JPH0326055Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of the steering structure of a riding rice transplanter.

BACKGROUND ART Conventionally, a riding rice transplanter generally has a final case 3 of a front axle 2 in the front part of a transmission case 1, and a sector shaft 4 in the center in the longitudinal direction, as shown in FIGS. 8 and 9. , a steering structure in which a horizontally long drag link mounting plate 5 is fixed to the downwardly projecting end of the sector shaft 4, and a drag link 6 arranged vertically to the mounting plate 5 is connected via a joint 7. There are many things that we have.

Problems to be Solved by the Invention However, the above-mentioned steering structure has some inconveniences due to the nature of the rice transplanter, which operates by traveling on the rice field.

That is, the drag link mounting plate 5, which is located below the transmission case 1 and arranged horizontally, tends to push muddy water etc. while driving in a wet field, which not only increases running resistance, but also prevents the drive link mounting plate 5, which is located below the transmission case 1, from pushing muddy water etc. There were concerns about the protection of transmission case 1 since it was directly exposed to mud, etc. Also, drag link 6 in the vertical direction.
are arranged, so when used for vehicles with different toreads due to an increase or decrease in the number of planting rows, the angle difference of the drag link 6 from the steering part toward the front axle 2 is arranged in the lateral direction. This results in inconveniences such as not being able to adjust the rotation angle or not being able to use the Atsukerman method, which necessitates changes to the front axle 2 and steering side in addition to the drag link 6, leading to higher costs. There were other drawbacks.

Means for Solving the Problems Therefore, the present invention has been devised to provide a transmission case in front of the traveling aircraft, in which the steering shaft is inserted and supported in the front part near the gear shift lever, and the steering shaft and gears such as the traveling system transmission gear are housed inside. A sector shaft interlocked with the steering shaft is installed in the front lower part of the transmission case with one end protruding below the transmission case, and the rotational force of the steering shaft is transferred to the transmission gear group. It is structured so that the transmission is transmitted from the front part to the sector shaft by bypassing the lower part of the transmission gear group, and front axles supporting the front wheels are fixedly installed on both sides of the rear part of the transmission case. A drag link mounting plate formed in the shape of a wide band is provided on the sector axis, and the drag link mounting plate is arranged in a vertically long shape in the front and back direction along the lower surface of the transmission case.
The above problem is solved by extending the drag link from the mounting plate in the width direction of the machine.

Function The drag link mounting plate is arranged in a longitudinally long manner along the bottom surface of the transmission case, which reduces running resistance caused by muddy water etc. hitting the mounting plate. Since it has a shape that covers the bottom of the transmission case in the front and back direction, it also protects the transmission case and can effectively protect the drag link. Furthermore, since the drag link is arranged so as to face laterally with respect to the fuselage, the difference in the direction of the drag link due to the tread difference is reduced, and even if a tread difference occurs, it can be dealt with simply by changing the link length.

Embodiment 10 is a riding traveling part, 11 is a planting part, and the planting part 11 is attached to the rear of the riding traveling part 10 so as to be movable up and down by a mounting device 12, thereby forming a riding rice transplanter.

The traveling body K of the passenger traveling section 10 has a pair of left and right front wheels 13 and a pair of rear wheels 14 at the front and rear thereof, and an engine 15 is mounted on the front part.
A transmission 16 is provided above between 3 and 13. Reference numeral 17 denotes a transmission case in which a steering shaft 20 is inserted and supported in a front portion close to a speed change lever 30, which will be described later, and gears such as speed change gears for a traveling system and a PTO system are housed inside. 18 is the driver's seat, 1
Reference numeral 9 denotes a steering handle, and the base of the steering shaft 20 of the handle 19 is inserted into the front part of the transmission case 17 and meshed with the sector gear 21. In the above-mentioned transmission 16, as shown in FIG.
7, an input shaft 23, a speed change gear shaft 24, a rear wheel drive shaft 25, a working part drive shaft 26,
The hydraulic drive shafts 27 are arranged in front of the front wheel drive shafts 22, respectively. The speed change gear shaft 24, the working part drive shaft 26, and the hydraulic drive shaft 27 are arranged near the input shaft 23. Further, since the large gear 27a fixed to the hydraulic drive shaft 27 is arranged so as to be inserted into the recessed part 21a of the sector gear 21, the position of the sector gear 21 can be set upward by that amount, and the steering shaft 20 can be made as short as possible. Furthermore, the mission case 17 can be made smaller and lighter, and its cost can be reduced.

