FR2619606A1 - CROSS-ROLLING BEARING AND METHOD FOR MANUFACTURING THE BEARING - Google Patents

Abstract

This crossed rolling element bearing comprises an outer ring 1 having an inner V groove and an inner ring 4 having an outer V groove which faces the inner V groove of the outer ring, and rolling elements (for example rollers) mounted between the two grooves. For mounting the rolling elements, the outer ring is broken by exerting pressure by means of a press on a notch 12 to form perfectly complementary radial seal faces. After mounting the rolling elements, these seal faces 8a, 8b are connected exactly to one another, so that all the faces of the outer ring and of its groove remain perfectly circular. Use in particular in industrial robots.

Description

CROSS-ROLLING BEARING AND METHOD OF

FABRICATION OF THIS BEARING

  The present invention relates to a rolling element rolling bearing of the type frequently used in the oscillating, articulated or rotating parts of manipulators of industrial robots, as well as in medical devices, and to a manufacturing method.

  of this rolling element bearing crossed.

  In rolling element bearings crossed

  in the art, such as that shown in the

  6, an outer ring 1 is provided on its circumference.

  2, an inner V-shaped groove 3 which extends in the circumferential direction and opens inwards, and the inner ring 4 is provided,

  on its outer circumference 5, an outer groove

  re in V 6 which extends in the circumferential direction-

  the outer ring 1 is composed of two elements la and lb which are separated along the line 3c forming the bottom of the

  the V-shaped internal groove 3. For the assembly of the

  With crossed-wheel elements, rolling elements 7, such as cylindrical rollers or balls, as well as retaining members / spacers, not shown, are placed between the outer V-shaped groove 6 of the inner ring 4 and one , the or lb_, elements of the outer ring. Then, place the other element, lb or la, of the outer ring between the inner ring

  4 and the first element, la or lb, of the outer ring

  re. These paired elements la and lb of the outer ring

  re adapt to one another at their complementary faces 8a and 8b and are fixed by means of screws

9a and nuts 9b.

  However, in the rolling element bearing

  crossed in this way, and in accordance with the

  than before, the paired elements la and lb which com-

  the outer ring 1, are machined separately from each other. This requires machining separately the complementary faces 8a and 8b which must be applied to one another for assembly. It is very difficult to machine the complementary faces 8a and 8b, by separate operations, with a precision sufficient for them to marry exactly. If this machining is possible, its cost is very high. In addition,

  the rolling faces 3a and 3b, which form the internal groove

  V-shaped head 3 on which the rolling elements roll-

  must be machined after having been temporarily

  assembled at the complementary faces 8a and 8b. If these complementary faces 8a and 8b are not finished accurately, the rolling faces 3a and 3b can not be machined accurately. This poses a

  problem, which is that the oscillatory movements

  relative allowance as the inner and outer rings

  1 and 4 will describe through the rolling elements

  7, can not be done in a uniform and precise way. If, in addition, the two complementary faces 8a and 8b and the rolling faces 3a and 3b which form the V-shaped internal groove 3 are machined with precision, the

  paired elements la and lb of the outer ring

  stall as soon as there is any loosening between

  the screws 9a and the nuts 9b, because there is a game

  each of the screws 9a which assemble the elements

  res la and lb of the outer ring and the hole of

  age of screw 10 & through which the corresponding screw 9a

  is threaded. It then establishes a centering defect in

  outer circumference and roll faces.

  3a and 3b which make up the V-shaped internal groove 3, as well as between the individual rolling faces 3a and 3b, which poses another problem residing in the difficulty of respecting the high precision, which makes

  Disappear the sweetness of swinging movements.

  In the prior art, the manufacturing process

  Cross-rolling element rolling requires a number of phases which include: (1) phase

  consisting of rough machining of

  res la and lb which make up the outer ring 1; (2) the quenching and tempering phase of the individual elements

  la and lb of the outer ring; (3) the phase of rectification

  application of the complementary faces 8a and 8b; (4) the pha

  joining the complementary faces 8a and 8b, which serves to temporarily assemble the two elements la and lb of the outer ring by means of the screws 9a and nuts 9b, to grind the outer circumference of the outer ring 1; (5) the grinding phase of the rolling faces 3a and 3b that make up the V-shaped internal groove 3, in the temporary assembly state; (6) the removal phase of the screws 9a and the nuts 9b used for the temporary assembly, and assembly of

  rolling elements 7 and retaining elements

  its (not shown) between the inner circumference of one of the elements, the or lb, of the outer ring

  and the inner ring 4 in which the roll faces

  6a and 6b constituting the outer ring V 6 have been rectified; and (7) the assembly phase of the other

  element, lb or la, of the outer ring between the first

  first element, la or lb, of the outer ring and the base

  4, and fixing the paired elements la and lb of the outer ring by means of the screws 9a and

  nuts 9b. In addition, when the outer circumference

  upper and the lateral faces of the outer ring 1

  and the rolling faces 8a and 8b must be

  In the temporary assembly state, the paired elements 1a and 1b of the outer ring are offset relative to each other, which poses another problem that the elements 1a and 1b are

  difficult to rectify accurately.

