JPH0989101A - Speed change controller for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the satisfactory start even if low speed operation is forgotten by interlocking a clutch detecting means with an operating mechanism so that a traveling clutch operated to the transmission side holds a speed change gear in a predetermined low speed position for a set time and then is subjected automatically to the over-drive operation in the speed change position corresponding to the operating position. SOLUTION: An electric control means is used for the operation of trunion shafts 10a in a rice transplanter. A reduction gear A to interlock a clutch switch 17 with a speed change mechanism 11 is provided to operatively decelerate an HST(hydrostatic stepless transmission) 10 automatically in a predetermined low speed position (a) when a main clutch 9 is operated from the transmission side to the transmission intercepting position. An overdriving means B to interlock the clutch switch 17 with the speed change mechanism 11 and a timer 18 is provided to automatically operatively overdrive the HST 10 in the speed change position corresponding to the operating position of a speed change lever 13 when the main clutch 9 is operated from the transmission intercepting side to the transmission side and after the HST 10 is held in a predetermined low speed position (a) for a set time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed change control device for working machines such as rice transplanters and tractors, and more particularly to a speed change control device that does not suddenly start even if a start operation is performed while the speed change device is in a high speed state. , A technology that allows a gentle start-up behavior from a low speed to appear automatically.

[0002]

2. Description of the Related Art For example, Japanese Patent Application No. 7-129 filed earlier
In No. 979, a switch that is operated by depressing the clutch pedal is provided, and the continuously variable transmission for traveling is automatically decelerated to a low speed position for starting in conjunction with disengagement of the main clutch, and when the main clutch is engaged. A technique has been proposed in which, in conjunction with this, the continuously variable transmission is speeded up so as to automatically return to the original shift position.

For example, when the vehicle is running at a high speed, the clutch pedal is depressed and the main clutch is disengaged, and then the vehicle is gradually decelerated and stopped. If there is a case where the clutch pedal that is still depressed is released, the clutch is normally engaged in a high speed state, and the vehicle suddenly starts, or in some cases, the front part of the machine body is lifted. Therefore, according to the above-mentioned proposed technique, the continuously variable transmission is operated to a low speed position by depressing the clutch pedal, and next time when the depressing of the clutch pedal is released and the main clutch is operated, the vehicle can be started at a low speed, After that, a series of operations of automatically operating to the original high speed position corresponding to the shift lever is automatically performed, and there is an advantage that the driver can start satisfactorily even if he forgets to operate the shift lever at a low speed.

[0004]

However, even if the above-mentioned proposed technique is adopted, inconvenience may still occur. In other words, the relationship between the depression amount of the clutch pedal and the operation timing of the clutch switch is not always constant due to individual differences, assembly errors, etc., and therefore, the start of engagement of the main clutch accompanying the release of the depression of the clutch pedal and the continuously variable transmission If the acceleration does not coincide with the start of acceleration, and the main clutch starts to be engaged with the speed being increased to some extent, the vehicle may suddenly start.

Further, when the engine is stopped and the aircraft is stopped without operating the main clutch in a high-speed running state, to start again, the engine is started with the clutch pedal depressed, and The clutch pedal is released. However, since the deceleration operation of the continuously variable transmission is disabled when the main key is turned off to stop the engine, it is already in a high speed state when the clutch pedal is released and the main clutch is in the transmission state. As a result, there is a possibility that the vehicle may suddenly start.

The object of the present invention is to solve the above-mentioned inconveniences,
An advantage of the present invention is to obtain a speed change control device that can surely enjoy the advantage of being able to start satisfactorily even if the low speed operation of the speed change device is forgotten.

[0007]

[Means for Solving the Problems]

[Configuration] To achieve the above object, the present invention provides a traveling transmission device, a transmission operation mechanism capable of driving and shifting the traveling transmission device, a shift operation tool for manually shifting the traveling transmission device, and a traveling clutch, This is provided with a clutch detection means that operates by being operated across the transmission side and the transmission cutoff side,
When the traveling clutch is operated from the transmission side to the transmission cutoff side, a deceleration means that links the clutch detection means and the speed change operation mechanism so that the traveling transmission is automatically decelerated to a predetermined low speed position, When the traveling clutch is operated from the transmission disengagement side to the transmission side, the traveling transmission is held at a predetermined low speed position for a set time and then automatically increased to the gear shift position corresponding to the operation position of the gear shift operation tool. As described above, the shift control device for the working machine, which is provided with the clutch detecting means and the speed increasing means for linking the shift operating mechanism.

