Title: Axial bearing for rotary drill bit

Abstract: An unsealed rotary drill of the type comprising a bearing shaft, a roller rotatably mounted on the shaft, cutting inserts carried by the roller, bearing for rotatably supporting the roller on the shaft, and a flushing channel terminating at an end surface of the bearing shaft for conducting cooling air to the bearing. The bearing includes an axial bearing comprising an insert plate formed of sintered hard metal alloy, and a supporting plate formed of a material which is less hard and less wear resistant than the metal alloy. The supporting plate contains a solid lubricant. The supporting plate and the insert plate present opposed bearing surfaces. The insert plate is mounted in the end surface of the bearing shaft such that a rear surface of the insert plate is acted upon by cooling air from the flushing channel.

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Inventors: Kling, Knut A. (Sandviken, SE)

Application Number: 909117
Filing Date: 1978-05-24
Publication_date: 1980-03-25
Assignee: Sandvik Aktiebolag (Sandviken, SE)
Primary Class(es): 384/93 175/17, 175/337, 384/95
Other Classes:
US Patent Ref:

2880970	Apr, 1959	Swart	175/337.
3921735	Nov, 1975	Dysart	308/8.
3995917	Dec, 1976	Quinlan	308/8.
4098358	Jul, 1978	Klima	175/337.
4109974	Aug, 1978	Svanstrom et al.	308/8.

Other Refs:
Primary Examiner: Frankfort, Charles E.
Assistant Examiner:
Attorney: Burns, Doane, Swecker & Mathis