DE202023102190U1 - Cylinder liner for an internal combustion engine - Google Patents

Abstract

Cylinder liner for an internal combustion engine, comprising:
- a cylindrical base body (2), which cylindrical base body (2) has a longitudinal axis (3) and a lateral surface (4),
- An end face (5) which faces a cylinder head in the assembled state of the v (1) in the internal combustion engine, and
- at least one cooling channel (6), which has a first opening (7) on the end face (5) and a second opening (8) on the lateral surface (4) and is designed to carry a tempering medium for tempering the cylinder liner (1). to guide the base body (2), the at least one cooling channel (6) penetrating the base body (2) in a straight line between the first opening (7) on the end face (5) and the second opening (8) on the lateral surface (4), characterized in that the at least one cooling channel (6) has an angle (a) of 45° to 75°, preferably 50° to 70°, particularly preferably 66° to the longitudinal axis (3).

Description

The present invention relates to a cylinder liner for an internal combustion engine with the features of the preamble of claim 1 and an internal combustion engine with such a cylinder liner.

A cylinder liner is an insert for a crankcase of an internal combustion engine (internal combustion engine), which forms a running surface for a piston of the reciprocating engine.

Cylinder liners are often used because the material from which the crankcase is made does not meet the tribological requirements for a running surface for piston movement. So it is expedient to arrange a cylinder liner in a cylinder bore in the crankcase. Corresponding cylinder liners are mostly - used detachably in the cylinder bore of the crankcase - especially in large internal combustion engines, such as stationary internal combustion engines, for power generation, whereby they can be exchanged, dismantled or reused during maintenance work.

Corresponding cylinder liners are therefore exposed to enormous thermal influences, which makes it necessary to actively cool the cylinder liners.

This is usually done by forming a gap space and/or a channel system between the cylinder liner and the wall of the cylinder bore of the crankcase, through which a coolant of the internal combustion engine is conducted, whereby thermal energy can be dissipated by flushing the cylinder liner.

A corresponding configuration is, for example, from EP 3 317 565 A1 out.

However, corresponding configurations resulted in the desire to be able to dissipate thermal energy from the cylinder liner even more efficiently, which resulted in configurations from the prior art in which cooling channels were formed in the cylinder liner, with a coolant being able to be routed directly through the cylinder liner.

Other known from the prior art embodiments go for example from DE 10 2016 213 252 A1 , the KR 10 1465373 B1 , the KR 10 1458727 B1 , the CN 107701324A , the KR 10 1394767 B1 , the KR 101914791 B1 , the KR 10 2016 0103735 A , the KR 2016 0097570 A , the CN 112483272A , the EP 2 861 856 B1 , the EP 2 224 119 A1 , the US 4,050,421A or the US 4,172,435A out.

• - einen zylindrischen Grundkörper, welcher zylindrische Grundkörper eine Längsachse und eine Mantelfläche aufweist,
• - eine Stirnfläche, welche im montierten Zustand der Zylinderlaufbuchse in der Brennkraftmaschine einem Zylinderkopf zugewandt ist, und
• - wenigstens einen Kühlkanal, welcher eine erste Öffnung an der Stirnfläche und eine zweite Öffnung an der Mantelfläche aufweist und dazu ausgebildet ist, ein Temperiermedium zum Temperieren der Zylinderlaufbuchse durch den Grundkörper zu führen,

wobei der wenigstens eine Kühlkanal zwischen der ersten Öffnung an der Stirnfläche und der zweiten Öffnung an der Mantelfläche den Grundkörper geradlinig durchdringt.Generic cylinder liners include:

• - a cylindrical base body, which cylindrical base body has a longitudinal axis and a lateral surface,
• - An end face, which faces a cylinder head in the mounted state of the cylinder liner in the internal combustion engine, and
• - at least one cooling channel, which has a first opening on the end face and a second opening on the lateral surface and is designed to guide a tempering medium through the base body for tempering the cylinder liner,

wherein the at least one cooling channel penetrates the base body in a straight line between the first opening on the end face and the second opening on the lateral surface.

A corresponding configuration known from the prior art is, for example, from CN 110 080 901 B out.

In appropriate configurations, bores are provided in the cylinder liners from the end face to a lateral surface in order to be able to have a cooling medium flow around the largest possible area of the cylinder liner - if possible the entire area of the cylinder liner enclosing the combustion chamber - in order to circulate the cylinder liner along its entire longitudinal axis to be able to temper through cooling channels.

