U.S. Philips Corporation

Carel J Thijsse

Leonardus P Tielemans

Jelm Franse

Robert C Boereboom

Ronny Verzijl

A dynamic groove bearing (9, 83, 95) with an inner bearing pan (15) and an outer bearing part (17) which is rotatable about the inner bearing part (15). The bearing parts (15, 17) are provided with cooperating bearing surfaces (23, 35) between which a bearing gap (45) is present filled with a liquid lubricant (75). The bearing surface (35) of at least one of the bearing pans (17) is provided with a pattern of grooves (51, 53). The outer bearing part (17) has an annular barrier (69, 87, 99) which is raised with respect to the bearing surface (35) of the outer bearing part (17) and which bounds the bearing gap (45). The barrier (69, 87, 99) prevents leakage of the liquid lubricant (75) from the dynamic groove bearing (9, 83, 95) at comparatively high rotation speeds of the dynamic groove bearing (9, 83, 95). The dynamic groove bearing (9, 83, 95) can be used in an electric motor (1, 81, 93) of a data storage unit (113) in which an information disc (115), for example a hard disk of a computer, can be rotated relative to a scanning unit (121) with a magnetic head (123) by the electric motor (1, 81, 93).

Dynamic groove bearing with a lubricant barrier

A dry-shaving apparatus includes a shaving unit comprising an external shaving member provided with hair-entry apertures; and an internal shaving member associated with and rotatable relative to the external shaving member, the internal shaving member being formed with a plurality of cutting blades for engagement with the external shaving member. A first resilient element engages the internal shaving member and exerts pressure thereagainst. A ball bearing member is centrally positioned between the external shaving member and the internal shaving member and engages the internal shaving member. A second resilient element is associated with the external shaving member and engages the ball bearing member.

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Eindhoven, Netherlands

Carel J Thijsse