JP3407173B2 - Tractor drive control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device for a tractor that pulls, for example, a tilling rotary working machine for tilling by a tractor. 2. Description of the Related Art Conventionally, a tilling rotary working machine is mounted on a rear side of a tractor so as to be able to ascend and descend, and the cultivating work is performed by the rotary working machine. It was desired to finish the work early. [0003] The above-mentioned prior art is characterized in that when the output of a PTO shaft for transmitting the driving force to the work machine is controlled by a PTO clutch, when the engine speed of a tractor is high, or when the work machine When the driving load is large, P
When the TO clutch is engaged, the load on the engine changes abruptly and greatly, so that a large impact is likely to be generated. SUMMARY OF THE INVENTION The present invention is directed to a tractor drive apparatus including a PTO clutch for controlling a tractor PTO shaft output and an output adjustment member for controlling a tractor engine speed. A PTO clutch sensor for detecting the PTO clutch engagement operation, and a controller for automatically performing a rotation speed reduction control of the output adjustment member based on the detection of the PTO clutch sensor. Automatically lowers the engine speed, even if the engine is rotating at a high speed or a large working machine with a large driving load is installed, the engine load may suddenly change when the PTO clutch is engaged. Eliminates the problem of generating large shocks and easily improves the operability of the PTO clutch What you get. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is an engine control circuit diagram, FIG. 2 is an overall side view, FIG. 3 is a plan view of the engine control circuit, and FIG. 4 is a side view of a tilling rotary working unit. In the figure, reference numeral (1) denotes a tractor, which is provided with left and right front running wheels (4) and (4) on both sides of a hood (3) in which an engine (2) is installed, and a steering handle at the rear of the hood (3). (5), a driver's seat (6) is installed behind the steering wheel (5), and left and right rear traveling wheels (7) and (7) are installed on both sides of the driver's seat (6). (6) The left and right brake pedals (9) and (9) and the clutch pedal (10) are provided in the front step (8), so that the operator travels while sitting on the driver's seat (6). ing. A tilling rotary working machine (1) is mounted on a transmission case (11) for driving the running wheels (4) and (7) via a lower link (12) and a top link (13).
4), and the work implement (14) is mounted on the rear side of the tractor (1) so as to be able to move up and down freely.
5), a position control lever (16) for raising and lowering the work machine (14) by manual operation, and a lifting switch (17) for raising and lowering the work machine (14) to a direction change ascending position and a tilling work lowering position by one-touch operation. ) Is arranged on the right side of the driver's seat (6), and the traveling auxiliary shift lever (18) and the PTO shift lever (19) for changing the output to the work implement (14) are connected to the driver's seat (6). Place it on the left. Further, as shown in FIGS. 4 to 7, a gear box (20) is arranged at the center of the work machine (14).
Power is transmitted from the PTO shaft (21) of the tractor (1), and beams (22) protrude from both sides of the gear box (20), and a support plate (23) is provided on each halfway of the beam (22). A lower link (12) is connected to a front end of the support plate (23), and a front end of a depth frame (24) is pivotally supported at a rear end of the support plate (23). Left and right tail wheels (25) (25) are provided on the rear end side. An upper part of the chain case (26) and an upper part of the side support (27) are fixedly provided at an outer end of the beam (22), and a tilling claw shaft (28) is provided between the lower part of the chain case (26) and the lower part of the side support (27). ), A large number of rotary claws (29)... Composed of nata claws are radially implanted on the tilling claw shaft (28) in a side view, and the rotation locus of the rotary claw (29) is above. Rotary cover (3
0), and both sides are covered by side covers (31). The tillage claw shaft (28) is driven via a gear in the gearbox (20), a transmission shaft in the beam (22), a sprocket and a chain in the chain case (26), and a rotary claw (29) ... Can be tilled by rotating the handle, and the handle (3
By the rotation operation of 2), the rotary cover (30) can be rotated back and forth about the axis of the tillage claw shaft (28). Then, a plate (33) fixed to the beam (22) is projected forward, and the plate (33)
A support rod (34) is horizontally mounted on the front end, and a mounting plate (35) is fixed to the support rod (34).
