FR2634276A1 - OIL COOLER - Google Patents

Abstract

The oil cooler, object of the invention is characterized in that the fixing element 20; 120, 120a has a protruding radial element 25; 125, 125a which extends above and is applied against an element integral with the envelope which is crossed by the fixing element 20; 120, 120a, on the side thereof which is oriented opposite to the structural element 21; 121 and is turned to the side 28; 128, 128a from inside 12; 112 of the casing and which, when the fastening element 20 is tightened; 120, 120a of the envelope 11, 111 exerts pressure against the structural element 21; 121, at least, in the region of the element integral with the casing 27, 127, 127a.

Description

The very invention relates to a cooling

  oil disseur of the type which comprises a casing in which circulates a cooling agent such as water, for example, a bundle of tubular or hollow elements housed in said casing which consists of a number of individual superimposed hollow flat elements, separated by intervals, in which the oil to be circulated

  and at least one element of the cooling arrangements

  approximately tubular, passing through the envelope and the pack of hollow elements, comprising at its end a recess or a threaded step making it possible to fix

  the cooler on a support structure and which

  outside the envelope and has an internal channel

  laughing conduisan. the oil which opens at the end of the

  threaded hook and towards said structure.

  Dan.s a known cooler of this type (DE-OS 23 06 426 ;, is used to fix the cooler on a support structure, a fixing tube comprising at its end a threaded recess which is screwed firmly into a threaded hole the structure, a protruding collar being provided to limit the insertion depth by abutting against the opposite front surface of the mounting structure. The oil cooler is threaded on this fixing tube which passes through the envelope containing the package. '' hollow element, and whose offset rises beyond

  of the envelope and is provided at this point with a thread.

  To mount the cooler, it has been provided on this

  protruding terminal, a locking nut which, at

  tightening, press the cooler firmly against the structure

  mounting structure. The clamping forces involved

  during assembly are applied over the entire length of the fixing tube

  ing through the cooler. In this arrangement, the fixing tube only serves as a reaction surface, while the tightening forces are transmitted by the nut

  to the package of hollow elements contained inside the

  to the package. hollow elements contained inside the

  veloppe. Under these conditions, the package of hollow elements and, in particular, each of these elements, which are relatively fragile components, is subjected to the action.

  clamping force and therefore undergoes a pressure

  if we. Under these conditions, the hollow flat elements may deform and, in particular, be crushed and

  show leaks. In addition, the clamping forces used

  sands are limited because of this. To this is added that

  method of fixing the cooler to the mounting structure

tage is relatively complicated.

  The present invention has set itself the aim of producing an oil cooler of the above type, the mounting and fixing of which on the structural element is

simpler and less restrictive.

  This object is achieved in that the fixing element

  tion present, a short distance from the end of its

  threaded hook, at least one radial projection which

  puts a simpler and less restrictive fixation of the re-

  cooler on a structural element.

  The invention offers the following advantages:

  tubular fastening element acts as a tightening and tensioning element only over a relatively short distance, while the serrate forces are transmitted, by the radial projection (s), to a part integral with the envelope, for example , to a bottom plate of the latter and, from there, act directly on the structural element on which the oil cooler is to be fixed. Under these conditions, the remaining part of the tubular fastening element can be used for other purposes, for example, as an oil circulation duct. In

  it is not subject to the clamping forces which

  rent the fixing of the oil cooler on the structure.

  Thus, it can be seen that the invention considerably simplifies

  fixing the cooler to a structural element.

  In addition, because the fixing forces act only - 3 over a relatively short distance, and only between the casing and the oil cooler, for example, between

  the bottom plate of it or a part attached to it

  ci, and the structural element, the rest of the envelope and, in particular, the package of hollow elements and its flat elements are relieved of these forces, which avoids the risks of undesirable leaks due to excessive forces. To this is added an extreme simplicity of fixing, any additional elements, such as spacers, stops, etc., becoming superfluous. Fasteners

  are, moreover, simpler and, for the obvious reasons

  quées, or. saves space and the space thus saved

  can be used for other purposes, for example, to

  ensure better circulation distribution and / or

  to increase the area of the heat exchange surfaces.