Furthermore, a tension clutch 2 is connected between the input shaft 23 of the transmission 16 and the output shaft 15a of the engine 15.
It is interlocked by a transmission belt 29 equipped with 8. 30 is the gear shift lever, 31 is the rear wheel PTO shaft, 3
2 is the working part PTO axis. 34 is the front axle housing, and 35 is the final case of the front axle.The caster angle is set to 0°, and like the conventional product with a caster angle, the inside wheel tilts upward when the steering wheel is operated to push mud. Care has been taken to minimize inconveniences such as encouraging

Reference numeral 36 denotes a sector shaft interlocked with the steering shaft 20. The sector shaft 36 is located below the front of the transmission case 17 and has one end (lower end) protruding below the transmission case 17. The rotational force (steering force) of the steering shaft 20 is transmitted from the front part of the transmission gear group H to the sector shaft 36 via the sector gear 21, bypassing the lower part of the transmission gear group H. It is composed of Further, at the protruding lower end of the sector shaft 36, there is a drag link mounting plate 37, which is formed into a thin plate shape in side view and a wide band shape in plan view, and is elongated longitudinally in the front and back direction along the lower surface of the transmission case 17. It is arranged in a shape. In the illustrated example, the drag link mounting plate 37 is fixed in a state extending from the front to the rear along the lower surface of the mission case 17, and the drag link 38 is attached to the joint at the extending end. 38a. In addition, the mission case 17 is the first
As shown in the figure, the joint 38a is set at a higher position than the lowest part of the transmission 16, and the mounting height of the drag link 38 is raised by that amount. The drag link 38 extends from the drag link mounting plate 37 in the machine width direction. In the illustrated example, the drag link 38
passes between the mounting plate 38 and the transmission case 17 and extends in the width direction of the machine, that is, in a horizontally elongated shape. In addition, the mounting plate 37 is attached to the drag link mounting portion 3.
7a is bent halfway in the longitudinal direction so that it is approximately horizontal to the ground surface and perpendicular to the final case 35. 39 is a knuckle arm.
6 and 7 show a structure in which a protection plate 40 is fixed in a horizontally oblong shape to the front end of the drag link mounting plate 37, and this protection plate 40 protects the bottom of the transmission not only when moving straight but also when rotating. It is configured to be wider than the width W of the transmission case 17 so that it can generally be covered, and is set at a position slightly higher than the mounting plate 37 so as not to be disadvantageous against running resistance. Also, stoppers 41 are fixed to the left and right sides of the protection plate 40, and when the rotation limit position is reached during steering operation, the stoppers 41 hit the heads of bolts 42 fixed to the transmission case 17 and stop. ing. Reference numeral 43 denotes an engine frame that supports the engine 15. This frame 43 is fixed to the transmission case 17 with bolts (fastened at three points A, B, and C) with the steering shaft 20 sandwiched therebetween, so that the frame 43 is mounted forward of the front wheel shaft 13a. By dispersing the strength of the attachment part of the engine frame 43 that overhangs the engine frame 43, the strength of the transmission case 17 can be constructed without increasing the strength of some parts, and it also prevents rattling of the engine frame 43 and prevents damage to the transmission when the steering is locked. It has also become possible to have a protective effect. Further, due to the above arrangement of the engine frame 43 and the transmission case 17, the rear side of the engine frame 43 is in a wrap state that covers the front side of the transmission case 17 from the outside when viewed from the side, and the engine frame 43 is wrapped around the transmission case 17. Care has been taken to ensure that it also has a protective effect. Reference numeral 44 denotes a main transmission section disposed near the steering shaft 20 so that both sides have substantially the same inclination;
It is housed in the lower center cover 46, and between the center cover 46 and the seat cover 47, there is no protrusion by the main transmission part 44 like in the conventional one, and the steering shaft 20 is moved closer to the transmission lever 30. In combination with being supported on the front portion of the case 17, the step 48 has a completely flat deck structure. Further, the steering operation system such as the steering shaft 20 and the sector gear 21 is compactly arranged in a single transmission case 17 together with the gear group H such as the transmission gear of the traveling system, and the steering shaft 20
Since the rotational force of 0 is transmitted from the front part of the transmission gear group H to the sector shaft 36 by bypassing the lower part of the transmission gear group H, the longitudinal length of the transmission case 17 can be made as short as possible, so that the steering operation Separately install a steering gear box etc. exclusively for the system,
Alternatively, there is no need to extend the front side of the transmission case 17 forward for a long time in order to secure a storage space for the interlocking part from the steering shaft 20 to the sector shaft 36, which only reduces the number of parts and costs. It is now possible to contribute to making the aircraft smaller and more compact.

In the above configuration, when the steering handle 19 is operated to rotate the steering shaft 20, the meshing sector gear 21 and sector shaft 36 rotate, and the drag link 38 is rotated through the mounting plate 37. movement, and the front wheels 13 are steered.