The upper part of the cutting blade (36) is fixed to 5). In addition,
Four cutting blades (36) are attached to the outer side of the machine from the lower link (12) in the left-right width direction, and the middle part of the cutting blade (36) is curved backward and inclined forward and backward.
The linear lower part of 6) faces backward in the front part of the rotation locus of the rotary claw (29). That is, in the side view, the lower part of the cutting blade (36) is arranged so as to overlap the front part of the rotation locus of the rotary claw (29), and the interval between the cutting blade (36) and the rotary claw (29) is reduced. To prevent tillage. However, the outer two cutting blades (36) (36) are provided between the rotary claw (29) and the amplification rotary claw (37). Also, a cutting blade (36)
Between the rear surface of the rotary cover and the rotary cover (30).
8) is provided. That is, the partition plate (38) is fixed to the back surface of the cutting blade (36), and the partition plate (38) is brought close to the rotary cover (30) so that straw, weeds and the like do not enter and become entangled. ing. In addition, the partition plate (3
8) is formed in a triangular shape, the upper side is adapted to the shape of the inside of the rotary cover (30), and the front side is adapted to the shape of the rear surface of the cutting blade (36) so as to be tightly fixed. The rear side is formed in an arc shape to guide straw or the like downward. The width (thickness) of the partition plate (38) is smaller than the width of the cutting blade (36) so that straw, weeds, and the like are not entangled. A first rear cover (40) made of a steel plate is connected to the rear end of the rotary cover (30) above the rotary pawl (29) via a first fulcrum shaft (39) so as to be vertically swingable. The front end of the second rubber rear cover (41) is fixed to the rear end of the first rear cover (40), and the leveling space (4
The front end of the third steel plate rear cover (43) is fixed to the rear end of the second rear cover (41) forming 2), and the second fulcrum shaft (44) at the rear end of the first rear cover (40) and the third rear cover (43). 43) The third fulcrum shaft (45) at the front end is connected by a pair of left and right links (46) (46), and the fourth fulcrum shaft (47) is provided substantially coaxially with the third fulcrum shaft (45).
The lower end of the first suspension rod (48) is connected to the fourth fulcrum shaft (47), and a pair of left and right second suspension rods (50) is connected to the fifth fulcrum shaft (49) at the rear end of the third rear cover (43). The lower ends are connected, and the upper ends of the first and second suspension rods (48) and (50) are attached to the support (51) of the first rear cover (40) so as to be able to move up and down. And a third rear cover (43) to form a triangle in side view, and second, third, and fifth fulcrum axes (44), (45), (49).
The third rear cover (43) is moved upward about the second fulcrum shaft (44) or the third fulcrum shaft (45), and the second fulcrum shaft (4) is formed.
4) and the suspension rods (48) (50) of the support (51)
The third rear cover (43) is moved rearward and upward by the operation of the two lever mechanisms with the connecting portion as a fulcrum, and a floating operation is performed in which both sides of the third rear cover (43) move back and forth in plan view. A pair of left and right gas dampers (52) is connected between the fifth fulcrum shaft (49) and the support (51) of the first rear cover (40), so that a small spring constant can be obtained with a large initial load and the stroke can be reduced. The third rear cover (43) is formed by a gas damper (52) that can be formed large.
, And even if the tractor (1) is tilted left and right, the tilling surface can be leveled by pressing the third rear cover (43) left and right evenly. The upper ends of the suspension rods (48) and (50) are loosely inserted into the bearings (53) of the supports (51) so that the pins contact the upper surfaces of the bearings (53). (5
4) is implanted in the rods (48) and (50) to prevent the rods (48) and (50) from being pulled out downward, to limit the forward movement of the third rear cover (43), and to use the springs (55) and (50). 55) and a pair of left and right rods (5
6) (56) The lower end is connected to the upper surface of the first rear cover (40), and the upper end of the rod (56) is connected to the rotary cover (3).