Further, with the operation of turning on the main switch,
It would be advantageous to have interlocking speed reduction means for automatically operating the traveling transmission to a predetermined low speed position.

[Operation] According to the structure of claim 1, when the traveling clutch is operated from the transmission disengagement side to the transmission side, the traveling transmission is not speeded up immediately but for a short time (set time). Since the speed is increased after setting, even if there is a solid error or an assembly error, it can always be brought to a predetermined low speed state when the traveling clutch starts to be engaged.
The sudden start will not occur.

According to the second aspect of the invention, in addition to the operation of the first aspect, the traveling transmission automatically becomes the predetermined low speed position when the main switch is turned on. In addition, even when the engine is started and the vehicle is started with the clutch operating tool kept in the clutch disengaged position, the transmission is always at the predetermined low speed position.
The effect of eliminating sudden start is added.

[Effect] As a result, even in the shift control device according to the first or second aspect, a gentle restarting behavior from a low speed is automatically obtained even if the shift operation tool forgets to return to the low speed position. The advantages can be enjoyed regardless of the existence of various errors in the clutch operating system.

In the speed change control device according to the second aspect of the present invention, the fear of a sudden start at the time of restart of the airframe stop is eliminated, so that there is an advantage that the above effect can be made more reliable.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. A rice transplanter is shown in FIG. 1, 1 is a front wheel, 2 is a rear wheel, 3 is a driving section, 4 is a lifting link mechanism, 5 is a lifting cylinder, 6 is a planting device, 7 is an engine, 8 is a planting clutch, Reference numeral 9 is a main clutch, and 10 is a traveling HST (hydrostatic type continuously variable transmission).

In this rice transplanter, H
ST10 is adopted and an electric control means is used to operate the trunnion shaft 10a. That is, as shown in FIG. 2, an electric cylinder (an example of a speed change operation mechanism) 11 for operating the trunnion shaft 10a, a second linear potentiometer 12 for feedback, and a first amount for detecting the operation amount of the speed change lever 13 are detected. The potentiometer 14 and the control device 15
The gear shift lever 13 is controlled so that the gear shift operation can be performed according to the operation of the gear shift lever 13.

A means for preventing a sudden start at the time of restart due to forgetting to return the shift lever 13 is provided. As shown in FIG. 2, a clutch pedal 16 that manually operates a main clutch (an example of a traveling clutch) 9, a clutch switch (an example of a clutch detection means) 17 that operates by depressing the pedal, and a timer 18.
The main switch 19 and the controller 15 are connected. That is, when the clutch pedal 16 is stepped on, the main clutch 9 is disengaged, and the clutch switch 17 is turned on.
When the clutch pedal 16 is released, the main clutch 9 is turned on and the clutch switch 17 is turned off.
It becomes.

When the main clutch 9 is operated from the power transmission side to the power transmission disengagement side, the deceleration means for connecting the clutch switch 17 and the speed change operation mechanism 11 to automatically decelerate the HST 10 to a predetermined low speed position a. When A and the main clutch 9 are operated from the transmission disengagement side to the transmission side, the HST 10 is held at a predetermined low speed position a for a set time, and then automatically speeded up to a shift position corresponding to the operation position of the shift lever 13. In order to operate, the clutch switch 17, the electric cylinder 11, and the speed increasing means B which links the timer 18 are provided.
In addition, when the main switch 19 is turned on, the HST1
An interlocking deceleration means C for automatically operating 0 to a predetermined low speed position a is provided. The predetermined low speed position a is a place where a gear ratio suitable for a gentle start is revealed, and a fine speed position slightly closer to the high speed side from the neutral position is desirable.

