JPS6238498Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a suspension system that supports a pair of left and right wheels attached to the body of a rice transplanter so that they operate in opposite directions or move up and down independently. In configuring both the left and right wheels so that when one wheel moves upward or downward using hydraulic pressure, the other wheel moves downward or upward in conjunction with this, so-called reverse operation. In addition to making it extremely easy to adjust the sensitivity and operate the level difference between both wheels, it also makes it possible to freely change the lifting range of both wheels and adjust the restoring force against vertical movement of both wheels. The aim is to downsize the elevating mechanism for elevating and lowering.

Next, an example of the present invention will be explained with reference to the drawings.
In the figure, 1 is a fuselage 6 which has a frame 4 of an engine 3 connected to the front part of a transmission case 2, and a transmission case 5 to the rear thereof, and a float 7 on the lower surface of the fuselage 6.
The rice transplanter shown in FIG. comprising a device 12, a pair of control handles 1;
3, 13', and floats 8, 8' are provided on the outside of the wheels 9, 9', and each of these floats 7,
The rear ends of the floats 8, 8' are height-adjustably attached to the handles 13, 13', etc. using a planting depth adjustment rod 24, and the front end of the center float 7 is attached to the lower surface of the tip of the frame 4. It is configured to be able to move up and down via a link 27, and the tips of both outer floats 8, 8' can also be moved up and down via links 32, 32' to the tips of horizontal bars 31, 31' that protrude laterally from the fuselage 6. It is mounted so that it can move freely.

The two wheels 9, 9' are respectively attached to the tips of swing arms 14, 14' which are rotatably attached to the transmission case 2 by bosses 15, 15' at the base, and are connected to the transmission case 2 from the engine 3.
A portion of the power transmitted to the belt 16 enters the transmission case 5 from the transmission case 2 to drive the seedling planting device 10, while a portion of the power is transmitted to drive shafts 54, 54' protruding from both left and right sides of the transmission case 2. From the traveling transmission mechanism 55 to the side clutch mechanism 56,5
6', and drive both wheels 9, 9' from drive shafts 54, 54' via chains 57 in swing arms 14, 14', and both side clutch mechanisms 56, 56. 'Has spring 5
8 and 58', the clutch lever 59' in the right side clutch mechanism 56' is connected to the right side lever 60' attached to the right steering handle 13', and the clutch lever 59' in the left side clutch mechanism 56 is connected to the right side lever 60' attached to the right steering handle 13'. The lever 59 is connected to a left side lever 60 attached to the left steering handle 13 via wires 61 and 61', respectively, and the right side clutch mechanism 5 is connected by the right side lever 60'.
6', the left side clutch mechanism 56 is turned off by the left side lever 60.

Further, a hydraulic pump 18 is provided on the upper surface of the frame 4 and is transmitted through a belt 17 from the engine 3.
Bell crank type lifting levers 19, 19' are provided on both left and right sides of the mission case 2, rotatably inserted into a shaft 20 which is supported through the mission case 2. A buffer mechanism 26, the tip of which is attached to both swing arms 14, 14'.
The frame 4 of the engine 3 is formed into a rectangular cylindrical shape in cross section, and a single acting hydraulic cylinder 2 is installed inside the frame 4 of the engine 3.
2 is provided so that its piston 23 protrudes forward along the center line of the rice transplanter 1, and the piston 2
3, and both ends of the connecting body 25 are connected to the other ends of the elevating levers 19 and 19' via connecting rods 28 and 28'. The hydraulic pump 18 is provided with a 4-port 3-position switching valve 33, and the hydraulic pump 18 is connected to the pump port P via a circuit 36. The hydraulic pump 18 is connected, the port A is connected to the inlet port 22' of the hydraulic cylinder 22 via the circuit 37, the return ports R ₁ and R ₂ are connected to the oil tank 39, and the spool 41 in the switching valve 33 is connected.
When the is in the neutral position, ports A and R ₁ are closed and ports P and R ₂ are in communication with each other, and when the spool 41 moves to the front of the aircraft, ports R ₁ and R ₂ are closed and ports P and A are in communication with each other. The forward movement of the piston 23 in the hydraulic cylinder 22 lowers both wheels 9, 9' at once to raise the aircraft, and when the spool 41 moves to the rear of the aircraft, ports P, R ₂ and ports A, R ₁ are in communication with each other, so that when the piston 23 in the hydraulic cylinder 22 moves backward, both wheels 9 and 9' are raised simultaneously and the body is lowered.

