JP2004114848A - Transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lightly conduct steering operation with small operation force at the time of low speed while employing a method of interlocking the engine rotation number with speed change. <P>SOLUTION: The rotation number of an engine is interlocked with speed change of a transmission changeable to forward/backward movement. A hydraulic type power steering device driven by the engine is provided. As interlocked with change-over from a neutral state N of the transmission to a first speed F1, the engine rotation number is reversibly and automatically increased up to a first set rotation number n1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transplanter such as a rice transplanter that changes an engine speed of an engine in conjunction with a shift of a transmission capable of switching forward and backward.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a mobile agricultural machine that reversibly and automatically increases an engine speed when a transmission is accelerated forward and backward from a neutral state (for example, see Patent Document 1). .
[0003]
[Patent Document 1]
JP-A-3-194264
[Problems to be solved by the invention]
However, the conventional technique has the following disadvantages.
(1) The operability is excellent because the throttle can be operated in association with the shift operation. However, when the transmission is operated at a low speed, the engine speed does not sufficiently increase, and as a result, the power driven by the engine is reduced. In the case where the steering wheel is provided, the power of the power steering wheel is small and the steering wheel operation is heavy at a low speed.
[0005]
(2) Since the engine speed is higher in the higher gear, the engine speed in the highest gear is sometimes too high and the steering wheel becomes too light.
[0006]
(3) In reverse, the engine speed is low even at the highest gear, so the power of the power steering is too low and the steering operation is heavy.
[0007]
(4) Since the engine speed increases as the speed increases, the power steering becomes too powerful, the steering wheel becomes too light at the speed.
[0008]
An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art.
[0009]
[Means for Solving the Problems]
The features, operations, and effects of the transplanter according to the first aspect of the present invention are as follows.
[0010]
〔Characteristic〕
A transplanter adapted to change an engine speed of an engine in conjunction with a shift of a transmission capable of switching between forward and backward, comprising a hydraulic power steering driven by the engine, wherein the neutralization of the transmission is achieved. The point is that means is provided for reversibly and automatically increasing the engine speed to the first set speed in conjunction with switching from the state to the first speed.
[0011]
[Action]
In response to switching from the neutral state of the transmission to the first speed, the engine speed is reversibly and automatically increased to the first set speed so as to increase the engine speed immediately. Therefore, the power steering can be sufficiently used even at a low speed such as the first speed.
[0012]
〔effect〕
Therefore, it is possible to lightly operate the steering wheel at low speed with a small operation force while adopting a form in which the engine speed is linked with the shift.
[0013]
The features, functions and effects of the transplanter according to the present invention according to claim 2 are as follows.
[0014]
〔Characteristic〕
2. The transplanter according to claim 1, wherein the engine speed is reversibly and automatically increased to a second set speed in conjunction with a shift operation of the transmission to a reverse drive in a neutral state. Is provided.
[0015]
[Action]
In the transplanting machine, a mode in which a hydraulic device for raising and lowering a working device such as a seedling planting device is operated to automatically raise the working device when moving backward may be adopted. In such a case, it is necessary to surely raise the working device by increasing the engine speed and rotating the hydraulic pump driven by the engine among the hydraulic devices at a high speed.
Focusing on the above points, the engine speed is increased to a relatively high speed, such as the second set speed, in conjunction with the switching operation to the reverse in the neutral state of the transmission. The increase in the engine speed is performed before the shift lever is operated to the reverse gear, and as a result, the increase in the engine speed is completed before the reverse is started. The climb can be made without delay.
[0016]
〔effect〕
Therefore, it is possible to surely perform the automatic ascent of the working device at the time of reversing, while adopting a form in which the engine speed is linked to the shift.
[0017]
The features, operations and effects of the transplanter according to the third aspect of the present invention are as follows.
[0018]
〔Characteristic〕
In the transplanter according to the first and second aspects of the present invention, the maximum engine speed during forward movement is set to be larger than the maximum engine speed during reverse movement.
