FR2619879A1 - ARTICULATED SHAFT MOUNTING DEVICE - Google Patents

Abstract

To integrate an articulated shaft into a mechanism (a gearbox) or an intermediate bearing, a shaft end 1 which is journalled in the nose of the mechanism or in the intermediate bearing forms at the same time, retaining the same section, the inner part of an articulated joint intended for small bending angles.

Description

The invention relates to a device for

  articulated shaft stage comprising a combined articulated joint

  born to a mechanism. The invention further relates to a dis-

  positive articulated shaft assembly comprising an articulated joint combined with an intermediate bearing. The aforementioned mechanism can be constituted, as well by a reducer or a gearbox to which or to which follows

  a longitudinal transmission shaft only by a different

  rentiel ended with half-shafts of wheels.

  0 We already know devices of the kind cited

  higher in extremely di- verse embodiments

  verses and, in particular, we have already described different

  forms of integration of articulated joint components

  strips, or complete articulated joints, in a mechanism.

  For example, we already know from the fact AT-A-284 644 a

  differential in which the ends of the shafts are secured

  res of internal elements of articulated joints and o the corresponding external elements of articulated joints

  consist of output wheels of the differential

G tiel.

  The object of the invention is to produce devices for mounting articulated shafts of the kind mentioned above which are of a simplified construction and

  in which we can dispense, at least partially-

  ment, in particular screw or socket connections

  which are necessary in the solutions already

  naked, and in which it is possible to perform a

simple axial mounting.

  In particular, the aim is to propose, for 0 devices for mounting articulated shafts with a low bending angle, a solution presenting a reduced cost and weight. The solution provided according to the invention for a

  articulated shaft mounting device combined with a mechanism

  nism consists in the fact that a shaft end which emerges from the mechanism constitutes an inner element of the articulated joint which has axial ball raceways whose median axes are parallel to the axis of the shaft end and in that the external element of the articulated joint also has axial ball raceways whose median axes "are parallel to

the axis of this element.

  In an articulated shaft mounting device combined with an intermediate bearing of the articulated shaft, the solution according to the invention consists in that one end

  shaft held in the intermediate bearing forms an

  inside of the articulated joint which has

  mins of axial ball bearing whose median axes are parallel to the axis of this element and that

  the outer element of the seal also has

  mins of rolling of axial balls with median axes

  are parallel to the axis of this element.

  In this way, a simple solution is achieved according to the invention in terms of construction, which allows simple assembly by axial interlocking, and satisfactory constant velocity properties are obtained.

  for small bending angles. The roadways

  ment of balls provided in the inner element of the seal are formed on the straight end of the shaft end and can be produced in an uncomplicated mode in terms of the manufacturing technique, and provision is made

  preferably articulated joint elements which have

  tooth five ball raceways. The length re-

  laterally large ball bearings as-

  on the compensation of the axial play, so that a second

  me articulated joint possibly necessary may be

  produced in the form of a fixed articulated joint.

  To keep the balls substantially in one plane - in order to give the articulated joint properties close to those of constant velocity joints - it is preferable to provide on the external element of the joint

  axial stops with small spacing and / or mounting an element

  cage type that holds the balls in a roll

  and can at the same time serve as an auxiliary means of

  during the interlocking assembly.

  According to a preferred configuration, for the two variants of the solution according to the invention, the section of the shaft end which constitutes the internal element of the

  seal is widened behind the seal

  boot maker or behind the bearing support, ma-

  to form an axial stop. The exterior element

  O joint of the joint, is generally followed by a hollow hollow shaft, the external element of the joint Must be

  provided with a bottom or which can on the contrary present the form

me of an open tubular body ..

  In the case of an articulated shaft mounting device equipped with an intermediate bearing, according to a pre-

  advantageous embodiment, the integrated element

  laughter of the joint which constitutes a shaft end is extended

  qe beyond the contact region of the balls, in the

  meaning which moves away from the bearing region. According to another

  O ur advantageous embodiment, the external element

  laughter of the joint can be provided extended beyond the re-

  ball contact region, towards the bearing region.

