FR2588333A1 - DIVIDED SMOOTH BEARING, PARTICULARLY CONNECTING ROD BEARING, FOR MEDIUM AND LARGE ENGINES - Google Patents

Abstract

IN A DIVIDED SMOOTH BEARING, IN PARTICULAR A CONNECTING ROD BEARING FOR MEDIUM AND LARGE ENGINES, IN WHICH THE SMOOTH BEARING ELEMENTS ARE HELD DETACHABLY BY MEANS OF RETAINING DEVICES, PREFERABLY PROVIDED BY PAIRS, DIRECTLY ACTING BY DIRECTORS SEPARATION SURFACES ON THE SUPPORT WALL OF THE SMOOTH BEARING ELEMENTS, THE ASSEMBLY IS SIGNIFICANTLY EASY AND THE CORRECT ASSEMBLY IS BETTER ASSURED BY THE FACT THAT EACH RETAINING DEVICE HAS AN ANNULAR DRAWING ELEMENT 15 ELASTICALLY PRELOADING, BEARING THE SMOOTH BEARING AND WHICH IS INSERTED IN A RADIAL CIRCUMFERENTIAL GROOVE 14 FORMED AT THE OUTSIDE OF THE SUPPORT WALL OF THE SMOOTH BEARING ELEMENTS 11, 12. THE ANNULAR DRIVE ELEMENT MAY BE FORMED BY AN ANNULAR DRIVE OF WHICH THE EXTRACTS ARE CONNECTED BETWEEN THEM OR BY A THREAD OF SYNTHETIC MATERIAL OR PIPE OF SYNTHETIC MATERIAL, WHICH CAN BE TENSIONED ELASTICALLY, OF WHICH THE END ARE WELDED EES TOGETHER.

Description

The invention relates to divided plain bearings, in particular

  big end bearings, for medium motors

  and large, in which permanent restraints

  nents used to hold the smooth bearing elements together and acting on their separation surface are provided directly in the support wall of the bearing elements

smooth, preferably in pairs.

  We know from DE-A 29 24 552 plain bearings

  divided in this species in which studs for assembly

  elastic cords similar to ankles are inserted at

  inside the support wall as retaining devices

  permanent nudes. However, these crampons require a dex-

  noticeable truth to be able to bring them into the locked position

  or release them again from this position.

  From DE-A 21 45 371 and 31 30 557, plain bearings are known in which are arranged, on the outer side

  of the support wall of the plain bearing elements, of the elements

  retaining elements, for example retaining brackets or Seeger securing rings which act on the separation surfaces of the plain bearing elements. The installation of such retaining elements, during the mounting of the

  plain bearing, is complicated, long and difficult, in part

  culier when the place of installation is relatively

difficult to access.

  By DE-A 31 30 557, he is also known

  improve the assembly of the plain bearing elements by

  further seeing, in addition to the retaining elements to be placed on the outside of the support wall, simple interlocking assembly elements, similar to plugs, inserted inside the support wall. It is true that

  these elements provide the plain bearing elements with a rete-

  bare mutual firm, but they require additional retaining elements and make it difficult to assemble

plain bearing elements.

  Relative to this, the invention aims to perfection-

  Significantly split plain bearings, especially big end bearings, for medium and large engines, on the remaining retainers for the detachable assembly of the plain bearing members, so that the retainers can be put in place place without difficulty and that the mounting of the plain bearing elements is not

  made difficult by these retainers.

  This problem is solved according to the invention by the fact that each retaining device has an elastically preloaded annular traction element, surrounding the

  plain bearing and which is embedded in a circumferential groove

  radial radial formed on the outside of the wall of

  support of plain bearing elements.

  This measure advantageously creates an auxiliary

  mounting link which keeps the bearing assembled when the bearing cover is fitted or when the connecting rod is dismantled. Another advantage is that during the change of the piston, the journal is protected against

soiling and damage.

  It has surprisingly appeared that such elastically preloaded annular traction elements, surrounding the plain bearing, are particularly easy to place on the outside of the support wall of the plain bearing elements and can be embedded in grooves.

  annulars all around the circumferential surface-

the smooth bearing.

  In particular the insertion of plain bearing elements between the bearing housing and the journal, for example

  of a crankshaft, is not made difficult by such elements.

  all around. On the contrary, one can, already before the insertion of the plain bearing element, insert

  the traction element in the outer groove thereof.

