JPH08163902A - Moving controlling device for agricultural working machine - Google Patents

Abstract

(57) [Summary] [Purpose] To safely and reliably perform a turning operation in an agricultural work machine equipped on a traveling vehicle so as to be able to move up and down. [Structure] A position lever (51) for raising and lowering an agricultural working machine (8) that is mounted on a traveling vehicle (1) so as to be able to move up and down.
And the speed governing device (53) of the engine (52) are interlockingly connected by a mechanical connecting system (59), and the rotation control of the engine (52) is performed in conjunction with the lifting operation of the agricultural work machine (8).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilling rotary working machine in which the traveling speed of a traveling vehicle during tilling work is increased to shorten the tilling work time by the tilling rotary.

[0002]

2. Description of the Related Art When a vehicle travels to a turning point in ordinary plowing work, the working machine equipped on the traveling vehicle is raised each time and the traveling speed is appropriately reduced to ensure work safety. .

[0003]

However, performing the raising / lowering operation of the working machine and the shifting operation of the traveling speed each time as described above are troublesome in operation and lack in safety. These operations are indispensable for high-speed work, and further simplification of operability has been desired.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a position lever for raising and lowering an agricultural work machine which is mounted on a traveling vehicle so as to be able to move up and down and an engine speed governing device are interlockingly connected by a mechanical connecting system, It controls the rotation of the engine in conjunction with the raising and lowering operation of the agricultural work machine. The engine rotation speed is changed to increase or decrease in conjunction with the raising or lowering operation of the work machine by the position lever, and the non-working state is changed from the working state. It is possible to easily and reliably switch the work mode from the state or the non-work state to the work state, thereby improving work efficiency and safety.

Further, when an elastic body is incorporated in a mechanical connecting system for connecting the position lever and the speed governing device of the engine, when the working machine is lowered from the raised position by the lowering operation of the position lever, the engine speed is instantaneously changed. To increase the running speed from low speed to high speed, without returning.
By gradually returning to the original high speed state, dashing is prevented and the smooth switching from low speed to high speed of the machine is possible.

Further, a dead zone that delays the speed control start operation by the position lever by a certain amount is provided in the connection system with respect to the speed control device of the engine so as to provide flexibility in connecting the speed control device to the position lever. As a result, it is possible to improve the assemblability of these components and facilitate and surely enable the speed control operation of the speed control device by the position lever.

Further, for the speed governor of the engine,
A dead zone that delays only the speed adjustment start operation when raising the position lever from the lowered position by a certain amount is provided in the connection system, and the engine speed decreases due to the dead zone when raising the work machine from the lowered position. Delay, and work accuracy is improved by performing work in a normal high-speed traveling state until the work machine reaches a non-working position of a predetermined height or more.
When lowering the work implement from the raised position, at the same time as starting the descent, raise the engine speed to the predetermined speed early,
At the time of starting the descending work of the working machine, the work can be always performed under a proper and stable high-speed traveling speed, and the safety and stability in this work are improved.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is an explanatory view of an accelerator portion, FIG. 2 is a side view of the whole, FIG. 3 is a plan view of the same, FIG. 4 is a side view of a rotary tiller, and FIG. 5 is a floating explanatory view of a rear cover. In the figure, (1) is a tractor which is a traveling vehicle having front and rear wheels (2) and (3), and the steering wheel (5) in front of the driver's seat (4) changes the direction of the front wheel (2) to change the traveling course. It is configured to change. Note that (6a) is a main shift lever, (6b) is a sub shift lever, and (6c) is a PTO shift lever.

The lower link (7) is attached to the tractor (1).
Side-drive type tillage rotary working machine (8)
And a PTO shaft (10) of the tractor (1) via a drive shaft (10a) with a universal joint.
The input shaft (9a) is connected to the shaft to transmit power. Beams (11) are projected to both sides from the side surface of the gear box (9), support plates (12) are fixedly installed in the middle of each of the beams (11), and a lower link is provided at a front end of the support plate (12). A pin for pivotally connecting (7) is provided in a protruding manner, the front end of the depth frame (13) is pivotally supported at the rear end, and the top link (15) is pivotally connected at the front end of the mast (14). .

