JP2869327B2 - Rice transplanter transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a transmission system for a rice transplanter.
The present invention relates to a control structure using T (hydrostatic continuously variable transmission).

[0002]

2. Description of the Related Art As a main transmission of a rice transplanter, Japanese Patent Laid-Open Publication No.
No. 2,608,827, it is common to use a belt continuously variable transmission which has an advantage that it can be constructed at a relatively low cost.

[0003]

However, from the viewpoint of improving operability, it has been studied to mount an HST, which is frequently used in a tractor, on a rice transplanter. The HST has the advantage of being able to perform forward and reverse rotation operations that cannot be realized with a belt continuously variable transmission, and can also exhibit a neutral state where there is no input rotation even if there is an input rotation. is there.

[0004] That is, the planting device separates the seedlings on the seedling mounting table by peeling them off with the planting claws, and until the plant enters the rice field, the seedlings supported by the planting claws are the planting claws. Because the holding state is maintained by the moving inertia, if the driving speed is too slow, the seedlings held by the planting claws will fall naturally before rushing into the rice field, resulting in so-called floating seedlings. Sometimes. For this reason, there is a lower limit to the driving speed of the planting device. However, due to the structure of the rice transplanter in which the traveling speed and the planting speed are driven in synchronism, the use of the HST as the transmission system makes it easy to perform low-speed traveling. There is a high possibility that the above-mentioned floating seedlings will be generated, and it is not possible to simply replace the conventional belt continuously variable transmission with the HST.

[0005] An object of the present invention is to prevent the disadvantage that floating seedlings are produced by work traveling at a low speed while using the HST as a transmission, and to enjoy the original advantage of excellent operability without hindrance. Is to do.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for controlling the output of an engine via an HST through a main clutch.
In the transmission of a rice transplanter configured to transmit the speed change output from the HST to the traveling device and the planting device, a work state detecting means for detecting whether or not the planting device is operating. And a position detecting means for detecting an operating position of the HST, and a clutch operating means for engaging and disengaging the main clutch, wherein the planting device is in a working state and the HST
Is provided with control means for linking the work state detecting means, the position detecting means, and the clutch operating means so that the main clutch does not enter the engaged state when the operating position is lower than the predetermined operating position. And

[0007]

In the above-mentioned characteristic configuration, when the HST is at a lower speed side than the predetermined operation position, that is, when the driving speed of the planting device is lower than the predetermined speed, the main clutch is prevented from being engaged, so that the HST is erroneously performed. The main clutch cannot be operated even if the HST is moved to the low-speed traveling position to perform work traveling, and if the HST is operated at a lower speed than a predetermined value during the planting operation at the normal traveling speed, the low-speed operation itself is restrained. Or the main clutch is disengaged with the low-speed operation. That is, in a low-speed state where the normal planting operation is not performed, the planting device is linked so as not to be operated, and the occurrence of floating seedlings is prevented beforehand.

[0008]

Therefore, the transmission system is devised so that the engine power is not transmitted to the traveling device and the planting device at a low speed lower than a predetermined value at which floating seedlings are generated, so that smooth shifting behavior and forward / reverse rotation can be achieved. H with excellent operability with advantages
ST could be used in rice transplanters without inconvenience.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a riding type rice transplanter, wherein 1 is a front wheel, 2 is a rear wheel, 3 is an engine, 4 is an operating unit, 5 is a lifting cylinder,
Reference numeral 6 denotes a lifting link mechanism, and reference numeral 7 denotes a planting device. This rice transplanter is configured to transmit engine power to a rear wheel 2 as a traveling device via an HST 12.

FIG. 2 shows the structure of a transmission system, wherein 8 is an engine output shaft, 9 is a first transmission shaft, 10 is a main clutch, 12
Is an HST including a hydraulic pump 12P and a hydraulic motor 12M, 13 is a transmission case, 14 is a sub transmission mechanism for traveling, 15 is a rear wheel differential mechanism, 16 is a front wheel drive shaft,
17 is a front wheel differential mechanism, 18 is a PTO shaft for a planting device,
19 is a subtransmission mechanism for changing the planting interval (inter-stock transmission mechanism),
20 is a planting clutch, 21 is a PTO transmission shaft, and 26 is a brake.

In this rice transplanter, an auxiliary PT for driving a working device different from the seedling planting device 7 such as a chemical spraying device is provided.
An O-axis 22 is provided. That is, a power take-out mechanism 23 for branching power from the input shaft 11 of the main clutch 10 is provided, and its output rotation is transmitted through the transmission shaft 28 to the auxiliary PTO.
This is a structure for transmitting to the shaft 22. Reference numeral 27 denotes a hydraulic pump that supplies hydraulic oil to the lifting cylinder 5.

In this rice transplanter, a work state detecting means A for detecting whether or not the planting apparatus is in an operating state;
Position detecting means B for detecting the operation position of the main clutch 1
And a clutch operating means C for performing on / off operation of the main clutch 10 when the planting device 7 is in the working state and the HST 12 is in the operation position on the lower side than the predetermined operation position.
Is provided with a control means D for linking the work state detecting means A, the position detecting means B and the clutch operating means C so as to prevent the vehicle from entering the engaged state.

