Dual Angle Wedge Retention System
AssigneeChengdu Best Diamond Bit Co., Ltd
InventorXiao RUI
Life of this patent
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Abstract
At least one labyrinth seal assembly is disposed within a roller cutter of a roller reamer. A first labyrinth seal assembly of a roller cutter is positioned toward a first pillow block of a cutter cartridge that includes the roller cutter. A bearing shaft of the cutter cartridge extends through an inner channel of the roller cutter. The cutter cartridge is retained in an axial recess of a tool body of the roller reamer via a compound and separate wedging of each of the two pillow blocks into a same axial recess by means of a shaped wedge particularly specialized to improve secure coupling of the assembly and reduce rattling of components. Each pillow block is rotatably coupled to the bearing shaft at an opposing end of the roller cutter.
Claims20
A roller reamer coupled with a downhole tool body (“tool”) within a first axial recess of the tool, the roller reamer comprising:
- a retention assembly comprising a first roller cutter, a first pillow block and a first wedge, wherein the first roller cutter is rotatably coupled with the first pillow block;
- the roller reamer having a central point that is located at a center of mass of the first roller cutter;
- the first pillow block positioned within the first axial recess and having a block top side and a planar block internal side, wherein the block top side is positioned distal from a central axis of the tool, and the planar block internal side is positioned proximate to the first wedge;
- the planar block internal side shaped to taper in two directions, such that the planar block internal side tapers toward the first block top side of the first pillow block as the first block planar internal side extends away from the central Z axis of the tool body, and the first planar internal side further tapers towards the center of mass of the first roller cutter;
- the first wedge having a wedge planar internal side positioned proximate to the planar block internal side, wherein the wedge planar internal side tapers toward the central axis of the tool, and the first wedge planar internal side further tapers away from the center point CP of the central point.
A retention assembly of a roller reamer, the roller reamer comprising at least a first roller rotatably coupled with a roller reamer body, the retention assembly comprising:
- a pillow block, the pillow block fitting into a recess of the roller reamer and presenting a bottom side, a top side and a planar tapered face extending between the bottom side and the top side, the planar tapered face tapered along each of two orthogonal axes, whereby the pillow block has a maximum surface area at the bottom side;
- and
- a dual tapered wedge, the dual tapered wedge fitting into the recess of the roller reamer contemporaneously with the pillow block, wherein the dual tapered wedge presents a wedge planar internal side for placement against the pillow block planar tapered surface, and the wedge planar internal side is tapered along the two orthogonal axes;
- and
- the dual tapered wedge having a maximum surface area at an upper side, wherein when the retention assembly is coupled with the roller reamer body the upper side is positioned proximate to the pillow block top side and distal from the pillow block bottom side.
Dependencies are inferred from the claim text.