JPS6342483B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the body structure of a rice transplanter, and particularly to one in which the frame of the machine includes a transmission case forming a power transmission system to a planting section.

In response to the need to reduce the weight of rice transplanters, especially walking-type rice transplanters, in recent years, a power transmission system to the planting section equipped with a seedling stand, etc. has been used, in other words, the transmission case has been integrated into the machine frame. Efforts are being made to reduce the number of component parts by using them as parts.

By the way, the fuselage frame needs to support the seedling platform that moves left and right with the planted seedlings in a well-balanced manner, and also firmly fix the steering handle pipe, so a part of the fuselage frame is attached to the transmission case. When configuring the structure, it is necessary to keep this point in mind and ensure sufficient strength especially against torsion in the left and right direction.

The present invention has been made in view of the above circumstances, and it is possible to improve the strength against torsion in the left and right directions of the machine, thereby supporting a planting section such as a seedling stand in a well-balanced manner, and also to reduce the number of parts, thereby reducing the weight of the machine. The purpose of this study is to provide a rice transplanter body structure that can achieve this goal.

For this purpose, the present invention branches the transmission case extending toward the planting area side to the left and right, and connects the branched transmission cases to the left and right via a float attachment member, thereby creating a framework structure in plan view. It is characterized by having a body frame.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be specifically described below based on an embodiment shown in the drawings.

The walk-behind rice transplanter, indicated by reference numeral 1 in FIGS. 1 and 2, is equipped with an engine 2 as a driving source and a transmission case 3 integrally connected to the engine 2 at the front, and left and right handle pipes 4 at the rear. 4 and a seedling stand 5 arranged immediately in front of the planting section 6. The main transmission case 7 that extends to the rice transplanter 1 constitutes the front part of the body frame of the rice transplanter 1.

The left and right running wheels 8, 8 are the transmission case 3
a transmission chain case 9 rotatably supported by
It is pivotally supported at the tip of the transmission case 9 and is arranged on both sides of the main transmission case 7, and is rotationally driven by power transmitted from the engine 2 through the transmission in the transmission case 3. The transmission chain cases 9, 9 have a link mechanism 1 connected to a hydraulic cylinder device 10 driven by the power of the engine 2.
1, the hydraulic cylinder device 1
It is designed to swing up and down or to be held at an arbitrary swinging position by the 0 expansion/contraction control. Furthermore, floats 12 are provided on both sides of the left and right running wheels 8, 8.
12 is arranged, and the front part of the floats 12, 12 is connected to the transmission case 3 via the link arm 13.
It is attached to the top and can be moved up and down by a predetermined amount.

Here, an intermediate portion of a horizontal transmission case 14 is connected to the rear end of the main transmission case 7, and a pair of branch transmission cases 15 are provided at left and right end portions of the horizontal transmission case 14 and extend rearward in parallel to each other. are arranged in series, and a lead cam shaft 16 is pivotally supported between the rear end portions of the branch transmission case 15 facing the rear side of the seedling platform 5. Furthermore, the four planting rods 17 arranged on the front side of the seedling platform 5 are rotatably supported by the left and right branch transmission cases 15, 15, respectively, through support shafts 18. . In order to rotationally drive these support shafts 18, 18 and lead cam shaft 16, the power transmission system described below includes a main transmission case 7, a lateral transmission case 14, and a branch transmission case 1.
5, 15. That is, the front end of the propeller shaft 19 rotatably supported within the main transmission case 7 is connected to an output rotating shaft (not shown) taken out from the transmission case 3, and is connected laterally to the rear end of the propeller shaft 19. A horizontal transmission shaft 20 rotatably supported within the transmission case 14
A bevel gear mechanism 21 is interposed between the
The rotational output of the engine 2 is decelerated to a predetermined speed to rotationally drive the transverse transmission shaft 20. Furthermore, both ends of the horizontal transmission shaft 20 and the left and right support shafts 18,1
8, there are chain transmission mechanisms 22, 2, respectively.
2 is provided, and the power transmitted to the transverse transmission shaft 20 is branched to the left and right to drive the support shafts 18, 18 to rotate at a constant speed. Further, the lead cam shaft 16 has its end connected to one of the support shafts 18 via another chain transmission mechanism 23, and the planting rod 1
It is configured to be rotated in one direction in conjunction with the drive of the drive unit 7. The lead metal 24 that is fitted onto the lead cam shaft 16 is connected to the rear side of the seedling stand and is prevented from rotating.
The seedling platform 5 can be reciprocated from side to side by rotating the seedling table 6 in one direction.

