JPH022174Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an automatic working part lifting device for a paddy field working machine that supports a rice transplanting working machine, a sowing working machine, etc. on a traveling machine body so as to be able to rise and fall freely. For example, when changing direction during rice planting work using a riding rice transplanter shown as an example of a rice paddy work machine, release the clutch of the planting section to raise it, and then depress the steering pedal such as the left and right brake pedals or side clutch pedals. The operation is complicated and requires a high level of skill because the handle must be operated while the vehicle is in use.

Therefore, it may be possible to disengage the clutch of the planting section and raise the planting section in conjunction with the depression of the steering pedal, and to raise the hydraulic lever when the planting section reaches the raised position. It would be very convenient to have a system that automatically returns the hydraulic lever from the neutral position to the neutral position, but there are various constraints such as lever timing problems and space problems in incorporating this automatic neutral return mechanism for the hydraulic lever. The reality is that this type of planting part is linked so that it automatically rises, and an automatic neutral return mechanism for the lever is installed in it. I wasn't there.

The present invention was devised to solve the above-mentioned problem, and as the steering pedal is depressed, the hydraulic lever is moved to the raised position and the work clutch operating mechanism is moved to the disengaged position by an interlocking device that operates in conjunction with the depression of the steering pedal. The hydraulic lever is divided into two parts, and the member that engages with the hydraulic lever is freely movable.The hydraulic lever has an automatic neutral function that automatically returns the hydraulic lever from the raised position to the neutral position when the working part reaches its lifting limit. The return mechanism can be installed extremely easily, and a series of operations are automatically performed until the working part is stably maintained at the neutral position at the limit of ascent by simply pressing the steering pedal. .

An embodiment of the present invention will be described based on the drawings. 1 is a running body of a riding rice transplanter shown as an example of a paddy field working machine, which is supported by wheels that run on a tiller, and has an engine mounted on the front. A control handle is provided in the middle part, and a rear frame 2 extends below a driver's seat that stands upright at the rear. 3 is a cover that covers the rear frame 2. A planting section 6 is attached to the rear of the traveling body 1 as a working section so that it can be raised and lowered by means of a lower link 4 and an upper link 5. Below, a float 8 that slides on the rice field is pivoted so that its front part can move up and down with its rear part as a fulcrum. Reference numeral 9 denotes a link holder that stands integrally with the planting frame 7 at the front of the planting section 6, and a bell crank 10 is pivotally supported in the middle of the vertical direction of the link holder. is supported, and the connection is 11
The other end is connected to the tip of a swinging link 12 pivotally supported on the planting frame 7, and the middle part of the swinging link 12 and the float 8 are connected by a connecting rod 13, and the tip of the float 8 The bell crank 10 is designed to rotate due to the vertical movement of the bell crank 10. Reference numeral 14 denotes a seedling stand, which is supported by the planting frame 7 so as to be able to reciprocate from side to side, and a planting rod is provided below it.

15 is a hydraulic cylinder, the end of which is supported by the transmission case 16 of the traveling body 1, and the ram 15
The tip of a is pivoted to an upper link 5.
A slide bar 17 is supported by a bracket 15b provided on the ram 15a and is slidable in parallel to the operating direction of the ram 15a.A tension spring 18 is fitted onto the slide bar 17, and the tension spring 18 is fitted when the ram 15a protrudes beyond a certain level. A spring 18 is compressed between the collar at the tip of the slide bar 17 and the bracket 15b, and pulls the wire 19 connected to the other end of the slide bar 17. Reference numeral 20 denotes a hydraulic valve connected to the hydraulic cylinder 15, which controls the raising, neutralizing, and lowering of the planting section 6. The forward position U of the valve arm 21 indicates rising, the central position N is neutral, and the rear position D is Each indicates a decline. The valve arm 21 is connected to a rod 22 projecting forward from the slide plate 23, one end of a bell crank 24 pivoted 25 to the rear frame 2 is connected to the slide plate 23, and the other end is connected to a rod 22 projecting forward from the slide plate 23. A spring 26 is locked to the rear frame 2, and the tension of the spring 26 biases the valve arm 21 in the downward direction D. The spring 26 supporting side of the bell crank 24 and the other end of the bell crank provided on the link holder 9 are connected by a connecting rod 27.

