JPH0446485Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a support device for a rotary shaft provided in a rotary tiller.

[Prior art]

The conventional rotary shaft provided in this type of rotary tiller is shown in FIGS. 4 and 5 as conventional examples.
It is supported as shown in the figure.

That is, the one shown in FIG. 4 includes a chain case 10 formed of sheet metal, a bearing holder 21 that supports a bearing 20, and a winding prevention 22.
A holder part 23 of a forged product integrally formed with
is fixed by welding, and this holder part 2
The rotary shaft 11 is rotatably supported by a bearing 20 supported by the rotary shaft 11 .
Further, in the one shown in FIG. 5, a cast product bearing holder 21 that supports the bearing 20 and a cast product wrapping prevention part 22 are constructed separately, and these separate bearing holder 21 and wrap prevention part 22 are constructed separately.
Thus, the chain case 10 is clamped and fixed from the front and back through the mounting bolts 24, and the rotary shaft 11 is rotatably supported by the bearing 20 supported by the bearing holder 21.

However, since the cast bearing holder 21 shown in FIG. 5 requires space for mounting with mounting bolts, the overall shape becomes large and the plate thickness of the chain case 10 is thick to maintain strength. The disadvantage is that it is heavier. Also, in the case of the cast bearing holder 23 shown in FIG. 4, since the bearing holder 23 is supported only by the chain case 10 made of sheet metal, the plate thickness of the chain case 10 must be increased, which increases the overall weight. There is a drawback.

In addition, since the distance K between the tilling claws 16 and the inside of the chain case 10 cannot be widened, the center of the bearing 20 is unevenly distributed by a distance H from the outside of the chain case 10. Since torsional force acts on the chain case 10, this example also has the disadvantage that the thickness of the chain case 10 made of sheet metal cannot be reduced.

[Purpose of invention]

The present invention was devised in view of the above-mentioned conventional circumstances and to eliminate these drawbacks.By fixing and supporting the bearing holder on the edges of both the support holes of the chain case and the anti-wrapping plate, It is an object of the present invention to provide a rotary shaft support device for a rotary tiller that has a strong structure and is lightweight.

[Structure of the idea]

A rotary shaft support device for a rotary tiller according to the present invention that achieves the above object has a cylindrical bearing holder that supports the bearing of the rotary shaft.
A long distance is formed by the support hole edge formed inwardly protruding from the side of the chain case and the support hole edge formed outwardly protruding from the side of the winding prevention plate integrally fixed to the chain case side. It is characterized in that it is fixedly supported.

〔Example〕

Hereinafter, the drawings showing the present invention as an embodiment will be explained.

As shown in FIG. 2, 1 is a tractor main body, and a side drive type rotary tiller 2 is connected to the rear of the tractor main body. In this side drive type rotary tiller 2, as shown in FIG. A rotary shaft 11 rotatably supported on a chain case 10 is rotated through a bevel gear 5, a tribe shaft 6, a sprocket 7, a chain 8, and a sprocket 9.

Further, a concentric rotary shaft 13 is freely rotatably supported on a bearing frame 12 which is disposed facing the chain case 10 with a predetermined plowing width. A rotary pipe 15, which has mounting plates 14, 14 fixed to both ends thereof, is connected and fixed on the same axis with mounting bolts, etc., and this rotary pipe 15 has a large number of tilling claws 16. installed.

As shown in FIG. 1, the chain case 10 has a curved support hole edge 31 that protrudes from the chain case side surface 10a toward the inside of the chain case 10, and a winding that is integrally fixed to the chain case side surface 10a. The support hole edge 33 protruding outward from the side surface (10a) of the attachment prevention plate 32 is curved, and the cylindrical bearing holder 30 provided to support the bearing 20 of the rotary shaft 11 The outer diameter is the support hole edge 31 of the chain case 10 and the support hole edge 33 of the wrapping prevention plate 32.
Therefore, the center of the bearing 20, which is fixed at a long distance L that substantially matches the width of the bearing 20 and supported by this bearing holder 30, substantially matches the chain case side surface 10a, and the eccentric load is not applied to the bearing 20. It seems like it doesn't work anymore.

