Sealing arrangement having multiple ring completely covered by elastomeric sealing material

• US 5,713,577 A
• Filed: 01/24/1996
• Issued: 02/03/1998
• Est. Priority Date: 02/03/1995
• Status: Expired due to Term

• Current Assignee: Firma Carl Freudenberg
• Original Assignee: Firma Carl Freudenberg
• Inventors: Burger, Stefan, Kober, Horst, Eckel, Hans-Gerd, Lannert, Berthold
• Primary Examiner(s): Cummings, Scott
• Application Number:
  US08/590,992
• Time in Patent Office: 741 Days
• Field of Search: 277/2, 277/80, 277/37, 277/152, 384/448, 384/484, 384/485, 384/486
• US Class Current: 277/574
• CPC Class Codes: F16C 2326/02 Wheel hubs or castors
• CPC Class Codes: F16C 33/7853 with one or more sealing lips to contact the inner race
• CPC Class Codes: F16C 41/007 Encoders, e.g. parts with a plurality of alternating magnetic poles
• CPC Class Codes: F16J 15/3252 with rigid casings or supports
• CPC Class Codes: G01P 3/443 mounted in bearings bearings F16C
• CPC Class Codes: G01P 3/487 delivered by rotating magnets
• CPC Class Codes: Y10T 29/49703 Sealing
• CPC Class Codes: Y10T 29/49982 Coating

Abstract

A sealing arrangement including a sealing ring with a support ring extending substantially in a radial direction. The support ring is joined in the radial direction to a first sealing element that lies in contact with and is nonrotatable with respect to a first machine element to form a static seal. The support ring is also joined in the radial direction to a second sealing element that is placed against a second machine element rotatably with respect to the second machine element to create a dynamic seal. The first and second sealing elements are each made of an elastomeric material, and at least one multipole ring that can move past a rotational speed sensor. The multipole ring is made of a pasty, hardenable, and magnetizable material that is arranged as a intermediate layer of film-like thinness on the side of the support ring facing the rotational speed sensor. The multipole ring has north and south poles alternating in the circumferential direction and extending in the radial direction, and the multipole ring is completely covered by the elastomeric material of the first and/or second sealing elements.

Claims

1. A sealing arrangement comprising:

a first machine element and a second machine element; and

a sealing ring comprising;

a support ring extending substantially in a radial direction;

a first sealing element joined in said radial direction to said support ring, said first sealing element contacting said first machine element and being nonrotatable with respect to said first machine element, to thereby create a static seal;

a second sealing element joined in said radial direction to said support ring, said second sealing element contacting said second machine element and being rotatable with respect to said second machine element, to thereby create a dynamic seal, said first and second sealing elements each being made of an elastomeric material; and

a multipole ring made of a pasty, hardenable, and magnetizable material, said multipole ring comprising an intermediate layer of film-like thinness on a side of said support ring facing a rotational speed sensor, said multipole ring having north and south poles alternating in a circumferential direction and extending in said radial direction, and wherein said multipole ring is completely covered by said elastomeric material of one of said first or second sealing elements.

2. The sealing arrangement of claim 1, wherein:

said multipole ring comprises at least two magnetic materials differing from one another.

3. The sealing arrangement of claim 2, wherein:

said magnetic materials have a substantially homogeneous distribution within said multipole ring.

4. The sealing arrangement of claim 2, wherein:

said magnetic materials are joined to one another in layered fashion.

5. The sealing arrangement of claim 1, wherein:

said multipole ring and said support ring are adhesively joined and form a preassembled unit.

6. The sealing arrangement of claim 1, wherein:

said first and second sealing elements are formed integrally and continuously with one another and of a uniform material.