DE7342154U - Reciprocating internal combustion engine - Google Patents

Description

II · · I

Maschinenfabrik Augsburg-Nürnberg Aktiengesellschaft 8900 Augsburg, Stadtbachstrasse 1

Gm. B. 1185 Augsburg, November 26, 1973 Reciprocating internal combustion engine

The innovation relates to a reciprocating piston internal combustion engine, in particular a large diesel engine, with a consisting of several parts the mesh housing, which is connected to one another via tie rods are.

From DT-PS 1 050 600 a machine housing is known in which the upper part of the housing with the lower part of the housing is perpendicular the tie rod arranged to the housing separation joint is connected «From DT-PS 1 268 901 an arrangement can also be taken in which the lower bearing cover of a crankshaft bearing with the help of clamping screws arranged perpendicular to the bearing separation joint is set against the upper bearing cap.

With arrangements of this type there is a risk that the tie rods by dynamic movements of their clamping surfaces or by Gas and inertia forces caused vibrations in the walls of the machine housing are excited to vibrate This is particularly

it is unpleasant when the introduced oscillation excitation frequencies includes that with the natural bending frequency of the relevant Tie rods match · As a result of the resonance-like reinforcement, the tie rods vibrate so strongly that bending fatigue breaks are to be feared. It should also be noted that such tie rods are subject to constant, low-frequency bending or elongation are subject to which should be able to develop unhindered to avoid signs of wear and tear.

Here vol. It is the task of the present innovation, in a simple way to enable extensive damping of the vibrations of the tie rods, without low-frequency deformations of the To hinder tie rods.

The object is achieved according to the invention in that the tie rods are surrounded at least over one part of their length by an annular gap which is filled with a damping material. The Verdrafger effect of the moving tie rod in the annular gap leads to a counterforce of the filled medium, which increases rapidly especially with fast ren movements, i.e. higher-frequency vibrations and thus has a strong dampening effect on natural-frequency vibrations. In contrast, low-frequency deformations of the tie rods, such as bends or elongations, can develop largely unhindered . In contrast to a firm fixation of the tie rods in the housing, for example with the help of visual screws that are printed across the shaft, any frictional wear caused by relative movements is eliminated from the start.

In internal combustion engines, lubricating oil is preferably used as the damping material, which is appropriate for the rings the central oil supply is continuously supplied and can escape from the tank via a target leakage point. A lubricating oil circuit is already available in internal combustion engines, so that the invention can be implemented with relatively little effort.

In a simple embodiment, the 4-way annular gap is formed by a bore hole through which the Zaganker is guided. The effort involved in forming the ring pelta is extremely low, because the ring pelvis, for example, in the Bert-ich der

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Further features and distributions of the arrangement described at the beginning can also be found in the description of some design elements attached to the drawing in conjunction with the real ones

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Figure I.

the fastening of a cylinder block in the Oe β sub-part of a V-engine,

Figure 2

the definition of a lower crankshaft bearing cap on the bearing housing,

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Figure 3 is a horizontal section through a

so-called stand cannon, in which a tie rod is laid,

Figure 4 is a vertical section along the Line IV-IV in Figure 3 and Figure 5 shows a detail from Figure 4 in ver

larger representation.

In FIG. 1, 1 denotes a cylinder block which is fixed to the frame lower part 4 of a V-machine with the aid of tie rods 3 arranged perpendicular to the frame parting line 2. The tie rods 3 are laid in recesses 5 of the cylinder block 1, which can preferably be provided when this part is being cast. In the middle area of the recesses 5, an annular gap 6, produced in the present example by a narrow bore, is provided. To dampen the vibrations transmitted from the cylinder block 1 and the frame base 4 to the tie rods 3, a tough or viscous medium is present in the annular gap 6, which the tie rod 3 in question must displace in the event of vibrations. In the present example, a highly viscous silicone oil is used as the damping material, which is filled into the closable recesses 5 and thus also fills the annular gaps 6. To achieve a sufficient displacement effect, the gap thickness of the annular gap 6 is about 2% - 8 %, preferably 5 % of the shaft diameter of the associated tie rod 3. A gap length that is at least three to four times the shaft diameter.

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knife of the associated tie rod 3, results in a sufficient Supportive effect.

