JPS6129202Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a dust-proof structure for a tilling shaft bearing in a rotary working machine.

Conventionally, the dust-proof bearing structure of this type of tillage shaft has a dust-proof structure in which an annular groove is formed on the inner surface of the bearing case, and on the tillage shaft, a peripheral wall that intervenes in the groove is erected on the outer periphery of a disc. The structure was such that a plate was provided and the space between the disc and the inner surface of the bearing case was used as a dust collection space. In this way, it not only takes time and effort to process the dustproof plate on which the surrounding wall is erected, but also
Because the peripheral wall is inserted into the groove, cuttings, etc. tend to get clogged in the gap between the peripheral wall and the groove, and furthermore, the cut grass, etc. that has accumulated in the dust storage space tends to rotate together with the rotation of the disc, and the tilling axis The disadvantage was that it hindered the rotation of the

This proposal was developed in view of these shortcomings,
In addition to making it easier to process the dustproof plate, the inner surface of the bearing case is recessed to form a dust collection space to prevent cut grass from clogging the gap with the disc. It is an object of the present invention to provide a dust-proof structure that prevents the rotation of a tilling shaft from being hindered by accumulation of dust in a provided dust collection space.

The present invention will be explained below based on embodiments shown in the drawings.

A is a rotary work machine connected to the rear part of a tractor 1. A power transmission part 3 connected to the PTO shaft 2 of the tractor 1 is installed at the front part of the machine body, and a transmission main shaft 4 provided in the power transmission part 3 is connected to the main body of the machine. The main transmission shaft 4 and the tilling shaft 5 are connected to each other via a drive transmission section 6 provided on the side of the machine body. 7 is a transmission chain of the drive transmission section 6, and 8 is a chain case.

The tilling shaft 5 has a bearing 9 installed in the chain case 8.
-1, and the other end is pivotally supported by a bearing 9-2 at the tip of an engineering port arm 10 provided on the other side of the machine, and a claw seat 12 on the outer periphery for mounting a tilling claw 11 is provided. ing.

The bearing 9 is constructed by fitting a seal 13 inside an inner hole 9b of a bearing case 9a and a ball bearing 14 outside, and the tilling shaft 5 has a seal 13 at its tip.
It is fitted into the fitting holes 13' and 14' of the bearing 14 and is pivotally supported.

Reference numeral 15 denotes a dust collection space recessed in an annular shape on the inner surface 9'a of the bearing case 9a, and is recessed so that a flange 16 is projected between it and the inner hole 9b.

Reference numeral 17 denotes a dust-proof disc that constitutes a bearing dust-proof structure together with the dust storage space 15, and a seal closing plate that is fitted onto the base end 19 of the shaft support of the tilling shaft 5 and faces the inner surface of the seal 13. part 17-1 and a dust-proof plate part 17-2 intervening within the opening outer peripheral edge 15' of the dust collecting space 15 are connected to each other via a stepped part,
In addition, a dust storage space 15 is provided at the outer peripheral edge of the dustproof plate portion 17-2.
A slight gap 18 is provided between the opening outer peripheral edge 15' and the opening outer peripheral edge 15' to prevent rotational interference.

That is, the insertion shaft 21 having a larger diameter than the tilling shaft end 19 is formed with a step 20 on the tilling shaft end 19 and is connected to the tilling shaft end 19.
By fitting and welding the open end of the cylindrical tilling shaft 5, and by integrally welding the dust-proof disc 17 to the fitting shaft 21 in contact with the stepped portion 20, the disc 17 is attached to the seal 1.
3, and is positioned within the opening outer periphery 15 of the dust collecting space 15 with a slight gap 18 therebetween.

Therefore, when performing tilling work by rotating the tilling shaft 5, the bearing 9 is protected from dust by the dust-proof disc 17 that rotates together with the tilling shaft 5.
At this time, some cut grass or the like may enter through the gap 18. In this case, cut grass or the like that has entered the gap 18 will be cut by the dustproof disc 17 and fall into the dust collection space 15.
The space 15 is the bearing case 9.
Since it is formed in a concave manner, the dust will accumulate in the concave portion and will not affect the rotation of the dustproof disc 17.

The seal 1 pivotally supports the tilling shaft end 19 by rotation of the tilling shaft end 19 which rotates together with the tilling shaft 5.
3 is twisted and deformed, the coaxial end 19
Since the seal closing plate part 17-1 of the dust-proof disc 17, which is provided in contact with the stepped part 20, is in contact with the outer surface of the seal 13, deformation of the seal 13 can be corrected, and the tillage There is no room for a gap or the like to be formed between the shaft end 19 and the seal 13, and the seal 13 can reliably seal.

In addition, since the seal 13 is supported from the outside by the dust-proof disc 17, there is no need to support it from the outside with a separate member, which simplifies the support structure of the seal 13, reduces the number of parts, and reduces manufacturing work. becomes easier.

As described above, according to the present invention, the dust collecting space 15 is recessed in the bearing case 9a, and the dust-proof disc 17 is inserted into the opening outer peripheral edge 15' of the collecting space 15.
Unlike in the past, providing a peripheral wall around the outer periphery of the dust-proof disk eliminates the need for a similar structure, which makes processing easier, and also prevents cut grass, etc. from entering the gap from clogging the gap. This has the effect that cut grass and the like accumulated in the dust collecting space do not interfere with the rotation of the tilling shaft.

In addition, the sealing action of the seal is ensured, and the support structure of the seal is simplified, reducing the number of parts and facilitating manufacturing work.

[Brief explanation of the drawing]

Fig. 1 is an overall side view showing the rotary work machine according to the embodiment of the present invention, Fig. 2 is a plan view of the power transmission structure, and Fig. 3 is a plan view of the power transmission structure.
The figure is a sectional view showing the dustproof structure of the bearing. A: Rotary work machine, 5: Tilling shaft, 9: Bearing,
9a: Bearing case, 9'a: Inner surface, 15: Dust collection space, 15': Opening outer periphery, 17: Dust-proof disc, 1
8: Gap.

Claims (1)

[Scope of utility model registration request] A bearing case 9a having an annular concave dust storage space 15 formed on the inner surface 9'a is loosely fitted to the tilling shaft end 19 via a seal 13 and a bearing 14, and is stepped to the tilling shaft end 19. A fitting shaft 21 having a larger diameter than the tilling shaft end portion 19 which is connected to form the section 20 is fitted and welded to the open end of the cylindrical tilling shaft 5, and the dust-proof disc 17 is in contact with the stepped portion 20. By integrally welding the disc 17 to the fitting shaft 21, the seal 13
A dust-proof structure for a bearing of a tilling shaft in a rotary working machine, which is arranged so as to be in contact with the outer surface of the rotary working machine and to maintain a slight gap 18 within the outer peripheral edge 15' of the opening of the dust collecting space 15'1.