DE1576407B2 - PROCEDURE FOR INCREASING THE HEAT TRANSFER AND AVOIDING FITTING RUST IN THE CYLINDER LINES OF INTERNAL ENGINEERING MACHINES AND CYLINDER LINERS TO PERFORM THE PROCEDURE - Google Patents

Description

3 4

deformation of the spaces occurring in the same rhythm, which is caused by the periodically occurring

Cylinder liner or the engine block is generated, the engine block is formed, nothing more

by which the separating agent from the broader fissure parts is detrimental, on the contrary, they excite the pulsating

len pressed into the narrower gap parts and flows back in, thus increasing the heat transfer

is squeezed out. A kind of pumping action arises. Continue by making the grooves

through which a constant movement of the separating agent makes the cylinder liner more elastic, it adapts to

tels and a closed film layer on the whole better to all deformations. The manufacturing

Fit gap is secured. 'The effort is also considerably lower, since the

As a further development of the invention, there is no need for thorough grinding and honing, on the contrary, Implementation of this method proposed that on io there are even not smooth contact surfaces and a the outside of the cylinder liner in itself greater play between the wall of the cylinder bead Wise guideways in the form of cones and the cylinder liner aimed at. Locking centric Grooves with longitudinal connections or borrowed must still be regarded as advantageous that Longitudinal grooves or single or multiple threads through the closed oil layer in the fit threads are incorporated. Through these grooves, a damping of the body shell, especially, is achieved a more even distribution of the release agent also eliminates the odor that occurs when the piston is tilted, then evenly into the narrow space, which is known to be one of the most important noise spaces is pumped. represents swelling in piston engines, results.

It is noted that the arrangement of lowering In the drawing is an embodiment of the right, concentric or thread-like running ao invention and is briefly grooved below between the cylinder and the cylinder liners:

Bush already many times, for example through the In a cylinder bore of an engine block 1 is

German Patent 409 617 is known. Such a cylinder liner 2, in which a piston 3 is

term grooves are also slidably arranged for the passage of oil, used with play. At the

is used, but in contrast to the present 25 entire outer surface of the cylinder liner 2

Invention, a thread-shaped groove is always provided as a guide track 4 for cooling the cylinder barrel.

area. The grooves are therefore also see correspondingly large, which has a certain slope. That

designed and take up almost the entire outer upper end of the groove with one in the engine block 1

surface of the cylinder liner. arranged inlet hole 5, the lower end with

As a result of the design according to the invention, the 30 is connected to an outlet 6. About the Zulaufboh task fully resolved. Essential for a good tion 5, the groove oil is supplied, which fills. from Heat transfer and the prevention of rust formation - the groove penetrates the oil through the capillary formation, thereby a slight dismantling of the cylinder liner, reinforced by the during the engine operation Even after many hours of operation, the pumping effect still occurs visibly in the rooms is, the always closed film 35 see the groove, so that a closed film is stripped, the ongoing adjustment of the film thickness is pending. Finally it enters through the outlet 6 the respective gap width in the event of deformations in the crankcase or in the machine's oil pan, torblockes or the cylinder liner and the lukewarm A renewal of the oil is only necessary to the extent that it is necessary Renewal of the release agent, which is therefore necessary, as signs of aging show. One always serves as a good heat transfer medium. 40 Regulation takes place through suitable dimensioning of the Finally, the heat transfer is determined by the play or the depth of the grooves and their number Squeezing pressure generated during engine operation or with the aid of the oil inlet pressure, which is still significantly increased in the case of combustion flows. engines in general with the engine speed

In addition, there are a number of other numbers and thus also proportional to the possible

Advantages. For example, the formation of cavities increases.