In addition, mounting brackets 25, 25 are attached to the left and right floats 12, 12 near the lower end of the seedling platform 5.
The left and right floats 12, 12 are connected to each other by a float mounting pipe 26 which is pivotally connected at both ends to the mounting brackets 25, 25 and extends laterally.

Here, the float mounting pipe 26 rises from the mounting brackets 25, 25 and extends its horizontal portion 27 to the left and right branch transmission cases 15, 1.
5, to which the base ends of the left and right handle pipes 4, 4 are welded and fixed via connection brackets 28, 28.

Therefore, the horizontal part 27 of the float mounting pipe 26 connects the left and right branch transmission cases 15, 15 to the left and right by fixing the connecting brackets 28, 28 to the rear ends of the branch transmission cases 15, 15 with bolts. The rear fuselage frame 2 constitutes the fuselage frame of the visual framework structure, and is configured in this way.
A seedling mounting table 5 is supported on the seedling table 9 via a guide rail 30 so as to be movable laterally.

With this configuration, when the lead cam shaft 16 is rotationally driven by the engine 2, the seedling platform 5 is reciprocated left and right along the guide rail 30, and the planting rod is driven in conjunction with this movement. 17
Due to this action, the seedlings for planting on the seedling platform 5 are planted in the field. At this time, the seedling platform 5 has a considerable weight on which the seedlings for planting are placed, and in the process of horizontally moving the seedling platform 5, the lateral weight balance of the machine body is lost.
By the way, since the seedling platform 5 is supported on the cantilever-shaped left and right branch transmission cases 15, 15 via the guide rail 30, the left and right branch transmission cases 15, 15 are bent by the weight of the seedling platform. A bending moment is generated at each base end. Since these bending moments differ in magnitude depending on the left and right lateral movement positions of the seedling platform 5, they apply torsional force to the lateral transmission case 14 and furthermore to the main transmission case 7. . However, according to the present invention, the left and right branch transmission cases 15, 1
The rear end of 5 is connected to the left and right through a float mounting pipe 26, and this float mounting pipe 2
6 has a cross-sectional shape with relatively high bending rigidity, so the amount of deflection of the left and right branch transmission cases 15, 15 is averaged to reduce the difference in deflection therebetween. Therefore, even if the seedling platform 5 is at the end position of the lateral movement stroke and the left-right weight balance of the machine body is greatly disturbed, a large torsional force is not applied to the lateral transmission case 14 and the main transmission case 7, so that the seedling platform 5 can be supported in a well-balanced manner without tilting in the left-right direction. This eliminates the inconvenience of varying planting depth during planting.

Further, the steering handle pipes 4, 4 are fixed to the rear fuselage frame 29 configured as a framework as described above, and the left and right handle pipes 4,
Since the fuselage frame does not twist in the left-right direction due to the difference in the forces applied to the steering wheel, reliable steering operations can be performed.

As explained above, according to the present invention, the fuselage frame supporting the planting section is formed into a strong frame structure in plan view using the transmission case and the float mounting member, so the steering handle or There is no need for special reinforcing members to support the planting section such as a seedling stand, and the number of parts can be reduced to reduce the weight of the machine body. In particular, the fuselage frame has a float mounting member that is passed in the left and right directions, so it has strong resistance to torsional forces in the left and right directions. It provides well-balanced support to prevent fluctuations in planting depth, and also ensures that the operating force of the steering handle is transmitted to the aircraft body.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic side view showing an embodiment of a rice transplanter to which the present invention is applied, and FIG. 2 is a partially sectional plan view of the same. 1...Walking rice transplanter, 2...Engine, 3...
Mission case, 4...Handle pipe, 5...
... Seedling stand, 6... Planting section, 7... Main transmission case, 8... Running wheels, 12... Float, 14...
... Lateral transmission case, 15 ... Branch transmission case, 16
... Lead cam shaft, 26 ... Float mounting pipe, 27 ... Horizontal section, 28 ... Connection bracket,
29... Rear fuselage frame.

Claims (1)

[Claims] 1. A transmission case extending toward the planting section side equipped with a seedling stand etc. is branched to the left and right, and these branched transmission cases are connected to the left and right via a float attachment member to form a machine with a frame structure in plan view. A body structure of a rice transplanter characterized by forming a frame and supporting a planting part with this body frame.