B parking cylinder 117, 117 It Normally, the parking cylinders 117, 117 are in the unlocked position by the hydraulic pressure supplied from the charge pump 38, and the left and right hydraulic motors M
The output shaft 10.10 of _L and M _R can rotate freely. When the HST operation lever 105 is operated to the parking position and the limit switch 109 (see FIG. 8) is turned on, the two-position switching valve 116 formed of a solenoid valve interposed in the oil passage 111 ₄ is switched to the illustrated position,
The oil supplied to the parking cylinders 117, 117 is discharged to the oil tank 110. This allows
The parking cylinders 117, 117 are actuated by the elastic force of the springs provided therein, and the left and right hydraulic motors M
By pressing the brake plates of the multi-disc hydraulic brakes B and B of _L and M _R to lock the rotation of the output shafts 10 and 10, the Perkin brake operates. By thus using the HST operation lever 105 also as the parking lever, the number of parts can be reduced.

Next, the operation of the embodiment of the present invention having the above construction will be described. When the HST operating lever 105 is in the neutral position N or the parking position P, the left and right hydraulic pumps P _L and P _R connected to the HST operating lever 105 via a link mechanism (not shown) are operated. The tilt angle of the swash plate becomes zero.
At this time, the amount of oil discharged from the left and right hydraulic pumps P _L and P _R becomes zero, and the left and right hydraulic motors M _L and M _R do not rotate. Therefore, the swing work vehicle V is stopped. From this state, H
When the ST operation lever 105 is operated to the work position D ₁ , the tilt angles of the swash plates of the left and right hydraulic pumps P _L and P _R are increased by the same amount, and the two hydraulic pumps P _L and P _R supply the same amount of oil. Discharge. The oil discharged from the two hydraulic pumps P _L and P _R causes the left and right hydraulic motors M _L and M _R to rotate at the same speed, so that the left and right crawlers 12 _L and 12 _R are driven at the same speed and the rocking type work vehicle. V runs forward at a low speed suitable for work (corresponding to the maximum speed in work).

The HST operation rail 105 is moved to the traveling position D.
_When operated to ₂ , the tilt angles of the swash plates of the left and right hydraulic pumps P _L and P _R are further increased by the same amount, and both hydraulic pumps P _L and P _R
Discharge amount increases. As a result, the rotational speeds of the left and right hydraulic motors M _L and M _R , that is, the left and right crawlers 12 _L and 12
The driving speed of _R is increased, and the rocking type work vehicle V travels forward at a high speed (corresponding to the maximum speed in traveling on the road) suitable for traveling on the road. When the HST operating lever 105 is operated to the reverse position R, the left and right hydraulic pumps P _L ,
The tilt angle of the swash plate of P _R increases in the opposite direction by the same amount, and both hydraulic pumps P _L and P _R discharge the same amount of oil in the opposite direction. As a result, the hydraulic motors M _L and M _R reversely rotate at the same speed and the swing work vehicle V travels backward.

The HST operation tray 105 is at the working position D.
_{1. When} the rocking type work vehicle V is traveling forward or backward in the traveling position D ₂ or the reverse position R, the throttle lever 102 is operated to operate the engine 3
By adjusting the number of rotations of 2, the traveling speed of the swing work vehicle V can be adjusted.

