JP2557580Y2 - Packing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in packing. The packing of the present invention is used, for example, as a toner seal.

[0002]

Heretofore, as shown in FIG. 3, the inner circumference has a lip 1 and the outer peripheral lip 2, the height h of the inner circumferential lip 1
There is known a packing made of a synthetic resin in which ₀ is gradually lowered from a specific position on the circumference to a 180-degree symmetric position. Inner circumference
The reason why the height h ₀ of the lip 1 is different on the circumference in this way is that the inner peripheral lip 1 is in contact with the rotating shaft and the flow of the target seal such as toner is taken into consideration. Specific position is twelve o'clock a position and try to fit it, for example, in the face of the clock, one hundred eighty degree symmetrical position is a six o'clock position, clockwise over from the twelve o'clock position to the six o'clock position and information on each of the counterclockwise height h ₀ becomes gradually lower. The height H ₀ and the width T ₀ of the outer lip 2 are constant over the entire circumference. This
Is annular in the periphery of the shaft hole 51a of the housing 51.
The inner peripheral lip 1 is fitted to the step portion 51 b and
The outer peripheral lip 2 is brought into sliding contact with the inner peripheral surface of the annular stepped portion 51b.
Is to be closely related to

[0003]

The [devised It is an object of the prior art described above, the height h ₀ of the inner circumferential lip 1 to have varied over the circumference as described above, the inner circumferential lip at each position in the circumferential The contact state with the first rotating shaft is different, the surface pressure is not constant, and there is a problem in the sealing property.

[0004]

SUMMARY OF THE INVENTION In view of the above, the present invention has been devised in order to solve the above-mentioned problems in the prior art. As described above, in a packing having an inner peripheral lip and an outer peripheral lip, and the height dimension of the inner peripheral lip is gradually reduced from a specific position on the circumference to a symmetrical position of 180 degrees, the height of the outer peripheral lip is A packing is provided in which the size is gradually increased from the specific position to the 180-degree symmetric position. Further, as shown in claim 2, a packing having an inner peripheral lip and an outer peripheral lip, wherein the height dimension of the inner peripheral lip is gradually reduced from a specific position on the circumference to a position symmetrical about 180 degrees, A packing is provided, wherein the width dimension of the outer peripheral lip is gradually increased from the specific position to the 180-degree symmetric position.

[0005]

According to the above construction, the state of contact of the inner peripheral lip with the rotating shaft is the same over the entire circumference, and the surface pressure is constant over the entire circumference. be able to.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

The packing of FIG. 1 relates to claim 1 and has an inner peripheral lip 1 and an outer peripheral lip 2, and the height dimension h ₁ of the inner peripheral lip 1 is set at a specific position on the circumference. It is gradually lowered toward the ten-degree symmetric position, and has the following features. The packing is made of synthetic resin. That has been gradually increasing forming height dimension H ₁ of the circumferential lip 2 over to the one hundred and eighty degrees symmetric position from the specific position,
The non-uniform surface pressure of the inner peripheral lip 1 is adjusted by the reaction force at the time of mounting, and the surface pressure is kept constant over the entire circumference. Twelve o'clock position is the lowest and six o'clock position is the highest in the example of the clock face described above. The width dimension T ₁ of the outer peripheral lip 2 is constant over the entire circumference. Also this packing is
As in the prior art, the annular shape around the shaft hole of the housing
The inner peripheral lip 1 is fitted on the step and slides on the peripheral surface of the rotating shaft.
The outer lip 2 is brought into close contact with the inner surface of the annular step.
It is.

The packing shown in FIG. 2 is according to claim 2 and has an inner peripheral lip 1 and an outer peripheral lip 2, and the height h ₂ of the inner peripheral lip 1 is set at a specific position on the circumference from the specific position. It is gradually lowered toward the ten-degree symmetric position, and has the following features. The packing is made of synthetic resin. That it has been gradually thicker molded width T ₂ of the circumferential lip 2 over to the one hundred and eighty degrees symmetric position from the specific position, instrumentation
The non-uniform surface pressure of the inner lip 1 is adjusted by the reaction force at the time of wearing, and the surface pressure is kept constant over the entire circumference. In the example of the clock face described above, the 12 o'clock position is the thinnest, and the 6 o'clock position is the thickest. Height of H ₂ circumferential lip 2 is constant over the entire circumference. Also this packing
As in the prior art, the annular shape around the shaft hole of the housing
The inner peripheral lip 1 is fitted on the step and slides on the peripheral surface of the rotating shaft.
The outer lip 2 is brought into close contact with the inner surface of the annular step.
It is.

[0009]

[Effects of the Invention] The present invention has the following effects. That is,
In common with the first and second aspects, the state of contact of the inner peripheral lip with the rotating shaft is the same over the entire circumference, the uneven surface pressure of the inner peripheral lip is adjusted, and the surface pressure is reduced over the entire circumference. , And the sealing performance can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a packing according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a packing according to a second embodiment of the present invention;

FIG. 3 is a cross-sectional view of a packing according to a conventional example.

[Explanation of symbols]

 1 inner lip 2 outer lip

Claims (2)

(57) [Scope of request for utility model registration] An inner lip ( 1 ) has a circumferential lip ( 1 ) and an outer lip ( 2 ) , and a height dimension of the inner lip ( 1 ) gradually increases from a specific position on the circumference to a 180-degree symmetric position. In the packing, the height of the outer peripheral lip ( 2 ) is gradually increased from the specific position to the position of symmetry of 180 degrees. 2. A peripheral lip ( 1 ) and an outer lip ( 2 ) , wherein the height of the inner lip ( 1 ) is gradually increased from a specific position on the circumference to a symmetrical position of 180 degrees. The packing wherein the width dimension of the outer peripheral lip ( 2 ) is gradually increased from the specific position to the 180-degree symmetrical position.