FR2508996A1 - Hinged joint of screw-type planetary hydraulic borehole machine - has half-couplings embraced by elastic sleeves resting with one end against end of internal gear rim of casing - Google Patents

Abstract

The hinged joint of a borehole screw-type hydraulic machine consists of two universal joints, each with a body in which an internal gear rim is in engagement with the two external gear rims on the two half-couplings. Each half-coupling is sealed by an elastic sleeve which rests with one end against the end of the internal gear rim, and is fixed with the other end on the half-coupling. Such a seal has a simple design, but ensures by its high sealing efficiency a long service life of the hinged joint.

Description

The present invention relates to mechanical constructions, in

  especially drilling equipment

  holes in the ground, and in particular relates to an arti-

  culation in particular for a hydraulic planetary pruning or bottom machine allowing the effort to be transferred between trees arranged at an angle

  variable during their operation.

  The joint in question can be used in particular for coupling the shaft of a hydraulic planetary size or helical bottom motor with

  the tree prot-nt ^ N attacking organ.

  It is possible to use the articulation according to the invention in other branches of the technique where the problem arises of the transmission of a force between shafts arranged at a variable angle during operation, for example in the chemical industry if this joint works in

aggressive environments.

  We know a machine articulation of hydraulic planetary helical size with two seals

  universal interconnected by a tree.

  Each universal joint includes a cylindrical body on

  the inner wall of which is made a toothed crown.

  This body shelters two half-sleeves arranged coaxially and at the ends of which are executed crowns

  toothed meshes with the toothed crown of the body.

  In the middle of the end faces of the oriented half-sleeves

  towards each other, there are provided hemispheres

  vant a ball joint whose radius is less than that of the hemispheres by a value proportional to the angle of

  pivoting of the half-sleeve relative to the body of the seal.

  Said body is closed on each side by a cover, mounted in said body by threaded assembly The space between the toothed rings of the half-sleeves and of the body is

  , filled with a lubricant and isolated by seals-

  ity placed in the body between the covers and the faces of the ring gear of said body Each of said seals

  sealing is executed in the form of a rubber ring-

  rehouc mounted with hard adjustment of its external surface

  cylindrical in the joint body, and its internal surface

  against the half-sleeve Rigid rings (metal-

  liques) are placed on both sides of said ring, on its flat faces; one of these rings is supported on the toothed crown of the body, while the other is in contact with the inner face of the cover To allow the left-hand side Is necessary necessary of the half-sleeve relative to the body of the Joint during its operation , some clearance is provided against the inside diameter and the

diameter of the half-sleeve.

  Under the action of the load of variable sign r 4-sltant movements of precession (oscillatory), occurs a displacement of the surfaces in contact with the ring in

  rubber and half sleeve, which causes deformation

  additional unilateral rubber rings.

  The irregular deformation of the rubber rings allows the mud to enter the clearance between them and the half-sleeve, to reach the enclosure of the seal and

  wash off the lubricant.

  In addition, in the joint used in a size engine for drilling oil and gas wells, the high temperatures acting at the bottom of the well cause a volume expansion of the lubricant and its expulsion from the internal enclosure of the seal. the rise of the engine and the decrease in temperature, the clearances of the

  seal fill-up with drilling mud.

  The decrease in the quantity of lubricant and the presence

  this drilling mud in the enclosure of the universal joint cv- ents rapid wear of the teeth of the crowns

  half sleeves and teeth of the crown of the body

  during the transmission of engine torque.

  We therefore proposed to develop a joint

  N for a planetary hydraulic helical-size machine in which the seal would be relatively simple in design while allowing

  considerably longevity of the joint in comparison

because of known joints.

  The problem thus posed is resolved using an

  culation, in particular for a hydraulic planetary heli-cold cutting machine, of the type comprising two universal joints coupled together and each of which comprises a body provided with a toothed crown produced on its inner wall, and closed on each side by a cover, two half-sleeves arranged coaxially in said body and provided with external toothed crowns in engagement with the toothed crown of said body, a ball joint

  placed between the said del-anc Sounds and two sealing joints

  sheath mounted in said body, between said covers and the corresponding faces of the ring gear of said body, characterized, according to the invention, in that each seal is made of elastic material in the form of a sleeve embracing the half sleeve and one end of which bears on the face of the toothed crown of the body, while its other end is fixed on the half-sleeve. It is advantageous to provide at one end of the

  socket a ledge and place a shoemaker in the body.

  annular embracing said edge of the sleeve.