[0019]
[Action]
Since the maximum engine speed at the time of forward movement is set to be higher than the maximum engine speed at the time of reverse movement, in other words, the maximum engine speed at the time of reverse movement is set smaller than the maximum engine speed at the time of forward movement. In addition, the speed does not increase excessively during reverse travel.
[0020]
〔effect〕
Therefore, it is possible to perform reverse traveling at an appropriate speed while adopting a form in which the engine speed is linked to the shift.
[0021]
The features, operations and effects of the transplanter according to the present invention according to claim 4 are as follows.
[0022]
〔Characteristic〕
A transplanter adapted to change an engine speed of an engine in conjunction with a shift of a transmission capable of switching between forward and backward, wherein a hydraulic power steering driven by the engine is provided, and the transmission is moved forward. The point is that the engine speed at the shift speed one stage lower than the highest speed is set to be equal to or higher than the engine speed at the forward highest speed.
[0023]
[Action]
In the case where the engine speed at the highest forward speed of the transmission is set to the maximum, the engine speed at the next lower speed is too small or the engine speed at the highest speed is lower. The engine speed may be too high.
In the former case, the power steering at the next lower gear is lower, and in the latter case, the power steering at the highest forward speed is too effective.
Focusing on the above points, the engine speed at the shift speed one stage lower than the highest forward speed is set to be equal to or higher than the engine speed at the highest forward speed, so the engine speed at the lower speed This ensures that the power steering is fully utilized, while preventing the power steering from being too dominant at the highest forward speed.
[0024]
〔effect〕
Therefore, while adopting a form in which the engine speed is linked to the shift, the power steering at each shift speed is sufficient and the steering wheel operation can be performed lightly with a small operating force.
[0025]
The features, operations, and effects of the transplanter according to the fifth aspect of the present invention are as follows.
[0026]
〔Characteristic〕
A transplanter adapted to change an engine speed of an engine in conjunction with a shift of a transmission capable of switching between forward and backward, wherein a hydraulic power steering driven by the engine is provided, and the transmission is moved forward. The point is that the engine speed at the highest speed stage is set equal to the engine speed at the reverse highest speed stage.
[0027]
[Action]
Since the engine speed at the fastest forward speed and the engine speed at the fastest reverse speed are set to be equal, a sufficient engine speed can be obtained even during reverse running at low speeds. The power steering power can be made sufficient.
[0028]
〔effect〕
Therefore, the steering wheel operation during reverse running can be performed lightly with a small operating force, while adopting a form in which the engine speed is linked to the shift.
[0029]
The features, functions and effects of the transplanter according to the present invention according to claim 6 are as follows.
[0030]
〔Characteristic〕
A transplanter adapted to change an engine speed of an engine in conjunction with a shift of a transmission capable of switching between forward and backward, wherein a hydraulic power steering driven by the engine is provided, and the transmission is moved forward. The point is that the engine speed at the first speed is set higher than the engine speed at the other forward speeds.
[0031]
[Action]
Since the engine speed at the first forward speed is set to be higher than the engine speed at the other forward speeds, and the power steering at the first forward speed is the best, the engine speed will be described later. As shown, by setting the engine speed to decrease toward the highest speed, it is possible to make the power steering less effective at higher speeds. That is, the power steering can be of a speed-sensitive type.
[0032]
〔effect〕
Therefore, while adopting a form in which the engine speed is linked to the gear shift, at low speeds, light steering operation with sufficient power steering can be secured, while at high speeds, wobble due to the steering wheel being too light is prevented. As a result, sufficient running stability can be secured.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
[Embodiment 1]
As shown in FIG. 1, a rice transplanter, which is an example of a transplanter, connects a multiple-row seedling planting device 2 to a rear part of a riding type self-propelled body 1 via a link mechanism 3 so as to be able to move up and down. A hydraulic cylinder 4 is provided to raise the seedling planting device 2 against the weight with the oil supply and to lower the seedling planting device 2 with the weight as the oil is drained.
