JPH10175521A - Walking type agricultural work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow parking on a slope by providing brake devices capable of being switched to a state that plate-like bodies are coupled with the lugs of travel wheels to restrain the rotation of the travel wheels and to a state that the plate-like bodies are not coupled with the lugs of the travel wheels not to restrain the rotation of the travel wheels on wheel supporters. SOLUTION: A plate-like brake plate 151a is rotatably fitted on the upper side of the front end section of a chain case 6, and a spring 151b moved over a fulcrum when the brake plate 151a is rotated is stretched between the middle section of the brake plate 15 1 a and the chain case 6 to form this brake device 151. The brake plates 151a are located in parallel with the chain cases 6 at the time of working. When the brake plates 151a are rotated outward into contact with the outer periphery front end sections of the wheels 7 at the time of parking, the brake plates 151a are coupled with the lugs 7a of the wheels 7, and the rotation of the wheels 7 is restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking type agricultural machine having a parking brake device.

[0002]

2. Description of the Related Art A walk-behind rice transplanter is used in a paddy field, and even if the work is interrupted and the machine is parked in the paddy field, there is no possibility that the machine will start to move naturally. ,
The walking rice transplanter was not provided with a braking device for parking.

[0003]

However, sometimes it is necessary to park the walking rice transplanter on an inclined road or the like. In addition, when a person or an object collides with the parked walking rice transplanter, the body may start moving and lead to an accident. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a parking brake device suitable for an agricultural work machine such as a walking rice transplanter. Since the parking brake device is used only as an auxiliary device, a device that is too large and expensive is not appropriate, and a device that can be provided at a low cost with a simple structure is preferable.

[0004]

In order to solve the above problems, the present invention has the following arrangement. That is, the walking-type agricultural working machine according to the present invention is a walking-type agricultural working machine in which left and right running wheels are respectively attached to the distal end of a wheel support that is rotatably provided so that the tip side moves up and down on both left and right sides of the body. The state is switched between a state in which the plate-like body engages with the lug of the traveling wheel to restrict the rotation of the traveling wheel, and a state in which the plate-like body does not engage with the lug of the traveling wheel and does not restrict the rotation of the traveling wheel. A possible braking device is provided on the wheel support.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a walking type rice transplanter shown in the drawings will be described.

In this walking type rice transplanter 1, a transmission case 2, an engine 3, a hydraulic unit 4, a hydraulic pump 5 and the like are arranged at the front of the body, and a cylinder protruding laterally from a side surface of the transmission case 2. The bases 6a, 6a of the chain cases 6, 6, which are wheel supports, are rotatably fitted to the parts 2a, 2a, and traveling wheels 7, 7 for paddy fields are mounted on the rear end of the chain case.
Is supported. On the back of mission case 2,
The front end of the main frame 9 extending rearward is fixedly connected. The main frame 9 is curved upward at an intermediate portion, and a transmission case 12 for transmitting the seedling table 13 and the planting devices 14 is provided at a position slightly forward of the curved portion. A steering handle 17 and a lever guide 18 are attached to the rear end of the main frame 9.

The seedling mounting table 13 is provided so as to be inclined so that the front portion is at a low position, is slidably supported left and right by a support rail 20 and rollers 21, and reciprocates left and right by a lateral feed mechanism in the transmission case 12. It works.
Side view L-shaped seedling receiving plate 2 integrally formed with support rail 20
The seedlings at the bottom of the seedling mounting table 13 are received by the second
The seedlings 3 are reciprocated right and left to supply seedlings one by one to the seedling outlets 23 of the seedling receiving plate 22. When all the seedlings at the lowermost stage are supplied, the belt-type seedling feeders 24, 24 provided at the lower portion of the seedling mounting table 13 operate, and the seedlings on the stage are sent downward by one stage.

The planting devices 14 are provided on both left and right sides of the transmission case 12, respectively. The planting device 14
Implant 3 supported by crank 30 and link 31
The seedling table supplied to the seedling outlet 23 moves up and down along a predetermined trajectory by the rotation of the crank 30 and the implantation claw 33 provided at the tip of the implantation tool 32. 13 seedlings are planted on the topsoil of the field.

