JPH044804A - Transmission mechanism of transplanting apparatus - Google Patents

Abstract

PURPOSE:To simplify the structure and reduce the weight of the subject mechanism by supporting the upstream side of a power-inputting transmission shaft with a rolling bearing and supporting transmission shaft with a rolling bearing and supporting the downstream side of the transmission shaft with a sliding bearing. CONSTITUTION:An input shaft 3 is supported on a plantation transmission case 2 in rolling state with a ball bearing 18. A transmission shaft 4 is supported on the plantation transmission case 2 in rolling state with the ball bearing 19 and on a planting case 7 in sliding state by directly fitting to a bearing part 14. The driving shaft 10 of a transplantation arm is supported on a bearing part 15 with a bearing and on bearing part 16 with a sliding bearing.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a transmission mechanism of a planting device in a rice transplanter.

[Conventional technology]

In the planting device, the planting arm equipped with the planting claw is ultimately driven up and down via a crank arm, etc., but since the planting arm is driven at an eccentric position with respect to the rotation axis, Back crashes in the transmission system of the planting device, such as the gear engagement part and the chain interlocking part, accumulate and affect the movement of the planting arm. In other words, at the point where the planting arm reverses its movement direction, the planting arm on the lower side of the transmission moves in advance of the input shaft on the upper side of the transmission due to back crash, resulting in unsmooth operation (shaking phenomenon). , this will have negative effects such as making the seedling planting state unstable, so try to reduce the planting arm as much as possible by installing a balancer to smooth out the drive inertia or by installing a brake mechanism that always applies a light load. I made sure it ran smoothly.

[Problem to be solved by the invention]

However, since it is necessary to separately install a dedicated brake mechanism and balancer just for this purpose, the cost seems relatively high, and there is still room for improvement.

An object of the present invention is to reduce the cost of the transmission mechanism of the planting device while maintaining a smooth driving state of the planting arm.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a rolling shaft support structure for the upper shaft support of the plurality of shaft supports provided in the transmission system from the input shaft to the planting arm, and a rolling shaft support structure for the lower transmission shaft. The shaft support is constructed with a sliding shaft support structure.

[For production]

In the past, all shaft supports in the transmission system from the input shaft to the planting arm were of a rolling shaft support structure via bearings, and the durability of these shaft supports was set with a relatively high margin. It had been. Therefore, by focusing on this point, we adopted the above-mentioned characteristic configuration by recognizing that it is possible to change the shaft support of the transmission system of the planting device to a sliding shaft support structure.

In other words, the shaft support on the lower side of the transmission, where the planting arm that requires smooth movement is located, is set to a sliding shaft support structure, and the shaft support on the upper side of the transmission, which is the power input side, is set to a rolling shaft support structure. By creating a difference in the state in which the rotational resistance acting on the rotational shaft on the lower side is greater than the rotational resistance acting on the rotational shaft on the upper side of the transmission, the rotational shaft on the lower side of the transmission is always driven. This makes it possible to prevent the aforementioned planting arm from being driven unsmoothly as much as possible.

Further, according to the above configuration, it is sufficient to simply change the conventional rolling shaft support structure using bearings to a sliding shaft support structure that is low in cost, so it is possible to reduce costs while providing the necessary functions.

〔Effect of the invention〕

Therefore, by rationalizing the transmission structure of the planting device by reviewing it, we were able to reduce costs without compromising the necessary functions, and at the same time, we were able to simplify the structure and reduce weight by reducing the rolling shaft support structure. We were able to provide the transmission mechanism for the device.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figure 2 shows the power of the engine (E) installed at the front of the aircraft.
A walk-behind rice transplanter is shown in which input is sent to a planting mission case (2) at the rear of the machine via a mission case (M) and a transmission 'y-s<c). , FIG. 1 shows the transmission structure of the planting device in the walk-behind rice transplanter.

Power from the engine (E) passes through the bevel gear mechanism (1) and the planting flange (A) to the planting mission case (
2) is input to the input shaft (3) as the planting arm drive shaft for the two central rows that pass through the horizontal frame, and the chain interlocking mechanism (5) is connected between the input shaft (3) and the transmission shaft (4). In addition to the construction, a support rod (6
), (6) is extended to the left and right from the planting mission case (2), and a planting case (7) is attached to each of the left and right ends.
(7) is a preparation.

An intermediate shaft (8) is also interlocked with the chain interlocking mechanism (5), and the transverse feed mechanism (9) of the seedling stand (17) is driven through the intermediate shaft (8).

The planting case (7) is equipped with a planting arm drive shaft (10) linked to the transmission shaft (4) by a chain, and the protruding ends of these planting arm drive shafts (10), (10) and a crank mechanism (1) that drives a planting arm (12) provided with a planting claw (11) at the left and right protruding ends of the input shaft (3).
3) are interlocked to form a four-row planting device.

As shown in the figure, the input shaft (3) is rotatably supported by the planting mission case (2) via a ball bearing (18), and the transmission shaft (4) is supported by the planting mission case (2). For the planting case (7) at both ends, it can be used as a sliding shaft support by directly fitting into the shaft support (14) of the case (7). be.

Regarding the planting arm drive shaft (1o), the shaft support (15) on the side where the planting arm drive mechanism (13) is present is supported by a bearing in consideration of durability, and the shaft support (16) on the opposite side is supported by bearings.
) is configured to have a sliding shaft support structure that is directly fitted into the case (7) to generate an appropriate amount of rotational resistance.

[Another example]

The transmission shaft (4) and the planting arm drive shaft (1) in this example
The sliding shaft support of 0) may be a sliding shaft support structure with a bearing bush interposed therebetween.

The present invention may also be applied to a transmission mechanism of a planting device of a riding rice transplanter.

Incidentally, although reference numerals are written in the claims section for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the transmission mechanism of the planting device according to the present invention, FIG. 1 is a sectional plan view showing the mechanism, and FIG. 2 is a side view of the walking rice transplanter. (3)... Input shaft, (12)... Planting arm.

Claims (1)

[Claims] Of the multiple shaft supports provided in the transmission system from the input shaft (3) to the planting arm (12), the shaft support on the upper side of the transmission has a rolling support structure, and the shaft support on the lower side of the transmission has a sliding structure. A transmission mechanism for a planting device characterized by having a shaft support structure.