Rotary drilling bit

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/22 (2006.01)

Patent

CA 2354517

The present invention relates to a rotary drilling bit, which comprises a leg (1) with a journal (5) and a rotary cutter (3) rotatably mounted on the journal (5), which cutter carries rock cutting means (4), said rotary cutter (3) being rotatably mounted on the journal (5) by means of radial cylinder bearings (7, 9, 10, 11, 12, 13), said rotary cutter (3) being secured in the axial direction on the journal (5) by a flange (22), which cooperates with rolling elements of at least one of the radial cylinder bearings, and wherein also axial bearings (14, 15, 16) are provided between the rotary cutter (3) and the journal (5), and wherein means (24) for inserting rolling elements (7; 11) to a pair of races (9, 10; 12, 13) for forming a radial cylinder bearing is provided in the leg (1) after the rotary cutter (3) has been mounted to the journal (5), and wherein an element (25) to block said means (24) for inserting rolling elements is provided in connection with said means (24) for inserting rolling elements after completion of inserting the rolling elements. The flange (22) is provided with a recess (23), which allows passage of the rolling elements (7) that are mounted after mounting of the rotary cutter (3) to the journal (5). The element consists of a locking pin (25), which at its innermost end in the mounted position is provided with a lip (27), which occupies only a part of the cross-section of the locking pin (25).

L'invention concerne un trépan rotatif comprenant une tête (1) équipée d'un palier (5) et d'un outil (3) de coupe rotatif monté de manière rotative sur le palier (5). Cet outil de coupe porte des moyens (4) perforateurs de roche. Il est monté de manière rotative sur le palier (5) au moyen de roulements (7, 9, 10, 11, 12, 13) radiaux à rouleaux, et il est fixé dans la direction axiale du palier (5) par un rebord (22), qui coopère avec les éléments de roulement d'au moins un des roulements radiaux à rouleaux. Des roulements (14, 15, 16) axiaux sont en outre montés entre l'outil (3) de coupe rotatif et le palier (5), et la tête comprend en outre des moyens (24) qui une fois que l'outil (3) de coupe rotatif a été monté sur le palier (5) permettent l'insertion d'éléments (7; 11) de roulement dans deux chemins (9, 10; 12, 13) de roulement afin de former un roulement à rouleau radial. Un élément (25) associé aux moyens (24) d'insertion d'éléments de roulement permet de bloquer ces derniers une fois qu'ils ont été insérés. Le rebord (22) comprend un évidement (23) qui laisse passer les éléments (7) de roulement lors de l'installation de ces derniers, après le montage l'outil (3) de coupe rotatif sur le palier (5). Cet élément est constitué d'un axe (25) de verrouillage dont l'extrémité intérieure présente en position de montage une avancée (27), qui n'occupe qu'une partie de la section de l'axe (25) de verrouillage.

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