The handle 17 has a substantially U-shape in plan view, and grips 40, 40 are attached to left and right ends thereof. Below the grips 40, 40, side clutch levers 41, 41 for disengaging the side clutches 95, 95 described later, are provided. A thumb-operated main clutch lever 42 for engaging and disengaging a main clutch 75, which will be described later, is provided inside the right grip 40. Inside the left grip 40, a thumb-operated planting / elevating lever 43 for performing on / off operation of the planting clutch 111 and elevating operation of the machine body is provided. Also, lever guide 1
Reference numeral 8 is provided with a main switch, a sensitivity adjusting lever for adjusting the sensitivity of elevating control and rolling control described later, and the like.

[0010] A float 60 for leveling the seedlings to be planted by the planting devices 14, 14 is provided below the body.
The float 60 has a rear portion supported by a pivot shaft 62 at the front end of a float support arm 61, and the front portion moves up and down in accordance with unevenness of the topsoil surface. The float support arm 61 is integrally attached to a rotatable float support bar 63, and the support height of the float 60 is changed by rotating the float support bar 63 by the planting depth adjustment lever 64, thereby changing the height. This controls the planting depth of the seedlings. Hanging link 6 attached to the front of the float 60
A pin 66 provided on the outer surface of the transmission case 2 is loosely fitted in the long hole 65a of the fifth, so that the front part of the float 60 does not fall below a certain angle (the angle shown in FIG. 2).

Next, the transmission configuration of the walking rice transplanter 1 will be described (see FIG. 5).

The engine output taken out to the engine output shaft 70 is transmitted from a gear 71 of the output shaft to a gear 74 of a main clutch shaft 73 via a double gear 72. Gear 74
Is rotatably mounted on the clutch shaft 73 so that transmission from the gear 74 to the main clutch shaft 73 can be turned on and off by the main clutch 75. Main clutch 75
The shifter arm 76 is connected to the main clutch lever 42 by a wire 77.

A safety switch 78 interlocking with the shifter arm 76 is provided. The safety switch 78 is turned on when the shifter arm 76 is turned to the main clutch "off" side, and the engine can be started only when the switch is turned on. Safety switch 78
Is provided, it is possible to prevent a situation in which the engine is started in a state where the main clutch is "engaged" and the body suddenly starts. It is preferable that the safety switch 78 be provided not on the lever side but on the shifter side as in this example, because the weight balance between the front and rear is good and the wiring and the like are short.

Two traveling speed change gears 80 and 81 and a back gear 82 are mounted on the main clutch shaft 73. When the traveling transmission gear 80 meshes with the gear 85 of the traveling gear shaft 84, the forward speed becomes high, and when the traveling transmission gear 81 meshes with the gear 86 of the traveling gear shaft 84, the forward traveling speed becomes low.
When the back gear 82 and the gear 85 are indirectly engaged with each other via the counter gear 89 of the planted gear shaft 88, the reverse speed is obtained. The rotation of the traveling gear shaft 84 is controlled by the gears 91 and 92.
To the wheel drive shaft 93. From the left and right ends of the wheel drive shaft 93 projecting into the chain case 6,6, the chain 98,99,98,
It is transmitted to the axles 7a, 7a of the running wheels 7, 7 via 99. Side clutches 95, 95 are provided between the wheel drive shaft 93 and the sprockets 98a, 98a of the chains 98, 98, so that the driving of the left and right traveling wheels 7, 7 can be individually turned on / off. . Side clutch 95,
The shifter arms 96, 95 are connected to the side clutch levers 41, 41 by side clutch wires 97, 97.

The main clutch shaft 73 has the gear 8
0, 81, 82, two inter-stock transmission gears 102,
103 is attached. This inter-shift gear 10
By selectively engaging the double gear 104 of the planting gear shaft 88 with the seedlings 2 and 103, the planting planting can be switched between two stages. The planting output taken out by the planting gear shaft 88 is a universal joint 105,
The power is transmitted to the transmission mechanism in the transmission case 12 via the first, second, and third planting transmission shafts 106, 107, and 108 connected by 105.

The planting output input into the transmission case 12 is first transmitted to the planting drive shaft 110. The transmission section is provided with a planting clutch 111. The planting clutch 111 is a fixed-position stop clutch. When the driving is stopped, the planting drive shaft 110 is stopped at a predetermined rotational position. The clutch pin 112 of the planting clutch 111 is connected to the planting / elevating lever 43 via a wire 113. At the left and right ends of the planting drive shaft 110, the cranks 30, 30 of the planting devices 14, 14 are attached.