  Other characteristics and advantages of information

  vention will emerge from the following description of

  certain preferred embodiments of the invention

  having, of course, no limiting character, in reference to

  Reference to drawing. attached, of which: Figure 1 is a schematic sectional view of an oil cooler according to a first embodiment of the invention; Figure 2 is a plan view of a cooler seal; Figure 3 is a sectional view along line IIi-III of Figure 1; and Figure 4 is a schematic sectional view

  of a second embodiment of the invention.

  Figure 1 shows schematically a re-

  oil cooler 10 before a structure formed of an em-

  pounding of flat elements, which includes an envelope! I

  whose interior 12 is traversed by a coolant

  such as water, introduced by an inlet 13 and which

  comes out at the other end through an outlet 14. The envelope

  pe 11 consists of two parts, in particular a base plate or upper bottom 15 and a cover 16, in the form of a bowl, for example hermetically closed, by

example, welded.

  The envelope contains a package or a stack

  hollow elements 17 which consists of a number of elements

  flat cake-shaped pieces 18 superimposed welded together

  ble by creating intervals between them, elements inside

  18 which circulates the oil to be cooled.

  In the first embodiment, the interior 19 of the

  package or stack 17 of flat elements is divided at mid-

  height to produce three circulation spaces

  upper lower and three upper circulation spaces

  laughs for the oil. We thus obtain a mode of construction

tion says "two streams".

  The oil cooler 10 also has at least one fixing element 20 intended to allow it to be mounted on a structure or a construction element 21, of which only one wall 22 has been shown. In the present case, the structure 21 is that of a motor, a gearbox, etc. The fixing element 20 passes through the casing i ′ as well as the pack of flat elements 17 and

  has, at its end, a threaded recess 23 per-

  putting the cooler 10 on the structure 21,

  this threaded portion 23 being relatively short, its ex-

  end protruding from the casing I1 and, in particular, from the base plate 15. The fixing element 20 comprises an internal channel 24, in which the oil circulates, channel which

  opens at the end of the threaded recess 23, in the direction

tion of the structure 21.

  The fastening element 20 has very little

  tance of the end of its threaded recess S, at least, a radial projection 25 which, in the present case, has

  the shape of a fastener 20. In another example-

  ple of embodiment, not shown, in which the ring 26 is an independent component of the fixing element, this ring is immobilized on the latter axially, at least, in the screwing direction. In another embodiment, also not shown, the radial projection 25 is constituted by, at least, a radial pin. The radial projection 26, whether it takes the form of a ring 26 or that of a radial pin, is dimensioned in the radial direction so as to come to apply and abut against the side opposite to the structure 21 and which is opposite the face 28 facing inward 12 of a fixed part 27 of the casing 11; During the tightening of the

  attachment 20, this radial projection 25 is capable of pressing

  ser the envelope 11, at least, in the region of the element 27 which is integral therewith, against the wall 22 of the structure 21 and to fix it. The wall 22 is pierced with an opening 29 which contains a thread 30 into which can be screwed

  the threaded recess 23. The end = of the fixing element

  tion 20, located opposite the end of the fi-

  smoothness 23, compcrte a cylindrical bulge 31 which engages in a corresponding opening 32 of the fixed part 33 of the casing 11 with a certain axial clearance, but however in a sealed manner. Between the bulge 31 and the envelope part 33 is interposed a seal 34, a ring, by

  example, which is held in a groove in the cylinder bulge

  drique 31. In this region the fastening element '20 pre-

  feels an interior and / or exterior tool application surface 35, which may be in the form of six

  exterior or interior panels. The end bearing the over-

  tool application face 35 has the shape of a head having a larger diameter than the rest of the part 36

  of the body of the fastener 20.