As shown in FIG. 7, an upper portion of a chain case (16) is fixed to the outer end of the beam (11), and a plowing pawl shaft (17) is laid horizontally on the lower portion of the chain case (16).
A large number of cultivating claws (18) made of nata claws are radially planted on the cultivating claw shaft (17) in a side view, and a rotary cover (19) is provided above the rotation locus of the cultivating claw (18).
, And both sides are covered by side covers (20). Then, the tilling claw shaft (17) is driven via a gear inside the gear box (9), a transmission shaft inside the beam (11), a sprocket and a chain inside the chain case (16), and the tilling claw (18) ... I am trying to cultivate by rotating.

8 to 9, a first plate (21a) is fixedly provided in front of the beam (11), and a second plate (21a) is provided at the front end of the plate (21a).
The supporting rod (22) is laid horizontally via the b), and the supporting rod (2) is
2) The mounting plate (23) is fixed to the mounting plate (23), and the upper part of the cutting blade (24) is fixed to the mounting plate (23) with a bolt (23a).
Four are attached in the left-right width direction via. Further, the middle part (24a) of the cutting blade (24) is curved rearward so that the middle part (24a) faces the front part of the rotary claw locus (L) of the tilling claw (18), and is lower than the middle part. The tip side is inclined forward so as to have a receding angle (α). That is, the intermediate portion (24a) of the cutting blade (24) is arranged so as to overlap with the front portion of the rotary claw locus (L) of the tilling claw (18) in a side view, and the cutting blade (24) and the tilling claw are arranged. The space between (18) is narrowed to prevent residual tillage, and the working machine (8) is raised by the plowing resistance during the plowing work by the underground plunging action of the cutting blade (24). It's suppressed. However, the cutting blade (2
The number of attachments in 4) is not limited, and may be appropriately spaced so as not to cause tilling resistance.

Further, a first steel plate rear cover (26) is vertically swingably connected to the rear end of the rotary cover (19) above the tilling claw (18) via a first fulcrum shaft (25), 1 The front end of the second rear cover (27) made of an elastic material such as synthetic resin or rubber is fixed to the rear end of the rear cover (26), and the front end of the steel plate third rear cover (28) is fixed to the rear end of the second rear cover (27). , A second fulcrum shaft (29) at the rear end of the first rear cover (26) and a third fulcrum shaft (30) at the front end of the third rear cover (28) are connected by a pair of left and right links (31) (31), Third fulcrum axis (3
0) is provided substantially coaxially with a fourth fulcrum shaft (32), the lower end of the first suspension rod (33) is connected to the fourth fulcrum shaft (32),
The lower ends of the pair of left and right second suspension rods (35) are connected to the fifth fulcrum shaft (34) at the rear end of the third rear cover (28), and the first and second support members (36) of the first rear cover (26) are connected to each other. Second
The upper ends of the suspension rods (33) (35) are attached so as to be able to move up and down, and the suspension rods (33) (35) and the third rear cover (28) form a triangle in a side view, and the second, third and third suspension covers are formed. A side view triangle is formed by a line connecting the five fulcrum shafts (29), (30) and (34), and the third rear cover (28) is centered on the second fulcrum shaft (29) or the third fulcrum shaft (30). Is moved upward in the directions of arrows (A) and (B), and the cover (28) uses the second fulcrum shaft (29) and the suspension rod (33) (35) connecting portion of the support (36) as a fulcrum. Also, the third rear cover (28) whose forward movement is restricted by the downward protrusion of each rod (33) (35) by the operation of the lever mechanism of each rod (33) (35) is moved backward in the direction of arrow (C). Move it upwards, and as shown in FIG.
Floating operation is performed in which both sides of the rear cover (28) move back and forth in the direction of arrow (D) in plan view. Also,
A pair of left and right gas dampers (3) having a substantially constant pressure between the fifth fulcrum shaft (34) and the support (36) of the first rear cover (26).
Even if the tractor (1) tilts to the left or right, the third rear cover (28) is supported by a gas damper (37) that is connected to the third rear cover (7) to obtain a substantially constant spring constant for the entire stroke and to form a large stroke. The third rear cover (28) is configured so that the tilling surface can be leveled by evenly pressing the left and right sides. The gas damper (37)
Instead of this, an oil damper or a multiple coil spring may be used.

