FR2689586A1 - Fixed constant velocity joint. - Google Patents

Abstract

The aim of the invention is to provide a fixed constant velocity joint in which the cumulative error is reduced to a minimum by virtue of the fixing method comprising bearing inserts. This object is achieved thanks to the fact that the balls (8) are held without play in the outer raceways (15) and in the internal raceways (20), that on this occasion the ring (6), provided with 'at least two fingers (7) directed axially and radially towards the inside of the cavity of the outer seal part (1), and held in abutment, each between two outer raceways (15), against the spherical outer surface (4) of the cage (3), has an axial spacing (s) from a reference surface (21, 21a) located on the open side of the outer seal portion (1), and that the ring (6) is connected to the outer seal part (1) respecting a predetermined axial clearance with respect to the cage (3), the inner surfaces of the outer seal part (1), located between the outer raceways (15), being kept away from the spherical outer surface (4) of the cage (3).

Description

FIXED HOMOCINETIC JOINT.

  The invention relates to a fixed constant velocity joint comprising an external joint part made in the shape of a bell, having a cavity and comprising external raceways without undercut, evenly distributed on the periphery, an internal joint part comprising inner raceways corresponding to the outer raceways, as well as balls which are housed in the outer and inner raceways, which transmit the torque and which are held in the openings of a cage disposed between the outer joint part and the inner seal part, the inner surfaces of the outer seal part, located between the outer raceways, being produced without undercut, and the cage being stopped axially outward, by means of inserts d support associated with a ring

  and arranged between the outer raceways.

  It is known from document DE-PS 25 22 670 to effect the axial stop of the cage of a fixed constant velocity joint, by means of a support disc fixed on the external side of the part of outer seal The aim of this document is to allow easier mounting by the use of an outer seal part without undercut. The disadvantage of this described embodiment lies in the fact that the balls are affected by play in the raceways, and that only the axial play of the cage is adjustable. It is thus necessarily in the presence of play, a side between the inner seal part, the balls and the outer seal part, and on the other side between the inner seal part, the cage and the outer seal part. This results in two series game suites, of which only one of the game suites, namely the axial play between the cage and the outer joint part, can be adjusted according to FIG. 1 of the document which

has just been quoted.

  DE-PS 32 33 753 is also known, which already shows an inner surface of the outer seal part, partially offset by

  relative to the spherical outer surface of the cage.

  No measure, as for the adjustment of the play, is

  however provided for in this publication.

  Clearances only determined by manufacturing tolerances, which can add up in the most unfavorable cases, however favor a

significant wear of the seal.

  The object of the invention is to provide a fixed constant velocity joint in which the two sets of games mentioned are defined. At the same time, a simple assembly must be allowed, by axial fitting of the inner joint part to which is attached.

  the cage in which the balls are inserted.

  According to the invention, this object is achieved thanks to the fact that the balls are kept without play in the outer raceways and in the inner raceways, that on this occasion the ring, provided with at least two directed fingers axially and radially inward of the cavity of the outer seal part, and kept in abutment, each between two outer raceways, against the spherical outer surface of the cage, has an axial spacing (s) of a surface reference located on the open side of the outer seal part, and that the ring is connected to the outer seal part respecting a predetermined axial play * with respect to the cage, the inner surfaces of the outer seal part, located between the outer raceways, being kept away from the spherical outer surface

from the cage.

  The advantage of the embodiment in accordance with the invention lies in the fact that the ring comprising the fingers on which the cage rests, is connected to the outer seal part, in a position oriented relative to the cage. makes it possible to guarantee that all the cumulative errors establishing in the

attached, be eliminated.

  The presence of a clearance (s) when the balls are in bearing without clearance in the external and internal raceways, makes it possible to guarantee an adjustment

  perfect with a predetermined axial clearance.

  The configuration according to the invention, of a constant velocity joint, makes it possible to establish reports

  clearly defined for the games existing in the joint.

  The first game suite, outer joint part, balls, inner joint part, is set to zero, and the second game suite, outer joint part,

  cage, inner seal part is adjustable.

  Thus, the two game suites coming in

  account, are perfectly defined.

  According to an advantageous configuration of the invention, the fingers are arranged radially inwards from the ring, the fingers, when the ring is fixed to the outer seal part, being

bent towards the cavity.

  The advantage of this configuration lies in the fact that the ring, including the fingers, can be made of sheet metal, by cutting, the fingers then being bent, from which it results in manufacture

  particularly economical of the ring.