The cylindrical bearing holder 30 also has an oil seal 34 adjacent to the outside of the bearing 20.
is supported, and one end is supported by a bearing 20.
The other end of the rotary shaft 11 is supported by a bearing 36 of the support in a bearing support hole 35 formed in the outer case 10b of the chain case 10.
It is prevented from coming off by a C-shaped pin 37 installed opposite to the inner ring of the bearing 20, and this C-shaped pin 37 is
Its outer diameter is regulated by the hole provided in the sprocket 9 and is fixed so that it does not open, so as in the conventional case shown in FIGS. 4 and 5,
A screw carved into the rotary shaft 11 for the sprocket 9 and a nut 26 (with anti-rotation) that is screwed into this screw.
Rotary shaft 11 without firmly tightening and fixing it.
The extending end inside the case can be supported by a bearing 36. Therefore, by supporting the rotary shaft 11 on both sides of the sprocket 9 by the bearings 20 and 36, the shaft diameters of the bearings and the rotary shaft 11 itself can be made smaller than those of conventional rotary shafts. The support structure for the rotary shaft 11 can be made more compact.

The bearing holder 30 that supports the bearing 20 of the rotary shaft 11 has a long length formed by the support hole edge 31 of the chain case 10 and the support hole edge 33 of the winding prevention plate 32 fixed to the chain case side surface 10a. The plate thickness of the chain case 10 made of sheet metal is made thinner so that it is firmly fixed at a distance L and can bear the load applied to the bearing 20 over a long span, and also prevents excessive twisting force from being applied to the chain case 10. It is possible to reduce weight,
Furthermore, the bearing holder 30 itself does not need to be manufactured from a cast or forged product as in the past.
Since it is only necessary to cut the pipe material, processing is easy and material can be used without wasting it.

[Effect of idea]

In short, the rotary shaft support device for a rotary tiller according to the present invention has a cylindrical bearing holder that supports the bearing of the rotary shaft, and a support hole edge formed protruding inward from the side surface of a chain case, Since the bearing holder is fixedly supported at a long distance from the support hole edge formed outwardly from the side surface of the anti-wrapping plate integrally fixed to the side surface, the bearing holder is secured to the support hole edge of the chain case. The chain case can be firmly supported over a long distance by the support hole edge of the winding prevention plate fixed to the chain case, and the chain case can be made thinner and lighter. Furthermore, since the bearing holder itself only requires cutting the pipe material, machining is easy and materials can be used without waste.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Fig. 1 is a side longitudinal sectional view of the main parts, Fig. 2 is a side view of the tractor, Fig. 3 is a front longitudinal sectional view of the rotary tiller, and Fig. 4 is a side longitudinal sectional view of the main parts showing a conventional example.
FIG. 5 is a side vertical cross-sectional view of the main parts of another conventional example. 2...Rotary plowing part, 10...Chain case, 10a...Chain case side surface, 11...Rotary shaft, 20...Bearing, 30...Bearing holder, 31, 33...Support hole edge, 32...
...Anti-wrapping plate, L...distance.

Claims (1)

[Claims for Utility Model Registration] 1. A cylindrical bearing holder that supports the rotary shaft bearing is formed by a supporting hole edge formed inwardly protruding from the side surface of the chain case, and a winding integrally fixed to the side surface of the chain case. A rotary shaft support device for a rotary tiller, characterized in that a rotary shaft support device for a rotary tiller is fixedly supported at a long distance by a support hole edge formed outwardly protruding from a side surface of a sticking prevention plate. 2. The rotary shaft support device for a rotary tiller according to item 1 of the utility model registration claim, in which the center of the bearing supported by the bearing holder is substantially aligned with the side surface of the chain case.