When the oscillating work vehicle V is traveling forward or backward, rotating the HST operating lever 105 to the right causes the amount of oil discharged from the left hydraulic pump P _L to be increased to the right hydraulic pump P _R. Amount of oil discharged from As a result, the left hydraulic motor M _L (left crawler 12 _L )
Of the hydraulic motor M _R on the right side (the right crawler 12
_R ) and the swing work vehicle V turns right. On the contrary, when the HST operating lever 105 is rotated leftward, the discharge oil amount of the right hydraulic pump P _R becomes larger than the discharge oil amount of the left hydraulic pump P _L. As a result, the rotation speed of the right hydraulic motor M _R (right crawler 12 _R ) becomes higher than the rotation speed of the left hydraulic motor M _L (left crawler 12 _L ), and the swing work vehicle V turns left. To do.
It should be noted that if the left and right hydraulic motors M _L and M _R are stopped, it is possible to make a turning turn. Swing operation of the swing vehicle When the swing work vehicle V travels on a flat ground that is not inclined in the left-right direction, as shown in FIG.
On the other hand, the swing vehicle body 2 is kept in a parallel non-inclined state. Further, as shown in FIG. 10 (B), when traveling on a slope descending to the right, the working machine lifting / body swing lever 103 is operated to the left to contract the vehicle swing cylinder 22 by a predetermined amount, The rocking vehicle body 2 can be rocked to the left around the front rocking shaft 16 and the rear rocking shaft 19 with respect to the traveling vehicle body 1, and the rocking vehicle body 2 can be held in a horizontal posture. On the contrary, as shown in FIG. 10C, when traveling on a slope descending to the left, the working machine lifting / body swing lever 103 is operated to the right to extend and drive the body swing cylinder 22 by a predetermined amount. As a result, the swing body 2 is moved relative to the traveling body 1 by the front swing shaft 1
6 and the rear swing shaft 19 can be swung to the right to hold the swing vehicle body 2 in a horizontal posture. Although this horizontal posture is manually controlled by the operator by his / her own sense, it is also possible to automatically maintain the horizontal posture by using the horizontal sensor.

As described above, the swing vehicle 2 is moved to the traveling vehicle 1
By swinging to the left and right with respect to the horizontal position and holding it in a horizontal position, the worker can keep the body in a vertical position and work in a comfortable position. Not only is it improved, but the operator can easily step off the step 56 to the high side of the slope. Further, by holding the swinging vehicle body 2 in a horizontal posture, it becomes difficult for the swinging vehicle body 2 to interfere with the standing tree T, and grass near the standing tree can be easily mowed (see FIG. 10). Moreover, the engine oil, the radiator liquid, the HST oil, which is caused by the inclination of the swinging body 2,
Since the supply failure of fuel etc. does not occur, the performance and durability of various devices are improved. Further, by swinging the swing vehicle body 2 with respect to the traveling vehicle body 1, maintenance from the side of the vehicle body is easy.

When the rocking car body 2 is rocked in a horizontal posture on a sloping ground, the engine 3 mounted on the rocking car body 2 is rotated.
Since the gravity center position G of a heavy object such as 2 moves to the higher side of the sloping ground, the rocking type work vehicle V is less likely to fall to the lower side of the sloping ground, which enables work on a steep sloping ground.

As is clear from FIG. 10 (A), running
Left and right traveling devices D of the vehicle body 1_L, D _RThe sky formed between
W between the left and right_SThen, the front-back swing shaft 1 of the swing body 2
Horizontal width W below 6,19_LIs the left of the space
W to the right_SSmaller than the front and rear swing axis 1 of the swing body 2
Left and right width W above 6,19_UIs the left of the space
W to the right_SIs bigger than This makes the swing
The lower part of the vehicle body 2 is a left and right traveling device D_L, D_RInterfere with
The rocking body 2
The capacity of the upper part of the engine is expanded to mount the engine 32 and auxiliary equipment.
Makes it easy and secures a circulation space for the cooling air inside the swing body 2.
To enhance the cooling effect of heat generating objects such as the engine 32.
it can.