The first rear cover (40) is slidably mounted on the support (57) of (0), and is configured to be elastically pressed downward by the spring (55). A rake support (58) is detachably fixed on the upper surface of the third rear cover (43), and a rake (59) fixed to the support (58) extends rearward of the third rear cover (43). And a support (51) to which the upper end of the second suspension rod (50) is attached as shown in FIG.
The upper end of the gas damper (52) is connected to the shaft (60) of the second suspension rod (50) and the gas damper (52) are provided as close to each other as possible and substantially parallel to each other. A pair of left and right tail wheels (25) and (25) are attached to the ends via a support frame (61).
5) The rake (59) is disposed between (25). The tail wheel (25) prevents the rake (59) from colliding with a ridge or the like when the headland changes direction, and allows the vehicle to travel on the road or The tail wheel (25) is also used as a bumper on the left and right outer sides in a maintenance work or the like when lifted upward. Further, a first fulcrum shaft (39) is attached at a position substantially equal to or higher than the upper end of the rotation locus of the rotary claw (29), and the rear cover is centered on the first fulcrum shaft (39) during tilling work. (40) As a result of the rise of (41) and (43), a leveling space (42) having a large area is formed below the rear covers (40), (41) and (43) behind the rotation locus of the rotary pawl (29). Rear cover (40) (4
1) The soil pushed forward by (43) is
9) Prevents reaching the soil jumping part and prevents the increase of the tilling load of the rotary claw (29) due to the tilling work at high speed. During the tilling work, the rotary claw (29) is pulled out to the ground. The rear covers (40), (41) and (43) are lifted and arranged by cultivated soil on an arc line having a radius centered on the point where the rotary claw is formed, and have a size of about 50% or more of the area of the rotation locus of the rotary claw (29). The leveling space (42) is moved to the rear side of the rotary track of the rotary pawl (29) and the rear cover (40) (4).
1) A small object such as fine soil or light soil is formed between (43) and is scattered to a high position on the lower surface of the rotary cover (40) (41) by a rotary claw (29), and a large earth or heavy earth or a stump ( Large stuff such as rice plant) is scattered to a lower position by the rotary claw (29), and the small stuff becomes the upper layer due to the specific gravity separation action by the scatter of the rotary claw (29), and the large stuff becomes the lower layer, and the small stuff of the upper layer Is leveled by the rear covers (41) and (43),
The large rake is pushed further down by the rear rake (59). Therefore, the large-sized material maintains good air permeability and water permeability inside the cultivated soil, and the cultivated soil surface layer is formed by the small-sized material in a state suitable for sowing or seedling transplantation. Further, four rotary claws (29) are arranged on the same circumference around the cultivating claw shaft (28) at intervals of 90 degrees.
Are attached, and the tip side of each rotary claw (29) is alternately curved in the left-right direction, and four single-row rotary claws (29) ...
Are provided in a plurality of rows in the direction of the axis of the tilling claw shaft (28).
A gap is provided between the tips of the rotary claws (29) and (29) that are adjacent in the left-right direction, the width of the right and left sides of the rotary claw (29) is about twice as large as the gap at the tip, and the left and right rotary claws (29) are formed. (29) The rotary pawl (29) is formed so that the base end interval is about five times as large as the tip end interval.
