JPH0513128Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention connects the transmission case at the front of the machine and the working device at the rear of the machine with a pipe-shaped frame.
An agricultural working machine in which a drive side bevel gear fixed to a transmission shaft horizontally suspended in the transmission case and a passive side bevel gear connected to the front end of the working device drive transmission shaft inserted through the pipe-shaped frame are interlocked. Regarding transmission structure.

[Conventional technology]

Conventionally, as shown in FIG. 5, for example, the transmission structure described above includes a drive side bevel gear 24 fixed to a transmission shaft 15 supported horizontally on a transmission case 2, and a driven side bevel gear 2 meshing with this bevel gear 24.
6 through the bearing 32 to the transmission case 2
This driven side bevel gear 26
An oil seal 33 is installed between the transmission case 2 and the transmission case 2.
The distal end spline portion 25a of the internal power transmission shaft 25 of the pipe-like frame 4 connected to the transmission case 2 is inserted into and connected to the boss spline hole 26a of the driven gear 26.

[Problem that the invention attempts to solve]

In the process of assembling the transmission structure, as shown in FIG. 6, when the pipe-shaped frame 4 is connected to the transmission case 2, the distal end spline portion 25a of the internal transmission shaft 25 is fitted into the spline hole 26a at the same time. However, because the tip of the transmission shaft 25 inside the frame 4 falls under its own weight and becomes eccentric, it is difficult to align the frame 4 to the transmission case 2 and the bevel gear 26 and the transmission shaft 25. This made it difficult to perform and took time to assemble.

The purpose of this invention is to make it possible to easily and quickly connect the pipe-shaped frames and the transmission shaft with simple modifications.

[Means for solving problems]

Therefore, in the present invention, the driven side bevel gear is supported in the transmission case via a bearing, and the spline part formed at the shaft end of the transmission shaft is fitted into the spline hole formed in the boss part of the driven side bevel gear. In addition, an oil seal is fitted between the transmission shaft and the inner surface of the frame near the rear of the spline portion.

[Effect]

According to the above configuration, the internal power transmission shaft is held approximately concentrically with the frame by support via an oil seal with respect to the pipe-shaped frame that is separated from the transmission case, and the frame is then attached to the transmission case. When you approach the specified position,
Aligning the frame to the transmission case,
Also, the transmission shaft can be easily aligned with the spline hole of the driven bevel gear supported by the transmission case with a small correction operation.

[Effect of idea]

Therefore, according to the present invention, the oil seal can be used to align the transmission shaft by simply changing the installation position of the oil seal that prevents lubricating oil from leaking from the transmission case into the pipe-shaped frame. It was possible to use it as a tool to facilitate assembly.

〔Example〕

FIG. 3 shows a schematic plan view of the entire walk-behind rice transplanter, which is an example of an agricultural machine according to the present invention, and FIG. 4 shows a side view of the entire walk-behind rice transplanter.

This rice transplanter runs on one wheel, and is equipped with an engine 1 and a transmission case 2 directly connected to the engine 1 at the front of the machine, and a seedling planting device 3 for planting two rows at the rear of the machine. , the transmission case 2 and the seedling planting device 3 are connected by a pair of left and right pipe frames 4, 4 to form a machine body,
A transmission case 5 that can be hydraulically adjusted to swing around a fulcrum P is attached to the transmission case 2, and a single propulsion wheel 6, which is pivotally supported at the rear end of the transmission case 5, is moved up and down between the left and right frames 4, 4. The propulsion wheels 6 are arranged so as to be adjustable, and the propulsion wheels 6 are grounded on the tiller G, and a pair of left and right floats 7, 7 provided at the bottom of the seedling planting device 3 are placed on the rice field T.
The machine body is supported horizontally in the front, back, left and right by floating on the ground, and the transmission case 5 is moved up and down by the hydraulic cylinder 8 according to the unevenness of the tiller G, thereby stabilizing the height and posture of the machine body with respect to the field surface T. It is configured so that it can be driven while being maintained.

The seedling planting device 3 has a pair of left and right planting claws 10 on a seedling platform 9 that supports two rows of pine-shaped seedlings A and moves back and forth horizontally with a constant stroke corresponding to the width of the pine-shaped seedlings. , 10 are driven so as to circulate in a constant trajectory S extending between the lower end of the seedling stand 9 and the rice field T, and each seedling a is cut out from the lower end of the pine-shaped seedling A and placed on the floats 7, 10. The structure is such that two rows each are planted on the rice field T leveled in step 7.

FIG. 1 shows a power transmission structure from the mission case 2 to the seedling planting device 3.

The engine 1 is directly connected to the upper end protrusion 2a of the transmission case 2, and the engine output gear 11
It supports an intermediate transmission shaft 13 equipped with two-stage gears 12a and 12b that mesh with the intermediate transmission shaft 13.