  The fixed part 27 of the casing which, according to FIG. 1, is biassed axially upward by the projection or the collar 26, is formed by a socket which is fixed to the adjacent base plate 15 of the casing

  11, for example, by welding. The other part fixed in the

  veloppe 33, crossed with a certain play of axial movement by the cylindrical recess 31 of the fixing element

  , also consists of a sheet attached to the cover

  key 16 of the casing 11, opposite the base plate 15, for example, by welding. Between the fixed casing part 27, pressed against the wall 22 and said wall 22 of the structure 21 is interposed a seal 37 which has arcuate slots 38 and is pierced with a central opening 39 which passes through the threaded recess 23. L fastening element 20 comprises, approximately over its half length which passes through the pack of hollow element 17, of an annular partition 40 which can either be an element separate from the body 36, or, as shown, consist of

  a collar forming an integral part of the fixing element

  tion 20. The partition 40 makes it possible to divide the tubular oil channel 41, which passes through the package of elements 17, in two? sections 41a and 41b, the partition 40 preventing oil from passing axially from the inside of a flat element 18

next.

  T fixing element 20 is, in principle,

  read in the form of a hollow screw, at least in part. The internal channel 24 of this screw is open axially at its end close to the threaded recess 23 so

  that it is connected to the opening 29 of the wall 22. As a result

  shot from the structural element 21, a conduit 42 is screwed into the internal thread 40 of the opening 29, conduit whose collar 43 is applied, by means of a seal 44, in a sealed manner against the internal face of the wall

  22 and which has the function of transferring the oil from the

  térieur of the structure 21, in the direction of the arrow.

  The inner channel 24 of the fixing element 20 is closed

  mé, at a certain axial distance from its open end

  te, in this case, in the region of the cylindrical recess 31, and is connected thereto to the channel section 41b by radial openings 45. Thanks to this arrangement, the oil introduced into the channel 24 arrives at the openings

  radial 45 and gains, by the latter, the section of ca-

  nal lower 41b from which oil can reach the es-

  individual interior spaces of the three lower flat elements

  laughers, located under partition 40. It is in the region

  of channel 46 that the change of direction of the oil takes place

  deviating from the lower group of hollow elements to the upper group. From there, the oil gains, through the interior spaces the three flat elements. upper 18, mounted

  above the partition 40, in the upper channel section

  lower 41a. The fixed casing element 27 mounted on the plate

  than base 15, present, in the region which is not covered

  green by the collar 26, axial openings 47 which comprise

  provide with corresponding axial openings 48 drilled in the wall 22 of the structure 21, while

  their other end opens into the channel section 41a.

  The axial openings 47 and 48 coincide with the arcuate slots 38 of the seal 37, so that the flow of oil

  flowing in the direction of arrow 49 from the sec-

  tion of channel 41a, can flow back into the structure 21 through the openings 47 and 48. The incoming oil flow is kept separate from the outgoing oil flow through the conduit 42 of the structural element 21. '

  In the first exemplary embodiment, the

  veloppe i contains only one fixing element 20.

  At a certain distance, in the transverse direction, there has been mounted, between the structural element 21 and the casing 11, a spacer 50. This spacer 50 is simply constituted by a stamped boss 51 d 'one piece with the bottom plate -15. This presence has the consequence that when the fastening element 20 is tightened by pressing it, by means of the fixed element 27 of the envelope and the seal 27, against the wall 22 of

  the envelope 21} a tightening is obtained, at least, essential-

  symmetrically symmetrical to the entire bottom plate 15,

  that the latter is also pressed against the wall 22

  in the boss region 51. Since all of the pa-

  quet 17 of hollow elements is securely connected to the envelope

  pe 11, for example, by welding, it follows that, from this

  so the whole oil cooler 10 is firmly pressed

  dried in block against wall 22. Furthermore, given

  that the collar 26, which is applied against the side 28 of the element

  27, is located very close to the

  Clearly threaded 23, which engages in the internal thread 30 of the wall 22, it is clear that the clamping forces are not

