JPH0744860Y2 - Sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a sealing device, and more particularly to a sealing device suitable for use as a seal for a toner unit used in office equipment such as a copying machine or a printer.

[Prior Art] Conventionally, as a toner unit used in office equipment such as a copying machine and a printer, a sealing device as shown in FIG. 4 has been used.

In order to protect the bearing 51 that supports the rotating shaft 50, this device has an annular member such as a V ring 52 and an annular felt.
53, an annular dust seal 54, an annular holding plate 55 that supports the felt 53, an annular holding plate 56 that supports the dust seal 54
It is configured with.

The V ring 52 rotates together with the rotary shaft 50, and the lip 57
By sliding on the side surface of the holding plate 55, the sealing property is secured.

Further, with respect to the toner powder that has entered from the V ring 52 side, the felt 53 and the dust seal 54 slide on the outer peripheral surface of the rotary shaft 50 to ensure the sealing property.

[Problems to be Solved by the Invention] However, in the conventional sealing device, since powder is directly applied to the V ring 52, the powder adheres to the surface of the V ring 52,
There is a problem that the elastic force of the V ring 52 is reduced.

Therefore, the sealability may be deteriorated due to the wear of the V ring 52.

An object of the present invention is to provide a sealing device capable of suppressing the adhesion of fluid as an object to be sealed.

[Means for Solving the Problems]

To achieve the above object, the present invention seals between a relatively rotatable housing and a rotating shaft through a bearing, and has an annular member fixed to the rotating shaft. A sealing device in which a lip that slides on a peripheral surface or an end surface provided on the housing side is formed on the annular member, and a spiral groove extending in an outer radial direction is provided on a side surface of the annular member opposite to the bearing. Have

[Action]

Since the present invention has the above-mentioned structure, when the housing and the rotating shaft are relatively rotated, the annular member rotates integrally with the rotating shaft, and the lip of the annular member is attached to the circumferential surface or the end surface on the housing side. A sliding contact is made with a seal therebetween. Further, the object to be sealed which comes into contact with the annular member is scattered radially outward by the centrifugal force acting on the annular member, and the spiral groove provided on the side surface of the annular member enhances the effect of the centrifugal force. Will be done.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a V ring that is an annular member
Reference numeral 10 denotes a sealing device formed in a substantially annular shape, and is inserted into a rotary shaft insertion passage 13 between a rotary shaft 11 and a housing 12 shown in FIG. It is adapted to be pressed against the wall surface of the housing 12.

That is, the V ring 10 is an annular ring body 1
4, the insertion hole 15 and the annular lips 16, 17 are provided, and the lip 17 is in pressure contact with the wall surface of the housing 12, and the lip 16 is in pressure contact with an annular pressing plate 18.

A plurality of spiral grooves 20 are formed on the side surface 19 of the V ring 10 along the radial direction of the rotating shaft 11.

The spiral groove 20 extends from the inner peripheral side toward the outer peripheral side, and is formed such that the width of the outer peripheral side is gradually wider than that of the inner peripheral side.

When the V-ring 10 protects the bearing 21 that supports the rotating shaft 11, the V-ring 10 is inserted into the rotating shaft insertion passage 13 together with the annular felt 22 and the annular dust seal 23.

Then, the felt 22 is supported by the pressing plate 18,
The dust seal 23 is supported by the holding plate 24.

In the above structure, the toner powder as the object to be sealed is supplied to the side surface 19 side of the V ring 10.

Then, the toner powder sealed on the side surface 19 side of the V ring 10 is scattered to the outer peripheral side of the V ring 10 by centrifugal force when the V ring 10 rotates together with the rotating shaft 11.

At this time, since the toner powder moves along the spiral groove 20, it is forcibly scattered to the outer peripheral side of the V ring 10.

Therefore, the amount of toner powder reaching the lip 16 side can be suppressed to an extremely small amount.

Therefore, it becomes possible to sufficiently secure the sealing property against the toner powder.

[Effect of device]

As described above, according to the present invention, when the housing and the rotary shaft are relatively rotated, the annular member rotates integrally with the rotary shaft, and the lip of the annular member slides on the circumferential surface or the end surface on the housing side. It makes contact and seals between them. In addition, the object to be sealed that comes into contact with the annular member is
The centrifugal force acting on the annular member scatters radially outward, and the effect of this centrifugal force is further enhanced by the spiral groove of the annular member. Can be prevented from sticking, and the object to be sealed can be prevented from reaching the bearing side beyond the lip of the annular member. Therefore, the object to be sealed does not act on the bearing at all, and the durability can be greatly improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a sectional view of an essential part of a toner unit in which a sealing device according to the present invention is used. FIG. 4 is a sectional view of an essential part showing the structure of a conventional example. 10,52 …… V ring (annular member) 11,50 …… Rotary shaft 12 …… Housing 13 …… Rotary shaft insertion passage 14 …… Ring body 15 …… Insertion hole 16,17 …… Lip 18,24,55 , 56 ...... Presser plate 19 ...... Side 20 ...... Lateral groove 21,51 …… Bearing 22,53 …… Felt 23,54 …… Dust seal

Claims (1)

[Scope of utility model registration request] 1. A ring for sealing between a relatively rotatable housing (12) and a rotary shaft (11) via a bearing (21), the ring being fixed to the rotary shaft (11). Material (10)
In the sealing device having the annular member (10) and a lip (16) provided on the housing (12) side and sliding on the peripheral surface or the end surface, the anti-bearing of the annular member (10) is provided. A sealing device, characterized in that a spiral groove (20) extending in the outer diameter direction is provided on the side surface on the side.