  According to another essential characteristic of the invention, it is provided that the fingers are made as wedge-shaped bearing inserts, moving away

  approximately axially of the ring.

  This configuration makes it possible to support a relatively large surface area of the bearing inserts on

  the spherical outer surface of the cage.

  According to another embodiment of the invention, it is provided that the outer seal part is provided on a radial end surface associated with its open side, with a recess turned in the mass, -located radially inside and intended to receive the ring, the inside diameter of the recess turned in the mass being greater than the outside diameter of the ring. This execution allows a simple fixing by welding, of the ring on the part of external joint, the welding being able for example to be carried out by means of a laser beam, in the axial direction of the joint, which authorizes an automation of the operation welding. According to another embodiment, the ring is provided with a base coaxially enclosing the

  outer periphery of the outer seal portion.

  This embodiment also allows simple welding of the ring on the outer joint part. According to another advantageous configuration of the invention, the coaxial base of the ring is used as a seat for a bellows fixed on the part

outer seal.

  In the case of this configuration, the bellows can be simply attached to the base

coaxial of the ring.

  According to another configuration of the invention, the ring, relative to the outer periphery of the outer seal part, has a larger diameter, and the portion of the ring protruding from the outer periphery of the outer seal part is used as a stop for a bellows fixed on the outer periphery of the part

outer seal.

  This embodiment provides a simple and economical possibility for fixing the bellows to the

outer seal part.

  According to a preferred embodiment of the invention, the outer seal part is provided on its open axial side, with at least two grooves extending in the radial direction, in the radially outer zone is fixed a closed ring, and the ring is provided with fingers which correspond to the grooves, pass radially through the grooves, and are held in abutment on the spherical outer surface

from the cage.

  In this embodiment, the ring, including the fingers, is integrated into the axial length of the outer joint part, so that there does not appear to be any obstacle to the maximum bending angle of the joint. According to another advantageous characteristic, the external seal part is provided, on the open axial side, with a peripheral recess, and the free space situated radially on the outside and resulting from the recess, is provided to receive the

Ring.

  This execution allows a simple welding of the

  ring on the outer seal part.

  According to another embodiment of the invention, the ring is made of a flat material extending radially, and is welded to the outer periphery of the outer joint part by a

"V" cord.

  Here also, this results in a possibility of simple fixing of the ring on the outer seal part. According to another advantageous configuration, provision is made for the ring to be produced as a ring coaxial with the axis of the joint, and enclosing the external periphery of the external joint part by being welded thereto by a corner bead , and that the

  fingers are bent in the direction of the joint axis.

  According to another characteristic of the invention, the fingers, from the radial direction directed inwards, are moreover bent substantially axially, in the direction of the center of the joint, and the bent branch is adapted to the external surface spherical of the cage This configuration makes it possible to obtain a large surface support of the finger on

  the spherical outer surface of the cage.

  According to another characteristic of the invention, the fingers, as a hollow profile, have almost a box shape, and the bearing surface is adapted to the spherical outer surface of

the cage.

  In this case, the fingers can support

  significant axial loads, which act on the cage.

  According to another configuration, the fingers, as a solid profile, have a rectangular cross section, the surface of the fingers, located radially inside, being adapted to the

  spherical outer surface of the cage.

  In the following, the invention will be explained in more detail with regard to the exemplary embodiments represented in the appended drawings, which show: FIG. 1 a longitudinal section of a fixed constant velocity joint, showing the arrangement of the ring, in the situation in which the balls are free from play in the internal and external raceways; Fig 2 a ring connected by welding to the outer seal part; Fig 3 a ring having a coaxial base, in the position in which it is welded to the outer seal part; Fig 4 a longitudinal section of a seal comprising a ring which as to its outer diameter is larger than the outer seal portion, in order to support a bellows; Fig 5 a longitudinal section of a joint using a coaxial base as a bearing for a bellows to be fixed; Fig 6 a longitudinal section of a seal comprising a recess turned in the mass, intended to receive the ring; Fig 7 a representation similar to Figure 6, the ring being however welded to the outer seal part; Fig 8 a top view of the configuration according to Figure 7; Fig 9 Fig 9 a Fig 10 Fig l Oa Fig 11 a longitudinal section of an embodiment of the seal, according to which the fingers are arranged in grooves extending radially at the open end of the outer seal part; a top view of the representation according to FIG. 9; an embodiment according to Figure 7, however comprising a coaxial base for fixing the ring on the outer seal part; a top view of the representation according to FIG. 10; the configuration of the fingers comprising a bent branch; Fig lla a top view of the representation according to Figure 11; Fig 12 Fig 12 a Fig 13 Fig 13 has a representation of the fingers as a hollow box-shaped profile; a top view of the representation according to FIG. 12; the configuration of the fingers in the form of a solid profile; a top view of the representation according to FIG. 13; and Fig 14 a longitudinal section of a complete joint

according to figure 13.

