KR102177594B1 - Camshaft assembly for an internal combustion piston engine and method of converting an internal combustion piston engine to operate in at least two modes of operation - Google Patents

Abstract

The present invention relates to a camshaft assembly for an internal combustion piston engine, comprising a first end (16.1) and a second end (16.2), and an intermediate portion between the first end (16.1) and the second end (16.2) ( 18), the intermediate portion provided with cam surfaces of the camshaft assembly. The intermediate part 18 is connected to the first end 16.1 and the second end by means of first attachment means between the first end 16.1 and the intermediate part 18 and between the second end 16.2 and the intermediate part 18. (16.2) releasably assembled to, the camshaft assembly 10 comprises a spacer portion 20, the spacer portion being provided with second attachment means at both ends in the longitudinal direction, and the second attachment means ( 20) is compatible, for a releasable assembly, with the first attachment means between the first end 16.1 and the intermediate part 18.

Description

Camshaft assembly for an internal combustion piston engine and method of converting an internal combustion piston engine to operate in at least two modes of operation

The present invention relates to a camshaft assembly for an internal combustion piston engine, wherein a bearing surface is provided so that the camshaft assembly is rotatably supported by a bearing so that a first end and a second end capable of being assembled to the engine, and the first An intermediate portion between an end and said second end, said intermediate portion provided with cam surfaces of a camshaft assembly.

The invention also relates to a method of converting an internal combustion piston engine to operate in at least two modes of operation.

Internal combustion engines are one of the most efficient means of converting gas or liquid fuels into energy today. In the emerging gas market, it is possible to build engines that initially operate on liquid fuel and are converted to operate on gas. It works the other way too. When the gas supply is uncertain or the price fluctuates, this can perform switching the engine from gaseous fuel operation to liquid fuel operation. Of course, it can be assumed that switching between different fuels is also possible.

In internal combustion piston engines, the piston is arranged to reciprocate in a cylinder, and the reciprocating motion of the piston is transmitted to the rotational motion of the crankshaft. There is a camshaft arranged to actuate gas exchange valves in each cylinder of the engine. The camshaft is composed of a cylindrical rod extending along the length of the cylinder bank, from which a number of cams protrude. The cams force the valves open by applying a pressing force to the valve as the cams rotate.

In large engines capable of providing for example more than 150 kW/cylinder, the camshaft is often made up of individual parts. Typically, upon engine switching between operating fuels, the cam section of the shaft has been replaced with fuel specific cams during the switching. Transportation, storage and mounting of heavy cam sections is cumbersome and time consuming. It also requires careful handling of the cam surface, so this handling also risks damaging the cam when operating in difficult field conditions. Therefore, there is a need to improve a more practical solution to the problem.

One of the prior methods relating to adjusting the camshaft is disclosed in US 2010126445 A1, wherein the lifting profile element is provided in a rotationally fixed manner on an axially movably mounted camshaft and a control groove And has a control unit to generate a predetermined axial motion of the camshaft. The control unit has a tappet unit that is radially movable with respect to the camshaft and is designed to controllably couple to a lifting profile element, wherein the lifting profile element is intended to account for the axial motion of the camshaft. It forms first and second control grooves designed to interact with the tap fit unit at the first and second depths of penetration.

In addition, for example in the publications of EP 0798451 A1, US 2007204819 A1 and US 20100269769 A1 different types of valve drive assemblies are disclosed for axially moving cams on a camshaft. The cam parts are moved by the sleeve, by actuators on the toothed shaft or by grooves on the cam support side walls. However, in these arrangements, a number of deficiencies still remain, particularly with regard to simplicity and reliability.

It is an object of the present invention to provide a camshaft assembly that is simple to implement, reliable and considerably improved compared to prior art solutions.

The objectives of the present application may be fulfilled substantially as disclosed in the independent claims and in other claims that describe the more details of different embodiments of the present application.

