Other

Hutchinson

Hutchinson Worldwide

Patrick Fayaud

Alain Besson

Bernard Branchereau

Laurent Guerbe

Pierre Lecour

Bernard Tissier

The invention relates to displacement encoder for a movable shaft, comprising a sleeve () which is intended to be fixed in rotation to the shaft () and an encoding element () which is made from magnetizable polymer and which is solidly connected to the sleeve, said encoding element being equipped with an encoding zone () having at least one polarized mark. The aforementioned encoding zone of the encoding element is covered with a protective layer () which is made from a polymer having a surface abrasion resistance greater than that of the magnetizable polymer. The invention also relates to a device comprising one such encoder and to a production method thereof.

Encoder for shaft device comprising one such encoder and production method thereof

Displacement encoder for a moving shaft, having a sleeve intended to be clamped on the shaft and an encoding zone having polarized magnetic mark. The encoding zone has permanent magnet disposed against the sleeve and a layer of elastomer is overmolded and adherized on the magnet and on the sleeve.

Displacement encoder, device comprising such an encoder and method of manufacturing such an encoder

A drilling head with a cone rock bit, each cone having a stationary part and a rotary part which rotates about an axis of rotation. Also included is a dynamic sealing device between the stationary part and the rotary part. The sealing device is borne by the rotary party and has a first sealing lip and a second sealing lip, each of which forms a surface of revolution about the axis of rotation. Further, the first and second lips bear respectively against a first bearing face and a second bearing face secured to the stationary part. The first lip is oriented in such a way that it presses against the first bearing face under the action of the pressure, and the second lip is oriented in such a way that it moves away from the second bearing face under the action of the pressure of the lubricating product, so as to allow this product to fill a cavity and compensate for the pressure in the cavity.

Drilling head with a cone rock bit

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Angers, France

Patrick Fayaud