Further, the rotary claw (29) is bent into a shape of scooping after cutting off the soil, and the left and right rotary claws (29) (29) crush the remaining tillage by the return force of the elastic deformation of the rotary claw (29). The number of rotary pawls (29)... Which is about 70% of the number of conventional rotary pawls is attached, and the rotational speed of the rotary pawl (29) is reduced to the conventional rotational speed (about 200 to 400 per minute). Rotation), the running speed of the tractor (1) is about twice as high as the conventional running speed (about 0.5 meters per second), and the work efficiency is improved without increasing the tillage load compared to the conventional one. It is configured so that the tilling work can be performed by doubling it. Further, the cutting blade (36) is made to penetrate into the soil at a position overlapping with the rotary claw (29) in the soil when viewed from the side, and the soil intruding portion of the cutting blade (36) is inclined backward and supported. , And the left and right sides of the cutting blade (36) are formed with uneven planes having a width,
A downward force in which the cutting blade (36) enters the soil by traction and a force in which the cut soil presses against the side surface of the cutting blade (36) due to a restoring force are generated as pull-out resistance of the cutting blade (36). The pulling-out resistance of the cutting blade (36), which is substantially equal to or slightly larger than the soil rush resistance of the rotary claw (29), raises the entire tilling rotary working machine (14) upward by the soil rush resistance. The rotary claw (29) is configured to prevent the lift from being lifted and to reduce the impact generated by the entry into the ground. In addition, on the rear side of the cultivating claw shaft (28), a reaction force of the rotary claw (29) extraction force is generated in opposition to the reaction force (lifting force) of the leveling force of the rear covers (40), (41), and (43). The posture is stabilized by the balance of each reaction force. FIG. 8 is a traveling drive system diagram of the tractor (1). The main transmission gear group (6) for transmitting the output of the engine (2) through the friction plate type main clutch (62).
3) and a PTO transmission gear group (64) and a forward / reverse switching gear group (65) provided at an input stage of the main transmission gear group (63).
And a front wheel for transmitting a shift output to the left and right front running wheels (4) via a front gear group (67) and an auxiliary gear group (66) provided at an output stage of the main gear group (63). Drive shaft (6
8) and a rear wheel drive shaft (70) for transmitting a shift output to left and right rear running wheels (7) (7) via a rear differential mechanism (69).
Is provided. And each gear group (63) (65) (66)
And the front and rear traveling wheels (4) and (7) are driven via the respective drive shafts (68) and (70). Also, P
A forward gear (71) is provided at the input stage of the TO transmission gear group (64).
And reverse rotation gear (72) and forward / reverse switching gear (73)
And a switching gear (73) is meshed with one of the forward and reverse gears (71) and (72) to rotate the rotary claw (29) forward to perform a tilling operation, and the rotary claw (29) Is reversed to detach the attached straw grass and mud. A PTO clutch (75) is provided on a PTO input shaft (74) for transmitting the engine (2) output to the PTO transmission gear group (64), and the PTO clutch lever (76) shown in FIG. Clutch (7
5) is turned on or off to drive or stop the rotary claw (29). The PTO clutch (75) may have either a friction plate structure or a locking claw engagement structure. Further, as shown in FIG. 1, a limit switch type PTO clutch sensor (77) for detecting the on / off operation of the PTO clutch lever (76) and an operation position of an accelerator lever (78) for manual operation are detected. Potentiometer type accelerator sensor (79) and engine (2)
An electronic governor (80) that controls the speed of rotation by increasing or decreasing the number of revolutions by controlling the fuel supplied to the engine by a solenoid or the like, and a pickup type rotation sensor (81) that detects the number of revolutions of the engine (2) by a microcomputer. It is connected to the governor controller (82). The accelerator lever (78) is held at the operated position, and the electronic governor (80) operates based on the set rotational speed of the accelerator sensor (79) to adjust the rotational speed of the engine (2). Operating the engine (2) at the set rotation speed of the accelerator lever (78),
When the O clutch lever (76) is operated from the PTO clutch (75) disengaged position to the engaged position, the PTO clutch sensor (77) detects the engaged operation and the electronic governor (80)
Performs the operation of lowering the number of revolutions of the engine (2) to reduce the number of revolutions of the engine (2).
The PTO clutch sensor (77) uses a PTO clutch lever (76) so that the time from when the PTO clutch sensor (77) detects the engagement operation of the clutch lever (76) until the PTO clutch (75) engages is shortened.
Entering operation timing is set. As described above, a PTO clutch (75) for controlling the output of the PTO shaft (21) of the tractor (1) is provided, and an output adjusting member for controlling the engine (2) rotation speed of the tractor (1). In a tractor drive device provided with an electronic governor (80), a PTO clutch (75) is provided.
A PTO clutch sensor (77) for detecting the on-coming operation is provided, and a controller (82) for automatically performing the rotation speed reduction control of the electronic governor (80) based on the detection of the PTO clutch sensor (77) is provided. (75) Since the turning-on operation is detected and the engine (2) rotation speed is automatically reduced, even if the engine (2) is rotating at a high speed, or a large work machine (14) having a large driving load.
