JPS6023572Y2 - Transmission shaft support structure - Google Patents

Description

[Detailed description of the invention] The invention is applicable to transmission between, for example, a fixed transmission case and a steering wheel drive transmission case in a riding rice transplanter, or between a transmission case and an auxiliary chain case in a walk-behind tiller. In terms of structure, the present invention relates to a transmission shaft support structure in which the transmission shaft is supported via a bearing fitting between a transmission case and another case attached to the side surface of the transmission case.

Conventionally, in this type of shaft support structure for a transmission shaft, the transmission shaft between the transmission case and another case was supported via two bearings held at both ends of the other case in the axial direction. However, in this case, the distance from the bearing fitting on the other case side of the transmission shaft to the shaft end inside the transmission case becomes long, so at least one bearing fitting must be provided on the transmission case side. Coupled with the fact that both bearing portions of the separate cases protrude outward in the direction of the transmission shaft axis, there is a problem in that the shaft support structure tends to be complicated and large.

Therefore, in order to avoid complicating and increasing the size of the shaft support structure, the transmission shaft that spans between the transmission case and another case attached to the side of the transmission case is connected to one transmission shaft held in each of the two cases. There is a shaft support structure for a transmission shaft that is supported via a bearing (for example, Japanese Utility Model Application No. 52-139978).

However, even with such a shaft support structure, in order to fix the bearing in a predetermined position, it is necessary to separately provide a retainer for the bearing.

In view of these circumstances, the present invention has been developed through simple structural improvements.
The purpose is to securely fix the bearing on the transmission case side, thereby further simplifying and compacting the shaft support structure.

That is, the transmission shaft support structure according to the present invention supports the transmission shaft extending between the transmission case and another case attached to the side surface of the transmission case through one bearing member held in each of the two cases. A shaft support structure for a transmission shaft that is supported by the other case, the end surface of which is in contact with a bearing tool held in the transmission case and serves as a retaining member for the bearing tool. , since the cylindrical portion that fits into the through hole for holding the bearing tool formed in the side wall of the transmission case is integrally provided, the bearing tool on the side of the transmission case is not attached as in the conventional case. The bearing fitting can be securely fixed without separately providing a stopper, and the bearing structure can be further simplified and made more compact.

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

Figures 1 and 2 show a rear-mounted riding rice transplanter, which has an engine 1 mounted on its front end, a frame 2, and a gear case through which a drive shaft 3 connected to the engine 1 passes through in the front-rear direction. 4 and a reduction case 5 that receives power from the gear case 4 are provided at appropriate intervals in the front and rear direction,
A first transmission case 8 and a plate-shaped support member 9, which support the axle 7 of one steering wheel 6 running in the center in the width direction of the aircraft, are attached to the gear case 4 so as to be rotatable around the vertical axis. , the deceleration case 5 includes a pair of left and right rear wheels 10.
A second transmission case 11°11 for driving 10 is attached.

In addition, a steering bundle 12 for the steering wheel 6 and a driver's seat 13 are disposed at the front and rear center portions of the frame 2 and at the top of the deceleration case 5. For planting seedlings taken out from the mounting table 14, the unit 1 is used for planting 4-row seedlings in sequence.
5 are connected so that they can be raised and lowered.

FIG. 3 shows the transmission and support structure of the steering wheel 6, which is constructed as follows.

That is, an input vertical shaft 17 having a bevel gear 16B interlocking with the bevel gear 16A of the drive shaft 3 is supported in a cylindrical case portion 4A along the vertical direction of the gear case 4 via two bearings 18.18. At the same time, a third transmission case 19, in which the first transmission case 8 and the plate-shaped support member 9 are bolted, is fitted into the cylindrical case portion 4A so as to be rotatable around the axis of the input vertical shaft 17. The gear case 4 and the third transmission case 19 are supported together, and the gear case 4 and the third transmission case 19
and a large-diameter relative rotation surface A that contacts each other from the vertical axis direction, and a relative rotation surface B that contacts each other from the radial direction.
and is formed.

Further, a horizontal transmission shaft 21 having a bevel gear 20B interlockingly interlocks with a bevel gear 20A attached to the input vertical shaft 17 extends between the third transmission case 19 and the first transmission case 8.
is supported by each of these two cases 19.8 through one bearing 22, 23 held therein, and the first transmission case 8 has an end surface that is connected to the bearing fitting 2.
3 and serves as a retaining member for the bearing 23 to prevent the bearing 23 from being removed. A cylindrical portion 8A that prevents ejection is integrally provided.

Further, the input vertical shaft 17 is extended below the horizontal transmission shaft 21, and its extended shaft portion 17A is supported on the bottom wall 19B of the third transmission case 19 via a bearing 25, and the first In the transmission case 8, the transmission chain 28 is wound around the sprocket 26 attached to the horizontal transmission shaft 21 and the sprocket 27 attached to the axle 7,
Therefore, the drive shaft 3, the input vertical shaft 17, the horizontal transmission shaft 2
1. It is configured to transmit power to the axle 7 of the steering wheel 6 via the transmission chain 28.

[Brief explanation of drawings]

The drawings show an example of the shaft support structure of the transmission shaft according to the present invention,
FIG. 1 is a schematic side view of the riding rice transplanter, FIG. 2 is a schematic plan view, and FIG. 3 is a developed sectional view of the main parts. 8...Separate case, 8A...Cylinder part, 1
9...Transmission case, 19A...Side wall,
21...Transmission shaft, 22.23...Bearing tool, 24...Through hole.

Claims (1)

[Scope of utility model registration request] A transmission shaft 21 extending between the transmission case 19 and another case 8 attached to the side surface of the transmission case 19 is connected to the two cases 19,
A transmission shaft support structure in which the transmission shaft is supported through one bearing 22 and 23 held by each of the transmission shafts 8 and 8, the end surface of which is supported by the transmission case 19 in the another case 8. A cylindrical portion 8A that fits into a through hole 24 for holding the bearing 23 formed in the side wall 19A of the transmission case 19 so as to come into contact with the held bearing 23 and serve as a retaining member for the bearing 23. A shaft support structure for a power transmission shaft, characterized in that it is integrally provided with a protruding structure.