  These two measures are aimed at achieving better

  their mass balance with respect to the contact plane of the balls, in order to make the articulated shaft less sensitive to radial vibrations. The extension of the shaft end of the type mentioned above can in particular be

  narrowed in a cone, so as not to cause a decrease

  tion of the allowable bending angle of the joint.

  O The intermediate bearing can be fitted on the shaft end in the usual way and, for its part,

  it can be suspended from a frame, in particular from a chas-

  on the vehicle, by a flexible suspension.

  In a simplified and par-

  Particularly advantageous, a ball bearing of the intermediate bearing can also be provided directly on the shaft end, so that the shaft end forms at the same time the inner ring or the inner element of the bearing. We then obtain a reduction in diameter

and a reduction in mass.

  Embodiments of the articulated joint which are particularly well suited for the subject of the aforementioned invention are already described in P 37 10

  78.3. Other features and advantages of the invention

  tion will be better understood on reading the description

  which will follow from some examples of preferred embodiment

  res with reference to the appended drawings in which, FIG. 1 represents an articulated shaft mounting device attached to a gear mechanism in a first embodiment (FIG. 1); Figure 2 shows an articulated shaft mounting device attached to a gear mechanism in a second embodiment (Figure 4); Figure 3 shows an articulated shaft mounting device equipped with an intermediate bearing in a first embodiment (Figure 2); FIG. 4 represents an articulated shaft mounting device equipped with an intermediate bearing in

  a second embodiment (Figure 3).

  The elements of the different figures which cor-

  correspond to each other are designated by the same numbers

reference ros.

  In Figure 1, there is shown a piece of ar-

  bre 1 which emerges from a mechanism nose 2 and is mounted with a seal relative to the latter using a seal 3. At the end of the shaft end

  1, are formed, without changing the diameter, of the

  mins of rolling of axial balls 4 whose axes

  dans are parallel to the axis of the tree and in the

  which in particular five balls 5 are mounted distributed over

  the periphery and movable in axial translation. The bil-

  the 5 are retained in the same plan, by an an-

  ring 6 having the shape of a cock, and which is engaged in an internal groove 7 of the external element

  7 of the seal, with the possibility of axial translation.

  The outer element of the seal has raceways

  Lement 9 axial balls whose median axes are pa-

  parallel to the axis of the seal element and in which the balls 5 are also movable in axial translation, the translation stroke being limited by axial stops. In the inward direction of

  the external element 8 of the seal, are provided with first

  res axial stops 10 which are formed directly in the outer element of the seal. In the opposite direction, that is to say going towards the outside of the seal, second axial stops 11 are housed in the external element 8 of the seal, the different stops 11 preferably being able to be assembled together to form a ring. The articulated joint is enclosed with a sealed joint by means of a rolling bellows 12 which is connected to the element

  outside 8 of the joint by a t8le sleeve 13 and is

  pledged in an annular groove 14 of the shaft end 1 immo-

  mobilized in this groove by means of a clamp

  15. The external element 8 of the articulated joint is connected

  opposite to mechanism 2, a tubular shaft 16

die on this item.

  In Figure 2, an articulated tree is reproduced

  in an embodiment which corresponds to the

  qure 1; a notable difference is that the ele-

  outer seal 8 of the seal present, opposite the ar-

  tubular bre 16 which follows it, and beyond the re-

  ball contact piece, a massive annular extension

  sif 17 which is intended to ensure an improvement in the distribution of the masses in the external element of the seal, with respect to the radial oscillations. The sheet metal sleeve 13 and the rolling bellows 12 are adapted

  way which corresponds to this extension 17.

  In Figure 3, there is shown a device

  of articulated shaft in combination with a Pa-

  binder elastic intermediate 18 which comprises an outer metal sleeve 19 and is connected internally to a bearing ring 20, which has an outer ball race, while an inner ball bearing groove 21 intended to receive the balls 22 bearing is formed directly in the shaft end 1, by turning. At the free end of the

  end of shaft 1, here are also provided roadways

  Lement of balls 4 intended to receive balls 5 re-

  parts on the circumference and capable of sliding axially. The external element 8 of the seal is constituted in this case by a short annular element having

  ball raceways 9 and which are followed by

  te of the first axial stops 10 which are formed in

  a tube connection element while second-

  my axial stops 11 are provided in the form of a sheet metal tank. The external element 8 of the seal, the tube connection element 20 and the sheet metal ring 11 are tightened against each other by means of a sheet metal sleeve 13 which at the same time serves to fix a rolling bellows 12. The latter is engaged by its opposite end in

  an annular groove 14 of the shaft end la and it is immo-

  mobilized in this groove by means of a stop ring 23.