Due to the ever-increasing demands and the ever-growing desire for an increase in performance, there is also a continuous desire for improved and optimized temperature control with regard to the cylinder liner.

Consequently, the present invention is based on the object of providing a cylinder liner which, compared to the prior art, permits improved temperature control and/or permits more efficient thermal energy dissipation and/or enables improved thermal conditions during operation of the internal combustion engine.

This object is achieved by a cylinder liner having the features of claim 1 and an internal combustion engine with such a cylinder liner.

• - einen zylindrischen Grundkörper, welcher zylindrische Grundkörper eine Längsachse und eine Mantelfläche aufweist,
• - eine Stirnfläche, welche im montierten Zustand der Zylinderlaufbuchse in der Brennkraftmaschine einem Zylinderkopf zugewandt ist, und
• - wenigstens einen Kühlkanal, welcher eine erste Öffnung an der Stirnfläche und eine zweite Öffnung an der Mantelfläche aufweist und dazu ausgebildet ist, ein Temperiermedium zum Temperieren der Zylinderlaufbuchse durch den Grundkörper zu führen,

wobei der wenigstens eine Kühlkanal zwischen der ersten Öffnung an der Stirnfläche und der zweiten Öffnung an der Mantelfläche den Grundkörper geradlinig durchdringt und der wenigstens eine Kühlkanal zur Längsachse einen Winkel von 45° bis 75°, vorzugsweise 50° bis 70°, besonders bevorzugt 66°, aufweist.Cylinder liners for internal combustion engines according to the invention include:

• - a cylindrical base body, which cylindrical base body has a longitudinal axis and a lateral surface,
• - An end face, which faces a cylinder head in the mounted state of the cylinder liner in the internal combustion engine, and
• - at least one cooling channel, which has a first opening on the end face and a second opening on the lateral surface and is designed to guide a tempering medium through the base body for tempering the cylinder liner,

wherein the at least one cooling channel penetrates the base body in a straight line between the first opening on the end face and the second opening on the lateral surface and the at least one cooling channel is at an angle of 45° to 75°, preferably 50° to 70°, particularly preferably 66° to the longitudinal axis , having.

The higher angle to the longitudinal axis of the cylinder liner compared to the prior art means that the at least one cooling duct encloses a smaller area in terms of the longitudinal extension along the longitudinal axis of the cylinder liner, with the applicant surprisingly being able to establish that it is individual, targeted and efficient temperature control of the rammed cylinder liner can be carried out.

The regions of the cylinder liner that are most thermally affected are now temperature-controlled, in particular cooled, in a more targeted and efficient manner by the at least one cooling channel and the temperature control medium guided therein, as a result of which the thermal energy can be prevented from spreading over the entire cylinder liner and the entire cylinder liner can be temperature-controlled more efficiently.

Cooling ducts, which - as known from the prior art - are provided over a longer region along the longitudinal extent of the cylinder liner in the direction of the longitudinal axis, have the disadvantage that the cooling medium in the entrance area of the cooling duct can absorb thermal energy and spread it along the entire cooling duct, whereby temperature control is carried out along a longer distance with respect to the longitudinal axis, but heat transport also takes place within the cylinder liner.

By providing higher angles of the at least one cooling channel with respect to the longitudinal axis, temperature control can be carried out efficiently and purposefully in the area near the end face that is most thermally affected, with thermal energy from this area, for example, not being transported to a more distant area of the cylinder liner by the temperature control medium.

At least one cooling channel can thus be designed to guide a tempering medium for tempering the cylinder liner through the uppermost area of the base body that is subject to the highest temperature load, which extends between the end face and the lateral surface of the cylinder liner.

Heat transport via the thermal conduction of the cylinder liner can thus also be prevented or reduced, since the heat energy can be extracted efficiently and purposefully from the cylinder liner in the area of the at least one cooling channel.

An angle of the at least one cooling channel relative to the longitudinal axis of the cylinder liner of 66° is special in the course of the present document due to manufacturing tolerances and inaccuracies in an angular range of 65.5° to 66.5°, preferably 65.7° to 66.3° preferably 66.1°.

Internal combustion engines can be understood as meaning thermal working machines in which energy released thermally by combustion is converted into mechanical work, such as in Otto engines, diesel engines or the like.

In particularly preferred embodiments, the lateral surface is essentially circular-cylindrical and/or conical, preferably with a cone angle of 4°, and/or cylindrical.

It can be provided that the lateral surface—preferably partially essentially cylindrical—is conical at least in some areas. Inclinations of partial surfaces of the cylinder liner are also conceivable.