More specifically, FIG. 3 shows a control circuit of an operation system.
5 is the potentiometer, 26 is the brake, 29 is the brake pedal, 30 is the main clutch pedal, 31 is the potentiometer, 32 is the speed change lever for operating the HST 12, 37 is the potentiometer, 33 is the drive operation unit of the HST 12, and 34 is the main operating unit. Drive operating section of clutch 10, 44
Is a drive operation unit of the planting clutch 20, and 45 is a brake 26
, A reference numeral 36 denotes a traveling auxiliary speed change lever, and each switch and devices are control devices D as control means.
It is connected to the.

Further, as shown in FIG. 4A, a first switch 35 for detecting that the elevating operation lever 24 is located at the planting position where the planting clutch 20 is engaged, and FIG. As described above, the second switch 43 for detecting that the speed change lever 32 is on the higher speed side than the predetermined operation position Fa in the forward operation area is provided, and the operation of the elevating operation lever 24 from the lowered position to the planting position is prevented. And a solenoid 39 for preventing the transmission lever 31 from moving from a predetermined operation position in the forward movement region toward the reverse operation region.

The operation of the control device D will be described. In order to perform the planting operation, the vertical operation lever 24 is operated to the planting position while the auxiliary transmission lever 36 is operated to the low speed position (planting traveling position) L. And the shift lever 32 is moved to the predetermined operation position F.
A is set to a higher speed side than a, and then the depression of the main clutch pedal 30, which is being disengaged by depressing, is gradually released, the clutch is engaged, and the planting operation at a predetermined traveling speed is started. .

The predetermined operation position Fa is set by a planting claw (not shown).
The control device D functions so that planting work is not performed in the forward area at a slower speed than the above range. That is, when the lifting operation lever 24 is in the planting position and the speed change lever 32 is in the forward movement region that is slower than the predetermined operation position Fa, the main clutch 10 is disengaged regardless of the depression operation of the main clutch pedal 30. Thus, the first switch 35, the second switch 43, and the drive operation unit 34 are controlled.

By mistake, during the planting run, the shift lever 32
Is operated in the reverse range from the predetermined operation position Fa, the main clutch 10 is disengaged and the brake 26 is controlled to operate, so that the aircraft immediately stops.

When the main clutch 10 is engaged and the vehicle is in the forward running state below the predetermined operation position Fa, the lifting operation lever 2
The solenoid 38 is extended to operate so that the planting position 4 cannot be operated to the planting position, and the telescopic bar 38a is extended to the lever operation path, and the planting clutch 20 is controlled so as not to be operated.

A third switch 40 for detecting that the shift lever 32 is in the reverse range is provided.
Is operated, the planting clutch 20 is also controlled to be disengaged regardless of the position of the lifting operation lever 24. That is, the first switch 35 is connected to the work state detecting means A
The potentiometer 37 of the shift lever 32 corresponds to the position detecting means B, and the drive operating section 34 of the main clutch 10 corresponds to the clutch operating means C.

[Another embodiment] During planting, the vehicle slows down too much.
When the speed change lever 32 is operated to a position later than the predetermined operation position Fa, floating seedlings are generated. Therefore, when the elevating operation lever 24 is at the planting position and the main clutch 10 is engaged, the extension bar of the solenoid 39 is moved. The retracting control may be performed so that the transmission lever 39a extends to protrude into the operation path of the transmission lever 32, and the transmission lever 32 cannot be operated beyond the predetermined operation position a to the reverse region.

As shown in FIG. 5, there is provided a fourth switch 41 which operates when the shift lever 32 is at or near the neutral position N. When the fourth switch 41 is operating, the up / down operation is performed. Irrespective of the lever 24, the main clutch 10
May be controlled so as to be turned off.

An inclination sensor 42 for detecting a swash plate angle of the hydraulic pump 12P of the HST 12 is provided.
If the output information of step 2 exceeds the specified value, or if the inclination sensor 42 does not change even if the shift lever 32 is operated, or if it changes too much, the main clutch 10 is disengaged and the brake is applied until the machine stops. 26 may be controlled to operate continuously.

The work state detecting means A may be constituted by detecting whether the planting clutch 20 is engaged or disengaged, or by detecting whether the PTO shaft 18 is rotating. Thus, the position detection stage B may be configured. A clutch operating means in which the main clutch pedal 30 and the main clutch 10 are mechanically interlocked and connected, and a drive operating portion capable of turning on and off the main clutch 10 can be operated independently of the main clutch pedal 30. But it is good.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a diagram showing a transmission system;

FIG. 3 is a system diagram showing a transmission control structure.

FIG. 4 is an operation path diagram of a lifting operation lever and a shift lever.

FIG. 5 is a perspective view showing a main part of another means of checking with the main clutch.

[Explanation of symbols]

 2 Traveling device 3 Engine 7 Planting device 10 Main clutch 12 HST A Work state detecting means B Position detecting means C Clutch operating means D Control means

Claims (1)

(57) [Claims] An output of an engine (3) is supplied to a main clutch (1).
0) to the HST (12), and this HST (1)
A transmission for a rice transplanter configured to transmit the shift output from 2) to a traveling device (2) and a planting device (7), wherein the planting device (7) is in an operating state. A working state detecting means (A) for detecting the operation state, a position detecting means (B) for detecting the operating position of the HST (12), and a clutch operating means (C) for engaging and disengaging the main clutch (10). When the planting device (7) is in a working state and the HST (12) is in an operation position on a lower speed side than a predetermined operation position, the main clutch (10) is not brought into an engaged state. And a control device (D) for linking the work state detecting means (A), the position detecting means (B), and the clutch operating means (C).