  The open tubular connection element is followed by a light hollow shaft 16 welded to this element. On the other side, the end of the tree is also assembled to a tree

tubular 24.

  In FIG. 4, a device for mounting an articulated shaft combined with a

  intermediate bearing in an analogous embodiment

  than that of Figure 3; the essential difference is that the end of the shaft is fitted, i the opposite

  from the intermediate level, and beyond the region of con-

  tact of the balls, of a conical extension 25 in the-

  which ball raceways are extended, For mounting reasons. The tree bc t section

  is shown in addition with the corre-non- balls

  dantes. Of course, various modifications may be made by those skilled in the art to the devices which have just been described solely by way of non-illustrative examples.

  limiting without departing from the scope of the invention.

R E V E N D I C AT I O N S

  1 - Articulated shaft mounting device

  taking an articulated joint combined with a mechanism, character-

  terized in that a piece of tree (1) which emerges from the mechanism

  nism (2) forms an inner element of the articulated joint, which has axial ball raceways (4) whose central axes are parallel to the axis of the shaft end and in that the outer element (8) of

  articulated joint also has rolling paths

  ment of axial balls (9) whose median axes are

  parallel to the axis of this element.

  2 - Device according to claim 1, charac-

  terized in that the section of the shaft end ends, in the part which is provided with ball raceways (9) retaining the same diameter as the part

full.

  3 - Device according to claim 1 or claim 2, characterized in that, inside the mechanism (2), the section of the shaft end has an enlargement of diameter used for immobilization

in the axial direction.

  4 - Device for mounting an articulated shaft

  taking a combined articulated joint & an intermediate bearing

  diary, characterized in that a shaft end (1) held

  in the intermediate bearing (18) forms an integrated element

  hinged joint laughter which has roadways

  Lement of axial balls (4) whose median axes are

  parallel to the axis of this element, and in that the element

  outer seal (8) of the seal also has

  axial ball bearing mins (9) whose axes are

  dians are parallel to the axis of this element.

  - Device according to claim 4, characterized in that the section of the shaft end passes from the solid part to the part provided with the raceways

  balls (9) keeping the same diameter.

  6 - Device according to one of claims 4

  and 5, characterized in that the section of the shaft end

  has an enlarged diameter behind the pa-

  link intermediate (18) to ensure axial locking.

  7 - Device according to one of claims 1

  6, characterized in that the external element (8) of the seal has axial raceways (9) whose median axes are parallel to the axis of this seal element, the length of these raceways being less than LO to that of ball raceways

  (4) provided in the shaft end (1).

  8 - Device according to claim 7, charac-

  characterized in that the external element (8) of the articulated joint

it is in several parts.

  L5 9 - Device according to one of claims 7

  and 8, characterized in that at least one of the stops (10)

  is mounted in each of the bil-

  the (9) formed in the outer element (8) of the seal.

  - Device according to one of claims 7

  to 9, characterized in that a tubular shaft (16) is

  welded to the outer element (8) of the seal.

  11 - Device according to one of claims 1

  to 10, characterized in that the shaft end (1) is pro-

  skirted beyond the contact region of the balls, in

  the direction that moves away from the bearing region.

  12 - Device according to claim 11, ce-

  characterized in that the extension (17) of the shaft end

  (1) tapers to a cone to enlarge the angle of the

xion.

  13 - Device according to one of claims i

  to 12, characterized in that the external element (8) of the seal is extended beyond the contact region of the

balls, towards the bearing region.

  14 - Device according to one of claims 1

  to 13, characterized by an auxiliary mounting means in

  form of cage which fixes the balls (5) on the end of

  bre or in the outer element (8) of the seal.