  The present invention has therefore been designed to solve the aforementioned problems and, for this purpose, it aims to achieve a rolling-element rolling bearing in which, thanks to the formation of faces of

  radial joints in the outer ring, it is possible to

  precision machining the rolling surfaces of the rolling elements that make up the V-shaped internal groove

  and to avoid any shift in service between the circumference

  the outer groove and the V-shaped internal groove as well as

  be the individual rolling faces that make up the V-shaped internal groove.

  Another object of the present invention is to

  set up a process for manufacturing element bearings

crossed wheels.

  According to a first aspect, the subject of the invention is a cross-rolling oscillation rolling bearing comprising: an outer ring having an internal V-shaped groove formed in its inner circumference

  in order to extend in the circumferential direction

  and to open inwards; an inner ring

  having an outer V-shaped groove formed in its

  the outer conference so as to extend into the

  circumferential rection and to face the groove

  V-shaped outer ring; red elements

  lants adjusted between the V-shaped internal groove of the ring

  outer ring and the outer V-groove of the inner ring

  higher, characterized in that the outer ring is

  broken in an appropriate position to form

  these radial joints so that we can open it

  to the right of its radial joint faces.

  According to a second aspect, the invention is

  a method of manufacturing a crossed rolling element bearing, which comprises the steps of:

2619606

  forming a V-shaped inner groove in the inner circumference of an outer ring so that it extends in the circumferential direction and opens inwards; form a throat. V-shaped outer circumference of an inner ring

  in such a way that it extends in the direction

  conferring and facing the inner throat

  re V of the outer ring; and insert elements

  between the V-shaped internal groove and the outer groove

  V-shaped, characterized in that it comprises the steps of forming a radial cut in said

  outer ring, to break this outer ring into ex-

  an external force on said notch to form

  sea radial joint faces; and to open the said

  outside the right of these joint faces for

  put the rolling elements between the outer ring

inside and the inner ring.

  According to the invention, to form the seal faces by radial breaking of the outer ring, it forms

  firstly the radial cut in the outer ring

  re. It suffices that the direction in depth of this

  notch is oriented substantially in the direction

  of the outer ring, and the notch may extend

  the entire length of the joint line on which the joint faces are to be formed, or

  on a part of this length. However, it is pre-

  fable that the notch is formed in the inner circumference of the outer ring, where the concentration

  stresses occur when the outer ring is broken

  using a press or equivalent. Because the seal faces are break faces, the seal faces can meet by fitting exactly after the outer ring has been opened to the right side.

  joint faces to allow mounting of the red elements

  between the inner ring and the outer ring.

  Even if there is still a slight free space between the faces

  when the rolling element bearing crosses

  ses is not used the joint faces are perfectly

  complementary and marry each other in

  tegral, thus ensuring the circularity of the outer ring

  when the rolling element bearing crosses

  is mounted for use in a machine, by

  example in an oscillating element.

  Since the rolling element bearing

  crossed according to the invention is obtained by a simple case

  sure radial of the outer ring, the roll faces

  rolling elements, which make up the inner groove.

  the V-ring of the outer ring, can be

  with precision and they do not lose their precision.

  if we. In addition, since the joint faces are formed to be perfectly complementary, the

  outer ring can retain its circularity when

  that it is mounted in the machine, for example in the-

  said oscillating element, even if the radially

they are slightly spaced.

  On the other hand, in the manufacturing process of

  cross-element bearing according to the invention, the

  These rolling elements rolling, which form the inner V-groove of the outer ring, can be ground easily and accurately. In addition,

  the outer ring can be manufactured in a

  remarkably simple because it is not divided into

two parts.

  The invention will be described in detail in the following on the basis of embodiments of this invention and with reference to the accompanying drawings, in which: FIG. 1 is a top plan view showing a rolling element rolling bearing according to a first embodiment of the invention;

  FIG. 2 is a sectional view of the bearing

  shown in Figure 1; Figure 3 is a perspective view showing the relationship between the rolling elements and the retaining members / spacers to be mounted between the inner ring and the. outer ring; Figure 4 is a perspective view showing the outer ring of Figure 1;

  FIG. 5 is an enlarged view showing a

of the bearing of Figure 4; and

  FIG. 6 is a sectional view showing the wheelchair

  cross-linked elements of the ancient art of

TER AL.

