FR2616698A1 - PROBE FOR FLARING SIMULTANEOUSLY HYDRAULICALLY LONGITUDINAL PARTS OF A HOLLOW SHAFT IN ORDER TO ATTACH PARTS SUCH AS SPROCKETS - Google Patents

Abstract

This probe has at least one longitudinal hydraulic oil supply channel, from which leaves a radial supply orifice 14a, 14b for each longitudinal segment to be flared of the tube forming the hollow shaft, as well as sealing means ( received in grooves 6a, 6b; 7a, 7b) which limit the action of the pressure fluid to the segments to be flared of the shaft. In order to better adapt to the irregularities of the internal wall of the tube to be flared, the body of the probe consists of rigid longitudinal sections 3, 5 of cylindrical shape and of large diameter, which carry the sealing rings, and of flexible longitudinal sections 4a, 4b connecting the rigid sections and made of thinner tube, resistant to pressure.

Description

The present invention relates to a pressure fluid probe for

  simultaneously hydraulically flaring several longitudinal segments of a hollow shaft, increasing their outside diameter, with a view to establishing connections by

  OS adhesion and / or splashing between this tree and elements of cons-

  truction slipped over it, such as cams, sprockets,

  bearing parts, probe which has at least one long channel

  pressure fluid supply tudinal (oil for example), from which a radial supply orifice for each longitudinal segment to be flared from the hollow shaft, as well as sealing means which limit the action of the fluid , coming out of the orifices

  to the flaring segments of the shaft.

  A device of this type is known from German patent application P 35 30 600.9. The simple O-rings provided in this device as sealing elements are not suitable

  to guarantee reliable sealing on all flare sections -

  ment, due to the fact that the internal wall of the tubes to be flared has, at different points in the length, radial defects which it is impossible to compensate with the construction of the probe illustrated in this document. In fact, a single point that is not sealed is enough for the establishment of a pressure to be impossible and, as a result, the ability to operate the probe as a whole.

be canceled.

  The object of the present invention is to provide a pressure fluid probe which, thanks to its construction, is capable of compensating for deviations - as regards the axial orientation and the diameter - from the internal wall of the tube, c that is to say of the hollow shaft, with respect to a perfectly cylindrical internal shape, and which makes it possible to obtain a secure seal for all sections

flare.

  For this purpose, a probe as defined at the beginning is charac-

  characterized in that the body of the probe is made up of rigid longitudinal sections, of cylindrical shape and of large diameter, which carry the sealing means, and of flexible longitudinal sections connecting the rigid sections and produced in tube plus

thin, pressure resistant.

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  Thanks to this embodiment according to the invention, it is possible to provide, on the one hand, sealing means guided exactly in the rigid longitudinal sections and designed with a close fit relative to the tube forming the shaft, while, on the other apart, the flexible longitudinal sections, connecting the rigid sections together, allow the probe to yield, that is to say to deviate from the longitudinal axis of the probe, if the tube has radial defects opposite the different rigid flaring sections. Thus, during the application of the pressure, each sealing means is positioned favorably with respect to the longitudinal segment to be flared and it becomes possible to also use, in particular, sealing means subjected to the pressure, it is that is to say capable of being radially widened and having only to perform a short working stroke. The form

  sealing means can practically be freely chosen.

  According to a particularly advantageous embodiment, each rigid longitudinal section is produced in two or three parts, in particular in the form of two or three parts assembled by screwing, so that sealing elements can be used

  relatively hard and not divided circumferentially.

  Generally, however, sealing elements will be used

  elastic, extensible, which are arranged in circumferential grooves

of rigid sections.

  A first advantageous embodiment provides for partial nesting of the flexible longitudinal sections in the

  rigid longitudinal sections and the watertight fixing of the end

  mite concerned of each flexible section in a rigid section.