According to an embodiment of the present invention, a camshaft assembly for an internal combustion piston engine includes a first end and a second end, and an intermediate portion between the first end and the second end, wherein cams of the camshaft assembly are provided. And an intermediate portion that is provided with a bearing surface at the ends thereof so that the camshaft assembly is rotatably supported by bearings through the bearing surfaces to be assembled to the engine, and the camshaft assembly has a longitudinal direction, and At least one of the cams comprises a first cam surface and a second cam surface substantially parallel to each other in the longitudinal direction, and the intermediate portion is releasably assembled to the first end and the second end.

According to an embodiment of the invention, the camshaft assembly comprises means for changing the relative position of the intermediate portion with respect to the bearing surface of the first end and the bearing surface of the second end in the longitudinal direction.

According to one embodiment of the invention, the intermediate portion comprises a first set of cams for use in actuating intake valves of an internal combustion piston engine and a second set of cams for use in actuating exhaust valves of an internal combustion piston engine, Each of the cams of the first set of cams and the second set of cams includes a first cam surface and a second cam surface adjacent to each other in a longitudinal direction.

According to one embodiment of the present invention, the intermediate portion comprises a third set of cams for use in operating a fuel pump of an internal combustion piston engine, each cam of said third set of cams being composed of only a first cam surface. .

According to one embodiment of the invention, the intermediate portion comprises a third set of cams for use in operating a fuel pump of an internal combustion piston engine, wherein each of the cams of the third set of cams are first adjacent to each other in the longitudinal direction. And a cam surface and a second cam surface.

According to an embodiment of the invention, the means for changing the relative position of the intermediate portion comprises at least one spacer portion or first end and intermediate portion arranged between the first end and the intermediate portion or between the second end and the intermediate portion. At least one of the first cam surface and the second cam surface of the cam, including more than one spacer portion arranged therebetween and between the second end and the intermediate portion, at the position of the cam follower which is a counterpart of the cam surface in the engine It is located in the longitudinal direction.

According to one embodiment of the invention, the means for changing the relative position of the intermediate portion comprises a spacer portion that is assembledly arranged between the first end and the intermediate portion or between the second end and the intermediate portion.

According to one embodiment of the present invention, the intermediate portion is releasably assembled to the first end and the second end, and the camshaft assembly includes a first spacer portion assembled between the first end and the intermediate portion.

According to an embodiment of the present invention, the camshaft assembly includes a first spacer portion assembled between a first end and an intermediate portion, and a second spacer portion assembled between a second end and an intermediate portion, wherein the first spacer The portion and the second spacer portion are of different lengths in the longitudinal direction, and the first spacer portion and the second spacer portion are each other in order to change the relative positions of the bearing surface at the first end and the intermediate portion with respect to the bearing surface at the second end in the longitudinal direction. Can be interchanged.

According to an embodiment of the invention, the means for changing the relative position of the intermediate portion comprises a first second end and a second second end provided with different engagement lengths in the longitudinal direction.

According to an embodiment of the invention, the means for changing the relative position of the intermediate portion comprises a first end and a second end which are provided with different engagement lengths in the longitudinal direction and are interchangeable with each other for changing in the longitudinal direction, The first and second ends are of different lengths in the longitudinal direction, and the first and second ends are used to change the relative position of the bearing surface of the first end and the intermediate part to the bearing surface of the second end in the longitudinal direction. They can be interchanged with each other.

The intermediate portion can be releasably assembled to the first and second ends by means of a first attachment between the first and intermediate portions and between the second and intermediate portions. Moreover, the camshaft assembly comprises a spacer portion provided with a second attachment means at both longitudinal ends thereof, the second attachment means comprising: a first attachment means between the first end and the intermediate portion and between the second end and the intermediate portion. The first attachment means of the and, for the releasable assembly, are compatible.