[0034]
The self-propelled body 1 has an engine 8 and a steering handle 9 arranged and supported at the front of a body frame 7 having a pair of left and right driving front wheels 5 for steering and a pair of right and left driving rear wheels 6. A driver's seat 10 is arranged and supported at the rear of the body frame 7, and a boarding step 11 also serving as a front wheel fender and a rear wheel fender 12 are supported by the body frame 7.
[0035]
The seedling planting device 2 includes a ground float 13 for leveling a field by sliding as the vehicle travels, and a seedling stand 14 for reciprocating with a set stroke in the left-right direction with a plurality of seedlings arranged and placed in the left-right direction. In conjunction with the movement of the seedling rest 14, the unit is circulated up and down between the seedling take-out opening from the seedling rest 14 and the leveled field scene, thereby taking out a unit amount of seedling planted from the seedling rest 14. And a seedling planting mechanism 15 for planting in a leveling field scene.
[0036]
In addition, the rice transplanter is provided with a fertilizer that applies fertilizer to a field in connection with planting.
The fertilizer application device is equipped with a fertilizer hopper 16 and an electrically driven blower 17 that generates an airflow for transferring fertilizer fed from the self-propelled body 1 and travels to the seedling planting device 2. Accordingly, a groove for fertilization is formed in the field, and a groove producing device 19 for supplying the fertilizer conveyed by airflow from the self-propelled body 1 through the hose 18 to the groove is attached.
[0037]
The body frame 7 receives the output from a hydrostatic continuously variable transmission 21 which is driven forward and backward by the engine 8 via a belt transmission 20 and which is a traveling unit (a front drive wheel 5 and a rear drive wheel 6). And a transmission case 22 for distributing the seedlings to the seedling planting device 2. A front frame 23 on which the engine 8 is mounted is connected to a front portion of the transmission case 22, and the driver seat 10 and the like are mounted and supported at a rear portion of the transmission case 22. The rear frame 24 is connected.
[0038]
As shown in FIG. 2, the operation lever for the continuously variable transmission 21, that is, the transmission lever 25, is attached to a detent plate 26 attached to a fixed portion so as to be able to swing back and forth around a horizontal axis x. The detent plate 26 and the trunnion shaft 27 of the continuously variable transmission 21 are interlocked via a linkage mechanism 28 so as to be swingable left and right around an axis y orthogonal to x. The continuously variable transmission 21 is configured to perform a shift operation by swinging back and forth integrally with the detent plate 26 around the horizontal axis x, and is located at a neutral position N of the shift as shown in FIG. By the left and right swinging around the axis y at, the selected position is set in the forward operation guide groove F and the reverse operation guide groove R. The shift lever 25 is urged to swing forward.
[0039]
The detent plate 26 has a fixed portion when the transmission lever 25 is located at each of the forward positions F1, F2, F3, F4, and F5, the neutral position N, and the reverse three positions R1, R2, and R3. By engaging the formed protrusions 29 elastically, recesses 30 are formed at intervals in the circumferential direction which are held at the above-mentioned positions in a state where the shift operation of the shift lever 25 is allowed. The protrusion 29 is attached to the fixed portion in a state where the protrusion 29 is urged by the leaf spring 29a in the engaging direction.
[0040]
The rice transplanter is provided with a hydraulic power steering 31, backup means for raising the seedling planting apparatus 2 in an operation stop state when the continuously variable transmission 21 is operated in reverse, and an engine speed of the engine 8. A speed control means for operating the speed control device 32 to be adjusted based on the speed change state of the continuously variable transmission 21;
[0041]
As shown in FIG. 3, the power steering 31 is driven by the engine 8 to increase the pressure oil supply amount as the engine speed increases. The hydraulic pump 33 includes a torque generator 34 for generating a shaft driving torque. The hydraulic pump 33 also serves as a hydraulic pump for the hydraulic cylinder 4 for elevating.