  The annular traction elements surrounding the plain bearing

  in this way, while having a simple and light constitution-

  re, are all the same suitable for exerting a significant retaining force and tensile force on the plain bearing elements, so that the plain bearing elements are already securely held together and fixed, only by the or

  the traction elements surrounding the plain bearing with pre-

elastic load.

  In a preferred embodiment of the invention, the traction element can be closed, at its ends, in a closed ring. As a result, the traction element, in the still open state, can be wrapped around the trunnion to be mounted or the shaft to be mounted and, before the introduction of the plain bearing elements, be closed in a ring in which then introduces the plain bearing elements, - with the groove provided on the outside of the support shell. The traction element can be formed by a coil tension spring. It is also possible to form the traction element starting from a plastic thread - or a plastic pipe that can be stretched elastically in its

  longitudinal direction. In the latter case, it is necessary to use

  be of synthetic material which can be welded so that the ends of the plastic wire or pipe forming the element of

  can be welded together.

  Preferably, the radial grooves or grooves

  are provided with at least one lifting groove extending axially

  relative to the front side of the plain bearing. Thanks to

  of this lifting groove, one can act from below the element

  pull with a tool and lift it out of

  the housing groove extending all around the plain bearing.

  If the traction element is formed by a plastic pipe or wire, instead of the lifting groove, an access groove can also be provided cutting the groove of

  housing of the traction element, so that

  near the traction element, in transverse direction,

  a cutting tool, for example a knife, for cutting the element

  pull to detach the retainer.

  It is particularly advantageous, in the context of the invention, to combine the tension element stretched over the outer circumferential surface of the plain bearing with at

  minus a direct fitting interlocking element-

  in the wall of the plain bearing elements, which is con-

  seen in the manner of an anchor inserted with tight adjustment in tangential direction in the wall of one of the plain bearing elements and which, beyond the separation surface, engages with sliding adjustment in a recess arranged in tangential direction in the wall of the other plain bearing element. These interlocking connecting elements not only prevent any axial and radial relative movement between the plain bearing elements but also form, moreover, a reliable guide device for the tightening of the plain bearing elements by the traction elements. pre-

  resiliently loaded. Since these elements of trac-

  tion and plug-in coupling elements are arranged parallel to each other in the region of the separation surfaces, the guiding function exerted by the coupling elements acts so that the plain bearing elements are tightened together

  by the traction element (s) until their

  dividing faces are applied exactly one against the other.

  Exemplary embodiments of the invention are explained.

  qués more specifically below in connection with the drawings, in which: Figure 1 shows in side elevation a plain bearing according to the invention with a pair of traction elements;

  Figure 2 shows the plain bearing as shown in Figure

  gure 1 in partially uprooted front elevation; Figure 3 shows the region 3 of Figure 1, in enlarged representation and in a modified embodiment, and Figure 4 is a partial sectional view along

line 4-4 of figure 1.

  The execution examples shown are

  smooth links in two parts, namely connecting rod bearings 10 which are, in particular, designed to be pressed between the considered journal part of the crankshaft and the

  bearing housing considered, after the introduction of the

  brequin in the corresponding bearing housings. The two plain bearing elements 11 and 12 have, at the outer circumferential surface of their support wall 13, a pair of annular grooves 14 extending parallel to each other and parallel to the front sides of the bearing. In each of these annular grooves 14 is inserted an elastically preloaded annular traction element 15 which annularly surrounds the entire plain bearing 10. In the example of FIGS. 1 and 2, the annular traction element is formed by

  a coil tension spring 16 whose regions terminated

  can be screwed together to form a closed ring.

  In order to be able to lift the traction elements 15 out of the annular grooves 14 in order to release the retaining device thus formed, each annular groove 14 is connected to a

  lifting groove 17 which extends to the front side consi-

  dere 18 of the bearing element considered 11, 12 and pre-

  feels practically the same depth as the annular groove 14. The lifting groove 17 can be relatively flat in the region of the front side 18 and adapt, up to the annular groove 14, to the depth thereof. Although on the

  Figure 1 lifting grooves 17 are only shown

  tees on the plain bearing element 12, each of the two plain bearing elements 11 and 12 may have such lifting grooves. Possibly even, several lifting grooves are

distributed around the circumference.

  In the example of FIG. 3, the traction element is formed by an elastic wire of synthetic material 19 which can be welded, the ends of which are welded together at 19a. This synthetic material wire 19 is also preloaded in its longitudinal direction. To remove this retainer, it is not necessary to lift it out of the

  annular groove, because for simplicity, it is cut.