A first transmission shaft 14 is located near the intermediate transmission shaft 13.
and a second transmission shaft 15 are provided, and this first transmission shaft 14
A shift gear 16 that meshes with the small-diameter gear 12b of the two-stage gear is loosely fitted into the gear. Then, this shift gear 16 and the first transmission shaft 14 are connected to the planting clutch 17.
and are interlocked and connected via a torque limiter 18. In other words, the torque limiter 18 is connected to the drive side disk 19a that is loosely fitted to the transmission shaft 14, and the transmission shaft 1.
a passive side disk 19b spline-fitted to 4;
It consists of a transmission ball 20 that engages across both disks 19a, 19b, and a spring 21 that presses the driven side disk 19b against the drive side disk 19a, and engages the shift gear 16 with the drive side disk 19a in a pawl clutch type. By doing this, the first transmission shaft 14 is driven, and the shift gear 16 is disengaged from the drive side disk 19a by an operation from outside the case, thereby cutting off the power to the first transmission shaft 14.

Further, the first transmission shaft 14 and the second transmission shaft 15 are connected to a gear 2 having a different diameter at the end projecting outside the case.
2 and 23, and the second transmission shaft 1
Bevel gears 24, 24 provided on both left and right sides of 5,
Transmission shafts 25, 2 inserted into the frames 4, 4
The bevel gears 26 and 26 of No. 5 are engaged with each other, respectively, so that two systems of branched power transmission to the seedling planting device 3 are provided, one on the left and one on the left.

In addition, the movement space of the shift gear 16 constituting the planting clutch 17 toward the clutch disengagement side and the rotation locus of the protrusion 27 fixed at a predetermined phase in the circumferential direction of the second transmission shaft 15 are made to overlap, so that the second Transmission shaft 15
It is configured so that the transmission to the seedling planting device 3 can be interrupted to stop the planting operation only when the seedling planting device 3 is in a predetermined rotational phase (specifically, when the planting claws 10, 10 are in an upward rotational phase). There is.

The power from the transmission shaft 25 in the left frame drives the planting claw 10 on the left, and further drives the screw shaft 29 for horizontally feeding the seedling stand via the chain case 28, and also drives the transmission shaft 25 in the frame on the right side. Axis 2
The right planting claw 10 and a support shaft 31 equipped with a pair of right and left soil gathering arms 30 for gathering soil from the sides to the planted seedlings a are synchronously driven by the power from the plant 5.

In the seedling planting device transmission structure configured as described above, in the present invention, the left and right frames 4,
4 is characterized by the transmission structure to the transmission shafts 25, 25.

That is, the driven gear 26 meshing with the driving bevel gear 24 fixed to the second transmission shaft 15 horizontally suspended in the transmission case 2 is supported on the case side via the bearing 32, and the driven gear 26 is supported on the case side via the bearing 32. The front end spline portion 25a of the transmission shaft 25 is fitted and connected from the rear into the spline hole 26a formed in the boss portion, and an oil seal is provided between a portion immediately after the spline portion 25a of the transmission shaft 25 and the inner surface of the frame 4. 33 is inserted.

According to the above configuration, as shown in FIG. 2, for example, when the frame 4 is separated from the transmission case 2, the front part of the transmission shaft 25 is supported by the oil seal 33 and held substantially concentrically with the frame 4. It turns out.

Therefore, when connecting the frame 4 to the transmission case 2, the centering of the front end flange portion 4a of the frame 4 with the mounting seat on the transmission case 2 and the centering of the bevel gear 26 with the transmission shaft 25 can be smoothly performed.

[Brief explanation of the drawing]

Figure 1 is a developed plan view showing the structure of the transmission part from the rice transplanter case to the seedling planting device, Figure 2 is a longitudinal side view of the main parts in an exploded state, Figure 3 is a schematic plan view of the entire rice transplanter, and Figure 3 is a schematic plan view of the entire rice transplanter. FIG. 4 is an overall side view of the rice transplanter, FIG. 5 is a plan view of the main parts of the conventional structure, and FIG. 6 is a vertical sectional side view of the main parts of the conventional structure in an exploded state. 2...Mission case, 3...Working device, 4
... Pipe frame, 15 ... Transmission shaft, 24 ...
... Drive side bevel gear, 25 ... Frame internal transmission shaft, 25a ... Spline section, 26 ... Driven side bevel gear, 26a ... Spline hole, 32 ... Bearing, 33 ... Oil seal.

Claims (1)

[Scope of utility model registration request] A transmission case 2 at the front of the machine and a working device 3 at the rear of the machine are connected by a pipe-shaped frame 4, and a drive-side bevel gear 24 fixed to a transmission shaft 15 horizontally mounted on the transmission case 2 is connected to the pipe-shaped This is a power transmission structure for an agricultural working machine in which a driven bevel gear 26 connected to the front end of a power transmission shaft 25 for driving a working device inserted through a frame 4 is interlocked with each other. A spline hole 26 formed in the boss portion of the driven bevel gear 26
A spline portion 25a formed at the shaft end of the transmission shaft 25 is fitted and connected to the transmission shaft 25, and an oil seal 33 is fitted between the transmission shaft 25 and the inner surface of the frame 4 near the rear of the spline portion 25a. A power transmission structure for agricultural machinery characterized by the following.