  The fixed constant velocity joint shown in longitudinal section in FIG. 1, is essentially composed of an external joint part 1, an internal joint part 2, and a cage 3 which guides, in openings, balls held in place in external raceways 15 and in internal raceways 20 The ring 6 is provided, in the case of the present embodiment, with wedge-shaped bearing inserts 22, which engage in space inside the seal, each between two outer raceways 15, which are held in abutment on the spherical outer surface 4 of the cage 3 The bearing surfaces Il of the ring 6 on the spherical outer surface 4 of the cage 3, are designed such that for a play-free support of the balls 8 in the external raceways 15 and in the internal raceways 20, the ring 6 has an axial spacing (s) from the radial reference surface 21, 21 a located in front of the open side of the

outer seal part.

  The cage 3, apart from the fingers 7 or the support inserts 22 which support it, is not at all

  in contact with the outer seal part 1.

  In the case of the embodiment according to FIG. 2, the ring 6 is provided with bent fingers 7, which for their part rest on the external surface

spherical 4 of the cage 3.

  FIG. 3 indicates that in this case also, the condition that the ring 6 is arranged so as to have a spacing relative to the reference surfaces 21 and 21 a is respected. It shows a ring 6 which is provided with a coaxial base. 12, the coaxial base 12 enclosing the outer seal part while being fixed on the outer surface of the outer seal part 1. FIG. 4 shows the embodiment according to which the ring 6, relative to the outer periphery of the outer seal part 1, has a larger diameter, the part of the ring 6 projecting from the outer seal part, being used as a stop for a bellows 23 fixed on the outer periphery of the seal part

outdoor 1.

  FIG. 5 shows a ring 6 comprising a coaxial base 12, also enclosing the outer seal part 1, and which according to this embodiment,

  is used as a bearing for a bellows 23.

  The outer seal part 1 shown in FIG. 6 is provided with a turned recess 24

  in the mass, arranged on its open radial face.

  The recess 24 turned in the mass, located on the inner radial side of the outer joint part 1, is intended to receive the ring 6, the inside diameter of the recess 24 turned in the mass being greater than the outside diameter of the ring 6, so that the ring 6 can orient itself perfectly with respect to the surface

  outer spherical 4 of the cage 3.

  Figure 7 shows a seal according to the configuration of Figure 6, the ring being welded to the outer seal part The outer seal part 1 is provided with a pin 14 which is grooved

  16 and is provided with a threaded bore 19.

  Figure 8 shows a top view of the seal

according to figure 7.

  Figures 9 to 14 show embodiments of the fixed constant velocity joint, according to which any obstruction of the bending angle of the joint is avoided, due to the arrangement of the ring 6 on the part

outer seal 1.

  In the case of FIG. 9, on the open front side of the outer joint part 1, there is provided a recess 17 creating a free space 18 located radially on the outside. For the reception of the fingers 7, grooves 5 s are provided. 'extending radially inwards from the free space 18, and in which the fingers 7 are arranged, so that there does not appear any axial projection on the outer seal part 1, thus avoiding hindering the angle of

bending of the joint.

  Figure 9a shows a top view of the mode

according to FIG. 9.

  In the case of Figure 10, the ring 6 is provided with a coaxial base 12 which encloses the outer seal part 1, and which is fixed thereto by welding. Figure i Qa shows a top view of the mode

according to FIG. 10.

  In Figure There is shown a fixed constant velocity joint, in which the fingers 7 directed radially inwards, have a bent branch 9, which is supported on the outer surface

spherical 4 of the cage 3.

  FIG. 11a shows a top view of FIG. 11. FIG. 12 shows an embodiment according to which the fingers 7 are produced as a hollow profile 10, in the form of a box. This embodiment leads to a particularly configuration

stable fingers 7.

  Figure 12a again shows a view of

  above the embodiment according to FIG. 12.

