CN2429681Y - Universal shaft coupler for screw rod drilling tool - Google Patents

Abstract

The utility model relates to a shaft coupling joint for universal shafts of threaded rod drilling tools, which is provided with a left half shaft coupling joint and a right half shaft coupling joint. Rolling balls used for bearing axial pressure is arranged between the opposite ends of the two half shaft coupling joints, and at least one layer of corrugated pipe used for transferring torsion is connected between the two half shaft coupling joints. The utility model can meet the transmission requirements of single-bending drilling tools, double-bending drilling tools and general drilling tools in threaded rod drilling tools nicely and can prolong the service life.

Description

Helicoid hydraulic motor cardan shaft shaft coupling

The utility model relates to the coupling technical field, particularly relates to a kind of elastic coupling flexible coupling.

The cardan shaft of the helicoid hydraulic motor of oil field welldrilling, be a kind of work under bad environment, bear that moment of torsion is big, radial displacement big (throw of eccentric is big), require the service behaviour height and the cardan shaft of the little specific use of working space, its connection form mainly contains two kinds, a kind of employing plum petal type coupling, the another kind of employing scratched the axle connection, the former is because of reasons in structure, must under overload state, move, thereby operating life is very short, though the latter is simple in structure, but bearing under the big state of stress alternation and flexural stress, fatiguability damages, thereby has short problem in working life equally.The ZL97221977.3 patent provides a kind of flange-type bellows elastic coupling flexible coupling, and this coupling can not bear axial pressure, and size is bigger, and the cardan shaft that can not be used for helicoid hydraulic motor connects.

The purpose of this utility model is that a kind of coupling that is specially adapted to the long service life of helicoid hydraulic motor cardan shaft connection will be provided.

For achieving the above object, the technical solution of the utility model is: it has left and right two half-couplinves, between the relative end of two half-couplinves the ball that bears axial pressure is installed, and is connected with one deck bellows at least between two half-couplinves.

Torque that the wall thickness of the utility model bellows and the number of plies are transmitted as required and bulk decision, when being connected with two-layer above bellows between two half-couplinves, the end face of one of them half-coupling is stepped, second half shaft coupling circumferentially be fixed with annular cushion block, the two ends of the bellows of innermost layer are welded on respectively on two half-couplinves, one end of all the other bellowss is welded on the cushion block, and end is welded on second half shaft coupling in addition.

The utility model utilizes the elastic element bellows to come transmitting torque, bear axial pressure by ball, because bellows is axially having easily deformable characteristic, angle between the diaxon of the left and right sides can change bigger, thereby can solve the transmission difficult problem of helicoid hydraulic motor cardan shaft large eccentricity distance fully, and the bellows transmitting torque is very capable, can overload operation, stress apart from fatigue ruption is far apart, thereby can improve operating life greatly.The utility model all can satisfy its transmission requirement well to the curved drilling tool of the list in the helicoid hydraulic motor, two curved drilling tool and general drilling tool, and can use in other similar products.

Accompanying drawing is a longitudinal sectional view of the present utility model, shows its overall structure.

In the embodiment that accompanying drawing provides, left and right two half-couplinves of the present utility model (1), (9) relative end have pod, and a ball (7) that is used to bear axial pressure is housed in the pod.Be connected with three layers of bellows (8), (6), (5) between two half-couplinves, the end face of right half-coupling (9) is stepped, promptly have three steps, left side half-coupling (1) circumferentially be fixed with two annular cushion blocks (2), (3), annular cushion block (2), (3) are fixed on left half-coupling (1) circumferentially by straight pin (4), and weld together successively.The two ends of the bellows of innermost layer (8) are welded on respectively on the circumferential surface of two half-couplinves (1), (9), and an end of second and third layer bellows (6), (5) is welded on cushion block (2), (3), and end is welded on right half-coupling (9) the step circumferential surface in addition.Bellows can or have the seam welding pipe through special processing and fabricating by the weldless tube of alloyed steel or stainless steel material, and its sectional shape can be waveform, also can be rectangle or triangle certainly.Torque that the wall thickness of bellows and the number of plies can be transmitted as required and bulk decision.On two half-couplinves (1), (5), have axial through hole, can locate to inject lubricant oil to ball (7).

Claims (3)

1, a kind of helicoid hydraulic motor cardan shaft shaft coupling has left and right two half-couplinves (1), (9), it is characterized in that: two half-couplinves are equipped with ball (7) between the relative end, are connected with one deck bellows (8) at least between two half-couplinves.

2, helicoid hydraulic motor cardan shaft shaft coupling according to claim 1, it is characterized in that being connected with between two half-couplinves two-layer above bellows, the end face of one of them half-coupling (9) is stepped, second half shaft coupling (1) circumferentially be fixed with annular cushion block, the two ends of the bellows of innermost layer (8) are welded on respectively on two half-couplinves, one end of all the other bellowss (6), (5) is welded on cushion block (2), (3), and end is welded on second half shaft coupling (9) in addition.

3, helicoid hydraulic motor cardan shaft shaft coupling according to claim 1 is characterized in that having axial through hole on two half-couplinves (1), (5).