Power is transmitted from the planting drive shaft 110 via a chain 115 by a lead cam shaft 116. Lead camshaft 1
Reference numeral 16 denotes a shaft having a spiral groove 116a formed on the outer peripheral surface thereof.
Seventeen claws 117a are engaged. Lead metal 117
The laterally moving rod 118 to which is attached is slidably supported in the axial direction, and its left and right ends are connected to the connecting member 11.
It is connected to the lower end side portion of the seedling mounting table 13 via the components 9 and 119. When the lead camshaft 116 rotates, the pawl 117a of the lead metal 117 engages with the groove 116 of the lead camshaft 116.
By moving along the line a, the laterally moving rod 118 reciprocates right and left, and the seedling mounting table 13 also reciprocates right and left integrally with the laterally moving rod 118.

The rice transplanter 1 performs lifting and lowering control and rolling control of the machine body by rotating hydraulically the chain cases 6 and 6 as wheel supports. Next, the mechanism will be described (see FIGS. 6 and 7).

A pitching cylinder 120 for elevating and lowering the body is provided rearward on the back of the hydraulic unit 4. The pitching cylinder 120 is provided with a boost cylinder 133 described later. A link plate 122 urged rearward by a spring 121 is horizontally mounted on the tip of the piston rod of the pitching cylinder 120 in the left and right direction, and the left and right ends of the link plate 122 and the bases 6a and 6a of the chain cases 6 and 6 face upward. The upper ends of the swing arms 124, 124 protruding from the
L, 125R. Left connecting rod 1
The length of 25L can be changed by a rolling cylinder 126.

When the pitching cylinder 120 is extended and retracted, the left and right swing arms 124 and 124 rotate back and forth by the same angle, and the left and right wheels 7 and 7 move up and down by the same amount at the same time. Go up and down. Further, the rolling cylinder 126 is operated to extend and contract to operate the connecting rod 125.
When the length of L is changed, the left swing arm 124 rotates, and only the left wheel 7 moves up and down with respect to the aircraft, thereby adjusting the horizontal inclination of the aircraft.

The hydraulic unit 4 has a control valve 131 of a pitching cylinder 120 to which pressure oil is supplied from the hydraulic pump 5 via a flow dividing valve 130 and a rolling cylinder 126.
Control valve 132 is provided. Further, a boost cylinder 13 is provided in the excess oil return oil passage of the pitching control valve 131.
Three control valves 134 are provided.

The boost cylinder 133 is a cylinder in which a piston is housed in a free state, and one of the cylinder chambers partitioned by the piston has a boost control valve 134.
And the other cylinder chamber is a pitching cylinder 12
0 is in communication with the cylinder chamber on the body ascending side (extending side). Therefore, when the boost control valve 134 is set to the P1 position, the pressure of the surplus oil return oil passage is applied to the boost cylinder 133, and the operating oil corresponding to the cylinder capacity of the boost cylinder 133 is supplied to the body rising cylinder chamber of the pitching cylinder 120, The aircraft rises by a certain height (for example, about 10 cm). Also, the boost control valve 134 is set to P2
When the position is set to the position, the hydraulic oil in the body rising side cylinder chamber of the pitching cylinder 120 returns to the boost cylinder 133, and the body lowers to the original height. The cylinder capacity of the boost cylinder 133 can be adjusted by the capacity switching lever 133a.

When the boost control valve 134 is in the P1 position, the pitching control valve 131 is in the neutral position.
The two control valves are operated in coordination. Therefore, even when the pitching control valve 131 is in any position,
The body lift by the boost cylinder 133 is preferentially performed.

The pitching control valve 131 is connected to the planting / elevating lever 43 via a first hydraulic wire 137, and is switched by the lever. That is, when the planting / elevating lever 43 is operated to “raise”, the body rises to the uppermost position. Planting / elevating lever 43 "fixed"
The aircraft is fixed at the current height. When the planting / elevating lever 43 is operated to “plant”, the machine body descends to the work position, and performs automatic elevation control based on the vertical rotation of the float 60 at the work position. When the planting / elevating lever 43 is operated to “plant”, the planting clutch 11 is moved.
1 becomes "on".

In the automatic lifting control, the height of the topsoil surface is detected by the detection rod 138 attached to the float 60, and based on the detection result, the body is raised where the topsoil surface is high, and the topsoil surface is lowered. Where it is, control is performed to lower the aircraft. Thereby, the planting depth of the seedlings is kept constant.

