JPH07241111A - Transmission apparatus of rice transplanter - Google Patents

Abstract

PURPOSE:To obtain a controlling structure using an HST having excellent operability and various advantages such as smooth transmission behavior and the ability of normal and reverse rotations by contriving a transmission system to inhibit the transmission of an engine power to a running gear and a transplantation apparatus when the speed of the transplanter is slower than a prescribed level to cause floating of seedlings. CONSTITUTION:A rice-transplanter for transmitting an engine power through a main clutch 10 to an HST 12 for transmitting the variable speed output to rear wheels and a transplantation apparatus is provided with a means A for detecting the working state of the transplantation apparatus, a means B for detecting the operation position of the HST 12, a means C for connecting and disconnecting the main clutch 10 and a controlling apparatus D for interlocking the working state detection means A, the position detection means B and the clutch operating means C in such a manner as to inhibit the coupling of the main clutch 10 when the transplantation apparatus is in working state and the HST 12 is in a forwarding range at a speed lower than the lowest speed to enable suitable transplantation work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an HS transmission system for rice transplanters.
The present invention relates to a control structure when a T (hydrostatic type continuously variable transmission) is used.

[0002]

2. Description of the Related Art As a main transmission of a rice transplanter, Japanese Patent Laid-Open No.
It has been common to use a belt continuously variable transmission having an advantage that it can be constructed at a relatively low cost, such as the one disclosed in Japanese Patent Publication No. 260827.

[0003]

However, from the viewpoint of improving operability, it has been considered to mount an HST, which is widely used in tractors, on a rice transplanter. The HST has an advantage that it can perform forward / reverse operation that cannot be realized by a belt continuously variable transmission, and can display a neutral state in which there is no output rotation even if there is input rotation, but there are some problems with this. is there.

That is, the planting device separates the seedlings on the seedling placing table by peeling them off with the planting claws, and until the plunge into the rice field, the seedlings supported by the planting claws are separated by the planting claws. In other words, since the holding state is maintained by the moving inertia, if the driving speed is too slow, the seedlings held by the planting nails will fall spontaneously before they plunge into the rice field, causing so-called floating seedlings. It may end up. For this reason, there is a lower limit to the drive speed of the planting device, but due to the structure of the rice transplanter in which the traveling speed and the planting speed are synchronously driven, the use of HST in the transmission system makes it easy to achieve very low speed travel. However, the above-described floating continuously variable transmission cannot be simply replaced with the HST.

An object of the present invention is to use the HST as a transmission so as to avoid the disadvantage that floating seedlings are generated due to work running at a low speed, and to enjoy the original advantage of excellent operability without hindrance. There is a point to do.

[0006]

In order to achieve the above-mentioned object, the present invention provides the engine output through an HST via a main clutch.
In the transmission device of the rice transplanter, which is configured to transmit the shift output from the HST to the traveling device and the planting device, the work state detecting means for detecting whether or not the planting device is in an operating state. And a position detecting means for detecting the operating position of the HST and a clutch operating means for turning on and off the main clutch, the planting device is in a working state, and the HST
Is equipped with a 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 is at an operating position lower than the predetermined operating position. And

[0007]

In the above characteristic structure, if the HST is at a lower speed side than the predetermined operating position, that is, if the driving speed of the planting device is lower than the predetermined value, the main clutch is restrained from being engaged. The main clutch cannot be operated even if the HST is operated to the low speed traveling position for work traveling, and if the HST is operated at a lower speed than the predetermined value during the planting work at the normal traveling speed, the low speed operation itself is restrained. Or the main clutch is disengaged with a low speed operation. That is, in a low speed state where normal planting operation is not performed, the planting device is linked so as not to operate, and floating seedlings are prevented from occurring.

[0008]

Therefore, by devising the transmission system so that the engine power is not transmitted to the traveling device and the planting device at low speeds below a predetermined level where floating seedlings are produced, smooth gear shifting behavior and forward / reverse rotation can be achieved. H with excellent operability and 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. A riding type rice transplanter is shown in FIG. 1, where 1 is front wheels, 2 is rear wheels, 3 is an engine, 4 is a driving section, 5 is a lifting cylinder,
6 is a lifting link mechanism, and 7 is a planting device. In this rice transplanter, the engine power is transmitted via the HST 12 to the rear wheels 2 which are traveling devices.

FIG. 2 shows the structure of the transmission system. 8 is the engine output shaft, 9 is the first transmission shaft, 10 is the main clutch, and 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 an auxiliary transmission mechanism for changing the planting interval (inter-stock transmission mechanism),
20 is a planted clutch, 21 is a PTO transmission shaft, and 26 is a brake.

Further, in this rice transplanter, an auxiliary PT for driving a working device other than the seedling planting device 7 such as a chemical spraying device.
An O shaft 22 is provided. That is, the power take-out mechanism 23 for branching the 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.
It is a structure for transmitting to the shaft 22. Incidentally, 27 is a hydraulic pump for supplying hydraulic oil to the lifting cylinder 5.

In this rice transplanter, a working state detecting means A for detecting whether or not the planting device is in an operating state, and an HST12.
Position detecting means B for detecting the operating position of the main clutch 1
When the planting device 7 is in a working state and the HST 12 is at an operating position lower than a predetermined operating position, the main clutch 10
A control means D is provided which links the work state detection means A, the position detection means B, and the clutch operating means C so that the gear does not enter the engaged state.