42 is a sensor having a pin 43 pivoted to the lower part of the frame 4 of the body 6 so that its tip is in contact with the upper surface of the central float 7; 45 is the switching valve 33;
The pin 45 is pivoted upwardly and has an arm 46 that engages the spool 41 of the switching valve 33.
When the bell crank lever 47 is fixed and the sensor 42 rotates downward between one end of the bell crank lever 47 and the base end of the sensor 42, the switching valve 33
The bell crank lever 47 is connected via a link 48 so that when the sensor switches to lower the aircraft and the sensor rotates upward, it switches to raise the aircraft. It is connected via a link mechanism 40 to a manual lever 38 provided in the main body, and is configured so that the body can be raised and lowered by operating the manual lever 38.

Between the connecting body 25 and both connecting rods 28, there are telescopic mechanisms 29, 29' each consisting of a cylinder 30, 30' and a piston 34, 34' slidably fitted inside the cylinder 30, 30'. The cylinder 30,3
Connect the pistons 34, 34' to the connecting body 25.
8 and 28', respectively, and both telescopic mechanisms 2
Front chamber 3 of cylinder 30, 30' at 9, 29'
5 and 35' are respectively provided with springs 50 and 50', while the rear chambers 44 and 44' of the cylinders 30 and 30' are communicated with each other through a pipe 49, and the pipe A valve 51 configured to adjust the passage area of the passageway 49 and close the passageway is provided, and the hydraulic oil from the hydraulic pump 18 is transferred to the communication passageway 49 by operating the switching valve 52. 53 or discharge hydraulic oil from the communication pipe 49 into the oil tank 39.

In this configuration, when the manual lever 38 is rotated rearward, the switching valve 33 is switched to raise the aircraft body, and the forward movement of the connecting body 25 by the piston 23 causes both the bell crank type lifting levers 19, 19' to be interposed. The swing arms 14, 14' rotate downward, the wheels 9, 9' simultaneously move downward relative to the aircraft body, the aircraft body is raised, and the manual lever 38
When the manual lever 38 is rotated in the forward direction, the switching valve 33 is switched to lower the aircraft, and both wheels 9 and 9' move together to approach the aircraft, lowering the aircraft.
When the switch valve 33 is operated to an intermediate neutral position, the switching valve 33 cuts off the flow of oil into and out of the hydraulic cylinder 22, and the lifting and lowering of the aircraft body is stopped at an arbitrary height position.

To carry the rice transplanter into the field and perform rice transplanting work, once the manual lever 38 is moved to the machine-up position and the machine rises significantly, the sensor 42 comes into contact with the top surface of the float 7 by releasing the manual lever. The switching valve 33 switches to lower the aircraft, and the aircraft 6 begins to descend. After the float 7 touches down on the field, the distance between the float and the aircraft gradually approaches, and eventually the float and the aircraft begin to move downward. When the height reaches the predetermined rice-planting work height, the sensor 42 in contact with the top surface of the float 7 rotates upward, and the switching valve 33 is returned to the neutral position, stopping the descent of the machine. , the height of the machine relative to the field can be automatically set to a predetermined rice planting height position.

In this state, while moving forward while performing rice-transplanting work, the height of the aircraft relative to the field changed due to unevenness in the field, where both the wheels 9 and 9' were in contact with the tiller and the float 7 was in contact with the ground. In this case, the downward rotation of the sensor 42 in contact with the float 7 causes the switching valve 33 to switch to lower the machine body, returning the machine body to a predetermined height position, and lowering the height relative to the field. , the upward rotation of the sensor 42 causes the switching valve 3 to
In this way, the height of the machine relative to the field scene can be automatically controlled and adjusted to a predetermined rice-planting height position, such as by switching to raising the machine and returning the machine to a predetermined height position.