According to an embodiment of the present invention, the intermediate portion of the camshaft assembly comprises a plurality of cam sections each comprising a first cam surface and a second cam surface and a plurality of shaft portions between the front and rear releasably mounted cam sections. Including, to form an intermediate portion of the camshaft assembly.

According to an embodiment of the present invention, the intermediate portion of the camshaft assembly comprises a plurality of cam sections each including at least one cam belonging to a first set of cams and at least one cam belonging to a second set of cams and back and forth. A plurality of shaft portions between the releasably mounted cam sections form an intermediate portion of the camshaft assembly.

According to an embodiment of the present invention, the first cam surface and the second cam surface comprise different cam profiles.

This approach can advantageously be used in an internal combustion piston engine that can be switched between at least two configurations. For example, this means that the engine can be switched from a diesel engine to a gas engine or vice versa or between a gas fuel engine and a diesel engine with pilot liquid fuel ignition. The engine can also be switched to operate in different ways with the same fuel by changing the gas exchange characteristics by changing the lifting behavior of the gas exchange valve.

The term "cam surface" means a guide surface surrounding the camshaft, and the cam follower, when in use, acts to guide position relative to this guide surface.

The camshaft assembly according to the invention provides a sturdy and simple mechanical structure that can be implemented in a manner that is easy to change over.

The exemplary embodiments of the present application disclosed in this patent application should not be construed as limiting the applicability of the appended claims. The verb "to include" is used in this patent application as an open limitation that also does not exclude the presence of features not disclosed. Features disclosed in the dependent claims are freely combinable with each other unless otherwise specified. New features contemplated as features of the present application are disclosed in particular in the appended claims.

In the following, the present invention will be described with reference to the accompanying exemplary and schematic drawings.

1 shows a camshaft assembly according to an embodiment of the present invention.
2 shows a camshaft assembly according to another embodiment of the present invention.
3 shows a detail of a camshaft assembly according to an embodiment of the present application.
4 shows a camshaft assembly according to another embodiment of the present invention.
5 shows a camshaft assembly according to another embodiment of the present invention.
6 shows a camshaft assembly according to another embodiment of the present invention.

1 schematically shows a camshaft assembly 10 according to an embodiment of the present invention. 1 shows two different setups of a camshaft assembly 10 as A and B, and the camshaft assembly 10 can be assembled to these setups. The camshaft assembly 10 is shown in an installed position within the internal combustion piston engine 12. In Fig. 1 two bearings 14 are shown at the end of the camshaft assembly 10 on which the camshaft assembly 10 is supported in the engine. Although not shown, it is clear that there may actually be additional bearings.

The camshaft assembly 10 comprises a first end 16.1 and a second end 16.2 provided with a bearing surface, so that the camshaft assembly is rotatably supported by bearings 14 to the engine 12. Can be assembled. Thus, the positions of the first end 16.1 and the second end 16.2 are determined axially with the position of the bearings 14 in the engine 12. Even if the first end 16.1 and the second end 16.2 are rotatably fixed to the bearings 14 in the engine 12, the first end 16.1 and the second end 16.2 are at least subject to changeover. In the meantime, it can be moved axially to some extent, so that the camshaft assembly can be disassembled and reassembled to the extent necessary according to embodiments of the present invention.

An intermediate portion 18 is assembled between the first end 16.1 and the second end 16.2. The middle portion 18 is provided with cam surfaces of the camshaft assembly 10. The first end 16.1, the intermediate part 18 and the second end 16.2 are arranged continuously in the direction of the longitudinal axis of rotation D of the camshaft assembly 10. In the engine, the longitudinal rotation shaft D is in the direction of the rotation axis of the crankshaft of the engine. The intermediate part 18 is connected to the first end 16.1 and the second by means of a first attachment between the first end 16.1 and the intermediate part 18 and between the second end 16.2 and the intermediate part 18. It can be releasably assembled at the end (16.2). The camshaft assembly 10 comprises a spacer portion 20 provided with second attachment means at both ends in the longitudinal direction. The use of the spacer part 20 is for changing the relative position of the intermediate part 18 to the bearing surface of the first end 16.1 and the bearing surface of the second end 16.2 in the longitudinal axis D direction. It is a simple embodiment of the means.