It can be provided that the lateral surface in the area of the second opening has an angle of 1° to 10°, preferably 2° to 5°, particularly preferably 4°, to the longitudinal axis.

Within the scope of the invention, the end face does not necessarily have to be aligned exactly normal to the longitudinal axis. Rather, it is preferably that surface or collection of surfaces that faces the cylinder head during operation. It is already known per se in the prior art, the face with different to provide structures that serve different purposes.

The use of the invention in stationary internal combustion engines, preferably gas-operated reciprocating piston engines, has proven to be particularly advantageous. Marine applications are also quite conceivable.

Internal combustion engines, in particular stationary internal combustion engines, can be used to drive generators to generate electricity. Such units with a generator driven by an internal combustion engine are often also referred to as gensets.

A cylinder liner according to the invention or an internal combustion engine according to the invention can be used in already existing systems of the prior art, as described for example in the introduction to the description, and installed subsequently.

Advantageous embodiments of the invention are defined in the dependent claims.

Provision can be made for the at least one cooling channel to have a continuously closed wall between the first opening and the second opening.

Provision is preferably made for the at least one cooling channel to have a constant cross section between the first opening and the second opening.

Provision can be made for the at least one cooling channel to be in the form of a bore.

Provision is preferably made for the bore to have a diameter of 5 mm to 15 mm, preferably 7 mm to 12.5 mm, particularly preferably 8 mm to 9 mm.

In a particularly preferred embodiment, it can be provided that the at least one cooling channel designed as a bore has a diameter of 8.6 mm.

Provision can be made for the end face to have a partial surface, at least in the region of the at least one first opening of the at least one cooling duct, which partial surface is aligned essentially normal to a longitudinal axis of the at least one cooling duct.

A substantially normally aligned partial surface of the end face can provide for the at least one cooling channel to have particularly favorable production conditions, with a bore being able to be produced favorably by a drill without the drill running or breaking when it is inserted in the region of the first opening.

It can be provided that the cylinder liner has 20 to 35, preferably 25 to 30, particularly preferably 26 to 28, cooling channels.

Provision can preferably be made for the cylinder liner to be designed as a mid-stop liner.

So-called mid-stop liners have a shoulder on their outer circumference in the middle of their longitudinal extent, in which they are mounted in a corresponding receptacle in the bore of the crankcase.

Configurations of the cylinder liner in which the cylinder liner is designed as a hanging, wet cylinder liner are also entirely conceivable.

Protection is also sought for an internal combustion engine with at least one cylinder liner according to the invention.

Provision can preferably be made for a cooling medium which has a pressure of 2.5 bar and/or a temperature of 90° Celsius when entering the first opening to pass through the at least one cooling channel during operation of the internal combustion engine.

• 1 ein erstes Ausführungsbeispiel einer erfindungsgemäßen Zylinderlaufbuchse,
• 2 einen Längsschnitt durch 1,
• 3 den in 2 gekennzeichneten Schnitt A-A,
• 4 den in 3 gekennzeichneten Schnitt H-H.

Further advantages and details of the invention result from the figures and the associated description of the figures. It shows:

• 1 a first embodiment of a cylinder liner according to the invention,
• 2 a longitudinal section 1 ,
• 3 the in 2 marked section AA,
• 4 the in 3 marked section HH.

1 shows a first exemplary embodiment of a cylinder liner 1 for an internal combustion engine.

The cylinder liner comprises a cylindrical base body 2 , which cylindrical base body 2 has a longitudinal axis 3 .

In an installed state of the cylinder liner 1, the cylinder liner 1 is aligned with its end face 5 in the direction of the cylinder head.

The cylinder running surface 10 is designed to accommodate the piston of the internal combustion engine and to guide it along the longitudinal axis 3 , with the cylinder running surface 10 extending rotationally symmetrically around the longitudinal axis 3 .

To control the temperature of the cylinder liner 1 , the cooling channels 6 are provided, which extend between a first opening 7 on the end face 5 of the cylinder liner 1 and a second opening 8 on the lateral surface 4 of the cylinder liner 1 .

This cooling channels 6 will be discussed in more detail below, it being pointed out that the 2 a longitudinal section along the longitudinal axis 3 of the embodiment of 1 shows.

3 shows the in 2 marked section AA.

And 4 puts the in 3 marked section HH.

It can thus be seen that 27 cooling channels 6 are provided, which extend between the end face 6 and the lateral surface 4 .