  In FIG. 13, the fingers are represented in the form of a solid profile. FIG. 13 a shows a top view of the representation according to FIG. 13. FIG. 14 shows a complete joint in longitudinal section, according to the embodiment of Figure 13.

Claims (11)

CLAIMS.   1 fixed constant velocity joint comprising an external joint part made in the shape of a bell, having a cavity and comprising external raceways without undercut, evenly distributed on the periphery, an internal joint part comprising internal raceways corresponding to the outer raceways, as well as balls which are housed in the outer and inner raceways, which transmit the torque and which are held in openings of a cage arranged between the outer seal part and the seal part inner, the inner surfaces of the outer seal part, located between the outer raceways, being produced without undercut, and the cage being stopped axially outward, by means of bearing inserts associated with a ring and arranged between the outer raceways, characterized in that the balls (8) are held without play in the outer raceways (15) and in the inner raceways (20), in that on this occasion the ring (6), provided with at least two fingers (7) directed axially and radially towards the inside of the cavity of the outer seal part (1), and held in abutment, each between two outer raceways (15), against the spherical outer surface (4) of the cage (3), has an axial spacing (s) of a reference surface (21, 21 a) located on the open side of the outer seal part (1), and in that the ring (6) is connected to the outer seal part (1) respecting a predetermined axial clearance with respect to the cage (3), the inner surfaces of the outer seal part (1), located between the outer raceways (15), being maintained away from the   spherical outer surface (4) of the cage (3).   2 constant velocity joint according to claim 1, characterized in that the fingers (7), when the ring (6) is fixed on the outer joint part   (1), are bent towards the cavity (19).   3 CV joint according to claim 1, characterized in that the fingers (7) are made as wedge-shaped bearing inserts (22), moving away approximately axially from the ring (6).   4 constant velocity joint according to claim 1, characterized in that the outer joint part (1) is provided on a radial end surface associated with its open side, with a recess (24) turned in the mass, located radially at the interior and intended to receive the ring (6), the interior diameter of the recess (24) turned in the mass being greater   the outside diameter of the ring (6).   Constant velocity joint according to claim 1, characterized in that the ring (6) is provided with a base (12) coaxially enclosing the periphery   outside of the outer seal part (1). 6 CV joint according to   Claims 1 and 4, characterized in that the base   coaxial (12) of the ring (6) is used as a bearing for a bellows (23) fixed on the joint part exterior (1).   7 constant velocity joint according to claim 1, characterized in that the ring (6), relative to the outer periphery of the outer joint part (1), has a larger diameter, and in that the part of the ring ( 6) protruding from the outer periphery of the outer seal part (1) is used as a stop for a bellows (23) fixed on the outer periphery of the seal part exterior (1).   8 constant velocity joint according to claim 1, characterized in that the outer joint part (1) is provided on its open axial side with at least two grooves (5) extending in the radial direction, in that in the radially outer zone is fixed a closed ring (6), and in that the ring (6) is provided with fingers (7) which correspond to the grooves (5), radially pass through the grooves (5), and are held in abutment on the spherical outer surface (4) of the cage (3).   9 CV joint according to claim 1, characterized in that the outer joint part (1) is provided, on the open axial side, with a peripheral recess (17), and in that the free space (18) located Radially outside and resulting from the recess (17), is provided to receive the ring (6). Constant velocity joint according to claim 1, characterized in that the ring (6) is made of a flat material extending radially, and is welded to the outer periphery of the joint part   outside (1) by a "V" cord.   11 CV joint according to claim 1, characterized in that the ring (6) is produced as a ring (12) coaxial with the axis of the seal, and enclosing the outer periphery of the outer seal part (1) being welded to it by a corner bead, and in that the fingers (7) are bent in the direction of the joint axis.   12 CV joint according to claim 1, characterized in that the fingers (7), from the radial direction directed inwards, are moreover bent substantially axially, towards the center of the joint, and in that the bent branch (9) is adapted to the spherical outer surface (4) of the cage (3). 13 CV joint according to claim 1, characterized in that the fingers (7), as a hollow profile, have almost a box shape, and in that the bearing surface (11) is adapted to the spherical outer surface (4) of the cage (3).  14 CV joint according to claim 1, characterized in that the fingers (7), as a solid profile (13), have a rectangular cross section, the surface (14) of the fingers (7), located radially inside , being adapted to the surface   outer spherical (4) of the cage (3).