Incidentally, the mounting plate 37 of the drag link 38 is formed into a thin plate shape when viewed from the side and a wide band shape when viewed from above, and is arranged in a longitudinally elongated shape along the lower surface of the transmission case 17 in the front-rear direction. Therefore, compared to the mounting plate 5 that protrudes horizontally from the center of the transmission case 1 as in the conventional example shown in FIGS. 37 has a shape that covers the bottom of the mission case 16 long from below in the longitudinal direction, and the drag link mounting plate 37 covers the widthwise middle part of the bottom of the mission case (the lowest height from the ground) not only when the aircraft is moving straight but also when turning. part)
The drag link mounting plate 37
serves as a protective plate that protects the lower part of the mission case 17. Therefore, the durability of the transmission case and the transmission is greatly increased.

In addition, the drag link mounting portion 37 of the mounting plate 37
Since a is configured to be horizontal and perpendicular to the final case 35, the sector axis 3
6 can improve the durability of the joint 38a of the drag link 38.

Furthermore, since the drag link 38 is arranged to pass between the mounting plate 37 and the transmission case 17 and face in the width direction of the machine, the difference in the direction of the drag link 38 due to the tread difference is reduced, and it is possible to increase or decrease the number of planting rows. Even if the present invention is used in a vehicle with a different tread, it is not necessary to change the front axle 34 or the steering part A, that is, the basic structure can be used without changing, and it is possible to significantly reduce costs. can.

Effects of the invention As described above, the present invention has a transmission case in which the steering shaft is inserted and supported in the front part close to the gear shift lever, and the steering shaft and a group of gears such as the transmission gear of the traveling system are housed in the front part of the traveling aircraft. A sector shaft interlocked with the steering shaft is installed in the front lower part of the transmission case with one end protruding below the transmission case, and the rotational force of the steering shaft is applied to the front of the transmission gear group. Front axles supporting the front wheels are fixed to both sides of the rear part of the transmission case, and are thin plate-like in side view and wide in plan view. A drag link mounting plate formed in the shape of a belt is provided on the sector axis,
The drag link mounting plate is disposed along the lower surface of the transmission case in a long longitudinal direction in the front and back direction, and the drag link extends from the mounting plate in the width direction of the machine. It is not necessary to separately provide a steering gear box dedicated to the operation system or to extend the front side of the transmission case forward for a long time, so the front and rear length of the transmission case can be shortened as much as possible, reducing the number of parts and cost. In addition, by arranging the steering shaft and gear shift lever close to each other, the upwardly protruding part of the step part can be eliminated, making it easier to make the step part a flat deck. Compared to a model equipped with an oblong drag link mounting plate when driving in a wet field, the running resistance caused by collisions with mud etc. can be greatly reduced. In order to fulfill the function of a protection plate, the machine body tends to sink during planting work and is exposed to a harsh work environment.
It is possible to prevent wear, deformation, and damage of the transmission case due to contact with mud or obstacles, greatly increasing its durability. Even when used in a vehicle of the same size, the difference in the direction of the drag link is reduced, and the cost can be reduced by simply changing the length of the drag link without changing the basic configuration such as the front axle or steering section. Not only can a large reduction be achieved, the drag link can also be effectively protected, and the steering mechanism can be simplified.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the mission, Figures 2 to 4
The figures are a plan view, a front view and a side view of the main parts, respectively.
The figure is an overall side view of a riding rice transplanter equipped with this invention.
FIG. 6 is a side view showing how the protective plate is attached, FIG. 7 is a bottom view thereof, FIG. 8 is an overall side view showing a conventional example, and FIG. 9 is a bottom view of essential parts of the conventional example. In the figure, 13 is the front wheel, 16 is the transmission, 17 is the transmission case, 20 is the steering shaft, 30
is a gear shift lever, 34 is a front axle, 35 is a front axle final case, 36 is a sector axis, 37 is a drag link mounting plate, 38 is a drag link, H is a gear group such as a traveling system transmission gear, K
is a running aircraft.

Claims (1)

[Scope of utility model registration request] A transmission case is provided at the front of the traveling body, and the steering shaft is inserted through and supported in the front part near the speed change lever, and the steering shaft and a group of gears such as the travel system transmission gear are installed inside the transmission case. A sector shaft interlocked with the steering shaft is installed internally with one end protruding below the transmission case, and the rotational force of the steering shaft is diverted from the front of the transmission gear group to the lower part of the transmission gear group. The front axle supporting the front wheels is fixed to each side of the rear of the transmission case, and the drag link mounting plate is formed into a thin plate shape in side view and a wide band shape in plan view. was provided on the sector axis, and the drag link mounting plate was arranged in a longitudinally elongated shape along the lower surface of the transmission case in the front and back direction, and the drag link was extended from the mounting plate in the width direction of the machine. A steering structure for a riding rice transplanter characterized by the following.