  In Figures 1 to 3, there is shown a roll-

  crossed elements in a form of

  implementation of the invention. In this rolling element bearing, an outer ring 1 is provided on its inner circumference 2 with a V-shaped inner groove 3 which extends in the circumferential direction and which opens towards the inside. An inner ring 4 is

  provided, on its outer circumference 5, with an external groove

  V-shaped wall 6 extending in the circumferential direction

  and faces the V-shaped interior throat.

  rolling elements 7 are mounted between the V-shaped grooves

  outer and outer ring 3 and 6. The outer ring 1 and

  if formed, has radial joint faces 8a and 8b which are formed by breaking the outer ring 1 at a suitable point, so that it can be opened to the right of the joint faces 8a and 8b, in the direction of the arrows A as shown in the figure

  4. In this embodiment, the rolling elements

  7 which must be fitted between the outer ring

  1 and the inner ring 4 are assembled with retaining elements / spacers 11 (as shown in FIG.

  Figure 3), which prevents them from being oblique-

is lying.

  Further, in this embodiment, the seal faces 8a and 8b of the outer ring 1 are formed, as shown in FIGS. 4 and, exerting an external force, by means of a close - se, on a notch 12 which is formed in a ridge

  defined by the inner circumference 2 and the lateral face

  of the outer ring 1. In this way, the faces

  of joint 8a and 8b are break faces which are

  to marry each other perfectly.

  The method of manufacturing the crossed rolling element bearing of this embodiment comprises the successive steps of: (1) performing rough machining of the outer ring 1 provided with

  the inner groove V 3; (2) form the radial cut

  the 12 in the ridge defined by the inner circumference

  re 2 and the lateral face of the outer ring 1; (3) quenching and tempering the outer ring i; (4) grinding the outer circumference, the side faces and the rolling faces 3a and 3b which form

  the inner groove V 3; (5) apply the external force

  by means of a press to break the outer ring

  1, going from the side in which the cut 12

  is formed on the other side, along the axis of the

  the 12; and (6) open the outer ring 1 to the right of

  its broken joint faces 8a and 8b and mount the ele-

  rolling members 7 and the retaining members / spacers 11 in the space formed between the outer ring 1

and the inner ring 4.

  In this method of manufacturing a rolling element rolling bearing, when the outer ring 1 must be open to the right of its seal faces 8a and 8b to allow mounting of the rolling elements 7 and the retaining members / spacers 11 in the 'space

  between the outer ring 1 and inner ring 4, for example

  a suitable mounting device is

  the outer face of the inner ring 4 and

  it is used to mount the rolling elements 7 and the

  retaining ganes / spacers 11 in the outer V-shaped groove 6 of the inner ring 4. The outer ring 1 open in line with its seal faces 8a and 8b is

  subsequently mounted in this state. Then, remove the provision

  mounting device to leave the rolling elements 7 and the retaining members / spacers 11 between the ring

  outer 1 and the inner ring 4.

Claims (2)

R E V E N D I C A T IO N S   1 - Rolling element rolling oscillation comprising:   an outer ring (1) having an internal groove   V-shaped (3) formed in its inner circumference   re in order to extend in the circumferential direction and to open inwards;   an inner ring (4) having an external groove   V-shaped (6) formed in its outer circumference.   re (5) so as to extend in the circumferential direction   and - face the inner V-shaped groove (3) of the outer ring (1); and rolling elements (7) inserted between the throat   inside (3) of the outer ring (1) and the   outer V-shaped (6) of the inner ring (4); characterized in that said outer ring (1) is broken in a suitable position to form   radial joint faces (8a and 8b) so that   to open to the right of its radial joint faces.   2 - Method of manufacturing a rolling bearing   rolling parts, which includes the steps to:   form a V-shaped internal groove in the circumference   interior of an outer ring in such a way that   extends it in the circumferential direction and that opens it inwards;   form an external V-shaped groove in the circumference   outer ring of an inner ring so that   extends it in the circumferential direction and that   face the V-shaped internal groove of the outer ring térieure; and   insert rolling elements between the inner groove   upper V and outer V-groove;   characterized in that it comprises the steps   being able to form a radial cut in said base   outer ring, to break this outer ring into   an external force on said notch to form   radial joint faces, and to open the said   outside the right of these joint faces for   put the rolling elements between the outer ring inside and the inner ring.