JPH0527740Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is arranged between a shaft and a housing that are concentrically combined with each other to perform relative rotational movement, and prevent external dust, water, etc. from entering the interior. This invention relates to an end face seal that prevents.

(Prior art) Rubber-like The annular body is made of an elastic material and has a substantially conical shape, and is fixed to one of the shaft and the housing so that it slides in elastic contact with a radial surface formed on the other of the shaft and the housing. Constructed end seals are widely used.

The one shown in FIG. 2 is an example of the above-mentioned end face seal, which includes an annular base 1 made of an annular body with a substantially square cross-sectional shape and a substantially conical shape extending diagonally outward from one end of the annular base 1. The annular base 1 is installed and fixed in an annular groove 7 formed on the outer side of the end of the housing 6, and the end seal lip 5 is attached to a shaft 8 passing through the housing 6. It is slid while being in elastic contact with the formed radial surface 9.

(Problems to be solved by the invention) In the conventional end seal described above, the function of preventing the intrusion of external dust, etc. is exclusively performed by the end seal lip, which is made of a rubber-like elastic material and has a substantially conical shape. The end seal lip 5 is retained by elastic contact against the radial surface 9 of
The heat generated due to the sliding of the radial surface 9 causes the end face seal lip 5 to sag, reducing the contact pressure against the radial surface 9 and causing a deterioration of the sealing function.

The object of the present invention is to provide an end seal structure capable of suppressing the deterioration of the sealing function due to the settling of the end seal lip caused by sliding on the radial surface in the conventional end seal described above.

(Means for Solving the Problems) The present invention takes into consideration the problems in the end face seals according to the conventional technology described above, and provides a radially outward seal formed on one side of the housing and shaft that are concentrically combined with each other. an annular base installed in an annular groove opening to the annular groove, and an inward annular protrusion that contacts the bottom surface of the annular groove at one axial end on the inner periphery of the annular base; Between the bottom and the bottom
a spring groove into which a garter spring is inserted is provided on the outer periphery of the annular base, and an end face extending obliquely in the outer radial direction from the axial end of the annular base where the annular protrusion is provided and exhibiting a substantially conical shape; The end seal lip is an end seal made of a rubber-like elastic material and configured to contact a radial surface formed on the other of the housing and the shaft.

(Function) In the end face seal according to the present invention having the above-described configuration, the annular base pushes the gap between the annular base and the bottom of the annular groove by the garter spring inserted into the spring groove on the outer periphery of the annular base. It deforms inward as if crushing, tilting the posture of the inward annular projection attached to one axial end, and at the same time, the deformation is transmitted to the end face seal lip, causing the radial surface formed on the housing or shaft to incline. contact pressure is strengthened.

(Embodiment) In the embodiment shown in FIG. An annular protrusion 2 is attached to the annular base 1 in a spring groove 3 formed on the outer circumferential side of the annular base 1.
A garter spring 4 is inserted to urge the radially inward direction, and an end face seal lip 5 extending diagonally outward and having a substantially conical shape is attached to the outer peripheral side of the axial end to which the annular projection 2 is attached. It is in elastic contact with a radial surface 9 formed on the shaft 8 side.

In the illustrated embodiment, an annular groove 7 into which the annular base 1 is attached is formed on the housing 6 side, and a radial surface 9 on which the end seal lip 5 slides is formed on the shaft 8 side. It is also possible to adopt an embodiment in which the annular groove 7 into which the base portion 1 is mounted is formed on the shaft 8 side, and the radial surface 9 on which the end seal lip 5 slides is formed on the housing 6 side.

(Effects of the invention) As described above, the end seal according to the invention has
an annular base installed in an annular groove opening radially outward formed in one of the housing and the shaft that are concentrically assembled with each other; An inward annular protrusion is provided in contact with the bottom surface of the groove, and there is a gap between the annular base and the bottom surface of the annular groove, and a spring groove into which a garter spring is inserted is provided on the outer periphery of the annular base. It has an end seal lip that extends obliquely in the outer radial direction from the axial end portion provided with the annular projection and has a substantially conical shape, and the end seal lip contacts a radial surface formed on the other of the housing and the shaft. With this structure, the garter spring inserted into the spring groove on the outer periphery of the annular base deforms the annular base inward so as to crush the space between the annular base and the bottom of the annular groove. , the posture of the inward annular projection attached to one end in the axial direction is tilted, and at the same time, the deformation is transmitted to the end seal lip, applying contact pressure to the radial surface formed on the housing or shaft. Therefore, even when the elastic force of the end seal lip decreases due to heat generation due to the sliding of the end seal lip and the radial surface, the contact pressure between the end seal lip and the radial surface is maintained at an appropriate level, and the contact pressure at the contact portion is maintained. The sealing function that prevents the intrusion of external dust etc. is maintained in a normal state.
Further, this contact pressure is generated by deformation from the inner circumferential end of the end face seal of the present invention, and since the deformation of the entire seal is uniform, it is possible to create a seal that is less prone to fatigue at a specific location.

Furthermore, since the garter spring can be placed on the sealed side and is not exposed to external muddy water, corrosion of the garter spring can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of an example of a conventional end seal. DESCRIPTION OF SYMBOLS 1... Annular base, 2... Annular projection, 3... Spring groove, 4... Garter spring, 5... End face seal lip, 6... Housing, 7... Annular groove, 8... Shaft, 9... Diameter direction plane.

Claims (1)

[Scope of utility model registration request] An annular base 1 is installed in an annular groove 7 that opens outward in the radial direction and is formed in one of the housing 6 and the shaft 8 that are concentrically assembled with each other, and an annular groove 7 that is formed on one side in the axial direction on the inner periphery of the annular base 1. Said annular groove 7 at the end
An inward annular projection 2 is provided in contact with the bottom surface of the annular groove 7, and there is a gap 10 between the annular base 1 and the bottom surface of the annular groove 7, and a spring groove 3 into which a garter spring 4 is inserted is provided on the outer periphery of the annular base 1. The annular base 1 has an end face seal lip 5 extending obliquely in the outer radial direction from the axial end where the annular protrusion 2 is provided and having a substantially conical shape, and the end face seal lip 5 is formed on the housing 6 and the shaft. An end seal made of a rubber-like elastic material that contacts the radial surface 9 formed on the other side.