  During the renewed mounting of the bearing, a new plastic wire 19 is used to form the traction element.

  Instead of the plastic thread 19, we can

  Also use a plastic pipe to form the traction element 15, the ends of the plastic pipe can be welded together to

form a closed ring.

  When using a traction element which must be cut when releasing the retainer, instead of the lifting groove 17, an access groove can be provided, for example a knife guide groove, which cuts the annular groove and possibly still has

  a slightly greater depth than the annular groove 14.

  The depth of the annular grooves 14 is such that the traction element housed by each annular groove

  is fully inserted into it.

  As can be seen in FIG. 2, the connection point 16a, 19a of the traction elements 16, 19 is offset by an angle relative to the separation surfaces 21 of the plain bearing elements 11 and 12, for example of a

45 angle.

  As can be seen in Figures 1, 2 and 4, in a particular embodiment of the invention, it is

  planned to combine the traction element 15 stretched over the

  outer circumferential face of the plain bearing 10 or the pair of traction elements 15 with at least one interlocking connection element 22 disposed directly in the support wall of the plain bearing elements 11 and 12. Preferably, at each surface of separation 21 is provided a pair of these interlocking connecting elements 22. The interlocking connecting elements 22 have the shape of a pin extending in tangential direction which, by one end, is inserted with tight fit in the support wall of one of the plain bearing elements, for example of the element 11, and engages with sliding adjustment, beyond the separation surface 21, in a recess 23 formed in a tangential direction in the wall of the other element of

  plain bearing, for example of element 12.

  Although, according to the representation of FIG. 1, the width of the annular groove 14 can be adapted to the thickness of the traction element 15 so that the traction element 15 already prevents significant relative axial sliding of the bearing elements 11 and 12 at their separation surface 21, the interlocking assembly elements 22 still offer improved lateral retention and guidance

  elements 11 and 12 against each other and above all, generate

  shear actions in the region of the separation surfaces 21, by the lateral surfaces of the grooves

  annulars 14 on the traction elements 15 inserted.

  For mounting a plain bearing according to Figures 1 to 4, for example on a crankshaft, first close

7 2588333

  annularly around the plain bearing 11, in the region of the

  part of tree or trunnion each time surrounded by it

  ci, the traction elements 15 necessary for the plain bearing.

  Then, there are the plain bearing elements 11 and 12 between the crankshaft part considered and the elements of

traction 15.

-RE V E N D I C A T I ONS-

  1. Split plain bearing, in particular connecting rod bearing, for medium and large engines, in which permanent retaining devices serving to hold the plain bearing elements together and acting on their separation surface are provided directly in the wall support of the plain bearing elements, preferably in pairs, characterized in that each retaining device has an annular traction element (15) elastically preloaded, surrounding the plain bearing (10) and which is

  embedded in a circumferential radial groove (14) for-

  from the outside of the support wall of the

plain bearing (11, 12).

  2. Bearing according to claim 1, characterized in that the traction element (15) can be closed, by its

ends, in a closed ring.

  3. Bearing according to any one of the claims

  1 and 2, characterized in that the traction element (15) is

  formed by a coil tension spring (16).

  4. A bearing according to any one of the claims

  1 and 2, characterized in that the traction element (15) is formed from a plastic wire (19) or a plastic pipe, which can be stretched elastically in

its longitudinal direction.

  5. Bearing according to claim 4, characterized in

  that the synthetic material is weldable.

  6. Bearing according to any one of claims

  1 to 5, characterized in that the radial annular grooves

  (14) are provided with at least one lifting groove (17) extending

  axially relative to the front side (18) of the bearing

smooth (10).

  7. Bearing according to any one of the claims

  1 to 4, characterized in that the radial annular groove (14) is provided with at least one access groove (20) which

chopped off.

  8. A bearing according to any one of claims

  1 to 7, characterized by the combination of the trac-

  tion (15) stretched over the outer circumferential surface

9 2588333

  of the plain bearing (10) with at least one interlocking connection element (22) disposed directly in the wall of the plain bearing elements (11, 12), which is designed in the manner of an inserted pin with tight fit in tangential direction in the wall of one of the plain bearing elements (11 or 12) and which, beyond the separation surface (21), engages with sliding adjustment in a recess (23) arranged in tangential direction in the wall of the other

  plain bearing element (12 or 11).