Even when the PTO clutch (75) is mounted, the problem that the load of the engine (2) suddenly changes when the PTO clutch (75) is engaged and a large impact is generated is eliminated. As shown in the flow chart of FIG. 9, the operation of engaging the PTO clutch (75) by the PTO clutch lever (76) is performed by the PTO clutch sensor (7).
7), when the value of the accelerator sensor (79) is smaller than 50 to 80% of the rated speed of the engine (2), the PTO is maintained while maintaining the set speed of the accelerator lever (76). The clutch (75) is engaged and the engine (2) rotates at a rated speed of 50 to 80.
When the value of the accelerator sensor (79) is larger than the percentage of revolutions, the electronic governor (80) is automatically operated by detecting the operation to enter the PTO clutch sensor (77),
The number of revolutions of the engine (2) is reduced to 50 to 80% of the rated number of revolutions, and the impact generated by the operation of engaging the PTO clutch (75) is reduced. After the engine (2) rotation speed reduction control, the PTO clutch (7
5) When a predetermined time that is substantially equal to the ON operation time elapses, the electronic governor (80) automatically operates to increase the engine (2) rotation speed based on the value of the accelerator sensor (79) and set the accelerator lever (76). Automatically return to the rotation speed,
It is configured to perform agricultural work. Further, as shown in the flowchart of FIG. 10, the operation of engaging the PTO clutch (75) by the PTO clutch lever (76) is performed by the PTO clutch sensor (7).
7) When the electronic governor (80) is detected, the electronic governor (80) is automatically activated, and the value of the accelerator sensor (79) is 50 to 8
It is also possible to reduce the rotational speed to 0% or the idling rotational speed, whichever is higher, to reduce the shock generated by the operation of engaging the PTO clutch (75). As is clear from the above embodiment, the present invention provides a PTO clutch (75) for controlling the output of the PTO shaft (21) of the tractor (1) and the engine of the tractor (1). 2) In a tractor drive device provided with an output adjusting member (80) for controlling the number of revolutions,
A controller (82) for providing a PTO clutch sensor (77) for detecting the operation of engaging the clutch (75), and for automatically performing a rotation speed reduction control of the output adjusting member (80) based on the detection of the PTO clutch sensor (77); Since the rotation of the engine (2) is automatically reduced by detecting the operation of engaging the PTO clutch (75), even if the engine (2) is rotating at a high speed or a large driving load is applied. Even if the work machine (14) is mounted, the PTO
It is possible to eliminate the problem that the load of the engine (2) suddenly changes during the operation of engaging the clutch (75) and generate a large impact, and the operability of the PTO clutch (75) can be easily improved.

[Brief description of the drawings] FIG. 1 is an engine control circuit diagram. FIG. 2 is an overall side view. FIG. 3 is a plan view of the same. FIG. 4 is a side view of a rotary tilling machine. FIG. 5 is a side view of a rotary claw portion. FIG. 6 is a plan view of a rear cover. FIG. 7 is a rear view of the rotary claw portion. FIG. 8 is a drive explanatory diagram of the tractor. FIG. 9 is a flowchart of FIG. 1; FIG. 10 is a flowchart showing a modification of FIG. 9; [Explanation of symbols] (1) Tractor (2) Engine (21) PTO shaft (75) PTO clutch (77) PTO clutch sensor (80) Electronic governor (output adjustment member) (82) Electronic governor controller

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-284097 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01B 67/00 A01B 71/02 B60K 17 / 28

Claims (1)

(57) [Claim 1] PT for controlling PTO shaft output of tractor
In a tractor drive device provided with an O-clutch and an output adjusting member for controlling an engine speed of the tractor, a PTO clutch sensor for detecting an operation of engaging the PTO clutch is provided, and the output adjusting member is controlled based on the detection of the PTO clutch sensor. A tractor drive control device provided with a controller for automatically performing a rotation speed reduction control.