  transmitted only after. a short drive. Therefore, not only

  The mounting of the oil cooler 10 is considerably simplified, but, in addition, the hollow flat elements 10 constituting the package or the block 17 are completely protected from the clamping forces which are exerted during mounting; in fact, when the fastening element 20 is tightened, the tensile forces are exerted, from the collar 26, by means of the element integral with the casing '- and the jcin - 37, directly on the wall 22 of the structural element 21. It will be noted that auxiliary fixing means, such as sockets or spacers scnt perfectly superfluous. This results in cost savings and a reduction in the number of components.

  and, furthermore, a reduction in the size of the outlet

  that the space thus saved can be used for

  ensure a better distribution of the circulation of -

  rants and / or to enlarge the heat exchange surfaces

their.

  For the second example of embodiment, represented

  tee in figure 4, we adopted, for the cor-

  corresponding to those of the first embodiment, the same references increased by 10C in order to avoid repetitions

tedious and useless.

  The oil cooler 110 in Figure 4

  includes two fasteners 120, 120a, which are mounted

  tees at a certain lateral distance from each other, which pass through the pack of hollow elements 117 and the casing 111 and have a terminal threaded recess 123, i23a which, counted in the first case, is screwed into the

  wall 122 of the structural element 121. The fixing element

  left side 120 is similar to element 20 of the first embodiment, with the difference, however, that the partition 140 is at a shorter axial distance from the collar 126 than in the first embodiment, so that the channel 124 only extends between the fastener 120, to

  finish in the region of partition 140. In the pre-

  sent, the radial openings 145 are located on the par-

  tie of the section between the collar 126 and the partition

  sound 140. Therefore, the oil cooler 110 has a triple circulation structure. Indeed, the oil which

  circulates in the pack of hollow elements 117 crosses it

  ci in three sections, namely: first, leaving the radial openings 145, the oil first crosses the two

  upper hollow flat elements 118, then, after having changed

i0

  direction in the region of the right channel 146, pas-

  se in the two underlying flat elements 118, for

  thereafter, after having again been deflected into the left channel 141, pass through the two lower flat elements 118, after which the oil leaves the envelope 111, in the direction of arrow 152, by one or more

  openings in the region of the cover 116, for ar-

  river in a filter 153, the outline of which was simply sketched in lines and dots, filter from which the oil flows back against the current, in the direction of arrow 154, and passes through the fixing element 120a. In fact that the current

  back through the fixing element 120a, the openings

  axial tures 47, 48 provided for in the first exemplary embodiment

  tion in the fixed element 127 and in the wall 122 become unnecessary. In addition, the left fixing element 120

  has the same structure as in the first mcde of realization-

  tion, to which we can therefore refer for more

  cisions. The second fixing element 120a, on the right in FIG. 4, contains a channel 124a, open at both ends. The end of this fastening element 120a opposite the threaded recess 123a has the shape of a

  support element 155 intended for mounting the filter 153.

  The support element 155 has a cylindrical head 156 having a thread 157 onto which the filter 153 can be screwed. Between the element integral with the envelope 133a,

  which can also be in the form of a sleeve, for example-

  ple, and the part of the fixing element 120a which travels it

  a number of openings have been provided for

  put the oil to circulate, in the direction of the arrow

  che 152, between the pack of hollow elements 117 and the filter

  153. The filter 153 is connected tightly to the

  lids 116 of the envelope 111, for example, by the inter--

  medial of a seal 158. In order to relieve the cover 116 and, consequently the envelope 111, as well as the pack of hollow elements 117 which it contains, clamping forces due to * 11

  screwing the filter 153, the second fixing element for

  may have a radial stop, not shown, against

  which the filter 153 is applied axially to the screw

  wise. The partition 140a of the second fastening element 120a is here located approximately half the length of the latter so that the triple deflection of the oil

  is also provided as described above.

