FI58966C - MASKINELEMENT T EX ETT VEVSTAKSLAGER - Google Patents

Description

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Patent and Registry Administrators .............,. ,,,. .

_ *. (44) Date of issue. -

Patent and registration authorities Ansöksn utlugd och utUkrtftun pubikurtd 30.01.8l (32) (33) (31) hrdstty utuolkuut — augird prtorltut 23.09.71+

France-France (FR) 71 + 31997 (71) Soci ^ te d'Etudes de Machines Thermiques SEMT, 2, Quai de Seine, 93202 Saint Denis, France-France (FR) (72) Jean-Louis Magnet, Saint Germain en Laye, France-France (FR) (7¾) Oy Borenius & Co Ah (5I +) Machine body, eg connecting rod bearing - Mask element, t.ex. to vevstakslager

The invention relates to a machine member with at least two interconnected parts which form a through hole for a shaft subjected to transverse stress, e.g. a shaft for a connecting rod. This machine member consists of at least two assembled parts which are clamped together by two connecting bolts, which are substantially perpendicular to the joint.

Such a machine element is already known from DT-PS 83 0. ++ 43. The central region of the joint of this structure has a notch which reduces the surface area of the joint in this central region and which achieves a higher load on the edge areas. Such a load distribution is particularly advantageous in crankshaft bearings due to the load distribution present in the split shaft bearings for the reasons detailed in this patent.

However, the disadvantage of this structure is the making of a notch in the joint surface itself, since this notch reduces the load-bearing joint surface and thus the load-bearing capacity of the joint. In this known structure, a fitting pin placed in the seam, the function of which is to prevent the mutual movement of the opposite seam surfaces, cannot overcome this disadvantage. This pin cannot be used to transmit the compressive stress for the reason that the load would not be removed from the center of the seam.

2 58966 A further disadvantage of this known structure is that at least two radially pipe bores inside and outside the notch have to be used per seam to tighten the seam only in those end areas where the seam surfaces press against each other. This disadvantage is particularly serious in motor designs, as conventional tightening of the bearing with only one bolt per seam cannot be applied. In addition to the difficult installation, the complicated storage is also a disadvantage.

However, it is not possible to use a known structure with only one clamping bolt, because the detachment generated by one bolt leading to a reduction in the load on the end areas of the joint would increase in this known structure. A central notch in the seam surface would increase the detachment and rise of the seam end regions from each other.

The object of the invention is to provide a machine member of the type mentioned at the beginning, in which one single bolt per seam is handled, but still the advantageous loading conditions of the known structure are maintained.

This object is solved according to the invention in such a way that at least one end of at least one of said parts has at least one oval, round or elliptical hole made in the middle part of the respective seam surface, preferably approximately parallel to this surface. One or more holes made in the middle of the seam in the vicinity of the seam surfaces deform when the bolts are tightened and lead to a reduction in the load in the middle of the seam and thus to the desired advantageous load distribution in the joint. Nevertheless, the entire surface of the joint seam remains unchanged and is available to prevent the mutual movement of both surfaces of the seam, and these seam surfaces can still contribute to carrying a considerable part of the load. Thus, a structure is obtained which is superior in load characteristics to the known structure, and which is still conventionally handled by a single bolt per joint. The structure according to the invention can thus be subsequently adapted to older machines in an arbitrary manner, and even the installation instructions do not need to be changed. Manufacturing is also considerably simpler compared to the known structure, since only one drilling has to be done on a full-length material, which does not require any special precision.

The invention is explained in more detail below on the basis of the accompanying schematic drawing.

3,58966

Figure 1 shows a section of the connecting rod body and the connecting rod head cover in the assembling position. The end part of the body of this connecting rod is shaped according to the invention.

Figure 2 is a sectional view of a cover shaped according to the invention of the end of a connecting rod.

Figure 3 shows a section taken at line II-II in Figure 2.

Figure 1 shows the end part of the connecting rod body 11 in the position in which it is connected to the corresponding cover 12 of the connecting rod end. The bores 20, 21 of the body 11 and the bores 22, 23 of the cover are made to accommodate connection bolts (not shown). The respective connecting surfaces 13a, 14a, and 17a, 18a of the end portions 13, 14 and 17, 18 have grooves 24 which, in cooperation with each other, absorb the shear stresses applied to the rotating rod during its operation.

The invention, which makes the compression pressure more evenly distributed, is based mainly on a simple hole 25 made in the end part 13 close to its connecting surface 13a approximately parallel to the longitudinal center line 10 of the rotary rod end bore 16. This hole can be round, oval or elliptical in shape, and its main purpose is to provide a less rigid zone in the middle of the respective joint surface so that the compressive stress is equalized over the entire joint surface.

Figures 2 and 3 show the same type of connecting rod head cover as Figure 1, and similar parts are denoted by the same reference numerals. The only difference is that the weakening hole 25a is now made in the connecting rod head cover 12 near the connecting surface 17a of the part 17. In this connection, it should be noted that these two alternatives to the embodiment of the invention shown in Figures 1 to 3 do not limit the invention in any way, but that the number of holes made, the possible different shapes of these holes and their relative positions at said different extremes 13,