Further, the upper end side of the suspension rods (33) (35) is loosely fitted and inserted into the bearing bodies (38) of the support bodies (36) so as to come into contact with the upper surface side of the bearing bodies (38). (3
3) Pins (35) prevent the rods (33) (35) from being pulled out downward, and prevent the movement of the third rear cover (28) in the direction opposite to the arrows (A) (B) (C). The lower ends of the pair of left and right rods (40) (40) wound with the springs (39) (39) are attached to the first rear cover (2).
6) Connected to the upper surface, the upper end side of the rod (40) is slidably attached to the support (41) of the rotary cover (19), and the first rear cover (26) is pressed by the spring (39). are doing.

The rake support (42) is detachably fixed to the upper surface of the third rear cover (28), and the rake (43) fixed to the support (42) is extended to the rear of the third rear cover (28). I'm putting it out.

Further, as shown in FIG. 6, the shaft (44) of the support (36) to which the upper end of the second suspension rod (35) is mounted.
The upper end of the gas damper (37) is connected to, and the second suspension rod (35) and the gas damper (37) are provided as close to each other as possible and substantially parallel to each other.

Further, the rear covers (26) (27)
One first suspension rod (3
3) is positioned, the left and right rods (40) and (40) are arranged on the left and right sides of the first suspension rod (33), and the left and right rods (40) and (40) are further arranged on the left and right outer sides of two sets of left and right pairs. Two
The suspension rod (35) and the gas damper (37) are arranged, and the left and right links (31) and (31) are arranged further on the left and right outer sides of the second suspension rod (35) and the gas damper (37). The left and right side ends of the three rear covers (26) and (27) are connected by the left and right links (31) and (31).

As shown in FIG. 7, the plowing claw shaft (17) is also provided.
The transmission shaft in the beam (11) and the chain case (1
6) The drive force input to the input shaft (9a) is transmitted through the chain in the inside to rotate the plowing pawl (18). The left and right sides of the plowing pawl shaft (17) for expanding the plowing width are provided. The eccentric claws (47) are attached and the left and right eccentric claws (47) are attached.
Plowing claws (18) are attached in multiple rows at approximately equal intervals therebetween.

The above-mentioned tilling claws (18) are of a holder mounting type, and a plurality of them are provided on the same plane in the radial direction with respect to the tilling claw shafts (17). Four holders (48) are provided in the radial direction at 90 ° intervals on the circumference of the same cross section of (17).

The holder (48) is equipped with a tilling claw (18) consisting of a naginata-shaped nata claw, and the tip of the tilling claw (18) is cut or cut so that the soil can be inverted. Alternately bent into 1
Holders (48) arranged in a line on the circumference so that the bending directions of the tillers (18) facing each other at 80 ° are the same in the right or left direction.
Two are attached to each.

Further, as shown in FIGS. 8 to 10, opposing plowing pawls (18) (1) mounted on the left and right holders (48).
The base interval (T) in 8) is set to a large interval of 5, whereas the interval (t) which is the tip claw locus (L) gap is approximately 1.
(T: t≈5: 1), and in the embodiment, when the turning radius a is about 245 mm,
Base interval (T) is 200mm, tip claw locus (L)
The space (t) is opened with a space of about 40 mm, the base space (T) is made large, and the number of attachments of the plowing pawls (18) is reduced, thereby reducing the required power and maintaining the same power. It is configured so that the surplus capacity at the time of plowing can be turned to speed to enable high-speed plowing.

That is, the plowing claws (18) have a large curving width (b) (b≈80 mm) with a large curving width (b) (b≈80 mm) by curving the soil and then scooping the soil so that the tip side is greatly curved laterally. 18a) is formed into an easily deformable elastic claw, and when the plowing claw (18) is driven into the soil, the horizontal component force of the bending portion (18a) pushes the soil in the curved lateral direction, and the plowing claw ( 18) by the lateral repulsive force when elastically deforming in the anti-curvature direction by the resistance load of the soil, the scooping soil is extruded in the lateral direction substantially parallel to the tiller shaft (17) shown by the arrow in FIG. Thus, the soil portion remaining as residual tillage is crushed between the tip loci (L) of the opposing left and right tillage claws (18), and the residual tillage is effectively prevented from being formed. . Further, in this case, when the claw (18) rotates to the vicinity of the cutting point and the resistance load of the soil becomes small, the soil portion left as residual tillage is crushed from the lateral direction due to the restoring elastic force due to the elastic deformation at the time of driving the claw (18). Then, the crushing effect is further improved, and the cutting soil itself is also subjected to a strain force due to the elastic return force so as to crush the soil into soft and fine soil. In other words, it is possible to reduce the required power by making it possible to perform work that does not leave residual tillage while cultivating in the state where residual tillage remains, with a minimum claw configuration.