  An advantageous execution of such a connection comprises the combination

  born of a coupling nut and a pressure piece screwed onto the end of the piece of tube forming the flexible section, the nut, during tightening, acting on this pressure piece. The threads to be provided in this case on the end of the piece of tube for the screwing of the pressure piece on the one hand and for screwing the coupling nut in a tapped hole of the rigid section, on the other hand, must have, in this case, opposite steps. It is preferable to carry out the sealing by providing the piece with

261 6698

  tube with a conical end pressed against a corresponding conical seat. According to a second possible embodiment, the flexible longitudinal sections are part of a continuous tube, on

  which are rigid rigid longitudinal sections,

  with a larger diameter. The connection between the flexible sections and the rigid sections is possible in this case by means of coupling nuts which act on cutting or clamping rings which hold the flexible tube in the rigid sections. To make the single tube of this embodiment communicate with the radial supply orifice in each rigid longitudinal section, a hole must be drilled in the tube, preferably following the connection of the different parts of

the probe.

  The two embodiments indicated above have

  the advantage that the constitution of a probe can be varied relatively

  simply and without problems, at least as regards the longitudinal distance between the different flaring sections,

  by combining these rigid sections, carrying the sealing elements

  chewiness, with pieces of tube of different lengths,

  adapted each time to the needs, the ends of which are fitted

  tees in the rigid sections, or, alternatively, by sliding the rigid sections on a single high pressure tube and fixing them on this tube. In the latter case, the modification of the probe requires the replacement of the high pressure tube and the

  drilling new radial holes in this tube.

  Apart from the aforementioned solutions, allowing an adaptation

  tion of the various elements, it is of course also possible to provide welded, brazed or soft welded assemblies between the rigid cylindrical sections and the pieces of tube fitted by their ends in these sections or

  the high pressure tube threaded through the rigid sections.

  An advantageous embodiment provides discharge holes extending longitudinally and outside the center of the rigid sections, in order to prevent the establishment of pressure in the region between two flare sections

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  neighbors in case of oil loss through leaks. It is also advantageous to provide radial holes for the flow

  leaking oil in the area of the fittings.

  Other characteristics and advantages of the invention

  will emerge more clearly from the description which follows from

  two preferred but in no way limiting examples of embodiment, as well as the accompanying drawings, in which:

  - Figure 1 is a schematic side view partL-

  Lement in axial section of a pressure fluid probe with flexible longitudinal sections in the form of pieces of tube fitted by their ends in the rigid sections; and - Figure 2 is a similar view of a probe whose flexible sections are constituted by a continuous tube threaded into

rigid sections.

  Corresponding parts of the representations are designated by the same references. In each of the two figures, we see on the left a coupling part 1 with a screw connection 2 for a pressure generating device; in the middle, a rigid flaring section 3, of cylindrical shape and to which two flexible longitudinal sections 4a and 4b are connected; and on the right, a terminal flaring section 5, also of cylindrical shape, which is closed at one end. Each of the flaring sections has a pair of annular grooves 6a, 6b and 7a,

  7b for the reception of not shown sealing rings.

  In FIG. 1, two separate pieces of flexible tube 4a, 4b are fixed in the connector 2 and in the rigid flaring sections 3 and 5 by means of coupling nuts 8a, 8b, 8c and 8d. The partial section reveals that a pressure piece 9 is screwed each time on the end of a section of flexible tube, of the section 4a in this case, against which

  apply nut 8b when screwed in the long section

  tudinal 3. Sealing is ensured by means of conical sealing surfaces 10 at the end of the flexible tube. The sections

  rigid longitudinal 3 and 5 have central channels of ali-

  pressure fluid mentation, designated by 13a and 13b, as well as radial supply orifices 14a, 14b, from which a hydraulic oil supply is effected from each of the annular spaces formed inside the tube, c ' is to say

  the shaft (not shown) to be flared and the rigid flaring sections-

  ment 3 and 5, each of these spaces being delimited by two elements

  sealing arranged in the annular grooves designated respec-

  tively by 6a, 6b and 7a, 7b. In the connection areas, the rigid longitudinal sections 3, 5 have holes

  discharge radials 11 and, alongside these, long holes

  eccentric tudinals 12 which are also used for discharging oil

leak.