These 27 cooling channels 6 are correspondingly distributed symmetrically and evenly around the longitudinal axis 3 .

How each of these cooling channels 6 is formed is in more detail by the 4 apparent.

In this exemplary embodiment, the cooling channels 6 are implemented as bores 9 which extend in a straight line between the first opening 7 on the end face 5 and the second opening 8 on the lateral surface 4 .

The cooling channels 6, more precisely the bores 9, have a longitudinal axis 12 which is arranged at an angle of 66° to the longitudinal axis 3 in this exemplary embodiment.

As can be seen, the cooling channels 6 are in a certain sense in the cylinder jacket which the cylinder liner 1 forms.

For better implementability of the production of the bores 9, the end face 5 has a partial surface 11, which was produced rotationally symmetrically to the longitudinal axis 3 by a turning process and is at right angles to the longitudinal extension 12 of the cooling channel 6 in the area of the first opening 7.

The cooling channels 6 are formed between the first opening 7 and the second opening 8 with a closed wall (ie continuous without interruption) and have a constant cross section.

As indicated by the dashed lines between 4 and 3 geometrically illustrated, each cooling channel 6 overlaps the cylinder liner 1 with an overlap 13.

In this special embodiment, the overlap 13 is 60° of the cylinder liner 1 in relation to the longitudinal axis 3.

The illustrated cylinder liner 1 of this exemplary embodiment is designed as a mid-stop liner.

Reference List

1

cylinder liner

2

body

3

longitudinal axis

4

lateral surface

5

face

6

cooling channel

7

first opening

8th

second opening

9

drilling

10

cylinder surface

11

face

12

Longitudinal axis of the cooling channel

13

overlap

a

angle

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 3317565 A1 [0006]
• DE 102016213252 A1 [0008]
• KR 101465373 B1 [0008]
• KR 101458727 B1 [0008]
• CN 107701324A [0008]
• KR 101394767 B1 [0008]
• KR 101914791 B1 [0008]
• KR 1020160103735 A [0008]
• KR 20160097570 A [0008]
• CN 112483272A [0008]
• EP 2861856 B1 [0008]
• EP 2224119 A1 [0008]
• US4050421A [0008]
• US4172435A [0008]
• CN 110080901B [0010]

Claims (10)

Cylinder liner for an internal combustion engine, comprising: - a cylindrical base body (2), which cylindrical base body (2) has a longitudinal axis (3) and a lateral surface (4), - an end face (5), which in the assembled state of the v (1) faces a cylinder head in the internal combustion engine, and - at least one cooling duct (6) which has a first opening (7) on the end face (5) and a second opening (8) on the lateral surface (4) and is designed to Leading the temperature control medium for temperature control of the cylinder liner (1) through the base body (2), the at least one cooling channel (6) between the first opening (7) on the end face (5) and the second opening (8) on the lateral surface (4 ) penetrates the base body (2) in a straight line, characterized in that the at least one cooling channel (6) has an angle (a) of 45° to 75°, preferably 50° to 70°, particularly preferably 66°, to the longitudinal axis (3). . cylinder liner claim 1 , wherein the at least one cooling channel (6) between the first opening (7) and the second opening (8) has a continuously closed wall. Cylinder liner according to one of the preceding claims, wherein the at least one cooling channel (6) between the first opening (7) and the second opening (8) has a constant cross section. Cylinder liner according to at least one of the preceding claims, wherein the at least one cooling channel (6) is designed as a bore (9). Cylinder liner according to the preceding claim, wherein the bore (9) has a diameter of 5 mm to 15 mm, preferably 7 mm to 12.5 mm, particularly preferably 8 mm to 9 mm. Cylinder liner according to at least one of the preceding claims, wherein the at least one cooling channel (6) overlaps a cylinder surface (10) of the cylinder liner (1) by 40° to 80°, preferably by 50° to 70°, particularly preferably by 60°. Cylinder liner according to at least one of the preceding claims, wherein the end face (5) has a partial surface (11) at least in the region of the at least one first opening (7) of the at least one cooling channel (6), which partial surface (11) is essentially normal to a longitudinal axis (12) of the at least one cooling channel (6) is aligned. Cylinder liner according to at least one of the preceding claims, wherein the cylinder liner (1) has 20 to 35, preferably 25 to 30, particularly preferably 26 to 28, cooling channels (6). Cylinder liner according to at least one of the preceding claims, wherein the cylinder liner (1) is designed as a mid-stop liner. Internal combustion engine with at least one cylinder liner (1) according to at least one of the preceding claims.

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