DE1627716A1 - Procedure for assembling a lower shaft bearing shell and device for carrying out the procedure - Google Patents

Description

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AKTIESELSKABET BTIRMEISTER & WAIN'S MASKIN- OG SKIBSBYGGERI, Copenhagen, Denmark,

Method for assembling a lower shaft bearing shell and device for carrying out the method.

The invention relates to a method for assembling a lower shaft bearing shell without removing the Wave. This process can be used, for example, when changing bearing shells for crankshafts in large diesel engines and others heavy machinery can be used to advantage. The overhaul and maintenance of such machines is often a part of it Removing and checking the bearing shells, which usually consist of an upper bearing shell and a lower bearing shell exist with a horizontal dividing surface.

After removing the lower bearing shell, the weight of the shaft and any machine parts mounted on it cause the shaft j L · to bend. that makes the subsequent insertion of the bearing shell without the · * · * use of special aids difficult or even completely ^

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Α * Is i§f feefcaönt, ܧ files Hit Help eiftelP itg, die z * Ü * Gegeisen feäfei * ta SöSeftrahm @ iis the machine is supported> to raise. Has proceeded hazily the disadvantage) that the attachment of the healing device with Öeüft associated auxiliary tool is time-consuming and that it is in particular no longer possible to close the shaft turn, which would make it easier to insert the lower bearing shell.

It is the purpose of the invention, by specifying a simplified method that is faster and with simpler Tool is to be carried out to remedy this and other disadvantages. This is achieved according to the invention in that as a forerunner for the. Bearing shell a wedge-shaped ring segment tangentially with the thin end first in the space between the bearing surface of the shaft and the stationary part of the bearing in which the bearing shell is to rest is introduced.

When using such a method, it is achieved that when the ring segment is inserted, the bending of the Shaft is eliminated gradually, so that the lower bearing shell in continuation of the., ring segment can be attached unhindered in place.

iErrfindungsgemäss one proceeds preferably so that <is the shaft rotated during the insertion of the wedge-shaped segment ', and the mounting läss | i to-inventively by alder?> iOht§rn, _i .that .while the insertion of the segment and / or the lower bearing shell of the wing of the stationary part of the i, ager! s lubricant ... s

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According to the invention, a ring segment is preferably used whose thickness at the thin end is at most equal to the normal clearance between the bearing surface and the supporting surface of the stationary part of the bearing, reduced by the deflection of the shaft , and whose thickness at the thick end is essentially the thickness of the bearing shell is equivalent to.

The invention also relates to a device for carrying out the method, which is characterized in that it comprises a wedge-shaped ring segment, the inner and outer diameter of which mainly corresponds to the diameter of the bearing surface of the shaft or the supporting surface of a stationary bearing part in which the bearing shell is to rest > and whose thickness at the thin end is at most equal to the normal clearance zv / inchrn of the bearing surface and the supporting surface of the stationary part of the bearing, reduced by i; .e deflection of the shaft, while the thickness of the segment at the thick end is essentially the thickness of the bearing shell is equivalent to.

According to the invention, the device also comprises: preferably, a driver which is set up to be attached to the crankshaft and has an engagement surface for interaction with a bearing shell attached behind the segment. This allows the segment and the following lower bearing shell to be introduced easily and unhindered between the stationary part of the bearing and the shaft ^{by slowly turning the crankshaft "T} " **.

The invention is hereinafter referred to as reference av ~

OQ9833? OES2 BAD ORIGINAL

the schematic drawing explains in more detail. The drawing shows an image, partially in section, perpendicular to the axis; a crankshaft of a diesel engine and the essentials Elements of an embodiment of the invention Contraption.

The crankshaft illustrated in the drawing, the cut main bearing journal of which is denoted by 3, rests during normal operation of the engine in a main bearing, which consists of a lower bearing shell 2 and a nichi shown. ''

upper bearing shell consists. Usually the bearing shell rests 2 in a corresponding, essentially semicircular cylindrical recess in the base plate 5 of the motor, while the upper bearing shell, not shown, is held by a bearing cover which is attached to the Base plate 5 is attached - When dismantling the bearing shells the upper bearing shell is removed first and then the lower bearing shell removed, which after the im

Patent .. (Application No. A 52012 Ic / 3? 0 described

Procedure can be done.

