JPH0441021Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a steering device for a mobile agricultural machine such as a riding rice transplanter, a seeding machine, or a tractor.

<Prior Art> Conventionally, as shown in Japanese Utility Model Application Publication No. 58-143768, a steering device for a mobile agricultural machine as described above has a sector shaft that protrudes from the bottom of the machine body and rotates in conjunction with a steering shaft. There is a structure in which the center of the rocking plate is fixed integrally, and both ends of the rocking plate and the end of the front wheel's knuckle arm are connected by drag links, and the plate is protruded from the upper surface of the rocking plate at symmetrical positions. However, there has been known a mechanism in which the left and right projecting ends of a through bolt inserted through the bottom of the fuselage are brought into contact with each other to regulate the left and right rotation angle of the rocking plate, that is, the steering angle of the front wheels.

<Problems to be solved by the invention> However, in the conventional mechanism described above, both ends of the rocking plate rotate in the front and back direction, and in order to obtain the drive amount of the drag link, the plate for the stopper is mounted at the bottom of the transmission. Because it has to be located on the outside, the oscillating plate becomes longer in the left-right direction, resulting in a structure that is susceptible to resistance when running below the transmission. Particularly in areas such as deep muddy farmland, there is a problem in that the swing plate and stopper members all act as large resistance elements.

<Means for solving the problems> The device of the present invention for solving the above problems is as follows:
A swinging arm 39 whose base end is attached to the sector shaft 37 projecting from the lower part of the mission case 13 and whose swinging end projects approximately along the direction of movement of the aircraft is provided so as to be able to swing left and right. A restrictor 47 that comes into contact with the swing arm 39 at the end position of the left-right swing of the transmission case 13 to regulate its swing angle is attached to the transmission case 13.
The restrictor 47 is attached to the lower side surface of the transmission case 13, and the restrictor 47 has a U-shape or a U-shape with an open front end in plan view, and is hugged from both sides and the back side of the lower part of the transmission case 13 which is formed into left and right divisions. It is something to do.

<Operation> The end portion of the swing arm 39 swings in the left-right direction as the sector shaft 37 rotates, thereby rotationally steering the front wheel 17 via the drag link 41 and the axle arm 42. At this time, the swing arm 39
The upper engaging parts 39, 39 are connected to the restrictor 47 at the rear.
a, 47a to restrict its rotation angle, and when the aircraft is moving straight, the swing arm 39 protrudes along the direction of movement of the aircraft.

<Example> An example of the device of the present invention will be described below in detail with reference to the drawings. Fig. 4 is a schematic side view of a riding rice transplanter equipped with the device of the present invention. 3, and horizontal steps 9 are formed in a wide space around the driver's seat 5 and the bonnet 7 to facilitate movement during machine operation, work, and walking. The engine 11 is located approximately in the center of the bonnet 7.
However, a transmission case 13 is provided at the lower center of the step 9, a front wheel 17 is connected to the front of the lower part of the fuselage 1 through a front axle case 15, and a rear wheel is connected to the rear of the lower part through a rear axle case 19. 21 is attached. A planting section 25 is attached to the rear of the body 1 via a link 23. The lower end of the steering shaft 27 with the handle 26 attached thereto is inserted into the mission case 13 incorporating the steering mechanism 29 (FIG. 3). A belt 35 is wound between the engine pulley 31 and the transmission pulley 33.

A sector shaft 37 of the steering mechanism 29 protrudes from the front of the bottom of the transmission case 13 (see Figures 1 and 2), and here the rear end of a rectangular plate-shaped swing arm 39 that extends forward is attached. One end of left and right drag links 41 are rotatably connected to the front end of the swing arm 39 via a spherical shaft 43, respectively.

As described above, the front end of the swing arm 39 is swinged by the sector shaft 37 of the annual steering mechanism 29, and the swing arm 39 performs steering operation via the drag link 41 and the axle arm 42. Engagement parts 45, 45, which serve as stoppers on the movable side, are protrudingly provided at symmetrical positions on the upper surface, whereas engagement parts 45, 45, which serve as stoppers on the movable side, are provided at the rear of the swinging arm 39 on the bottom surface of the mission case 13. Restricting tools 47a, 47a for restricting the left and right swing limit positions of the joining parts 45, 45 are installed on the body side of the mission case 13, etc., and the restricting tools 47a, 47a are provided.
In the illustrated example, constitutes a front-open U-shaped integral restrictor 47, and the engaging portions 45, 4
The lower part of the transmission case 13 is clamped from both sides so that both ends thereof are located at symmetrical positions on the rotation locus of the transmission case 5, and is fastened and fixed with bolts 49.
This bolt 49 also serves as a bolt for penetrating and tightening the divided surface 51 of the halved transmission case 13, and the U-shaped restriction tool 47 is integrated by tightening the halved transmission case 13. It has the function of making it sturdy and protecting its rear side from collision objects when the vehicle is moving backwards.