The boost control valve 134 is connected to an intermediate portion of the side clutch wires 97, 97 via a second hydraulic wire 140, and the side clutch levers 41, 4
1 is linked to the operation. That is, when the left or right side clutch lever 41 is pulled during the turning of the body, the side clutch 95 on that side is turned off, the boost cylinder 133 is driven to the P1 position, and the body rises by a certain height. When the side clutch lever 41 is returned, the side clutch 95 is turned “on”, and the boost cylinder 133 is at the position P2, and descends to its original height. Thus, the turning operation is easy because the on / off of the side clutch and the elevating of the machine can be performed only by operating the side clutch lever 41. Since the aircraft lift at this time is only the minimum required for turning,
The turn can be performed quickly without taking much time to elevate and lower the body, and the steering wheel position can be easily controlled without the handle position becoming too high.

The rolling control valve 132 is switched to a side for correcting the left-right inclination of the body in conjunction with the rotation of the pendulum sensor 141 for detecting the left-right inclination of the body. Thereby, the machine body is always maintained horizontally left and right, and the planting depths of the left and right planting devices 14 and 14 are maintained at the same state.

FIG. 9 shows a different hydraulic configuration. In this hydraulic configuration, since the boost control valve 134 is provided between the flow dividing valve 130 and the pitching control valve 131, even if the boost control valve 134 and the pitching control valve 131 are not linked, When in the position, the boost cylinder 133 can be operated. However, a pilot check valve 142 is provided to prevent the hydraulic oil of the boost cylinder 133 from returning to the tank when the pitching control valve 131 is at the body lowering position.

The rice transplanter 1 is provided with a stand 150 for fixing the body horizontally in the front-rear direction when parking. The stand 150 is rotatably attached to the lower side of the front end of the chain case 6 on the left side, and is stored at a position in contact with the lower surface of the chain case 6 as shown in FIG. 1 during work, and shown in FIG. 2 during parking. As described above, the vehicle body is horizontally supported at three points by the left and right traveling wheels 7, 7 and the stand 150. By providing the stand 150 on the side (left side) that is rotated during the rolling control, the load applied to the rolling cylinder 126 can be reduced.

Furthermore, the rice transplanter 1 is provided with a parking brake device 151 shown in FIG. In the brake device 151, a plate-shaped brake plate 151a is rotatably mounted on the upper front end of the left chain case 6, and the brake plate is rotated between the middle portion of the brake plate and the chain case 6. A spring 151b extending beyond the fulcrum is stretched. During operation, the brake plate 151a is positioned parallel to the chain case 6 as shown by the solid line. When the vehicle is parked, the brake plate 151a is rotated outward as shown by a chain line to abut on the front end of the outer periphery of the wheel 7. When the brake plate 151a is engaged with the lug 7a of the wheel 7, the rotation of the wheel 7 is achieved. Is restrained. Since the brake device 151 is provided on the same side as the stand 150, the operation during parking is easy.

[0031]

As is apparent from the above description, the walking type agricultural working machine according to the present invention has a brake device having a structure in which the plate-like body is engaged with the lug of the traveling wheel to restrain the rotation of the traveling wheel. This makes it possible to provide an inexpensive parking brake device with a simple structure.

[Brief description of the drawings]

FIG. 1 is a side view of a walking rice transplanter in a working state.

FIG. 2 is a side view of the walking rice transplanter in a parking state.

FIG. 3 is a plan view of the walking rice transplanter.

FIG. 4 is a perspective view of a handle.

FIG. 5 is a diagram of a transmission mechanism.

FIG. 6 is a diagram showing a mechanism of pitching control and rolling control.

FIG. 7 is a hydraulic circuit diagram.

FIG. 8 is a perspective view of a brake device.

FIG. 9 is a different hydraulic circuit diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Walking type rice transplanter 2 Transmission case 3 Engine 4 Hydraulic unit 6 Chain case (wheel support) 7 Running wheel 7a Lug 13 Seedling stand 14 Planting device 151 Brake device 151a Brake plate (plate-shaped body)

Claims (1)

[Claims] 1. A walking type agricultural work machine in which left and right running wheels are respectively attached to the tip of a wheel support member rotatably provided on both left and right sides of the body so that the tip moves vertically. A brake device capable of switching between a state in which the rotation of the traveling wheel is restricted by engaging with the lug of the wheel and a state in which the plate-shaped body is not engaged with the lug of the traveling wheel and the rotation of the traveling wheel is not restricted. A walking-type agricultural work machine provided on a support.