When the bearing shells are to be mounted _again} the crank shaft has a smaller distance than are normally inserted from the cylindrical bearing surface in the base plate 5 and the bearing shell 2 may therefore Not ^J · readily into the gap due to their deflection. According to the invention, a wedge-shaped ring segment I _{5 is used as an aid for introducing the bearing shell}

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whose inner diameter mainly corresponds to the diameter of the bearing surface of the main bearing pin 3, during the outer diameter of the segment is equal to the diameter of the wing in the base plate 5. However, the segment is as I said, wedge-shaped and whose thickness t is at the thin end equal to the smallest size or slightly smaller than that smallest size of the space mentioned, i.e. the thickness of the lower bearing shell 2 reduced by the aforementioned Deflection of the shaft. The thickness T of the segment 1 on the thick End preferably corresponds to the thickness of the lower bearing shell shown 2. In other words, the radial wedge pitch of segment 1 equal to the deflection of the shaft with the lower bearing shell removed.

For inserting the wedge-shaped segment 1 and the lower bearing shell 2 immediately behind it A driver 7 is used, which as shown on the indicated by dashed lines and adjacent to the main bearing pin 3 Crank web S can be clamped. This driver has an attack surface on the free edge of the lower Bearing shell 2 can rest, i.e. "on the edge that is attached to the Segment 1 abutting end of the lower bearing shell is diametrically opposed, and when the crankshaft is slowly in the is rotated by the direction indicated by the arrow shown, the auxiliary segment 1 and the bearing shell 2 at the same time gradually raising the crankshaft in the space between the pin 3 and the base plate 5 introduced.

009833/0552

In view of this, to facilitate insertion of the segment described and the lower bearing shell, one can pumping during the rotation of the crankshaft oil between the support surface of the base plate 5 and the outer sliding surface of the segment. 1 The drawing shows a single oil hole 6 in the base plate 5 for pumping in lubricating oil

with suitable pressure. It is evident that, depending on the circumstances, several such oil supply channels in can be appropriately distributed over the storage area, and that the pumping in of OeI depends on the gradv / ice-n Insertion of the ring segment 1 between the bearing pin and the base plate can be controlled.

To guide the bearing shell 2 during the

described process can serve a bearing cover 9, which with the help of the bolts 10, which during normal operation of the motor hold the bracket of the upper bearing shell, not shown, is clamped to the base plate 5.

009833/0552

Claims (7)

P a t e η t a η s ρ r ü c h e. 1.} Procedure for the! ⁵ CTtHr-P a lower shaft bearing shell without removing the shaft, characterized in that as a precursor for the bearing shell a wedge-shaped ring segment tangentially with the thin end first in the space between the bearing surface of the shaft and the stationary part of the bearing in which the bearing shells should rest, is introduced. 2. The method according to claim 1, characterized in that the shaft is rotated while the wedge-shaped segment is being retracted. 3. The method according to claim 1 or 2, characterized in that during the insertion of the segment and / or the lower bearing shell of the fragile surface of the stationary part of the bearing, lubricant is supplied. 4. The method according to claim I ₃ 2 or 3, characterized in that a -RiniErsefrm ^ nt is used, the thickness of which at the thin end is at most equal to the normal clearance between the bearing surface and the support surface of the stationary part of the shaft reduced by the deflection The bearing is and its thickness at the thick end essentially corresponds to the thickness of the bearing shell. 5 The device for carrying out the method according to any one of claims 1-4, characterized ere. Characterized in that it comprises a wedge-shaped ring segment (1), the inner and outer diameter of which is mainly the diameter of the bearing surface (3) of the shaft or the supporting surface of a stationary 009833/0552 BATH tf Bearing part (5), in which to rest the lower Lagersehale (2) _s and the strength of {t) at the thin end at most equal to the deflection of the shaft reduced normal clearance between the bearing surface and the support surface of the stationary part of the bearing is _s while the thickness (T) of the segment at the thick end essentially corresponds to the thickness of the bearing shell [Z). 6. ¥ device according to claim 5, characterized in that it comprises a driver (7) which is set up for fastening to the crankshaft (3) and has an engagement surface for cooperation with a bearing shell (2) attached behind the segment, 7. Apparatus according to claim 6 _3, characterized in that it has organs (9) for guiding the bearing shell (2) during its rotation with the aid of the driver (7). Ö. Device according to claim 5 ₅ 6 or 7, characterized by elements (6) for introducing lubricant between the facing surfaces of the stationary part (5) of the bearing and of the segment (1) and the bearing shell (2). 009833/0 B-S 2