FR2509816A1 - UNIVERSAL JOINT - Google Patents

Abstract

CARDAN GASKET WHOSE ASSEMBLY AND DISMANTLING CONDITIONS ARE SIGNIFICANTLY IMPROVED COMPARED TO THOSE OF CLASSIC ACHIEVEMENTS. THE EYES 3 OF THE FORK ARMS 6, SERVING AS A HOUSING FOR THE NEEDLE BEARINGS 4 FOR THE ASSEMBLY OF THE CROSSBODY 2, HAVE ON THEIR EXTERNAL PART A BLEED 9, OF AN AXIAL LENGTH SUCH AS A TRANSLATION OF THE CROSSBODY 2 ALLOWS THE PUSHING OF THE NEEDLE CUSHION 4 OUTSIDE THE EYE 3. THE INVENTION AVOIDS THE USE OF TIGHTENING MEANS FOR THE EXTRACTION OF THE CUSHIONS OUT OF THE EYES AND THEREFORE A FREQUENT CAUSE OF DAMAGE TO THE CUSHIONS. IT IS ALSO POSSIBLE, WHEN FITTING THE CARDAN GASKET, TO FIX THE BUSHING ON THE TRUNK IN A WAY TO AVOID TILTING OF THE NEEDLES.

Description

2 509816

  The present invention relates to a cardan joint constituted by two forks, connected by a spider and whose arms have eyes which serve as housing for needle bearings for mounting the spigot journals and have an adjustment surface for the bearings with needles and, on the outer surface of the arms, a groove of greater diameter than that of the adjustment surface and an annular groove for housing

  an axial stop ring of the needle bearings.

  He is known to facilitate the editing to achieve the part

  the outer eyes of the fork, behind the bleeding, with a dia-

  greater than that of the needle bearing adjustment surface (French Patent No. 1,497,512) The outer portion of the needle bearing is simultaneously made with a diameter smaller than that of the adjustment surface, in order to avoid any

  deterioration of the latter during assembly or disassembly.

  A disadvantage of the embodiment described, however, lies in the fact that the clamping zone of the needle bearing, having a smaller diameter, is very axially limited, so that a secure attachment of the bearing by means of a clamping tool as

  that a vice is possible only within certain limits only the

  ceptation of excessive rotation diameter of the universal joint

  would also make it possible to completely drive off the needle pads

  the adjustment surface by a unilateral translation of the spider The assembly and disassembly of such a cardan joint are

  extremely difficult because it is impossible to insert the

  lon of the brace enough in the eye of the fork so that the needle bearing to be mounted engages enough on the trunnion,

  before reaching the adjustment surface, to maintain without

  These difficulties are even more important when it comes to replacing a universal joint on a line of articulated shafts. The invention relates to a cardan joint whose bearings

  needles can be completely pushed back from the surface of

  by translation of the spider towards the bearing considered

  partial extraction of the needle pad from the adjustment surface

  the use of clamping tools must also be useless in

  the case of the universal joint according to the invention.

  According to an essential characteristic of the invention: a) the groove is machined inwards, on the annular groove of the axial stop ring; b) the adjustment surface of the eye of the arm substantially surrounds the pad in the vicinity of the needles; and c) the spider is movable in the eye of the arm, from its mounting position, over a length equal to or greater than

  the adjustment surface of the needle bearings.

  The cardan joint according to the invention has the advantage that it is possible to sufficiently introduce the spider into the eye of the arm so that the needles of the pad engage on the spigot of the spider before reaching the surface of the spider. fit A tilting of the needles in the pads during assembly, which would impose a

  realignment expensive needles, is avoided with certainty.

  Another advantage lies in the fact that by

  lon of the center of the joint, using a mandrel and a hammer, allows to extract the needle bearings without using tools of

  clamping deteriorating the surfaces of these pads.

  The construction provisions of the instruction permit simple assembly and disassembly, including inserted cardan joints

  in lines of articulated trees.

  According to another characteristic of the invention, the external diameter

  needle bearings has a smaller part of the

side opposite the cross.

  As a result of this provision, a longer length is

  available for the adjustment surface of the needle bearings without

  limitation of the advantages of the invention.

  Other features and advantages of the invention will be better

  understood using the detailed description below of an example

  embodiment and the accompanying drawings in which Figure 1 shows a fully assembled cardan joint; Figure 2 is the section of a fork arm with a needle bearing mounted; and Figure 3 shows a needle bearing pushed out of the

  adjustment surface of the eye of the arm, by translation of the spider.

  FIG. 1 shows a Cardan joint in which the two forks I and 1 'are connected by the crosspiece 2. The latter is mounted via needle bearings 4 in the eyes 3 of the fork arms 6, and locked in translation. axial by rings

axial stop 5.

  Figure 2 shows the needle bushing 4 in the mounting position, i.e., the adjustment surface 8 of the fork eye 3 substantially surrounds the bushing in the vicinity of the needles. fork arm 6 and the spider pins 2 is thus guaranteed in practical operation. Figure 3 shows how the needle pad 4 has been

  pushed out of the adjustment surface 8 by translation of the cross

  groove 2 The smaller zone 11 provided on the inner side of the neck

  sinet needle 4 allows to extend the adjustment surface 8 without increasing the stroke necessary to push the needle pad 4 out of the adjustment surface 8 of the eye 3 arm

  by axial translation of the spider 2.

  For the mounting of the universal joint, the needle bearing 4 is fixed on the pin as shown in Figure 3 The needles are thus protected against tilting during fitting

needle bearing 4.

  Of course, various modifications may be made by those skilled in the art to the principle or devices which have just been described as non-limiting examples, without

depart from the scope of the invention.

Z 509816

Claims (2)

claims   1 Cardan joint consisting of two forks, connected by a cross   furrow and whose arms have eyes that serve as housing   needle bearings for mounting the crank journals   groove and have an adjustment surface for the needle bearings and, on the outer face of the arms, a diameter groove   greater than that of the adjustment surface, as well as an annular groove   for the housing of an axial stop ring of the needle bearings, said seal being characterized in that:   a) the groove (9) is machined inwards, on the annular groove   the eye of the axial stop ring (5);   b) the adjustment surface (8) of the eye (3) of the arm substantially surrounds   cushion (4) in the vicinity of the needles; and c) the spider (2) is movable in the eye (3) of the arm from its mounting position and over a length equal to or greater than that of the fitting surface (8) of the needle bearings ( 4). Cardan joint according to Claim 1, characterized in that the outer diameter of the needle bearings (4) is   part (11) less wide side opposite the spider.