In the exemplary embodiment shown in FIG. 2, 10 designates a lower bearing cover for hanging a crankshaft 11, which is fixed with tie rods 13 arranged perpendicular to the bearing separation joint 12 on the upper bearing cover 14. The tie rods 13 are designed as expansion screws in the present example, which are laid in recesses 15 of the bearing cover. About in the middle In the region of the shaft length, the tie rods 13 are provided with a cylindrical fitting piece 16 which is used to form an annular gap 17 is expediently passed through a mechanically produced bore with play. The recesses 15 and thus also the associated annular gaps 17 are in the present example to bring about a damping of the vibrations of the tie rods 13 with a tough foam, for example polyurethane foam, foamed up. By using a foam with open cells, it consists Here, too, the possibility of additionally filling a viscous liquid, for example oil, into the recesses 15. The embodiments corresponding to the type described above, in which the recesses receiving the tie rods are entirely covered with a damping medium are filled, are suitable with regard to the consumption of damping material and the sealing of the recesses especially good for smaller tie rods.

At very large. As can be seen from FIG. 3, motor frames are, in particular, the frame tie rods laid in so-called stand cannons. In Figure 3, 20 denotes a housing part, which with the help of a

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Tie rod 21, which is passed through a stand cannon 22 is connected to another component. To form an annular gap 23, the tie rod 21 is surrounded by a sleeve 24 which is supported in the axial direction on a shoulder 25. How best As can be seen from FIG. 4, the sleeve 24 is fixed radially in the rod 22 with the aid of fixing screws 26. Preferably three fixing screws 26 offset from one another by 120 are provided on the circumference. The annular gap 23 is at the ends of the sleeve by a ring pushed over the tie rod 21, movable to a limited extent in the sleeve 24, preferably inwardly tensioning ring closed. In Figure 5 is an advantageous embodiment of a such ring arrangement shown. The ring 27 is preferably designed as a double ring. As a material come about plastic or Steel in question. The ring 27 is advantageous with radial play in a groove 28 of the sleeve 24, which is open on one side, is inserted. As a result, movements of the tie rod 21 are not hindered. The groove 28 is closed by a screwed-on ring 29. In the present Example should be used as a damping medium pressure oil. The annular gap 23 is for this purpose, as can be seen from Figure 4, through a pressure oil supply line 30 is constantly supplied with pressure oil, preferably from the lubricating oil circuit. The sealing of the annular gap 23 in The area of the rings 27 represents what is known as a target leakage point. Leakage oil that escapes through the seal runs by itself back into the oil container in the base frame. By using of lubricating oil as a damping material, the invention can be implemented in a particularly simple manner, since as a rule pressure oil from Sufficient lubricating oil circuit made available will. In the examples described above, it would be useful to

Application of prints: only necessary, the annular gaps 6 and 17 over To connect pressure oil supply lines with the oil circuit.

Claims (1)

- 8 claims 1. Reciprocating internal combustion engine, especially large diesel engine, with a machine housing consisting of several parts, which are connected to one another via tie rods are, characterized in that the tie rods (3, 13, 21) at least over part of their length of one Annular gap (6, 17, 23) are surrounded, which is filled with a damping material. 2. Reciprocating internal combustion engine according to claim 1, characterized in that the annular gap (6, 23) is sealed. 3 _S reciprocating internal combustion engine according to claim 2, characterized in that lines (30) are provided for the continuous supply of lubricating oil to the annular gap (23). 4. Reciprocating internal combustion engine according to one of the preceding claims, characterized in that a target corner point is provided in the region of the annular gap (23). 5, reciprocating internal combustion engine according to claim 1, characterized in that the annular gap (17) is foamed with a foam material · ι · r · ♦ < • Γ · 6. Reciprocating internal combustion engine according to at least one of the preceding claims, characterized in that the gap thickness of the annular gap (6, 17, 23) is about 2% - 8% of the shaft diameter of the tie rod (3, 13, 21). 7. Reciprocating internal combustion engine according to at least one of the preceding claims, characterized in that the length of the annular gap (6. 17. 23) at least three times of the shaft diameter of the tie rod (3, 13, 21). 8. Reciprocating internal combustion engine according to at least one of the preceding claims, characterized in that the annular gap (6, 17, 23) is provided approximately in the middle between the points of application of the tie rod (3, 13, 21) is. 9. Reciprocating internal combustion engine according to at least one of the preceding claims, characterized in that the annular gap (6, 17) is formed by a hole in the housing through which the tie rod (3, 13) is passed is. 10. Reciprocating internal combustion engine according to at least one of the previous Anspi. See 1 to 8, characterized in that that a sleeve (24) which can be pushed onto the tie rod (21) is provided to form the annular gap (23). V- k · »· I I Reciprocating internal combustion engine according to claim 10, characterized in that characterized in that the sleeve (24) can be fixed radially in relation to the housing (20) with the aid of clamping means (26) is. Reciprocating internal combustion engine according to claim 10 or 11, characterized in that the annular gap (23) at the axial ends of the sleeve (24) by means of a radial movement of the tie rod (21) permitting sealing elements (27) "can be opened.