JPH0542050U - Steering mechanism for mobile agricultural machinery - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a steering mechanism for a mobile agricultural machine in which a stopper that restricts a rotation range of a pitman arm when a steering operation is performed is improved so that foreign matters in a field are not entangled or pushed in a mud. A stopper arm is provided behind a sectorer shaft having a pitman arm extending forward, and a stopper arm receiving member for closing the front is provided below the mission case behind the sectorter shaft. The stopper arm is brought into contact with the stopper arm receiving member from the rear of the stopper arm so that foreign substances in the field may be caught on the stopper arm receiving member and the stopper arm, or
The stopper arm receiving member and the stopper arm prevented the mud from being pushed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a steering mechanism for a mobile agricultural machine in which a stopper device for restricting a rotation range of a pitman arm when steering is operated is improved.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, as a steering mechanism of a mobile agricultural machine, the ones shown in Japanese Utility Model Laid-Open No. 62-156582 and FIGS. 4 and 5 are known. In this conventional steering mechanism, a steering shaft A having a steering wheel attached thereto is inserted into and supported by a mission case B, and a counter shaft C and a sector shaft D are arranged in parallel with the steering shaft A in a mission case B. The steering shaft A transmits to the counter shaft C, and the counter shaft C transmits to the sector shaft D by a gear and a sector gear, respectively. The lower end of the sector shaft D projects downward from the mission case B, and the base of the pitman arm E is fixed to the projection and extends forward, and the front end of the pitman arm E has a spherical axis F, One end of the left and right drag links G, G is connected via F, and the other ends of the drag links G, G are connected to the front axles of the left and right front wheels (not shown).

A stopper engaging portion H is provided on the upper surface of the pitman arm E, and the steering shaft A is fully rotated rightward or leftward behind the pitman arm E and the sector shaft D to move the pitman arm E. A stopper I is provided which, when rotated, abuts against the stopper engaging portion H to regulate the rotation range. The stopper I has U-shaped stopper pieces Ia, Ia protruding toward the front of the machine body. The steering shaft A is inserted deep into the case B and supported by bearings, and the upper portion is supported by the shaft case J, and the lower end of the shaft case J is fixed to the case B by a plurality of bolts K. I am trying to do it.

[0004]

In the conventional steering mechanism for a mobile agricultural machine described above, the U-shaped stopper pieces Ia and Ia of the stopper I project toward the front of the machine body, and moreover, the mission case B is used. Since it is located on the lower side of the field, when the mobile agricultural machine travels in the field, foreign matter such as straw, compost, and weeds scattered in the field are caught, not only dragging the foreign matter but also the pitman arm E. There were problems that the stopper function did not work properly and that it pushed mud to disturb the levelness of the field.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a stopper arm extending behind a sector shaft having a pitman arm extending forward and closing the front below the mission case behind the sector shaft. A stopper arm receiving member is provided, and the stopper arm is brought into contact with the stopper arm receiving member from the rear thereof.

[0006]

[Action]

 According to the steering mechanism of the mobile agricultural machine of the present invention having the above-described configuration, the stopper arm is integrally extended from the pitman arm behind the sector shaft, and the stopper arm in the state where the front is closed below the mission case behind the sector shaft. Since the receiving member is provided and the stopper arm is brought into contact with the stopper arm receiving member from the rear side thereof, the stopper arm is inside the stopper arm receiving member, and the foreign matter may be caught by the stopper arm and the foreign matter may be dragged. In addition, the stopper function of the pitman arm is not hindered. Furthermore, the stopper arm does not push the mud and disturb the levelness of the field.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 3, a riding type rice transplanter (mobile agricultural machine) 1 to which the present invention is applied has a traveling vehicle body 6 in which an engine 5 is mounted on the front portion of a body frame 4 equipped with a pair of left and right front wheels 2 and rear wheels 3. is doing. A seedling planting section 8 is attached to the rear part of the traveling vehicle body 6 via a vertical link 7 composed of a parallel link and a hydraulic cylinder. A transmission case 9 is provided obliquely below and behind the engine 5 on the traveling vehicle body 6, power is transmitted from the engine 5, the gear is changed, and the four wheels of the front wheel 2 and the rear wheel 3 are driven to travel. Power is transmitted to the seedling planting portion 8 via the working portion transmission shaft 10 to perform seedling transplanting work.

Further, the traveling vehicle body 6 is provided with a steering column 11 and a steering handle 12 located above the mission case 9. Near the steering column 11 and the steering handle 12, although not shown, The main gear shift lever, the sub gear shift lever, the work unit gear shift lever, and the clutch pedal and brake pedal used when the main gear shift lever and the sub gear shift lever are turned on and off are provided. Further, in the front part of the machine body, a removable bonnet 13 covering the engine room accommodating the engine 5, a lower cover 14 arranged below the bonnet 13, and an intermediate portion between the bonnet 13 and the lower cover 14. A headlight 15, a bumper 16 and the like are installed in the vehicle. A driver's seat 17 is provided behind the steering handle 12, and an elevator lever 18 for operating the elevator link 7 is provided at a side portion of the driver's seat 17, and an adjustment lever (not shown) for adjusting the seedling planting portion 8. Etc. are provided.