Reference numeral 28 denotes a side clutch petal that controls the direction change of the aircraft, and there are a pair of left and right side clutch petals, which are pivotally supported 29 on the rear frame 2. The right side clutch petal 28 is attached to a clutch arm 31 that protrudes from the transmission case 16 via a rod 30. connected to the left pedal 2
8 is connected to a clutch arm 33 via a rod 32, and the direction can be changed by depressing either one of the left and right pedals 28, 28. The side clutch petal 28 is an operating rod 3 whose one end is pivoted 35 to the cover 3.
4 by a wire 34a, and a spring 34 stretched between the operating rod 34 and the cover 3.
Due to the tension b, the operating rod 34 itself is urged rearward about the fulcrum 35, and the side clutch petal 28 is also urged upward, that is, in the direction in which the side clutch is engaged. A coil spring for returning the pedal is provided at the base of the side clutch pedal 28.

Reference numeral 36 denotes a planter clutch arm for operating a work clutch, which can be rotated about a support shaft 37 to intermittent power to the planting section 6, and is stretched between the arm 36 and the transmission case 16. The spring 38 is biased downward, that is, in the input direction of the clutch. 39 is a planter lever as a work clutch operating mechanism, and a support shaft 40 provided at its base is connected to the operating rod 3 of the cover 3.
It is pivotally supported near the planter lever 3.
9 and the planter clutch arm 36
The planter lever 39 is connected by a wire 39a, and the planter lever 39 is biased by the tension of the spring 38 in the forward direction, that is, in the direction in which the clutch is engaged. Reference numeral 41 denotes a hydraulic lever, which projects upward through a joint 43 from one end of a substantially triangular lever plate 42 that is rotatably fitted around the support shaft 40, and is provided at the joint 43. The upper end is biased by a spring 43a so as to be oriented laterally. The other end of the wire 19 attached to the end of the slide bar 17 provided on the side of the hydraulic cylinder 15 is connected to the other end of the lever plate 42 . 4
Reference numeral 5 denotes a rod whose upper end is supported near the joint 43 of the lever plate 42, and whose lower end is connected to one end of a pinned plate 46 which is pivoted 47 to the rear frame 2. The pin 48 provided in the pin-equipped plate 46 is fitted into the long hole 23a provided in the slide plate 23, and when the hydraulic lever 41 is tilted forward and the valve arm 21 is in the D position, the pin 48 is inserted into the long hole 23a provided in the slide plate 23. 48 is located at the front end of the elongated hole 23a. Further, a horizontal rod 44 is provided in the middle of the planter lever 39 to protrude laterally, and when the hydraulic lever 41 is tilted from the lowered position to the rear raised position, the horizontal rod 44 is hooked and the planter lever 3
9 is also driven by the hydraulic lever 41 to fall from the clutch engaged position to the rearward clutch disengaged position.

The wire 39a is connected to the hydraulic lever 41, so that the planting part 6 can be moved only by the hydraulic lever 41.
It may also be possible to perform lifting and lowering operations as well as power intermittent operations.

FIG. 4 shows the lever guide provided on the cover 3, where 49 is the planter lever 3.
In the guide groove 9, the front sign ``ON'' indicates the clutch engagement position, and the rear sign ``OFF'' indicates the clutch disengagement position. 50 is a guide groove of the hydraulic lever 41, the front mark "D" indicates the position where the planting part 6 is lowered, the rear "U" indicates the position where it is raised, and the "N" on the branch groove in the center indicates the neutral position. It's showing. This branch groove is provided on the biasing side of the spring 43a. When the hydraulic lever 41 moves forward from the "U" position, it automatically enters the branch groove, ie, the "N" position, by the lateral bias of a spring 43a provided at the joint 43 of the lever. 51 is a floating rod rotatably fitted onto the support shaft 40;
It is pulled from the upper and lower sides by springs 52 and 53 provided on the cover 3 side, and is always urged to return to a constant posture. The floating rod 51 is
The end closer to the operating rod 34 is curved and protrudes like a mountain, and when the operating rod 34 swings, when the protruding portion comes into contact with this, it rotates around the support shaft 40, and when it separates, it springs up. The balance action of 52 and 53 restores the original constant posture.
The other end of the floating rod 51 is bent.
When the bent portion 51a contacts the hydraulic lever 41 when the floating rod 51 rotates clockwise, the hydraulic lever 41 is pushed backward, that is, in the "U" direction.

