Seal unit, joint, industrial device and method
AssigneeABB Schweiz AG
InventorsJiangwei Huang, Johan Ernlund, Tomas Botold, Shanghua Li
Life of this patent
Estimating the term…
Abstract
A seal unit for being installed in a joint, the seal unit having a first adapting ring concentric with a seal unit axis; a dynamic seal in contact with, and allowed to slide relative to, the first adapting ring; and a holding device configured to adopt two states, at least one of the states being associated with a unique seal unit width of the seal unit along the seal unit axis; wherein the holding device is configured to hold the dynamic seal compressed against the first adapting ring in at least one of the states. A joint, an industrial device and a method of installing a seal unit are also provided.
Claims19
A seal unit for being installed in a joint, the seal unit comprising:
- a first adapting ring concentric with a seal unit axis;
- a dynamic seal in contact with, and allowed to slide relative to, the first adapting ring;
- and
- a holding device configured to adopt two states, at least one of the states being associated with a unique seal unit width of the seal unit along the seal unit axis;
- wherein the holding device is configured to hold the dynamic seal compressed against the first adapting ring in at least one of the states.
A joint comprising:
- a first part and a second part rotatable relative to each other about a rotation axis;
- a gap between the first part and the second part;
- and
- a seal unit provided in the gap, the seal unit having:
- a first adapting ring concentric with a seal unit axis;
- a dynamic seal in contact with, and allowed to slide relative to, the first adapting ring;
- and
- a holding device configured to adopt two states, at least one of the states being associated with a unique seal unit width of the seal unit along the seal unit axis;
- wherein the holding device is configured to hold the dynamic seal compressed against the first adapting ring in at least one of the states.
An industrial device, such as an industrial robot, comprising:
- a joint which has:
- a first part and a second part rotatable relative to each other about a rotation axis;
- a gap between the first part and the second part;
- and
- a seal unit provided in the gap, the seal unit having:
- a first adapting ring concentric with a seal unit axis;
- a dynamic seal in contact with, and allowed to slide relative to, the first adapting ring;
- and
- a holding device configured to adopt two states, at least one of the states being associated with a unique seal unit width of the seal unit along the seal unit axis;
- wherein the holding device is configured to hold the dynamic seal compressed against the first adapting ring in at least one of the states.
A method of installing a seal unit in a joint, the method comprising:
- providing a joint including a first part and a second part rotatable relative to each other about a rotation axis;
- providing a seal unit including a first adapting ring concentric with a seal unit axis, a dynamic seal in contact with, and allowed to slide relative to, the first adapting ring;
- and
- adjusting, by means of the seal unit, a seal unit width on a basis of a predefined preload in the dynamic seal.
Dependencies are inferred from the claim text.