In the mission case 9 shown in FIG. 1, a steering ring shaft 20 to which a steering handle 12 is attached is inserted and supported by a bearing 21, and a small diameter gear 22 is fixed to a lower end of the steering shaft 20. ing. Further, in the transmission case 9, a counter shaft 23 and a sector shaft 24 are pivotally supported on the front side in parallel with the steering shaft 20, and a gear 25 meshing with the gear 22 of the steering shaft 20 is provided on the counter shaft 23. The pinion gear 26 engraved on the counter shaft 23 is meshed with the sector gear 27 attached to the sector shaft 24.

A lower end portion of the sector shaft 24 projects downward from the mission case 9, and a pitman arm 28 is fixed to the projecting portion and extends forward. As shown in FIG. 2, one end of the left and right drag links 30, 30 is connected to the front end portion of the pitman arm 28 via spherical axes 29, 29, and the other ends of the drag links 30, 30 are connected to the left and right sides. It is connected to the front axle of the front wheel 2.

A stopper arm 31 is integrally extended rearward from a position where the pitman arm 28 is fixed to the sector shaft 24. The stopper arm 31 is provided with a stopper engaging portion 32 made of a bolt. Further, below the mission case 9 behind the sector shaft 24, there is provided a stopper arm receiving member 33 whose front is closed by a stopper plate 34 with which the stopper engaging portion 32 abuts. The stopper plate 34 has a larger vertical width than the stopper arm receiving member 33, and projects downward from the stopper arm receiving member 33, and the stopper engaging portion 32 contacts the protruding portion from the rear. In FIG. 1, reference numeral 35 is a rear-wheel drive shaft for transmitting power to the rear wheels 3 by gear shifting in the mission case 9, 36 is a PTO shaft for transmitting power to the seedling planting section 8, and 37 is a These bolts fix the steering column 11 to the mission case 9.

In the steering mechanism of the mobile agricultural machine according to the embodiment thus configured, when the riding rice transplanter (mobile agricultural machine) 1 performs seedling transplanting work, the front wheels 2 and the rear wheels 3 of the traveling vehicle body 6 are transferred. Is driven in the field to drive seedlings, and seedlings are planted by the seedling planting unit 8 which receives power from the PTO shaft 36 via the working unit transmission shaft 10. At this time, the traveling vehicle body 6 is steered by the steering handle 12 and, as shown in FIG. 2, when the steering handle 12 is fully cut to the left or right, the stopper engaging portion 32 causes the stopper plate 34 to move. To control the steering range of the front wheels 2.

Further, the stopper arm 31 and the stopper engaging portion 32 are located inside the stopper plate 34 of the stopper arm receiving member 33, and foreign matters in the field are caught by the stopper plate 34 and the stopper engaging portion 32. You won't drag. Further, the stopper function of the pitman arm 28 is not disturbed. Further, the stopper arm 31 does not push the mud to disturb the levelness of the field.

In the above conventional example, the steering shaft A is inserted deeply into the mission case B to be supported by the bearing, and the upper portion is supported by the shaft case (steering column) J, and the lower end portion of the shaft case J is supported. Since it is fixed to the case B with a plurality of bolts K, it was not easy to remove the steering shaft A from the mission case B at the time of maintenance. However, in the present invention, as is apparent from FIG. 1, when the bolt 37 is removed, the steering shaft 20 can be removed simultaneously with the steering column 11 from the transmission case 9 together with the bearing 21 and the gear 22. Maintenance can be done easily.

[0015]

[Effect of the device]

 As described above, according to the steering mechanism of the mobile agricultural machine of the present invention, the following effects can be achieved. Since the stopper arm receiving member for closing the front is arranged in the space behind the sector shaft, foreign matter in the field is not caught in the stopper arm receiving member, and the stopper arm receiving member does not push mud. Since the stopper arm is behind the stopper arm receiving member when the mobile agricultural machine is viewed from the front, foreign matters are less likely to be caught on the stopper arm. The stopper arm can have a single structure, which simplifies the structure.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an essential part of the present invention.

FIG. 2 is an operation explanatory view of a pitman arm and a stopper arm.

FIG. 3 is a side view of the entire riding type rice transplanter (mobile agricultural machine) to which the present invention is applied.

FIG. 4 is a vertical sectional side view of a conventional example.

FIG. 5 is a plan view of a conventional example.

[Explanation of symbols]

 1 Riding type rice transplanter (mobile agricultural machine) 2 Front wheel 3 Rear wheel 4 Machine frame 5 Engine 6 Traveling machine 7 Lifting link 8 Seedling planting section 9 Mission case 10 Working section transmission shaft 11 Steering column 12 Steering handle 13 Bonnet 14 Lower cover 15 Headlight 16 Bumper 17 Driving Seat 18 Lifting Lever 20 Steering Shaft 21 Bearing 22, 25 Gear 23 Counter Shaft 24 Sector Shaft 26 Pinion Gear 27 Sector Gear 28 Pitman Arm 29 Spherical Axis 30 Drag Link 31 Stopper Arm 32 Stopper Engagement 33 Stopper Arm receiving member 34 Stopper plate 35 Rear wheel drive shaft 36 PTO shaft 37 Bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Yukio Kato 667 Isuyacho, Higashi Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Inside Mitsubishi Agricultural Machinery Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A stopper arm is provided behind a sector shaft having a pitman arm extending forward, and a stopper arm receiving member for closing the front is provided below the mission case behind the sector shaft. A steering mechanism for a mobile agricultural machine, wherein a stopper arm is brought into contact with a stopper arm receiving member from the rear thereof.