According to an embodiment of the invention shown in FIG. 1, the second attachment means comprises a first attachment means between a first end 16.1 and an intermediate portion 18 and a second attachment means 16.2 and an intermediate portion 18. For installation, it is compatible with the 1st attachment means between. The second attachment means and the first attachment means are compatible with each other, such that the spacer portion 20 is between the first end 16.1 and the intermediate portion 18 or between the second end 16.2 and the intermediate portion 18. Can be installed optionally.

Within the scope of the present invention, there are two separate spacer parts 20, only one of which is suitable for installation in relation to the first end 16.1 of the camshaft assembly, and only the other It is also conceivable to modify the camshaft assembly of FIG. 1 to be suitable for installation with respect to the two end 16.2. In this embodiment, one of the spacer portions is provided with a second attachment means compatible with the first attachment means of the first end 16.1, and the other of the spacer portions is provided with the first attachment means of the second end 16.2 A compatible second attachment means is provided. In FIG. 1, view A shows the assembly 10 in a first setup, and view B shows the assembly 10 in a second setup. The camshaft assembly 10 according to the present invention shifts the position of the intermediate part 18 to the left or right in the longitudinal axis (D) direction with respect to the bearings 14 in the engine according to the installation position of the spacer part 20. It provides a tingling effect. When the longitudinal position of the intermediate portion 18 of the camshaft assembly 10 is changed, the effective cam surfaces in use also change, which will be described below.

Referring now to FIG. 1 again, the intermediate portion 18 is a first set of cams 22 for use in actuating an intake valve (not shown) of an internal combustion piston engine and an exhaust valve (not shown) of the internal combustion piston engine 12. And a second set of cams 24 for use in actuating the. Each of the cams of the first set of cams 22 and the second set of cams 24 is composed of a first cam surface (I) and a second cam surface (II) adjacent to each other in the longitudinal axis (D) direction. In the embodiment shown in FIG. 1, the widths of the first cam surface I and the second cam surface II are substantially the same as the width of the spacer portion 20. More important than the width, by the control of the cam follower, when the setup of the assembly 10 is changed, the change from the first cam surface to the second cam surface, ie the middle part is sufficiently moved. The width means the dimension in the vertical axis (D) direction.

This approach can be used advantageously in an internal combustion piston engine that can be switched between at least two operating configurations. For example, it means that the engine can be converted from a diesel engine to a gas engine and vice versa.

The engine is provided with an actuating system 26 for actuating, ie opening and closing, gas exchange valves (not shown) driven or actuated by the camshaft assembly 10. The actuation system 26 includes a cam follower 28 arranged in association with each valve actuator. The cam follower is configured to follow the cam surface, and thus reciprocates according to a change in the radial distance of the cam surface from the axis of rotation of the camshaft assembly. The operating system belongs to the engine 12 and is arranged in a predetermined fixed longitudinal position in the direction of the longitudinal axis D in the engine. Thus, when the camshaft assembly 10 is changed between the setups A, B for the ends 16.1, 16.2 and bearings 14, the effective cam surface for each cam follower is changed accordingly. do.

