JP2566038B2 - Transmission mechanism of planting device - Google Patents

Description

The present invention relates to a power transmission mechanism of a planting device in a rice transplanter.

[Conventional technology]

In the planting device, finally, the planting arm equipped with the planting claw is vertically moved via a crank arm or the like.
Since the planting arm is driven at an eccentric position with respect to the rotation axis, backlash of the transmission system in the planting device such as the gear interlocking part and the chain interlocking part accumulates and affects the movement of the planting arm. It was supposed to give. In other words, at the point where the planting arm reverses its direction of movement, backlash causes transmission, and the planting arm on the lower hand side moves forward with respect to the input shaft on the upper hand side of the transmission. Since the seedling planting condition may become unstable, a balancer may be attached to smooth the driving inertial force, or a brake mechanism that constantly applies a light load may be installed to maximize the planting arm. I was trying to drive smoothly.

[Problems to be Solved by the Invention]

However, it is necessary to additionally install a dedicated brake mechanism and balancer only for that purpose, so there is a sense of cost increase, and there is 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 for solving the problem]

In order to achieve the above-mentioned object, the present invention provides a rolling shaft support structure of a shaft support part on a transmission upper side among a plurality of shaft support parts provided in a transmission system from an input shaft to a planting arm, and a transmission lower side. The shaft support portion of is configured to have a sliding shaft support structure.

[Work]

In the past, all the shaft support parts in the transmission system from the input shaft to the planting arm had a rolling shaft support structure via bearings, so the durability of these shaft support parts should be set with a relatively large margin. It had been. Therefore, the above characteristic configuration is adopted by paying attention to that point, that is, by recognizing that the shaft support of the transmission system of the planting device can be changed to a sliding shaft support structure.

In other words, the shaft support on the lower transmission side where the planted arm that requires smooth movement exists is set to the sliding shaft support structure, and the shaft support on the upper transmission side, which is the power input side, has a rolling support structure. By attaching the left to the state that the rotational resistance acting on the lower rotating shaft becomes larger than the rotating resistance acting on the transmission upper rotating shaft, the transmitting lower rotating shaft is always driven and driven. As a result, it is possible to prevent the aforementioned planting arm from being driven unsatisfactorily as much as possible.

Further, according to the above structure, the rolling bearing structure using the conventional bearings only needs to be changed to the sliding bearing structure which is inexpensive, so that the cost can be reduced while providing the necessary functions.

〔The invention's effect〕

Therefore, by reviewing the transmission structure of the planting device and rationalizing it, cost reduction was achieved without impairing necessary functions, and simplification and weight reduction of the structure by reducing the rolling bearing structure were achieved at the same time. The transmission mechanism of the device could be provided.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a walk-behind type in which the power of the engine (E) mounted on the entire body is input to the planted mission case (2) at the rear of the body via the mission case (M) and the transmission case (C). Rice transplanters are shown.

FIG. 1 shows the transmission structure of the planting device in the walk-type rice transplanter.

The power from the engine (E) laterally penetrates through the bevel gear mechanism (1) and the planting clutch (A) into the planting mission case (2), and the input shaft (3 as a planting arm drive shaft for the central two rows). ) And its input axis (3)
A chain interlocking mechanism (5) is erected between the transmission shaft (4) and the transmission shaft (4), and the support rods (6) and (6) in which the transmission shaft (4) is installed are left and right from the planted mission case (2). Extending and planting case (7) on each of the left and right ends,
(7) is provided.

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

The planting case (7) is provided with a planting arm drive shaft (10) chain-linked to the transmission shaft (4), and the projecting end portions of the planting arm drive shafts (10) and (10). And a crank mechanism (13) for driving a planting arm (12) having a planting claw (11) at the left and right protruding ends of the input shaft (3) are interlockingly connected to form a four-row planting device. I am doing it.

The present invention is applied to the left and right planting arms (12) and (12) of the four planting arms (12) described above, and the structure thereof will be described next. The present invention is not applied to the two centered planting arms (12) and (12) because the input shaft (3) directly serves as the planting arm drive shaft.

As shown in FIG. 1, the input shaft (3) is rollingly supported by the planted mission case (2) via a ball bearing (18), and the transmission shaft (4) is planted mission case (2). Is supported by rolling bearings via ball bearings (19), and the case (7) at both ends is directly fitted to the shaft support (14) of the case (7) to form a sliding shaft support. is there. The planted arm drive shaft (10) has a shaft support (1
Bearing 5 is a bearing support considering durability, and the opposite side shaft support (16) is directly fitted to the case (7) to form a sliding shaft support structure so that appropriate rotation resistance is generated. I am doing it.

That is, the plurality of shaft support parts (14), (16), (19) provided in the transmission system to the planting arms (12), (12) at the left and right ends.
Of these, the shaft support (19) of the power transmission shaft (4) near the input shaft (3) on the power transmission side has a rolling shaft support structure, and the shaft support of the power transmission shaft (4) on the power transmission lower side. (14) and the shaft supporting part (16) of the planted arm drive shaft (10) are respectively configured in a sliding shaft supporting structure.

[Another embodiment]

The sliding shaft support portions (14) and (16) of the transmission shaft (4) and the planted arm drive shaft (10) in the present embodiment may have a sliding shaft support structure with a bearing bush interposed.

Further, the present invention may be applied to a transmission mechanism of a planting device of a riding type rice transplanter.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a transmission mechanism of a planting device according to the present invention, FIG. 1 is a cross-sectional plan view showing the mechanism, and FIG. 2 is a side view of a walking type rice transplanter. (3) …… Input shaft, (12) …… Planted arm, (14),
(16), (19) …… Axial support.

Claims (1)

(57) [Claims] 1. A plurality of shaft support parts (14), (16), (19) provided in a transmission system from the input shaft (3) to the planting arm (12).
Among these, the plant is characterized in that the shaft support part (19) on the transmission upper hand side has a rolling shaft support structure and the shaft support parts (14), (16) on the lower transmission side have a sliding shaft support structure. Transmission mechanism of the attached device.