In this way, by setting the number of the tilling claws (18) of the rotary working machine (7) to about 70% of that of the conventional rotary working machine, for example, high speed tilling which doubles the traveling speed of the conventional rotary working machine can be performed. It makes it possible.

As shown in FIGS. 8 and 9, a partition plate (49) having a substantially triangular shape is arranged between the rear portion of the cutting blade (24) and the rotary cover (19). A partition plate (49) is fixedly installed on the back side, and the partition plate (49) and the cover (19) are brought close to each other so as to minimize the distance between the partition plate (49) and the cover (19) such as straw and weeds. It is provided so as to prevent it from entering, and the side on the rear side is formed into an arcuate blade portion so that the straw or the like is guided downward and the straw is cut at the same time. The partition plate (4
The width (plate thickness) (H) of 9) is the blade width (h) of the cutting blade (24).
It is formed to be slightly smaller (H <h) than that, so that straw, weeds and the like do not get entangled in the cutting blade (24) and a good cutting is possible.

As shown in FIGS. 1 and 11, a position lever (51) is provided on the hydraulic lift device (50) of the tractor (1) to move up and down the rotary working machine (8).
To the speed governor (5) of the engine (52) of the tractor (1).
3) is linked and linked to the vertical movement of the position lever (51) to control the rotation speed of the engine (52) up and down. The governor lever (54) of the speed governor (53) has a hand accelerator lever. (55) and the foot accelerator pedal (56) together with the position lever (51) are the accelerator wire (57) (58) which is an accelerator connection system.
Each lever (51) is connected in triplicate via (59).
It is provided so that the engine speed can be changed by independently operating each of (55) and the pedal (56).

The governor lever (54) is connected to the flyweight (64) via, for example, a speed control spring (60), a floating lever (61), a governor sleeve (62), and a bell crank (63), and the engine (52). When the rotational speed of the camshaft (crankshaft) (65) of (1) increases and the centrifugal force of the flyweight (64) increases,
The control rack (66) of the fuel injection valve connected to the floating lever (61) is moved against the spring (60) to reduce the fuel injection amount and the engine speed.

When the governor lever (54) is rotated in the direction of the arrow in FIG. 11 by operating the accelerator levers (55) and accelerator pedals (56) and by lowering the position lever (51), the control rack (66) is moved. Is pulled rightward to increase the fuel injection amount and increase the engine speed to increase the traveling speed.

This embodiment is constructed as described above. Conventionally, for example, the number of claws per one rotation of the claw shaft (17) is one, the claw shaft rotation speed is about 170 rpm, and the vehicle speed is 0.5 m / s. The work to be carried out in step 2 is carried out by setting the number of claws per rotation of the claw shaft (17) to two, the claw shaft rotation speed is approximately 170 rpm, and the vehicle speed is 1
It is carried out under working conditions of up to 1.5 m / s, and the working speed is substantially doubled or more than that of the conventional one, and work efficiency is greatly improved.

When the traveling speed is increased as described above, the higher the traveling speed is, the more the traction resistance of the rotary working machine (8) is increased, and the upslip phenomenon occurs in the tilling rotary. When the cutting blade (24) is moved, the working machine (8) is floated, but the downward force at the time of moving the cutting blade (24) having a receding angle that plunges into the soil and the cutting blade (2)
4) The force of pressing the side surface with soil acts as the pulling-out resistance force of the cutting blade (24) to prevent the working machine (8) from rising.

Further, the cutting blade (24) is overlapped with the soil plunging point of the plowing claw (18) so as to substantially coincide with the soil plunging point in a side view, and the cutting blade is used for cutting the soil of the plowing nail (18). The soil is cut by (24), and the cut soil is easily cultivated by the plowing claw (18) to reduce the load in the plowing work and to cut weeds and the like entwined with the claw (18). It is possible to eliminate and prevent the growth of weeds in the soil.

During cultivating work at high speed, the tractor (1) reaches the turning point and the position lever (5)
When the rotary working machine (8) is raised by the raising operation of 1), the pulling force of the control rack (66) is weakened to reduce the fuel injection amount and lower the engine speed. The traveling speed is reduced to make a safe turn.