  Figure 2 shows an embodiment o, unlike

  rence of what has just been described, the flexible sections are formed by a single tube 4, which is fixed, in the connector 2 and in the rigid sections 3 and 5, by means of a cutting or clamping ring 15; the fixing and sealing with respect to the tube are obtained in this case using a coupling nut (8b) having an inner surface having a taper complementary to that of the outer surface of the ring. In each of the rigid sections 3, 5, the tube 4 is provided, in the extension

  of the radial supply orifice 14a, 14b, of a radial hole 16.

  These holes should be drilled after the connections, but it is also possible to drill them beforehand and have them open into an internal annular chamber of the rigid section concerned, in which case the location of the hole may vary within certain limits. Rigid sections 3, 5 of this example

  also include axial discharge holes 12a, 12b.

  In the case where the flexible sections (4) are fixed, not using cutting or clamping rings 15 for example, as shown in FIG. 2, but by brazing for example, longitudinal grooves can be provided (not shown ) for receiving solder on tube 4 or in the holes (channels)

  longitudinal sections through which rigid sections 3, 5 pass.

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Claims (12)

CLAIMS R E V E N D I C A T I O N S   1. Pressure fluid probe for simultaneously hydraulically flaring several longitudinal segments of a hollow shaft, increasing their outside diameter, with a view to establishing adhesion and / or sputtering connections between this shaft and construction elements slid over it, such as cams, pinions, bearing parts, probe which has at least one longitudinal channel for supplying pressure fluid (oil for example), hence a radial supply orifice for each longitudinal segment to be flared from the hollow shaft, as well as sealing means which limit the action of the fluid, leaving the supply orifices, to the segments to be flared from the shaft, characterized in that the body of the probe consists of rigid longitudinal sections (3, 5), of cylindrical shape and of large diameter, which carry the sealing means, and of flexible longitudinal sections (4a, 4b, 4) connecting the rigid sections and   made of thinner, pressure-resistant tube.   2. Probe according to claim 1, characterized in that the flexible longitudinal sections (4a, 4b) are separate pieces of tube fitted at their ends in the sections rigid (3, 5).   3. Probe according to claim 2, characterized in that the flexible sections (4a, 4b) are fixed in the sections   rigid by means of coupling nuts (8b, 8c, 8d).   4. Probe according to claim 3, characterized in that the coupling nuts act on pressure pieces (9) screwed onto one end of a piece of tube and having a pitch of   thread opposite to that of the nut.   5. Probe according to any one of claims 2 to 4,   characterized in that the flexible sections (4a, 4b) have conical ends (10) by which they are pressed   tight against rigid sections (3, 5).   6. Probe according to claim 1, characterized in that the flexible longitudinal sections are formed by a tube   continuous (4) threaded through the rigid sections (3, 5). 26 1 6698   7. A probe according to claim 6, characterized in that the flexible sections (4) are fixed in the rigid sections (3,) by means of coupling nuts (8b, 8c, 8d) acting on   cutting or tightening rings (15).   8. Probe according to claim 6, characterized in that   the flexible sections (4) are brazed to the rigid sections (3, 5).   9. A probe according to claim 6, characterized in that longitudinal grooves for receiving solder are   provided on the tube (4) or in the holes or longitu-   dinals through which rigid sections pass.   10. Probe according to any one of claims 1 to 9,   characterized in that the rigid sections (3, 5) have   offset longitudinal holes (12) for leakage oil.   11. Probe according to any one of claims 1 to 10,   characterized in that the rigid sections (3, 5) have radial orifices (11) for the leakage oil, in particular at the right of fittings.   12. Probe according to any one of claims 1 to 11,   characterized in that each of the rigid longitudinal sections (3, 5) is made in two parts, with a view to the arrangement on   it of undivided sealing means.