Next, the functions and effects of the present invention will be explained.

When carrying out planting work by lowering the planting unit 6, which is in the raised position relative to the traveling machine 1 that travels based on the tiller, onto the rice field, move the hydraulic lever 41 forward to the lowered position. When the rod 45 is pressed down, the pin plate 46 rotates clockwise about the fulcrum 47, and the pin 48 moves rearward to be located approximately at the center of the elongated hole 23a. Then, the slide plate 23 moves rearward due to the urging of the spring 26 via the bell crank 24 and the hanging of the float 8 until the front end of the elongated hole 23a comes into contact with the pin 48, as shown in FIG.
The valve arm 21 of the hydraulic valve 20 moves to the lowered position "D", and the planting part 6 is moved to the hydraulic cylinder 15.
It descends due to the action of As the planting part 6 descends, the float 8 descends and lands on the rice field, and as the ground pressure increases, the swing link 12 rotates upward.
As a result, the bell crank 10 rotates counterclockwise, pushing the slide plate 23 and the rod 22 forward against the elasticity of the spring 26, and when the valve arm 21 rotates to the neutral position N, the hydraulic cylinder The lowering operation of 15 is stopped, and the planting part 6 maintains its position by maintaining the ground pressure of the float 8 at an appropriate level.
Then, when the planter lever 39 is moved forward to the clutch engaged position, planting is started.

During planting work, when the plowing platform is deep and the traveling machine body 1 side sinks, the planting part 6 side also tends to sink, and the ground pressure of the float 8 increases, the swinging link 12 is pushed up to the horizontal rod 13 and the horizontal rod 11 is pushed up. via bell crank 10
rotates counterclockwise, the bell crank 24 is pulled by the horizontal rod 27, rotates counterclockwise against the bias of the spring 26, and as the slide plate 23 moves forward, the valve arm 21 The planting portion 6 is moved in the upward “U” direction, and in conjunction with this switching operation of the valve arm 21, the planting portion 6 is raised by the action of the hydraulic cylinder 15. When the ground pressure of the float 8 becomes appropriate as the planting section 6 rises, the valve arm 21 becomes the neutral "N" position as described above, and the planting section 6 is maintained at that position. On the other hand, when the plowing platform becomes shallower and the ground pressure of the float 8 decreases, the valve arm 21 moves downward in the "D" direction due to the rearward movement of the slide plate 23 due to the opposite effect to that described above, and the planting part 6 is lowered to the proper position and the ground pressure of the float 8 is made proper. As described above, as long as the hydraulic lever 41 is set to the lowered position, the planting part 6 will automatically move up and down in response to the ground pressure of the float 8 to maintain the appropriate position, regardless of the depth of the tiller. The planting depth is maintained to be approximately constant.