During this rice planting work, if one of the wheels, for example the left wheel 9, moves upward due to unevenness of the tiller, etc.
The left telescoping mechanism 2 in the link 28 in the left wheel 9
The piston 34 of No. 9 moves rearward, and the fluid in the cylinder rear chamber 44 enters the cylinder rear chamber 44' in the right telescopic mechanism 29' through the communication pipe 49, and moves the piston 34' forward. Therefore, the right wheel 9' is downwardly opposite to the left wheel 9.
If the right wheel 9' moves upward, this movement will cause the cylinder rear chamber 4 in both telescopic mechanisms 29, 29' to move downward by the same height as the rising height.
4, 44' is transmitted to the left wheel 9, and the left wheel moves downward by the same height. This prevents the aircraft from rolling over uneven surfaces and keeps it level.

In this case, when the valve 51 in the communication pipe 49 is closed to reduce the passage area, the flow of fluid through the communication pipe 49 is regulated, so the sensitivity of the reverse operation of both wheels 9, 9' is reduced. When the valve 51 becomes dull and the valve 51 is opened, the sensitivity of the reverse operation improves, and the sensitivity of the reverse operation can be adjusted freely.Furthermore, when the valve 51 is fully closed, both wheels 9 and 9' This means that it can be locked to prevent reverse operation.

If one of the wheels touches the ridge during rice planting work along the edge of the ridge, the left and right wheels should be leveled up and down so that the machine body is level, and then the valve 51 in the communication pipe 49 should be closed. By closing, the left and right wheels can be locked steplessly at any level difference.

Moreover, if hydraulic oil is supplied from the hydraulic pump to the communication pipe 49 by operating the switching valve 52 of the pipe 53 while the valve 51 in the communication pipe 49 is open, both the telescopic machines 2
The pistons 34, 34' at 9, 29' are connected to the springs 5
Move forward while compressing 0,50', and move both connecting rods 28,2
Since the length of 8' is shortened, the hydraulic cylinder 23
The lifting range of the aircraft can be changed to a higher aircraft height, and the forces of the springs 50, 50' in both the telescoping mechanisms 29, 29' become stronger, creating a restoring force that presses the wheels 9, 9' downward. If the oil in the communication pipe 49 is released into the oil tank 39 by operating the switching valve 52, both telescopic mechanisms 2
As the pistons 34, 34' at the wheels 9, 29' move backward, the connecting rods 28, 28' become longer, so that the lifting range of the aircraft by the hydraulic cylinder can be changed to a direction where the aircraft height is lower, and both wheels 9, 9 The downward restoring force of the two wheels can be adjusted as desired, such as by weakening the downward restoring force of the aircraft.

In another embodiment shown in FIG.
The valve in the communicating pipe 49 allows oil to be supplied simultaneously or separately through pipes 53 and 53' with 2 and 52', and to discharge oil from both telescopic mechanisms 29 and 29' simultaneously or separately. By supplying and discharging hydraulic fluid to both telescopic mechanisms 29 and 29' with the 51 closed, it is possible to arbitrarily adjust the range of elevation of the aircraft using the hydraulic cylinders and the downward restoring force of both wheels. For example, by supplying and discharging hydraulic oil to the left telescoping machine 29, only the left wheel 9 is raised and lowered, and the step between both wheels can be operated by hydraulic pressure, and the step position can be adjusted steplessly as desired. Moreover, when the rice transplanter turns, hydraulic oil can be supplied to the telescopic mechanism 29 on the left side at the same time as the side clutch mechanism 56 on the inside in the turning direction is disengaged, for example, when turning to the left. For example, by disengaging the left side clutch mechanism 56, the rolling reaction force that has been acting on the swing arm 14 in the direction of pushing the aircraft upwards is removed, the left side of the aircraft moves down, and the aircraft tilts to the left. This can be prevented by lowering the left wheel 9 by supplying oil to the left telescoping mechanism 29, and the rice transplanter can be kept horizontal when the rice transplanter turns.