Claims (14)

CLAIMS ONS - Oil cooler of the cui type comprises an envelope in which circulates a cooling agent such as water, for example, a bundle of tubular or hollow elements housed in said envelope which consists of a certain number of superimposed individual flat hollow elements, separated by intervals, in which the oil to be cooled circulates and, at least, one approximately tubular cooler mounting element, passing through the envelope and the package of hollow elements , which has, at its end, a threaded recess making it possible to fix the cooler on a support structure and which advances outside the casing and has an internal channel conducting the oil, which de - mouth at the end of the threaded recess, in the direction of said structure, characterized in that the fixing element (20; 120, 120a) has a projecting radial element (25; 125, 125a) which s' tends above and bears against a member integral with the casing through which the fastening element (20; 120, 120a), on the side thereof which is opposite to the structural element (21; 121) and is turned on the side (28; 128, 128a) of the interior (12; 112) of the envelope and which, when the fastening element (20; 120, 120a) of the envelope (11, 111) exerts pressure against the structural element (21; 121), less, in the region of the element integral with the envelope (27; 127, 127a). 2o- Oil cooler according to claim 1, characterized in that the protruding radial element (s) (25; 125, 125a) are formed from at least one radial pin.   3 - Oil cooler according to the claim   tion 1, characterized in that the projecting radial element (s) (25; 125, 125a) consist of an element annular (26; 126, 126a).   4 - Oil cooler according to the claim   tion 3, characterized in that the annular element (26; 126, 126a) is mounted on the fixing element (20; 120, 120a) so as not to move axially, at least, in the direction of screwing .   - Oil cooler as claimed -   tion 3 or 4, characterized in that the annular element (20;   , 120a) is constituted by a collar made of material.   6 - 'Oil cooler according to any one   claims 1 to 5, characterized in that the one or more   fastening elements (20; 120) comprise, at the end opposite to that which is provided with a threaded recess   (23; 123), a cylindrical bulge (31; 131) which engages   ge axially in a corresponding bore (32) of a part   (33; 133) integral with the envelope (11; 111).   - Oil cooler as claimed -   tion 6, characterized in that a sealing element (34), for example an annular seal, is interposed between the cylindrical bulge (31) and the element (33) integral of the envelope.   - Oil cooler according to any one   as in claims 1 to 7, characterized in that the element   fixing ment (20; 120, 120a) has at its end   opposite and distant a tool application surface ex-   interior and / or interior (35; 135, 135a), for example,   external or internal hex.   9 - Oil cooler according to any one   as claims 6 to 8, characterized in that the former   end provided with the tool application surface (35; 135, 135a) has a reinforced head whose diameter is larger than that of the rest of the body (36; 136, 136a)   of the fixing element (20; 120, 120a).    - Oil cooler according to any one   as in claims 1 to 9, characterized in that the element   integral with the envelope (27; 127, 127a), against the   which applies the radial extension (25; 125, 125a) of the fixing element (20; 120, 120a), es = constituted by a socket which is fixed to the adjacent bottom plate (15; 115) of the envelope (11; lii).   11 - Oil cooler according to any one   as in claims 1 to 10, characterized in that the element   ment (33; 133) integral with the envelope is constituted by   a socket which is fixed to the cover (16; 116) of the   veloppe (11; 111) opposite the bottom plate (15; 115).   12 - Oil cooler according to any one   as in claims 1 to 11, characterized in that between   the element integral with the envelope (27; 127, 127a) pres-   in particular against the structural element (21; 121),   against the socket and / or the bottom plate (15, 115) of the   veloppe (11, 111), on the one hand, and the structural element (21, 121, on the other hand, a seal (37) is mounted in the   clamping range of the fastening element (20; 120, 120a).   