When the oscillating work vehicle V travels on a flat ground which is not inclined in the front-rear direction, the worker stands on the horizontal portion 56 _{1 at} step 56 as shown in FIG.
With both hands, the left pipe 61 ₃ and the right pipe 6 of the guard member 61
Grasping 1 ₄ and maneuvering. Further, when traveling on a sloping ground which descends to the front, the worker can support the weight on the guard member 61, and thus can take the same work posture as when traveling on the flat ground. On the other hand, the swing work vehicle V
If There traveling a slope before rising, as shown in FIG. 11 (B), the operator stands on the inclined portion 56 ₂ of the step 56, performs a steering grip the pipe 61 ₁ on the guard member 61 with both hands As a result, it is possible to take a stable work posture that does not easily fall backward. When the working clutch lever 106 is operated forward, the tension pulley 89 of the belt tension clutch connected to the working clutch lever 106 via a Bowden cable (not shown) is pressed against the endless belt 87, The rotation of the pulley 86 is transmitted to the pulley 85 via the endless belt 87. As a result, the driving force of the engine 32 is transmitted to the working machine rotating shaft 66, and the hammer knives 67 ... Are rotatably driven. When the rocking type work vehicle V does not use the work machine 3, when the work machine lifting / body swing lever 103 is operated forward to extend and drive the work machine lifting cylinder 79, the working machine lifts left and right. The working arms 76, 76 swing upward around the working machine lifting shafts 74, 74, and the working machine support arms 75, 7 in which the upper stoppers 80, 80 are pressed by the lifting driving arms 76, 76.
5 swings upward, and the work implement 3 rises. Further, when the working machine 3 is used, the working machine lifting / body swing lever 103
When the work machine elevating cylinder 79 is contracted to be driven backwards, the left and right elevating drive arms 76, 76 swing downward around the work machine elevating shafts 74, 74, and the elevating drive arms 76, 76 are moved. The work implement support arms 75 and 75, which are supported by the upper stoppers 80 and 80, swing downward and the work implement 3
Descends.

When the hammer knives 67 are rotated while the working machine 3 is lowered to move the rocking type work vehicle V forward, the working machine cover is inserted through the gap between the movable protector 69 and the ground. The grass taken in 65 is cut by the hammer knife 67. At this time, when the working machine 3 in which the sleds 71, 71 are brought into sliding contact with the ground receives an upward reaction force from the ground, the working machine support arms 75, 75 integrated with the working machine cover 65 are urged upward. The working machine support arms 75, 75 are provided with a gap α formed between the lower stoppers 81, 81 and the lifting drive arms 76, 76,
Since it can swing up and down within the range of α (see FIG. 6), the working machine 3 can move up and down along the uneven surface without any trouble.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, in the embodiment, the guard member 61 is provided with the front pipe 61 ₁ , the rear pipe 61 ₂ , the left pipe 61 ₃ and the right pipe 61 ₄ , but the rear pipe 61 ₂ can be omitted.

[0064]

As described above, according to the invention described in claim 1, the guard member extends in the left-right direction in front of the worker, and the guard member is directed toward the worker from both left and right ends of the front member. Since at least the left and right side members extending rearward are provided and the steering operation member is arranged in the vicinity of the guard member, the operator can easily support the body by grasping the left and right side members with both hands. In addition to being able to prevent the rearward leaning of the body by grasping the front member when the vehicle body leans backward on the uphill, the operator operates the operation member while holding the guard member with both hands. It becomes possible to improve workability.

According to the second aspect of the present invention,
The driving section is a step, and by arranging the rear end of the guard member in front of the vicinity of the front end of the driving section, a space where a worker standing in the driving section can move is formed. There is no obstruction to getting on or off, or obstruction of the operator's control operation.

According to the third aspect of the present invention,
Since the machine body is pivotally supported on the traveling vehicle body so as to be swingable right and left via the swing shaft, it is possible to maintain the machine body horizontally and improve workability even when traveling on a sloping ground inclined in the left-right direction. Not only does it allow the operator to easily descend from the driving section to the high side of the slope.

According to the fourth aspect of the present invention,
The driving unit is a step, and since the driving unit includes a horizontal portion that extends in the horizontal direction and an inclined portion that extends rearward and upward from the rear end of the horizontal portion, when the vehicle body leans backward on an uphill, By standing on the inclined portion of the driving unit, the worker can keep his body vertical and improve workability.