Furthermore, when hydraulic pressure is supplied to or discharged from one or both of the pipes 52 and 52' to the pipe 49 with the valve 51 in the pipe 49 open, both wheels 9 and 9' As in the case where the hydraulic cylinder 22 is activated, both wheels 9 and 9 move up and down simultaneously.
9' can be raised and lowered simultaneously by both the hydraulic cylinder 22 and both telescopic mechanisms 29, 29'. , there is no need to increase the stroke of the hydraulic cylinder 22, and the stroke of the hydraulic cylinder 22 can be adjusted by adjusting the stroke of both telescopic mechanisms 29, 2.
The length can be shortened by the amount of simultaneous lifting and lowering of the wheels by 9'.

As described above, the present invention is a rice transplanter in which a pair of left and right wheels are attached to the body of the rice transplanter via swing arms so as to be able to move vertically, and the rice transplanter is configured to move up and down simultaneously using a lifting mechanism provided on the body. In the machine, between the lifting mechanism and the swing arms of both wheels,
A telescoping mechanism consisting of a cylinder filled with oil and a piston is provided, and the cylinder chambers of both telescoping mechanisms are connected via a conduit, and a conduit for adjusting the passage area of the conduit and a conduit are provided in the conduit. The vehicle is characterized by a valve configured to block the wheels, and a hydraulic pipe connected to the pipe for supplying and discharging oil. The sensitivity of the reverse operation can be freely adjusted using a valve installed in the pipe connecting the cylinder chambers of the telescopic mechanisms of both wheels, so it is possible to adjust the sensitivity of the reverse action to suit the field conditions. In addition to being able to obtain a reverse operating state, both the left and right wheels can be locked in a stepless manner by closing the valve at any level difference, so it is possible to accurately respond to any level difference so that the aircraft can be leveled. be.

Moreover, by supplying and discharging hydraulic pressure from the hydraulic pipe to the valved pipe connecting the cylinder chambers of the telescoping mechanisms of both wheels, the aircraft can be prevented from tilting after the reverse operation of both wheels is locked. Since it can be controlled to hold the rice transplanter horizontally, in conjunction with the stepless locking of the level difference in both wheels, the suspension state of both wheels can be precisely matched to the operating conditions of the rice transplanter, improving its operability. This makes it possible to improve workability.

Furthermore, since both wheels can be raised and lowered at the same time by means of telescopic mechanisms for both wheels, the stroke of the lifting mechanism for raising and lowering both wheels at the same time is
It can be shortened by the simultaneous lifting and lowering of both wheels by both telescopic mechanisms, which also has the effect of making the lifting mechanism smaller and lighter.

[Brief description of the drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the rice transplanter, FIG. 2 is a plan view, FIG. 3 is an enlarged cross-sectional view of FIG. 1, and FIG. 4 is a perspective view of the lifting device. ,
FIG. 5 is a perspective view of a lifting device according to another embodiment. 1... Rice transplanter, 6... Body, 9, 9'... Wheels, 14, 14'... Swing arm, 22...
Hydraulic cylinder, 23... Piston, 25... Connecting body, 19, 19'... Elevating lever, 28, 28'...
...Connection rod, 29,29'...Expansion mechanism, 30,3
0'...Cylinder, 34, 34'...Piston, 5
0,50'... Spring, 49... Communication pipe, 51...
...Valve, 52, 52'...Pipe line.

Claims (1)

[Scope of utility model claims] In a rice transplanter, a pair of left and right wheels are attached to the body of the rice transplanter via swing arms so as to be vertically movable, and the rice transplanter is configured to move up and down simultaneously by a lifting mechanism provided on the body. A telescoping mechanism consisting of a cylinder filled with oil and a piston is provided between the swing arms of both wheels, and the cylinder chambers of both telescoping mechanisms are connected via a conduit. A valve configured to adjust the passage area of the pipe and close the pipe is provided, and a hydraulic pipe for supplying and discharging oil is connected to the pipe. Wheel suspension system for rice transplanters.