More specifically, FIG. 3 shows a control circuit of the operation system, and 24 is a lifting operation lever of the planting device 7, 2
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 operating part of the HST 12, 34 is the main Drive operation unit of the clutch 10, 44
Is a drive operation unit of the planting clutch 20, 45 is a brake 26
Is a drive operation unit, reference numeral 36 is a sub gear shift lever for traveling, and each switch and devices are control means D which is a control means.
It is connected to the.

Further, as shown in FIG. 4 (a), a first switch 35 for detecting that the raising / lowering operation lever 24 is located at the planting position where the planting clutch 20 is engaged, and FIG. 4 (b) are shown. As described above, the second switch 43 for detecting that the speed change lever 32 is located on the higher speed side than the predetermined operation position Fa in the forward operation range is provided, and the operation of the elevating operation lever 24 from the lowered position to the planting position is restrained. There are provided a solenoid 38 and a solenoid 39 for preventing the shift lever 31 from restraining the movement of the shift lever 31 from a predetermined operation position in the forward movement region to the backward movement region.

To explain the operation of the control device D, in order to carry out the planting work, the subordinate shift lever 36 is operated to the low speed position (planting traveling position) L, and the lifting operation lever 24 is operated to the planting position. And shift the shift lever 32 to the predetermined operation position F.
After being set to a speed higher than a, the depression of the main clutch pedal 30, which is being operated by depressing, is gradually released to engage the clutch, and the planting work at a predetermined traveling speed is started. .

The predetermined operation position Fa is located at a planting claw (not shown).
The seedlings are set to a value in the range where no problem occurs, and the control device D functions so that the planting work is not performed in the forward region at a slower speed. That is, when the up-and-down operation lever 24 is in the planting position and the speed change lever 32 is in the forward range 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. The first switch 35, the second switch 43, and the drive operation unit 34 are controlled so that

Accidentally, the gear shift lever 32 is erroneously operated during the planting traveling.
Is operated to the backward travel side of the predetermined operation position Fa, the main clutch 10 is disengaged and the brake 26 is controlled to operate, so that the machine body is immediately stopped.

When the main clutch 10 is engaged and the vehicle is traveling forward below the predetermined operation position Fa, the lifting operation lever 2
The solenoid 38 is extended so that the telescopic bar 38a extends to the lever operation path so that the planting clutch 20 cannot be operated.

A third switch 40 for detecting that the speed change lever 32 is in the reverse drive range is provided.
Is reversely operated, the planted 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 the work state detecting means A.
In addition, the potentiometer 37 of the speed change lever 32 corresponds to the position detecting means B, and the drive operating portion 34 of the main clutch 10 corresponds to the clutch operating means C, respectively.

[Another embodiment] The vehicle decelerates too much during traveling with planting,
When the shift lever 32 is operated to a position slower than the predetermined operation position Fa, floating seedlings are produced. Therefore, when the raising / lowering operation lever 24 is in the planting position and the main clutch 10 is in the on / off position, the telescopic bar of the solenoid 39 is expanded. 39a may be extended and extended to the operation path of the speed change lever 32, and the check control may be performed so that the speed change lever 32 cannot be operated to the backward travel side from the predetermined operation position a.

Further, as shown in FIG. 5, there is provided a fourth switch 41 which operates when the speed change lever 32 is at or near the neutral position N. When the fourth switch 41 is in operation, a lifting operation is performed. Main clutch 10 independent of lever 24
It is also possible to control so that the cutting operation is performed.

A tilt sensor 42 for detecting the swash plate angle of the hydraulic pump 12P of the HST 12 is provided, and the tilt sensor 4 is provided.
If the output information of 2 exceeds the specified value, or the tilt sensor 42 does not change even if the shift lever 32 is operated, or conversely changes too much, the main clutch 10 is disengaged and the brake is applied until the aircraft stops. It is also possible to control 26 to operate continuously.

The working state detecting means A may be constituted by detecting whether the planting clutch 20 is engaged or disengaged, or by detecting whether or not the PTO shaft 18 is rotating, and detects the traveling speed of a speedometer or the like. By doing so, the position detection stage B may be configured. Further, in the one in which the main clutch pedal 30 and the main clutch 10 are mechanically interlocked and connected, a clutch operating means capable of operating a drive operation unit capable of freely opening and closing the main clutch 10 independently of the main clutch pedal 30. But good.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Side view of a riding rice transplanter

[Fig. 2] Diagram showing the 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 for checking and restraining the main clutch.

[Explanation of symbols]

 2 traveling device 3 engine 7 planting device 10 main clutch 12 HSTA A work state detecting means B position detecting means C clutch operating means D control means

Claims (1)

[Claims] 1. The output of the engine (3) is supplied to the main clutch (1).
0) to the HST (12) and the HST (1
A transmission device of a rice transplanter configured to transmit the variable speed output from 2) to the traveling device (2) and the planting device (7), wherein the planting device (7) is in an operating state. A work state detecting means (A) for detecting whether or not, a position detecting means (B) for detecting an operating position of the HST (12), and a clutch operating means (C) for performing on / off operation of 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 prevented from being engaged. A transmission device for a rice transplanter, further comprising a control means (D) that links the work state detection means (A), the position detection means (B), and the clutch operation means (C).