JPS5854881Y2 - Flexible seal device on inclined claw shaft - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a system between the outer end of an inclined cylindrical shaft rotatably supported around an axis slightly inclined with respect to the axis of the tilling shaft and the tilling shaft. The present invention relates to a flexible seal device configured.

As shown in FIG. 3, a conventional flexible sealing device for an inclined claw shaft has a seal between a boss portion 20A of a rotary transmission gear 20 attached to a tilling shaft 01 via a key and an outer end of an inclined cylindrical shaft 02. An elastic lip 21A having a 3-shaped cross section elastically contacts the outer circumferential surface of the boss portion 20A and the inner circumferential surface of the inclined cylinder shaft 02.
However, a sealing member 21 having
In this case, normally the eccentric rotation of the inclined cylinder shaft 02 is absorbed by the bending deformation of the elastic lip 21A, and the desired sealing function can be exerted. Claw shaft 22 and seal member 21
Once soil, grass, etc. enters from between the reinforcing iron core 21B, the grass, etc. gets stuck in the recess of the elastic lip 21A, and the intended bending deformation of the seal member 21 is inhibited. As this progresses and the grass etc. hardens due to intrusion, the deterioration of the deflection of the sealing member is significantly accelerated, and as a result, stress due to eccentric rotation of the inclined cylinder shaft 02 is locally repeatedly applied to the elastic lip 21A. As a result, the sealing member 21 is easily damaged in a short period of time, resulting in an inconvenience such as oil leakage.

The present invention solves the above-mentioned disadvantages by simply modifying the sealing mechanism, and enables good sealing function to be exhibited over a long period of time. - A solid elastic O-ring is interposed between the outer end of the inclined cylindrical shaft rotatably supported around the inclined axis and the tilling shaft, and on the outside of this O-ring, The present invention is characterized in that it is provided with a retainer that is fixedly supported by the tilling shaft or the oblique cylinder shaft and presses the elastic O-ring 3 in the insertion direction.

That is, by interposing a solid elastic O-ring between the tilling shaft and the outer end of the inclined cylinder shaft, grass, etc. can get stuck in the recess of the elastic lip, unlike the conventional sealing device mentioned above. Moreover, even if there is soil on the surface of this O-ring,
Even if grass is attached, the attached soil, grass, etc. can be easily collapsed by the deflection deformation of the O-ring due to the eccentric rotation of the inclined cylinder shaft, and the desired deflection deformation of the O-ring can be maintained for a long period of time. It can be held securely and well throughout.

In addition, the elastic O-ring that is in contact with both the tilling shaft and the outer end of the inclined cylinder shaft is more strongly pressed against the shafts by the retainer that presses the elastic O-ring in the insertion direction. and improves its sealing performance.
Even if some wobbling occurs between the two shafts, it can be absorbed satisfactorily.

Therefore, by simply improving the sealing mechanism interposed between the tilling shaft and the outer end of the inclined cylinder shaft, damage to the sealing member due to adhesion of soil, grass, etc. can be suppressed, and the system can be used for a long period of time. This made it possible to reliably exhibit good sealing function.

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

FIG. 1 shows a support part of the rotary case 6 that rotatably supports the tilling shaft 1, and a cylindrical member 7 fitted onto the base end portion 1a of the tilling shaft 1 protruding from the lower end of the rotary case 6. 6A via bolts etc., and this fixed cylindrical member 7
A bracket 9 is attached to the slanted outer circumferential surface of the rotary case 6 to attach the remaining tillage processing claw 8 capable of tilling the remaining tillage area under the rotary case 6 to the outer periphery of the slanted cylindrical shaft 2. A key 11 is rotatably supported via a bearing 10 around an axis slightly inclined with respect to a, and a key 11 is attached to the outer end of the fixed cylindrical member 7 of the tilling shaft 1 and the tilling shaft 1. A rotation transmission gear 14 that meshes with a gear 13 formed on the inner circumferential surface of the outer end of the inclined cylindrical shaft 2 is attached to the spline shaft portion located between the inner end of the tilling claw shaft 12 and the inner end of the tilling claw shaft 12 mounted through the shaft. Shows a center drive type tiller that is equipped with
The flexible seal device constructed between the tilling shaft 1 and the outer end of the inclined cylinder shaft 2 is constructed as shown in FIG.

That is, a tapered surface 2a that expands radially outward is formed on the inner surface of the outer end of the inclined cylinder shaft 2, and the tapered surface 2a of the inclined cylinder shaft 2 and the boss of the rotation transmission gear 14 are formed at the outer end thereof. A solid elastic O-ring 3 is interposed in the wedge-shaped annular space 5 formed by the outer peripheral surface of the portion 14A, and the elastic O-ring 3 is prevented from being pulled out outwardly. An annular retainer 4 that presses in the insertion direction of 3 is attached to the positioning member 1 of the rotational transmission gear 14.
5 and are integrally connected to each other.

Furthermore, the retainer 4 may be constructed of an elastic ring.

[Brief explanation of drawings]

The drawings show an embodiment of the flexible sealing device for an inclined claw shaft according to the present invention, FIG. 1 is a partially cutaway front view of the main part showing the tilling device, FIG. 2 is an enlarged longitudinal sectional view of the main part, and FIG. The figure is an enlarged longitudinal cross-sectional view of the main parts of a conventional device. 1... Cultivation axis, 2... Inclined cylinder axis, 3.
...Elastic O-ring, 4...Removal stopper,
5... Wedge-shaped annular space.

Claims (1)

[Claims for Utility Model Registration] [F] The outer end of an inclined cylindrical shaft 2 rotatably supported around an axis slightly inclined with respect to the axis a of the tilling shaft 1, and the tilling shaft. A solid elastic O-ring 3 is interposed between the tilling shaft 1 and the tilling shaft 1.
Alternatively, a flexible sealing device for an inclined claw shaft is provided with a retainer 4 which is fixedly supported by the inclined cylinder shaft 2 and presses the elastic O-ring 3 in the insertion direction thereof. '■ The removal stopper 4 is composed of an elastic ring.
A flexible seal device for an inclined claw shaft as described in 2.