Next, the operation of the speed reducing means A, the speed increasing means B, and the interlocking speed reducing means C will be described with reference to the flow chart shown in FIG. First, it is checked whether or not the main switch 19 has been operated from the OFF position to the ON position to start the engine 7 (# 1). If YES, the electric cylinder 11 is driven to decelerate the HST 10 to a predetermined low speed position a. (# 3). In other words, if the engine is stopped in order to forget to return the speed change lever 13 from the high speed position for traveling to the neutral position and the engine is started to restart the vehicle, the interlocked deceleration is automatically performed so that the speed is returned to the predetermined low speed position a. The means C works.

When # 1 is NO, that is, when the clutch pedal 17 is stepped on and the clutch switch 17 is turned on during engine start such as running, (#
2), decelerate the HST 10 to a predetermined low speed position a (#
3) If the clutch is not operated (# 2), the process returns to the original. That is, when the main clutch 9 is operated from the transmission side to the transmission interruption side, the deceleration means A functions to automatically decelerate the HST 10 to the predetermined low speed position a.

The depressed clutch pedal 16
When the clutch switch 17 is turned off by releasing the depression (# 4) (# 4), the timer 18 is activated to maintain the predetermined low speed position a for the set time (# 5), and then the electric cylinder 11 is driven. Set the HST10 to the predetermined low speed position a
Therefore, the speed increasing means B functions so that the speed is gradually increased to the high speed position corresponding to the operation position of the shift lever 13 (# 6). That is, H when the main clutch 9 starts to engage
In ST10, the vehicle is always at the predetermined low speed position a, and the vehicle can start gently (smoothly) without suddenly starting.

The set time is the time required for the predetermined low speed position a to appear, for example, the electric cylinder 1
It is conceivable to set the time (about 2.5 seconds) required to operate the HST 10 from the maximum speed position to the neutral position with 1. Note that, instead of the timer 18, a mechanical time limit means for providing a play for starting the operation of the electric cylinder 11, or a means for delaying the OFF detection signal output of the clutch switch 17 and outputting it.

[Other Embodiments] The transmission may be a belt continuously variable transmission or a stepped transmission, and the shift operation mechanism 11 may be a set of a hydraulic cylinder and a solenoid valve or a geared motor. Also, as the clutch detecting means,
The oscillating type contact piece is composed of an "ON-OFF-ON" type switch having ON positions on both sides of the OFF position in the middle of the oscillating range, and is turned ON after passing through the OFF position due to the depression of the clutch pedal 16. Decelerates the HST10 and turns it on after passing through the OFF position when the pedal is released.
It is also possible to use a structure in which the HST 10 is operated to speed up.

It should be noted that reference numerals are given in 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]

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

FIG. 2 is a block diagram of a shift control system.

FIG. 3 is a diagram showing a flowchart of a shift control operation.

[Explanation of symbols]

 9 Traveling clutch 10 Traveling transmission device 11 Shifting operation mechanism 13 Shifting operation tool 17 Clutch detecting means 19 Main switch A Speed reducing means B Speed increasing means C Interlocking speed reducing means

Claims (2)

[Claims] 1. A travel speed change device (10), a speed change operation mechanism (11) capable of driving and changing the speed change device, and a speed change operation tool (13) for manually changing the speed of the travel speed change device (10).
A traveling clutch (9) and a clutch detection means (17) which is activated by operating the traveling clutch (9) between the transmission side and the transmission cutoff side, and the traveling clutch (9) is transmitted from the transmission side. When operated to the disengagement side, the clutch detecting means (17) and the shift operating mechanism (11) are linked so that the traveling transmission (10) is automatically decelerated to a predetermined low speed position. When the speed reducing means (A) and the traveling clutch (9) are operated from the transmission cut-off side to the transmission side, the traveling transmission (10) is automatically held after being held at the predetermined low speed position for a set time. And a speed increasing means (B) that links the clutch detecting means (17) and the speed changing operation mechanism (11) so as to increase the speed to a shift position corresponding to the operation position of the speed change operation tool (13). Gearbox of work equipment equipped with Apparatus. 2. The interlocking deceleration means (C) for automatically operating the traveling transmission (10) to the predetermined low speed position when the main switch (19) is turned on. The gear shift control device for the working machine as described in.