After turning, the position lever (5
When the rotary working machine (8) is lowered by the lowering operation of 1) and the tilling work is performed again, the pulling force of the control rack (66) is strengthened to increase the fuel injection amount and increase the engine speed. As a result, the cultivating work is performed at a high speed with the traveling speed being approximately twice as fast as the conventional one, and the work efficiency can be improved.

12 to 13 show the position of the position lever (51) and the governor lever (54) by connecting the position of the accelerator wire (59) to the position of the accelerator wire (59) which is an elastic body. During the acceleration operation of the speed governor (53) by lowering the lever (51), the return tension force of the speed governor spring (60) and the accelerator delay spring (6)
Due to the extension delay of these springs (60) and (67) due to the extension force of 7), abrupt gear shift to the high speed side is suppressed, and smooth acceleration from low speed to high speed is possible without dashing the aircraft. It is configured as follows.

14 to 16 show that an intermediate link (68) for switching between high speed and low speed is provided in the middle of an accelerator wire (59) connecting the position lever (51) and the governor lever (54). , Airframe (1a)
An intermediate link (68) rotatably via a support shaft (69)
Of the base end boss (68a) of the
In the bottomed cylindrical spring receiver (70) provided in a), the spring (7)
1), the ball (72) is enclosed, and the support shaft (6
The ball (72) is switchably engaged with notches (73a) (73b) for high speed and low speed which are formed adjacent to each other by sandwiching the ridge (69a) in 9) and the length formed in the intermediate link (68). The other end of the rod (75) into which the bent portion is movably inserted into the hole (74) is connected to the position lever (5).
1) and the wire mounting plate (76) protruding from the boss (68a) and the governor lever (54) are connected by the accelerator wire (59) to the position lever (5).
At the time of lowering and raising of 1) to the descending and ascending positions, the intermediate link (68) is rotated so that the high speed and low speed notches (73a) (73b) have the balls (72).
Are engaged with each other to hold the intermediate link (68) in position so that the engine speed can be reliably switched between large and small stages.

Further, as shown in FIGS. 15 and 16, when the position lever (51) is moved to the raised and lowered positions, the intermediate link (68) has a long hole (74) at the high speed side end and the low speed side end. A dead zone (F1) (F2) of a certain width is provided between the rods (75) to operate the lever (51) from the raised position to the lowered position and from the lowered position to the raised position immediately after the start of the operation ( While the rod (75) is moving along F1 (F2), only the raising and lowering operation is performed, and the rod (75) abuts the high speed side end and the low speed side end of the elongated hole (74) to form an intermediate link. The position lever (51) is provided with a governor lever (54) so as to decrease and increase the engine speed when the (68) rotates.
The flexibility is ensured at the time of connection, and the control of changing the engine speed by the position lever (51) is performed safely and reliably.

Further, as shown in FIG. 17, the long holes (7
When the dead band (F1) on the high speed side in 4) is eliminated, and only the dead band (F2) on the low speed side is provided, when the position lever (51) is operated from the raised position to the lowered position, the engine speed increases immediately. It is configured to stabilize the running by increasing the running speed at an early stage by starting the.

[0036]

As is apparent from the above embodiments, the present invention provides an agricultural working machine (8) equipped on a traveling vehicle (1) so as to be able to move up and down.
A mechanical connection system (5) for connecting a position lever (51) for raising and lowering the engine and a speed governor (53) of the engine (52).
Since the rotation control of the engine (52) is performed by interlocking with the agricultural work machine (8) by interlocking with each other by means of 9), the work machine (8) by the position lever (51).
The engine speed can be controlled to increase or decrease in conjunction with the ascending or descending operation of the engine so that the work mode can be easily switched from the working state to the non-working state or from the non-working state to the working state. It is possible to improve work efficiency and safety.

Further, since the elastic body (67) is incorporated in the mechanical connection system (59) for connecting the position lever (51) and the speed governing device (53) of the engine (52), the position lever (51) When the work implement (8) is lowered from the raised position by the lowering operation of (51), the engine speed is instantly increased to gradually return the traveling speed from the low speed to the high speed without returning to the high speed. It is possible to return to the original state, prevent dashing, and enable smooth switching of the machine body from low speed to high speed.