[0042]
As shown in FIG. 3, the backup means is provided with a sensing lever 35 which is pushed by the shift lever 25 and swings when the shift lever 25 is located in the reverse operation guide groove R, and the sensing lever 35 senses swing. A reverse sensor 36 for detecting the movement is provided, and the electric drive type planting clutch 37 interposed in the transmission system to the seedling planting apparatus 2 is turned off based on the detection of the reverse movement of the reverse sensor 36 and the hydraulic cylinder 4 And a backup control means 39 for operating an electric lifting / lowering control valve 38 to an ascending position based on detection of reverse movement of the reverse sensor 36.
[0043]
As shown in FIG. 3, the speed control means includes a shift sensor 40 using a potentiometer that detects the shift state of the continuously variable transmission 21 based on the swing posture of the detent plate 26 around the left-right axis x. A speed control means 41 for controlling the speed control device 32 based on the detection results of the shift sensor 40 and the reverse sensor 36 is provided. The neutral position of the neutral position N in the forward operation guide groove F is referred to as a forward neutral position Nf, and the neutral position of the reverse operation guide groove R is referred to as a reverse neutral position Nr.
[0044]
The control contents of the speed control means 41 are the following <1> to <10> (see FIG. 4).
<1> When the neutral position N is detected by the shift sensor 40 and the reverse is not detected by the reverse sensor 36, that is, when the continuously variable transmission 21 is at the forward neutral position Nf, the engine speed is reduced to the idling ni. The speed control device 32 is controlled in such a manner.
<2> When the shift sensor 40 detects a switch from the neutral position N to the first forward speed F1, a first set speed n1 at which the engine speed is higher than the idling ni (first forward speed nf1). The speed control device 32 is controlled so as to reversibly and automatically increase the speed up to.
<3> When the speed sensor 40 detects the second forward speed F2, the speed controller 32 is controlled such that the engine speed becomes the second forward speed nf2 higher than the first forward speed nf1.
<4> When the shift sensor 40 detects the third forward speed F3, the speed controller 32 is controlled such that the engine speed becomes the third forward speed nf3 higher than the second forward speed nf2.
<5> When the fourth forward speed F4 is detected by the shift sensor 40, the speed control device 32 is controlled such that the engine speed becomes the fourth forward speed nf4 higher than the third forward speed nf3.
<6> When the fifth forward speed F5 is detected by the shift sensor 40, the speed controller 32 is controlled so that the engine speed becomes the fifth forward speed nf5 higher than the fourth forward speed nf4. 7> When the neutral position N is detected by the shift sensor 40 and the reverse is detected by the reverse sensor 36, that is, when the continuously variable transmission 21 is at the reverse neutral position Nr, the engine speed is higher than the idling ni. The speed control device 32 is controlled so as to reach the second set rotation speed n2.
<8> When the first reverse speed R1 is detected by the shift sensor 40, the speed control device 32 is controlled such that the engine speed becomes the second set speed n2 (the first reverse speed nr1).
<9> When the speed sensor 40 detects the second reverse speed R2, the speed control device 32 is controlled such that the engine speed becomes the second reverse speed nr2 higher than the first reverse speed nr1.
<10> When the third reverse speed R3 is detected by the shift sensor 40, the speed control device 32 is controlled such that the engine speed becomes the third reverse speed nr3 higher than the second reverse speed nr2.
[0045]
The third reverse speed nr3, that is, the maximum engine speed Rmax during reverse driving, is set lower than the fifth forward speed nf5, that is, the maximum engine speed Fmax during forward driving.
[0046]
The first forward speed nf1, the second forward speed nf2, the first reverse speed nr1, and the second reverse speed nr2 are set to 60 to 80% of the maximum engine speed.
[0047]
The backup control means 39 and the speed control means 41 are incorporated in the control device C using a microprocessor.
[0048]
[Embodiment 2]
In the first embodiment, as shown in FIG. 5, the speed control device 32 controls the speed control device 32 so that the third reverse speed nr3 becomes equal to the fifth forward speed nf5. In the second embodiment, the fourth forward speed nf4 and the fifth forward speed nf5 are set to be the same, and the third reverse speed nr3 is set to be the same as the fifth forward speed nf5. is there.