  Such an embodiment of the end of the socket, as well as the fact that it is in a case

  ring allow to raise the reliability of the function-

  of the gasket where it is located

  contact with the body of the articulated joint.

  It is no less advantageous that the said rim of the sleeve is formed by several layers of different hardness, decreasing as the surface of the layer which comes into contact with 2 c 4 Pe

  the face of the toothed crown of the body.

  The axially variable hardness of the layers of the rim of the sleeve guarantees watertightness between the body

  and the outer cylindrical surface of the rim of the sleeve.

  The construction of the articulation of the hydraulic planetary helical cutting machine, executed in accordance with the present invention, is relatively simple, reliable in use, and is characterized by a relatively long service life.

  The realization of the 'anointed tooth nc: éié elas material-

  tick in the form of a socket keeps the lubricant in the Universal Joint enclosure and protects

  this enclosure against the penetration of drilling mud.

  During the operation of the joint, the contact surfaces of the sleeve do not move relative to the half-sleeve and, therefore, there is no additional deformation of the sleeve, which reduces the wear of the seal. tightness, améior téchéit 4 of 'The inner enclosure of the Universal Joint and, therefore, increases

  the service life of the entire joint.

  The invention will be better understood and other objects, details and advantages thereof will appear better on

  light of the explanatory description which follows

  of various embodiments given solely by way of nonlimiting examples, with reference to the attached nonlimiting drawings in which: FIG. 1 represents a joint for a hydraulic planetary helical cutting machine, viewed in longitudinal section along one of the joints universal; Figure 2 is a view along arrow "A" of Figure 1; Figure 3 shows a universal joint in which the flanged end is placed in an annular housing; Figure 4 shows a universal joint in which

  said rim is constituted by ri eues layers.

  The articulation of the hydraulic planetary helical cutter has two universal joints

  1 and 2 (Figure 1), linked together by a shaft 3.

  , The two universal joints are identical and, for

  this reason, in the description that follows, everything

  which will be said of one of them will be valid also for the other. The universal joint 1 comprises a cylindrical body 4 on the inner wall of which a toothed crown is executed 45 In the body 4, half-sleeves 6 and 7 are arranged coaxially having cylindrical and conical parts Toothed crowns 8 and 9 are executed on the respective ends of the cylindrical parts of the half-sleeves 6, 7 oriented 1 lme towards each other Half-spherical cavities are provided in the end faces of these half-sleeves to place a ball joint 10 The diameter of the ball joint 10 is somewhat less than the diameter of the semi-spherical cavity by a value proportional to the angle of rotation of the half-sleeve 6, 7 relative to the body 4

u j oi Ln t.

  The body 4 is formed on each side by a cover 11 screwed into the body 4 Plates 12 engaged in grooves of the cover 11 and of the body 4 pocket the cover 11 to rotate The plate 12 is fixed to the cover 11 by screws 13 ( Figure 2) The screws 13 are immobilized in rotation by a plate 14 folded towards one of the sides

of screw 13.

  To increase the reliability of the operation of each

  Universal joint jon fills its internal cavity with a lubricant

  around the ball 10 (Figure 1) between the body 4 and two half-sleeves 6 and 7 so that the active surfaces of the toothed rings 5, 8 and 9 of the body 4 and

  half sleeves 6 and 7, respectively, operate constantly

  in a medium of lubricating material.

  In the body 4, between the covers 11 and the corresponding face of the ring gear 5 of the body 4, are

  sealing gaskets 15 Each sealing gasket-

  ity 15 includes a socket 16 made of elastic material

  and embracing the cylindrical part of the half-sleeve 6 (7).

  The end of the sleeve 16 which is oriented towards the toothed crown 5 of the body 4, is produced so as to bear on the lace of said toothed crown For this purpose, this end has a flange 16 a and is supported on a metal ring 17 placed between the socket

  16 and the face of the toothed crown 5.

  The other end of the sleeve 16 is fixed to the end of the deimirmanchon 6 (7) projecting beyond the cover 11, using a collar 18, a screw 19

(Figure 2) and a nut 20.

  Figure 3 shows a seal 21 in which one end of the sleeve 22 is provided with a

  rim 23 and is housed in an annular housing 24 pos-

  appealing to a contoured interior surface in a way

  appropriate and embracing this end of the socket 22.

  The end of the sleeve 22 is supported by its rim 23, by lin r 9 éaaire Attabe zague 25, on the face of the

gear 5.

  The ring 25 can be freely mounted or be

assembled to the socket 22.

  The housing 24 and the ring 25 are executed in one

  more rigid material than that of the socket 22.