Further, the speed control device (5) of the engine (52)
In contrast to 3), since the dead band (F1) (F2) that delays the speed control start operation by the position lever (51) by a certain amount is provided in the connection system (59), the position lever (51) is adjusted. It is possible to improve flexibility in assembling the speed control device (53) to improve the assemblability thereof, and to adjust the speed control device (5) by the position lever (51).
It is possible to make the speed control operation of 3) easy and sure.

Furthermore, the dead zone (F2) for delaying only the speed control start operation when the speed control device (53) of the engine (52) is raised from the lowering position of the position lever (51) by a certain amount, Since it is provided in the connection system (59), when the working machine (8) is raised from the lowered position, the dead zone (F2) delays the reduction of the engine speed, so that the working machine (8) Work accuracy can be improved by performing work in a normal high-speed running state until the non-working position of a predetermined height or more is reached, and the work machine (8)
When lowering from the ascending position, the engine speed is raised to a predetermined speed at the same time as the descent is started, and at the time of starting the descent work of the working machine (8), the engine speed is always kept at an appropriate and stable high speed. I can make work possible,
There is a remarkable effect that the safety and stability in this work can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an accelerator unit.

FIG. 2 is an overall side view.

FIG. 3 is an overall plan view.

FIG. 4 is a side view of a rotary working machine for tillage.

FIG. 5 is a side view illustrating a rear cover portion.

FIG. 6 is an explanatory plan view of a rear cover portion.

FIG. 7 is a rear view of the rotary tillage section.

FIG. 8 is a side view of a rotary tillage section.

FIG. 9 is a front explanatory view of a cultivating rotary portion.

FIG. 10 is a rear view for explaining the cultivating rotary section.

FIG. 11 is an explanatory diagram of a drive system of a governor.

FIG. 12 is an explanatory diagram of a position lever portion.

FIG. 13 is an explanatory diagram of a governor drive system.

FIG. 14 is an explanatory diagram of a position lever portion.

FIG. 15 is an explanatory diagram of an intermediate link unit.

FIG. 16 is an explanatory diagram of an intermediate link unit.

FIG. 17 is an explanatory diagram of an intermediate link unit.

[Explanation of symbols]

 (1) Tractor (traveling vehicle) (8) Working machine (51) Position lever (52) Engine (53) Speed governor (59) Wire (coupling system) (67) Spring (elastic body) (F1) (F2) Dead zone

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Mr. Taku Shika, 1-1, Ishishiba, Matsumoto City, Nagano Prefecture 1-1-1, Ishikawajima Shibaura Machinery Co., Ltd. Matsumoto Plant (72) Inventor, Akihiko Kitabayashi 1 Ishishiba, Matsumoto City, Nagano Prefecture 1st-1 Ishikawajima Shibaura Machinery Co., Ltd. Matsumoto Plant (72) Inventor Akihiko Maezawa 1-1-1 Ishishiba Matsumoto City, Nagano Ishikawajima Shibaura Machinery Co., Ltd. Matsumoto Plant (72) Inventor Shinsawa Fujisawa 1-1-1 Ishishiba, Matsumoto-shi, Nagano Ishikawajima Shibaura Machinery Co., Ltd. Matsumoto factory (72) Inventor Masahiko Miyamoto 1-1-1 Ishishiba, Matsumoto-shi, Nagano Ishikawajima Shibaura Machinery Co., Ltd. Matsumoto factory (72) Inventor Koji Hiroshi 1-1-1, Ishishiba, Matsumoto City, Nagano Prefecture Ishikawajima Shibaura Machinery Co., Ltd. Matsumoto Factory

Claims (4)

[Claims] 1. A mechanical control system interlockingly connects a position lever for raising and lowering an agricultural work machine that is mounted on a traveling vehicle so that the agricultural work machine can be moved up and down. A traveling control device for an agricultural work machine, which is configured to control rotation of an engine. 2. The travel control device for an agricultural work machine according to claim 1, wherein an elastic body is incorporated in a mechanical connection system that connects the position lever and the speed governor of the engine. 3. The traveling control device for an agricultural work machine according to claim 1, wherein a dead zone for delaying the speed control start operation by the position lever by a certain width is provided in the connection system with respect to the speed control device of the engine. 4. The dead band for delaying only the speed control start operation at the time of raising the position lever from the lowering operation position to the engine speed control device by a certain width is provided in the connecting system. The traveling control device for the agricultural work machine described.