When changing direction on a headland, this is done by pressing the left and right side clutch pedals 28 and operating the steering handle.
If you step on either 8 or 28, you will get Lotto 30.
Or, the clutch arm 31 or 33 connected by the wire 32 is operated and the power transmission path to either the left or right wheel provided in the fuselage 1 is cut off, while the clutch arm 31 or 33 connected by the wire 34a is operated as shown in FIG. Rod 3
4 rotates forward about the fulcrum 35 against the bias of the spring 34b, until the spring 5
The hydraulic lever 41 is brought into contact with the floating rod 51, which is in a stable position due to the biasing balance of 2 and 53, and is rotated clockwise about the support shaft 40.
is pushed by the bent portion 51a of the floating rod 51 and the support shaft 40
Rotate backwards around the planter lever 3.
9 also rotates rearward when its horizontal rod 44 is pushed by the hydraulic lever 41. Then, as the lever plate 42 supporting the hydraulic lever 41 rotates clockwise, the pin plate 46 connected by the rod 45 rotates counterclockwise about the fulcrum 47, and the pin 48 moves forward through the elongated hole 23a. By pushing the valve arm 21 to the raised position "U", the planter clutch arm 36 connected to the planter lever 39 by a wire 39a also rotates in the cutting direction against the bias of the spring 38. By depressing the side clutch petal 28, the three actions of disengaging the side clutch, raising the planting portion 6, and disengaging the planter clutch are performed all at once. In the above operation, when the side clutch pedal 28 is depressed to the lowest position and the actuating rod 34 exceeds the contact with the floating rod 51, the floating rod 51 disconnects from the hydraulic lever 41 and the spring 52, as shown in FIG. , 53 returns to the original stable posture of balance. At this time, since the line of action of the rod 45 extends beyond the support shaft 40, the lever plate 42 does not return to its original position, and the hydraulic lever 41 and the planter lever 39 are held in the backward position.
As shown in FIG. 7, when the ram 15a of the hydraulic cylinder 15 is fully extended and the planting part 6 rises to the top, the spring 18 is compressed by the movement of the bracket 15b provided on the ram 15a, and the spring 18 is The lever plate 42 connected thereto rotates counterclockwise about the support shaft 40. At this time, the hydraulic lever 41 moves to the branch groove "N" provided in the lever guide 50 because it is urged laterally by the spring 43a provided in the joint part. The pin plate 46 also rotates clockwise in conjunction with the rotation of the lever plate 42, and the pin 48 moves rearward as shown in FIG. 8, and the slide plate 23 also moves rearward due to the bias of the spring 26. The balance arm 21 then moves from the raised position "U" to the neutral position "N", and the planting section 6 is fixed at the raised position. At that time, the line of action of the wire 39a of the planter lever 39 is
Since it exceeds 0, the current posture is maintained without moving forward. In this way, simply by depressing the side clutch petal 28, the clutch of the planting section 6 is released, and at the same time, the planting section 6 is raised, and at the rising limit, the hydraulic lever 41 quickly and automatically returns to the neutral position "N". Moreover, since the hydraulic valve 20 is designed to automatically return to the neutral position "N",
There is no need to return the hydraulic lever 41 to the neutral state, and the breather action of the valve 20 at the raised position "U" can be suppressed in an extremely short period of time, improving the durability of the entire hydraulic mechanism and ensuring long service life. It stands the test of time.

While the above-mentioned side clutch pedal 28 is being depressed, the direction of the aircraft is changed, and the pedal 28
When the foot is released, the operating rod 34 is pulled back by the spring 34b, and at this time, the floating rod 51 is rotated once counterclockwise as shown in FIG. 9, regardless of the hydraulic lever 41 due to contact with the operating rod 34. However, the operating rod 34
When it passes, the balance action of the springs 51 and 53 quickly returns it to its original stable position. When planting the next row after changing direction, press hydraulic lever 4.
1 is tilted forward, the planting part 6 is lowered to the ground, and then the planter lever 39 is also tilted forward to engage the clutch, and the planting work is resumed.

In addition, when explaining the present invention, the interlocking lifting operation of the planting section 6, which is a working section, will be performed using the side clutch petal 2.
Although it has been explained that it is linked to the depression of Step 8, in the case of a device that does not have a side clutch pedal and is turned by left and right brake pedals, etc., it shall be configured to be linked to a steering pedal such as a brake pedal. .

Furthermore, although this embodiment has been described based on the operation of a hydraulic piston as the operation source for the automatic neutral return mechanism of the hydraulic lever, it may be returned to neutral based on the operation of a lower link, an upper link, or the like. In short, it is only necessary to detect the lifting limit of the working part and operate it.