In the embodiment of FIG. 1, the intermediate portion 18 further comprises a third set of cams 25 for use in operating a liquid fuel pump 27 of an internal combustion piston engine. Thus, this setup can be used for engines running according to diesel cycles using liquid fuel. Further, the fuel pump is provided with a cam follower 28. In the embodiment of FIG. 1, each of the cams of the third set of cams 25 has only a first cam surface (I). The first cam surface is intended for use when the engine is configured to operate according to the diesel cycle, and when the camshaft is changed such that the cam surface is not in the position of the fuel pump 27, the engine is, for example, a spark ignited gas engine. Can be operated as

The intermediate part 18 comprises a number of cam sections 18.1 equal to the number of cylinders of the engine 12. Each of the cam sections 18.1 comprises at least one cam belonging to the first set of cams 22 and at least one cam belonging to the second set of cams 24 as shown in the embodiment of FIG. . The camshaft assembly according to the embodiment of FIG. 2 is usable when different gas exchange behaviors are desired to be obtained. Otherwise, the camshaft assembly 10 shown in FIG. 2 corresponds to that shown in FIG. 1. In the embodiment of FIG. 1, the cam section 18.1 also comprises one cam belonging to a third set of cams 25 intended to operate, for example, a fuel pump. The intermediate portion 18 also comprises a number of shaft portions 18.2 between the front and rear releasably mounted cam sections 18.1, forming an intermediate portion 18 of the camshaft assembly 10. The shaft portion 18.2 is advantageously provided with a bearing surface so as to be able to support the camshaft assembly 10 rotatably with respect to the longitudinal axis, between the ends, by means of the shaft portion 18.2. The number of cams can vary depending on the design of the engine, ie the number of actual gas exchange valves in one cylinder and the number of other camshaft actuated devices.

The first cam surface (I) and the second cam surface (II) comprise different cam profiles for use in different configurations of the engine, and the selection of the cam surface used is alternatively the first of the camshaft assembly (10). Or by selecting and assembling the second setup. A change of setup is carried out while the engine is stopped. When the camshaft assembly 10 according to the invention is installed in the internal combustion engine 12, the engine can be easily configured later in two or more different operating modes by the camshaft assembly according to the invention. The characteristics of the cam systems of the engine can be changed in a simple manner and with minimal change of the camshaft, even if it is a field service procedure to meet the needs of each engine configuration.

In the setup shown in point A of FIG. 1, the internal combustion engine is configured to operate using the used liquid fuel. This can be implemented, for example, as a dual fuel (DF) engine using diesel pilot injection or as a commonly known diesel mode operation, which may of course require different cam surfaces to be different in different cases. For example, when the cam surfaces of the third set of cams 25 are used in a DF engine, the stroke length of the fuel pump and the timing of the fuel injection are determined by the longer stroke of the pump (more It can be set differently than for diesel engines that require a large amount of fuel.

In the case shown from point A, the spacer portion 20 is between the second end 16.2 and the intermediate portion 18. Now, the first cam surfaces I of the set of cams 22, 24 are in an axial position in the direction of the longitudinal axis D, wherein the first cam surfaces are the respective cam followers 28 of the valve actuation system. ) And cooperate. In this way, the first cam surfaces I are operating the gas exchange valves, and also the first cam surfaces of the third set of cams 25 are each cam follower 28 of the fuel pumps 27. ) And cooperating. According to the invention, the intermediate part 18 can be moved axially in the engine, so that one of several adjacent cam surfaces of a set of cams 22, 24 is at the position of its operating counterpart, i.e. the engine It is evident that it is located in the position of the cam follower, such as the gas exchange valve in the fuel pump or the cam follower. The moving length of the intermediate portion 18 must change the control of the cam follower from the first cam surface to the second cam surface, which can lead to different kinds of control of the follower.

In the setup shown in point B of Fig. 1, the internal combustion engine is configured to operate as a gas engine that is ignited by applying ignition energy directly to the combustion chamber, such as spark ignition, laser ignition or plasma ignition. In the case shown in view B, the spacer portion 20 is between the first end 16.1 and the cam section 18.1 of the intermediate portion 18. In this position of the camshaft assembly 10, the second cam surfaces II of the set of cams 22, 24 are in one position in the direction of the longitudinal axis D, where this is the actuating system of the gas exchange valves. Cooperate with each of the cam followers (28). As schematically shown from point B, the cam follower 28 of the fuel pump 27 has been removed to enable shifting the middle portion 18 of the camshaft assembly 10. This can be done since the engine does not need liquid fuel in this case. In practice, the configuration of the engine can be made so that no changes to the engine are required, that is, it should not be understood that the removal of the cam follower 28 of the fuel pump is an essential step.

