Sealing device for rolling bearing unit

Patent metadata

Field	Value
Publication number	US-9926979-B2
Application number	US-201615256810-A
Country	US
Kind code	B2
Filing date	Sep 6, 2016
Priority date	Sep 3, 2015
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A sealing device for a bearing unit, where the unit has a radially outer ring, two rows of rolling bodies arranged, respectively, between the radially outer ring and a pair of radially inner rings. The sealing device further provides a spacer including an annular groove and configured to be arranged between the radially inner rings of the bearing unit and a seal housed inside the groove of the spacer. The seal is “U” shaped, defines a volume internally and is configured to be mounted in the annular groove with the concavity directed towards the axis of symmetry of the bearing unit.

First claim

The invention claimed is:

1. A sealing device for a bearing unit, the unit providing a radially outer ring, two rows of rolling bodies arranged, respectively, between the radially outer ring and a pair of radially inner rings, the sealing device comprising:
a spacer provided with at least one annular groove and arranged between the radially inner rings of the bearing unit,
at least one seal housed inside the at least one groove of the spacer, wherein
the seal is “U” shaped, the seal defines an internal volume and is configured to be mounted inside the annular groove with the concavity directed towards the axis of symmetry of the bearing unit.

2. The sealing device according to claim 1 , wherein the difference between the half lengths of a radially outer annular surface of the spacer and a radially inner annular surface of the spacer is equal to a predetermined value (d).

3. The sealing device according to claim 1 , wherein the annular groove has a ratio between a depth (a) and a height (b) that is greater than one.

4. The sealing device according to claim 3 , wherein the height (h) of the seal is smaller than the height (b) of the groove.

5. The sealing device according to claim 1 , wherein the annular groove is provided with a rough radially outer cylindrical surface.

6. The sealing device according to claim 1 , wherein the seal is asymmetrically “U” shaped.

7. The sealing device according to claim 1 , wherein the seal has a roughened outer cylindrical surface.

8. The sealing device according to claim 1 , wherein the seal has a concavity in the form of a keyhole.

9. A bearing unit comprising:
a radially outer race,
two rows of rolling bodies arranged, respectively, between the radially outer ring,
a pair of radially inner rings, and
a sealing device having a spacer provided with at least one annular groove and arranged between the radially inner rings of the bearing unit,
at least one seal housed inside the at least one groove of the spacer, wherein
the seal is “U” shaped, the seal defines an internal volume and is configured to be mounted inside the annular groove with the concavity directed towards the axis of symmetry of the bearing unit, and is arranged in a central position between the radially inner rings.

Assignees

• Capozzi Marco Giovanni Francesco
• Kogler Christian
• Skf Ab

Inventors

• Capozzi Marco Giovanni Francesco
• Kogler Christian

Classifications

• F16C33/60

  divided {or split, e.g. comprising two juxtaposed rings} · CPC title

• F16C19/386

  in O-arrangement · CPC title

• F16C33/768

  between relatively stationary parts, i.e. static seals · CPC title

• F16C33/7803 Primary

  suited for particular types of rolling bearings · CPC title

• F16C33/783

  of the mounting region · CPC title