1 sheet of drawings

Claims (5)

1 2. Zen. As a release agent, lubricating oil or a solid-type body lubricant based on ■ graphite or MoS2 is used. Such liners are »Slipfit- 1. Method for enlarging the heat transfer sleeve "called. ganges and to avoid fretting corrosion at 5 In the meantime, however, it has become clear that Cylinder liners of internal combustion engines, such cylinder liners some serious which cylinder liners adhere to disadvantages when using them. This is particularly evident in that of liquid release agent in the fitting gap between the cylinder bore and the outer surface see engine block and cylinder liners built in a separating agent provided for the cylinder liner are, characterized in that io follow the operating conditions proportionally that the release agent quickly shows signs of aging during operation. Further sets Internal combustion engine through the fitting gap or it collects at certain local limits and through over the entire th places and acts through the advancing length alternately differently large decomposition or coking no longer as thermal insulation of the fitting gap in a partially strö- 15 carrier, but as an insulator. The consequence of this is that and a partially pulsating movement is displaced between the cylinder bore and the cylinder so that a closed film liner apart from a partially metallic contact layer The surfaces are isolated by the release agent on the entire mating surface. effective spots, air gaps and, in some cases, frictional 2. The method according to claim 1, thereby forming rust. This creates a bad heat label, that as a release agent, as in itself transfer from the cylinder surface over the known for cooling cylinder liners, engine block to the cooling water. Through the rust pictures Oil, which is used to lubricate the machine, is also used after some operating time is used. still impossible to get the cylinder liner 3. To expand the cylinder liner undamaged to carry out the 25, so that the actual method according to claim 1 or 2, thereby ge purpose of the release agent is missed.
indicates that on the outside of the cylinder, the formation of an engine block for derlaufbuchse (2) in a conventional manner, high-performance internal combustion engines, in particular guideways (4) in the form of concentric grooves when used in vehicles, are not so stiff with longitudinal connections are incorporated. 30 and it is difficult that the operational 4. Cylinder liner to carry out the claims no deformations of the same and Method according to Claim 1 or 2, characterized in that the cylinder bores also occur. Because it indicates that it is not possible to manufacture cylinder liners on the outside of the cylinder, derlaufbuchse (2) in a manner known per se which completely follow these deformations Guide tracks (4) in the form of longitudinal grooves 35 are also unfavorable heat pockets that damage are incorporated. on pistons and piston rings. 5. Cylinder liner for carrying out the Finally it must be mentioned that the so-procedure according to claim 1 or 2, characterized in that said "slip-fit sleeve" has a very high level of production, that requires on the outside of the cylinder accuracy. To a reasonably befriediderlaufbuchse (2) To achieve 4 ° low operating behavior in a known manner is a loop guideway (4) as single or multi-start fen and honing their outer surface and the wall threads are incorporated. indispensable for the cylinder bore. The object of the invention is to find a means and a way find out how these disadvantages in a cylinder barrel ■. '45 socket of the type described above if possible can be avoided, but in particular should The invention relates to a method for increasing a greater heat transfer from the cylinder liners of the heat transfer and to avoid bushing achieved on the engine block and the formation of fretting rust in cylinder liners can be avoided by fretting rust.
Internal combustion engines and the cylinder liner for 50. According to the invention, the object is thereby carried out the process, which cylinder barrel solves that the release agent during operation of the bushes using liquid Trennmit- internal combustion engine through the fitting gap behind in the fitting gap between the engine block and cylinder and carried out by being built in over the entire length of the condenser bushing. alternately differently sized training of the Pas cylinder liner, which is set almost with its entire sungsspaltes in a partially flowing and a th outer surface directly on the wall of the cylinder- partially pulsating movement, so that the bore in the engine block are closed, have long been closed Film layer is known throughout the pas and belong to the general state of the solution area being formed. Technology. They are used in particular in As a release agent, as in itself, it becomes a cooling block engine compared to the previously known, 60 ment of cylinder liners known to the Oil that is used to lubricate the machine is used directly from the cooling water. It very small cylinder distances. is through an inlet hole to the upper end To make it possible that the protruding part in the cylinder liner is fed and works the cylinder bore pressed-in liners also in the fitting gap downwards, where it can be replaced by an interchangeable are, it is also already generally known 65 bore hole in the crankcase of the man, this gets under machine with a certain game. Use of a lubricant or release agent with The pulsating movement in the fitting gap is only light pressure to be used in the cylinder bore by running and running during engine operation