13 - Oil cooler according to any one   as in claims 1 to 13, characterized in that the element   fixing ment (20; 120, 120a) comprises, in the section between the end of the threaded recess (23; 123,   123a) on the one hand, and the end of the applica-   tion of tool (35; 135, 135a), on the other hand, at least, an annular partition (40; 140, 140a) by means of which the   oil circulation channel (41; 146) which crosses the wall   quet of hollow elements (17; 117) is subdivided into two sec-   axial positions (41a, 41b), said partition (40; 140, 140a) preventing axial circulation of the oil from the inside   from a flat hollow element (18; 118) to the next.   14 - Oil cooler according to the claim   tion 13, characterized in that the partition (40; 140, 140a) consists of a one-piece collar with the element fixing (20; 120, 120a).    - Oil cooler according to any one   as in claims 1 to 14, characterized in that the element   fixing ment (20; 120, 120a) has the form of a   hollow screw, at least partially.   16- Oil cooler according to the claim   tion 15, characterized in that the internal channel (24; 124, 124a) of the hollow screw is cuvert at the near axial end   threaded recess (23; 123, 123a).   1? '- Oil cooler according to claim 16, characterized in that the internal channel (24; 124, 124a) is closed axially at a certain axial distance from the open end, for example in the region of the   opposite head or at some axial distance from it this.   18 - Oil cooler according to any one   as in claims 1 to 17, characterized in that the   inner channel (24; 124, 124a) is open in the section between the head and the partition (40; 140) and / or between the partition. (40; 140) and the threaded recess (23; 123)   and communicates with the oil circulation channel of the   quet of hollow elements (17; 117) surrounding the body (30;   ) of the fixing element (20; 120).   -9- Oil cooler according to any one-   as in claims 1 to 18, characterized in that the element   ment secured to the casing (27) against which the action of at least one radial projection (25) is exerted, in particular a collar (26) of the fixing element (20), in particular the bush, has, outside the field of action, axial openings (47) for example, holes, which are   in communication, at one end, with axial openings   the corresponding (48) of the structure (21, 121) for recycling the oil, and at the other end, open out   in the oil circulation channel (41) of the element package hollow elements (17).    - Oil cooler according to claims -   tions12 and 19, characterized in that the seal (37) has slots in the region of the axial openings (47, 48) arched (38).   2!: - Oil cooler according to any one -   as in claims 1 to 20, characterized in that the   veloppe ('') has a fixing element (20) and   what, at a certain transverse distance between the element   structural structure (21) and the casing is arranged an element spacer (50).   22 - Oil cooler according to claim 21, characterized in that the spacer (50) is constituted by a stamping (51) in one piece with the bottom plate (15).   23 - Oil cooler according to any one   as in claims 1 to 20, characterized in that the   veloppe (111) comprises two fixing elements (120, 120a) mounted at a certain transverse distance from each other, one of these two fixing elements (120) being pierced with the oil circulation channel ( 141) ensuring the arrival   of this, while the other has the circulation channel   lation (146) ensuring the return of the oil in the package hollow elements (117).   24 - Oil cooler according to the claim   tion 23, characterized in that the second fixing element   tion (120a) contains a channel (124a) open at both ends moths.    - Oil cooler as claimed -   tion 23 or 24, characterized in that the second fixing element (120a) is arranged, at its end opposite to the threaded recess (123a), to constitute a support (155) to mount a filter (153).   26 - Oil cooler according to the claim   tion 25, characterized in that the support (155) has a cylindrical head (156) having an external thread   allowing a filter (153) to be screwed onto it.   27a- Oil cooler according to any one   as in claims 24 to 26, characterized in that the element   integral with the envelope (133a), in particular between the sleeve and the end of the fixing element (120a) which   the crosspiece and which has the support (155), one or more   several openings (152) are provided to allow the circulation of oil between the package of elements (117) and the filter (153).   28: - Oil cooler according to any one   as in claims 25 to 27, characterized in that the   second fastening element (120a) has at least one   radial stop against which the filter (153) comes to rest bend at the end of the screwing.