US 11,231,109 B2 · Method for manufacturing sealing device, and sealing device

Abstract

[Problem] To provide a method for manufacturing a sealing device having high pressure-resistance and high durability. Provided is a method for manufacturing a sealing device to be provided between a shaft and an inner surface of a shaft hole in which the shaft is provided, the method comprising: a step for forming an atmosphere-side rigid ring by forming a through-hole in a rigid body by a punching-out process; a step for causing a reinforcement ring for reinforcing an elastic ring to contact the elastic ring in a direction parallel to the axial direction of the shaft, wherein the elastic ring is made of an elastic body, is attached to a liquid-side rigid ring made of a rigid body and disposed inside the shaft hole, is disposed radially inward of the liquid-side rigid ring, and has formed thereon a seal lip that slidably makes sealing contact with the shaft; and a step for causing the atmosphere-side rigid ring to contact the reinforcement ring in a direction parallel to the axial direction of the shaft so that a surface contacted by an end surface of a punch during the punching-out process of the atmosphere-side rigid ring is positioned on an opposite side to the reinforcement ring.

Claims8

Dependent claims

A sealing device to be provided between a shaft and an inner surface of a shaft hole in which the shaft is provided, the sealing device, the shaft, and the shaft hole sharing a common central axis upon assembly, the sealing device comprising:

a liquid-side rigid ring made of a rigid body and provided inside the shaft hole,
an elastic ring which is made of an elastic body, is attached to the liquid-side rigid ring, is provided radially inward of the liquid-side rigid ring, and has formed thereon a seal lip that slidably makes sealing contact with the shaft,
a reinforcement ring which contacts the elastic ring in axial alignment with the shaft and reinforces the elastic ring, and
an atmosphere-side rigid ring which is made of a rigid body, contacts the reinforcement ring in axial alignment with the shaft, and reinforces the reinforcement ring,
wherein:
the atmosphere-side rigid ring has an inner radial peripheral surface having a corner portion that contacts the reinforcement ring and has an inclined surface that extends radially outward toward the reinforcement ring;
and
the inclined surface of the corner portion of the atmosphere-side rigid ring has a maximum diameter that is smaller than an outer diameter of the reinforcement ring that contacts the atmosphere-side rigid ring.

5 more elements

a liquid-side rigid ring made of a rigid body and provided in the shaft hole,
an elastic ring which is made of an elastic body, is attached to the liquid-side rigid ring, is disposed radially inward of the liquid-side rigid ring, and has formed thereon a seal lip that slidably makes sealing contact with the shaft,
a reinforcement ring which contacts the elastic ring in axial alignment with the shaft and reinforces the elastic ring, and
an atmosphere-side rigid ring which is made of a rigid body, contacts the reinforcement ring in axial alignment with the shaft, and reinforces the reinforcement ring,
wherein:
the atmosphere-side rigid ring has an inner radial peripheral surface having (i) a first corner portion that contacts the reinforcement ring and has an inclined surface that extends radially outward toward the reinforcement ring;
and (ii) a second corner portion on an opposite side to the first corner portion and has an inclined surface that extends radially outward away from the reinforcement ring;
and
the inclined surface of the first corner portion has a length that is smaller than a length of the inclined surface of the second corner portion of the atmosphere-side rigid ring.

6 more elements

Dependencies are inferred from the claim text.

Method for manufacturing sealing device, and sealing device

Life of this patent

Method for manufacturing sealing device, and sealing device

Life of this patent

Abstract

Claims8