  A sealing ring 26 is placed between the body 4

and the flat face of the ring 25.

  It is possible to produce the rim 27 (FIG. 4) of the socket 28 in layers of different hardness, decreasing as one moves away from its face which is in contact with the face of the toothed crown of the body 4. The sleeve 28 is fixed to the cylindrical part of the half-sleeve 6 using two rings 29 and 30 arranged in contact with each other along their conical surfaces. The ring 29 is split and its outer surface. is conical The ring 30 executed in one piece with an internal cone is arranged on the conical outer surface of the ring 29, the diameter of which then decreases by compressing the sleeve 28 on the half-sleeve 6 The value of the conicity is chosen conical surfaces of the rings 29 and 30 so as to prevent

  spontaneous uncoupling of the rings during operation-

universal joint.

  The articulation of the helical cutting machine

  hydraulic planetary works as follows.

  The half-sleeves 6, 7 of the universal joints 1, 2 are

25039 C

  assembled by their conical parts respectively to the motor rotor (not shown) and to the shaft carrying a

  attack organ (not shown).

  The engine torque and the axial force component of the rotor are transmitted via the Marble joint carrying the operatoize member and placed eccentrically to the rotor Under these conditions, the axes of the half sleeves 6 and 7 of each Universal joint

  1 and 2 intersect, while the half-sleeves 6 and 7 themselves

  same perform oscillatory movements with respect

  to body 4 of each Universal Joint.

  LN engine torque is transmitted from the rotor to the shaft of the operating member via the conical parts of the half-sleeves 6, 7, as well as by means of the toothed rings 8, 9 and 5 of the half-sleeves 6 and 7 and the body 4, respectively, of each of the universal joints 1 and 2 The axial load of the rotor is transmitted by the same conical parts of the half-sleeves 6, 7 and by the ball joint 10, via the corresponding surfaces of the cavities semi-spherical half sleeves 6 'and 7

  finding in contact with said ball joint disposed between them.

  The seal executed in elastic material in the form of a sleeve 16 whose ends are fixed in the body 4 and on the half-sleeves 6, 7 ensures the maintenance of the lubricant in the cavity of the universal joint

  1 (2) and protects its inner enclosure from penetration

tion of drilling mud.

  This is obtained from the fact that, during the operation of the joint, the contact surfaces of the sleeve 16 do not move relative to the half-sleeves 6 (7) and to the body, since the external surface of the sleeve 16 on the 'one of its ends is arranged at a Just hard in said body and is fixed there, while the inner surface

  from the other end of the socket 16 applies intimately

  against the half-sleeves 6, 7 and is fixed on their surface The elastic material of the sleeve 16 allows the half-sleeves 6 and 7 to move freely 208996 o

  oscillatory with respect to the body 4.

  The presence of the profiled rim 23 provided at the end of the sleeve 22 placed in the body 4, as well as of the bowl r 24 with an appropriate profiled surface embracing the rim 23, increases the reliability of the operation of the seal. The use of a socket 28 with flange 27 in several

  layers of different hardness simplifies mounting

  age of the universal joint without reducing the working capacity

  , and the reliability of the assembly of said joint.

I 1 -

R E VE N D 1 C A T I O N S

  1 Joint for a hydraulic planetary helical baiile machine, of the type comprising two uni-Lversel seals (1,2) coupled together and each of which comprises a body (4) with a toothed crown (5) executed on its inner wall, closed at each end by a

  cover (11), two half-sleeves (6,7) arranged coaxially-

  ment in the body (4) and each provided with an external toothed crown (8,9) engaged with the toothed crown (5) of the

  body (4), a ball joint (10) placed between said half

  anc ons, and two seals 15, 21) mounted in the body (4) between the covers (11) and the corresponding faces of the ring gear (5) of the body (4), characterized in that each seal d the seal (15, 21) is made of an elastic material and is in the form of a sleeve (16, 22, 28) embracing the half-sleeve (6, 7), one end of said sleeve being adapted so as to bear on the face of the toothed crown (5) of the body (4), while its other end is fixed

on the half-sleeve (6,7).

  2 Joint according to claim 1, characterized in that one end of the sleeve (22) is provided with a flange (23) and that an annular housing (24) is mounted in the body (4) and embraces the ledge (23)

of the socket (2 2).

  3 Joint according to claim 1, charac-

  terized in that one end of the sleeve (28) is provided with a flange (27) made up of several layers whose respective hardnesses decrease as one moves away from that of the surfaces of the flange (27) which is in contact with the face of the ring gear (5) of the body (4).