Bearings – Rotary bearing – Antifriction bearing
Reexamination Certificate
1999-02-22
2001-02-20
Marmor, Charles A (Department: 3681)
Bearings
Rotary bearing
Antifriction bearing
C384S445000, C384S446000
Reexamination Certificate
active
06190051
ABSTRACT:
DESCRIPTION
The present invention refers to a roller bearing unit, in particular for the hub of a vehicle wheel, of the kind equipped with a sealing device and a device for measuring the rotating speed of the outer race.
Known measuring devices of the aforementioned type comprise an encoder wheel in the form of an annular disc of plastic or rubber magnetised material, which is rotatably secured to the rotating race of the bearing. In some well-known types of device, the encoder wheel is driven onto the rotating race of the bearing (usually the radially outer race) or onto an element fixedly connected to it.
It has however been found that encoder wheels of this type do not stand up very well to the stress to which they are subjected when they are driven; furthermore, encoder wheels fitted in this way are exposed to the action of external contaminating agents such as water, dust, mud, metal particles from nearby brake devices etc; when said contaminating agents come into contact with said encoder wheels their performance tends to be impaired and the signal produced by a sensor which picks up variations in magnetic flow generated by the rotating encoder wheel can be adversely affected. Metal particles have a particular tendency to adhere to any slight irregularity or roughness in the surface of an encoder wheel made of rubber or plastic magnetised material.
Other well-known kinds of device involve an encoder wheel, made of plastic or rubber which is not yet magnetised, which is vulcanised onto an annular metal support insert and then magnetised together with it. This kind of magnetising technique, besides being both complex and expensive, does not permit the attainment of optimal levels of magnetisation in the encoder wheel.
An aim of the present invention is to realise a robust, reliable arrangement which will remove the risk of the encoder wheel's being damaged during assembly, transport or use.
Another aim of the present invention is to realise a bearing unit equipped with a device for measuring rotation speed to which metal particles attracted by the magnetic encoder wheel will not have a tendency to adhere.
A further aim of the present invention is to realise an arrangement which will protect the magnetised wheel from variations in temperature caused by the proximity of the vehicle's brakes to the hub.
According to the present invention, these and other aims and advantages, as detailed in independent claim
1
, are achieved by a bearing unit equipped with a device for measuring rotation speed integrated with a sealing device and equipped with a metallic insert which performs a dual function as an element of support and protection for the encoder wheel and as the support for a covering seal made of rubber. Other important characteristics of the present invention are defined in dependent claims
2
to
10
.
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European Search Report, 3 pages, dated May, 3, 2000.
Angelo Vignotto
Pierangelo Cherio
Marmor Charles A
Merchant & Gould P.C.
SKF Industrie S.P.A.
Waddell Tisha D.
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