According to the invention described in claim 5,
Since the driving part is supported by the machine body via the elastic member, it is possible to reduce the vibration of the vehicle body transmitted to the operator and improve the riding comfort.

According to the invention described in claim 6,
A travel control lever having at least a travel position, a neutral position, and a parking position is provided, and when the travel control lever is moved to the parking position, the parking brake device of the traveling vehicle body is operated, so that the travel operation lever is operated to properly start the vehicle. Not only can the vehicle be stopped, stopped, and parked (parking), but the traveling operation lever can also be used as the parking lever to reduce the number of parts.

[Brief description of drawings]

FIG. 1 is an overall side view of a rocking type vehicle.

FIG. 2 is a two-direction arrow view of FIG. 1 (overall plan view).

3 is a three-direction arrow view of FIG. 1 (entire rear view).

FIG. 4 is a diagram showing a frame structure and a power transmission system of a rocking type vehicle.

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

FIG. 6 is an enlarged sectional view taken along line 6-6 of FIG. 1;

FIG. 7 is an enlarged view of a portion 7A in FIG. 1 and a sectional view taken along line 7B-7B.

FIG. 8 is an enlarged view of a main part of FIG.

[Fig. 9] Hydraulic circuit diagram

FIG. 10 is an explanatory diagram of an operation.

FIG. 11 is an operation explanatory diagram.

[Explanation of symbols]

1 traveling vehicle 2 oscillating vehicle (machine) 16 front oscillating shaft (oscillating shaft) 19 rear oscillating shaft (oscillating shaft) 56 step (driving part) 56 ₁ horizontal part 56 ₂ inclined part 57 hinge (elastic member) ) 59 rubber stopper (elastic member) 61 guard member 61 ₁ front pipe (front member) 61 ₂ rear pipe (rear end) 61 ₃ left pipe (side member) 61 ₄ right pipe (side member) 102 throttle lever (Steering operation member) 103 Work machine up / down / body swing lever (steering operation member) 104 Kill switch (steering operation member) 105 HST operation lever (steering operation member, traveling operation lever) 106 Clutch lever (steering operation member) 117 Parking Cylinder (parking brake device) B Multi-plate hydraulic brake (parking brake device)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G05G 5/00 G05G 5/00 D // B62D 11/08 B62D 11/08 C

Claims (6)

[Claims] 1. An airframe (2) attached to a traveling vehicle body (1)
The operator's operating part (56) and the operating part (56)
A guard member (61) that can be gripped by the operator
An operating device for a digitized work vehicle, wherein the guard member (61) is arranged in front of the worker in the left-right direction.
Extending front member (61 ₁) And the front member (61₁) Left
Left and right side members extending rearward from the right ends toward the worker
(61_Three, 61_Four) And at least
In the vicinity of the cord member (61), the steering operation member (102-10
6) An operating device for a working vehicle, wherein the operating device is arranged. 2. The operating unit (56) is a step,
By arranging the rear end (61 ₂ ) of the guard member (61) in front of the vicinity of the front end of the operating part (56),
The operating device for a work vehicle according to claim 1, wherein a space in which a worker standing on the driving part (56) can move is formed. 3. The work vehicle according to claim 1, wherein the machine body (2) is pivotally supported on the traveling vehicle body (1) via a swing shaft (16, 19) so as to be swingable left and right. Operating device. 4. The operating unit (56) is a step,
The operation part (56) has a horizontal part (5
6 _1), characterized by comprising an inclined portion extending rearward and upward (56 ₂₎ from the rear end of the horizontal portion (56 _1), the operation device for a working vehicle according to claim 1. 5. The operating device for a work vehicle according to claim 1, wherein the operating unit (56) is supported on the machine body (2) through elastic members (57, 59). 6. A travel operation lever (105) having at least a travel position, a neutral position and a parking position is provided, and the travel operation lever (105).
The operating device for a working vehicle according to claim 1, wherein the parking brake device (B, 117) of the traveling vehicle body (1) is actuated when the vehicle is operated to the parking position.