[0049]
[Embodiment 3]
In the second embodiment, as shown in FIG. 6, the fifth forward speed nf5 is lower than the fourth forward speed nf4.
[0050]
[Embodiment 4]
In the first embodiment, as shown in FIG. 7, when the first forward speed F1 is at the minimum speed, the engine speed of the first forward speed nf1 is maximized, and the second forward speed nf2 is sequentially set. The engine speed is reduced as the number of revolutions in the third forward speed nf3, the fourth speed in the forward speed nf4, and the fifth speed in the forward fifth speed nf5 are reduced. In this case, when the vehicle is in the first forward speed F1, the power steering 31 acts most strongly, and the steering handle 9 becomes lightest. The steering wheel 9 becomes heavier as the vehicle speed increases and the traveling speed increases. Power steering.
[0051]
[Embodiment 5]
In the fourth embodiment, as shown in FIG. 8, when the second forward speed F2 is under the actual working condition where the speed is the lowest, the second forward speed nf2 is maximized. In this case, in actual work, when the vehicle is in the second forward speed F2, the power steering 31 acts most strongly to make the steering handle 9 lightest, and as the speed increases, the steering handle 9 becomes heavier. It becomes steering.
[0052]
In the embodiment, since the engine speed is increased and the hydraulic pump 33 is driven at a high speed before the reverse travel is executed, the hydraulic oil is sufficiently supplied to the hydraulic cylinder 4 to quickly start the seedling planting apparatus 2. Can be raised.
[Brief description of the drawings]
FIG. 1 is a side view of a rice transplanter according to Embodiment 1. FIG. 2 is a side view of a speed change operation system according to Embodiment 1. FIG. 3 is a control block diagram according to Embodiment 1. FIG. FIG. 5 is a diagram showing a relationship between a shift speed and an engine speed. FIG. 5 is a diagram showing a relationship between a shift speed and an engine speed in the second embodiment. FIG. 6 is a diagram showing the relationship between the shift speed and the engine speed in the third embodiment. FIG. 7 is a diagram illustrating a relationship between a shift speed and an engine speed according to a fourth embodiment. FIG. 8 is a diagram illustrating a relationship between a shift speed and an engine speed according to a fifth embodiment. ]
21 Transmission 8 Engine 31 Power steering n1 First set speed n2 Second set speed Rmax Maximum engine speed Fmax during reverse drive Maximum engine speed F1 during forward drive First forward speed

Claims (6)

A transplanter adapted to change an engine speed of an engine in accordance with a shift of a transmission capable of switching between forward and backward, wherein a hydraulic power steering driven by the engine is provided, and the transmission is neutralized. A transplanter provided with means for reversibly and automatically increasing the engine speed to a first set speed in conjunction with switching from the state to the first speed. 2. The transplanter according to claim 1, further comprising means for reversibly and automatically increasing the engine speed to a second set speed in conjunction with the operation of switching to reverse when the transmission is in a neutral state. 3. The transplanter according to claim 1, wherein the maximum engine speed during forward movement is set to be larger than the maximum engine speed during reverse movement. What is claimed is: 1. A transplanter adapted to change an engine speed of an engine in conjunction with a shift of a transmission capable of switching between forward and backward, wherein a hydraulic power steering driven by said engine is provided, and said transmission is moved forward. An implanter wherein an engine speed at a shift speed one stage lower than the highest speed is set to be equal to or higher than the engine speed at the forward highest speed. What is claimed is: 1. A transplanter adapted to change an engine speed of an engine in conjunction with a shift of a transmission capable of switching between forward and backward, wherein a hydraulic power steering driven by said engine is provided, and said transmission is moved forward. A transplanter in which the engine speed at the highest speed and the engine speed at the reverse highest speed are set equal. What is claimed is: 1. A transplanter adapted to change an engine speed of an engine in conjunction with a shift of a transmission capable of switching between forward and backward, wherein a hydraulic power steering driven by said engine is provided, and said transmission is moved forward. An implanter in which the engine speed at the first speed is set to be higher than the engine speed at the other forward speeds.

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