Both ends of the step 9 are formed in a straight line along the straight direction of the vehicle, as shown by solid lines in FIG. It is located approximately at the center of the left and right width.

With this structure, for example, when loading and unloading the aircraft onto a vehicle, when driving on a road board when entering and exiting a field, or when driving on a narrow road, the front or rear wheels can be turned off at the end of the step. Once the operator confirms the position of either wheel, there is no need for the operator to turn around and check the position of the other wheel, which is located opposite to the direction of travel, and the wheel is prevented from coming off, making driving easier and safer.

Incidentally, the same effect can be achieved by sizing the left and right ends of the step 9 so as to substantially follow the outer surface of the rear wheel 21, as shown by imaginary lines in FIG.

On the step 9 in front of the driver's seat 5, as shown in FIG. As shown in the figure, guide portions 57 are formed linearly in the left and right directions in accordance with shift patterns such as neutral N, reverse R, first gear F ₁ , and second gear F ₂ . A spring 61 is tensioned between the base end of the gear shift lever 53 and a spring hook 59 that protrudes laterally from the outer periphery of the case of the steering shaft 27, so that the gear shift lever 53 is always pushed forward with a predetermined force. Forced. As a result, when the shift lever 53 is operated to N, which is located between shift patterns _F1 and R, the shift lever 53 is moved by the spring 6.
1, it always stands up swinging forward.

This mechanism secures the space above the driver's seat step when the gear shift lever 53 is set to neutral.
The operability of preventing such operations and the workability of replenishing seedlings are improved, and the shift pattern is linear, so these advantages are further enhanced.

63 is a rectangular plate that is installed approximately horizontally using the space between the rear wheels 21, 21 of the riding rice transplanter, and its front end is aligned with the rear wheels of the machine frame 3, and the rear axle cases 19, 19, etc. It is horizontally placed and fastened onto a plurality of bosses 65 protruding from the top surface. This plate 63 is normally attached by removing the planting work part 25, and
For example, a fertilizer applicator, fertilization tank, pest control machine, storage tank for fertilizers, chemicals, etc. can be installed on top of the aircraft, making effective use of the space between the rear wheels of the aircraft and allowing the aircraft itself to be used for a wide range of purposes. It is also possible to connect a PTO shaft for planting work to the machine mounted on the plate 63 and use it as another working machine.

<Effects of the invention> According to the device of the invention configured as described above,
The swinging arm attached to the sector shaft is mounted in the front-rear direction, and the swing angle regulating device is also mounted along the lower side of the transmission case without protruding laterally, so the width in the left-right direction as a whole is smaller than that of conventional models. It is narrower than the structure, and even when the lower part of the transmission case is in contact with the field, the width of contact with the soil surface is narrower, reducing running resistance. Therefore, there is no need to increase the size to increase strength.

In addition, the swing end of the swing arm can be made to protrude forward and upward, and in that case, the drag link and its connection point can be made higher, and the rod link system under the vehicle body can be configured higher, so when driving or working. It has the advantage of protecting the rod link system and improving working conditions in the field.

Furthermore, since the regulating device is U-shaped or U-shaped, and the front end is made into an open end to serve as the abutting regulating section, there is no need to provide a mounting seat or mounting hole on the bottom of the mission case, and the left and right dividing surface of the mission case is This has the effect of improving integral fixation and providing sufficient protection and reinforcement of the lower end of the mission case.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS.
Both figures are a bottom view and a partially cutaway side view showing the main parts of the device of the present invention, FIG. 3 is a schematic plan view thereof, and FIG. Figure 5 is a plan view of the rice transplanter, Figure 6 is a partial rear view of the rice transplanter, Figure 7 is a partial side view of the speed change lever mechanism, and Figure 8 is a partial plan cross-sectional view showing the installed state of the speed change lever. be. 1... Airframe, 3... Frame, 13... Mission case, 37... Sector shaft, 47...
Regulatory equipment.

Claims (1)

[Scope of utility model registration request] A swinging arm 39 whose base end is attached to the sector shaft 37 projecting from the lower part of the mission case 13 and whose swinging end projects approximately along the direction of movement of the aircraft is provided so as to be able to swing left and right. A restrictor 47 that comes into contact with the swing arm 39 at the end position of the left and right swing and regulates its swing angle is attached to the mission case 1.
3, and the regulating device 47 is U-shaped or U-shaped with an open front end in plan view, and is held by the lower part of the transmission case 13, which is formed into left and right divisions, from both sides and the back side. Steering device for agricultural machinery.