In this way, the present invention supports a working part that can be raised and lowered by hydraulic operation at the rear of a traveling aircraft that changes direction by pressing the left and right steering pedals, and also connects and disconnects power transmission to the working part. In a paddy field work machine in which a work clutch operating mechanism is connected to a hydraulic lever that controls hydraulic operation so that power transmission to the working part is cut off when the working part is raised, there is provided a hydraulic lever near the base of the hydraulic lever. A movable rod that can be engaged and disengaged is rotatably provided, and the movable rod is biased so as to always return to a constant posture corresponding to the lowering set position of the hydraulic lever, and a An operating rod that can be engaged with and disengaged from the floating rod and swingable in one direction is provided, the operating rod is interlocked and connected to a steering pedal, and the operating rod presses the floating rod as the steering pedal is depressed. When the hydraulic lever is moved to the raised position of the working part, the floating rod is disengaged from the operating rod and the hydraulic lever and returns to the original position corresponding to the lowered setting position of the hydraulic lever, and the above-mentioned An automatic working part lifting device for a paddy field working machine, characterized in that the hydraulic lever is provided with an automatic neutral return mechanism that automatically returns the hydraulic lever from a raised position to a neutral position when the working part reaches its lifting limit. When changing direction, when the steering pedal is depressed, the clutch of the working part is automatically disengaged in conjunction with the pedal depression operation, and the working part is automatically raised. Although it is extremely easy to operate and does not require skill, the hydraulic lever automatically returns to the neutral position when the working part reaches its lifting limit, increasing the durability of the hydraulic system. There is no longer a need to return the hydraulic lever to the neutral position, and the operation to raise the working part when changing direction is automatically performed by simply pressing the steering pedal, so the driver can control the steering. This allows you to concentrate on driving and perform accurate and smooth turning operations.
Furthermore, when incorporating the mechanism for automatically returning the hydraulic lever to the neutral position, the operating member in the interlocking mechanism from the steering pedal to the hydraulic lever is divided into two members, an operating rod and a floating rod, In addition, since the floating rod is biased to return to a constant posture corresponding to the lower setting position of the hydraulic lever, the above-mentioned hydraulic lever automatic neutral return mechanism can be incorporated with an extremely simple structure. It has been reached.

[Brief explanation of the drawing]

The drawings show one embodiment of the device of the present invention, in which Fig. 1 is an overall side view of the riding rice transplanter, Fig. 2 is a side view of the main parts with some parts omitted, and Fig. 3 is a hydraulic A front cross-sectional view showing the support part of the lever and the planter lever, Fig. 4 is a plan view showing the lever guide part, Fig. 5 is an explanatory diagram of the action when the side clutch pedal is slightly depressed, and Fig. 6 is a diagram showing the side clutch. Figure 7 is an explanatory diagram of the effect when the pedal is further depressed. Figure 7 is an explanatory diagram of the effect when the side clutch pedal is fully depressed. Figure 8 is an explanatory diagram when the hydraulic lever returns to the neutral position. FIG. 9 is an explanatory view of the operation during the return of the side clutch pedal from the state shown in FIG. 7. DESCRIPTION OF SYMBOLS 1... Traveling machine body, 6... Planting part, 20... Hydraulic valve, 21... Valve arm, 28... Side clutch petal, 34... Operating rod, 39... Planter lever, 41... Hydraulic lever, 49... Guide groove, 50...
Guide groove, 51... floating rod.

Claims (1)

[Scope of utility model registration request] At the rear of the traveling aircraft, which changes direction by pressing the left and right steering pedals, a working part that can be raised and lowered by hydraulic operation is supported, and a working clutch operating mechanism that cuts off and cuts power to the working part is hydraulically operated. In a paddy field working machine connected to a hydraulic lever controlling the hydraulic pressure so that power transmission to the working part is cut off when the working part is raised, a floating rod that can be engaged with and disengaged from the hydraulic lever is provided near the base of the hydraulic lever. is rotatably provided, the floating rod is biased so as to always return to a fixed posture corresponding to the lowering setting position of the hydraulic lever, and is located near the floating rod and can be engaged with and disengaged from the floating rod. An operating rod is provided that can swing in one direction, and the operating rod is interlocked and connected to a steering pedal, and as the steering pedal is depressed, the operating rod presses the floating rod, causing the hydraulic lever to raise the working part. When the floating rod is moved to the position, the floating rod is disengaged from the operating rod and the hydraulic lever and returns to the original position corresponding to the lowering setting position of the hydraulic lever, and the hydraulic lever has a working part. An automatic working part lifting device for a paddy field working machine, characterized by being provided with an automatic neutral return mechanism that automatically returns a hydraulic lever from a lifting position to a neutral position when the lifting limit is reached.