FIG. 3 shows in more detail a side view of the cam section 18.1 and the shaft portion 18.2 and the spacer portion 20 similar to FIG. 2. Further, a front view of the cam section 18.1 and the spacer portion 20 is shown. Now, the intermediate part 18 is assembled by using the required number of cam sections 18.1 and the shaft part 18.2 and assembling them one after the other. The cam sections 18.1 and the shaft portion 18.2 are provided with first attachment means 30 at their longitudinal ends. Since the intermediate part 18 is formed of the cam section 18.1 and the shaft part 18.2, the intermediate part is also provided with a first attachment means 30, and thus the intermediate part 18 is provided with the first attachment means 30 ) Can be releasably assembled to the first end (16.1) and the second end (16.2).

The spacer portion 20 is provided with a second attachment means 32 at its longitudinal end, and the second attachment means 32 can be compatible with the first attachment means 30, for installation. Although not shown here, the first end 16.1 and the second end 16.2 are also provided with a first attachment means 30, so that the spacer part can also be attached to the end. The second attachment means 32 and the first attachment means 30 are compatible with each other such that the spacer portion 20 is between the first end 16.1 and the middle portion 18 or between the second end 16.2 and the middle It can be installed selectively between the parts 18.

In the embodiment of the parts of the assembly 10 shown in FIG. 3, the first attachment means 30 and the second attachment means 32 comprise a flange section 34 at the axial end. The flange sections 34 are compatible with each other for assembly butting. The flange sections 34 are provided with an opening 40 for a screw 36 or similar threaded bar. The openings 40 are arranged in an angularly spaced manner so as to surround the edge portion of the flange section 34. The shaft portion 18.2 is provided with threaded holes 38 arranged to mate with openings 40 arranged angularly spaced apart so as to surround the edge portion of the flange section 34. The flange sections 34 are also provided with guiding and/or centering means 42 at their axial ends. The guiding and/or centering means 42 are shown in the form of a truncated cone bulging axially inward and bulging outward at the mating surfaces attached to each other. At one axial end of the parts of the assembly, the frustum cone bulges (recess) axially inward, and at the opposite axial end the frustum cone bulges (protrusion) outward. In the parts assembled successively in this way, the guiding and/or centering means 42 in the shape of a truncated cone are arranged in mating with each other. Another possibility to achieve a similar effect is to use the hemispherical shape. 3 also shows the cam surfaces I, II of the cam section 18.1.

5 shows another embodiment of the present invention. As shown in Fig. 5, the effect of the invention can also be obtained by a camshaft assembly, where the means for changing the relative position of the intermediate portion 18 are at the same time at both ends of the intermediate portion 18. And assembled spacers 20. The spacer portions have different lengths in the longitudinal axis (D) direction. The feature that the spacers 20 are of different lengths can also be obtained by providing three substantially identical spacers 20, one of which is assembled at one end of the intermediate part 18 and two It is assembled at the other end of the intermediate part 18, which is shown in dotted lines on the right side of the spacer part 20 of the intermediate part 18.

6 shows another embodiment of the present invention. In this embodiment, the intermediate portion 18 can be moved along the longitudinal axis D as follows. The camshaft assembly includes a first end 16.1 and a second end 16.2. The first end 16.1 is adapted to provide support to the bearing 14 using a specific extent in the direction of the longitudinal axis D. In other words, the first end 16.1 can be fixed to the engine in different longitudinal positions. On the other hand, the assembly comprises two separate second ends 16.2a, 16.2b, one of which is used when the engine is arranged to operate in a first mode of operation, and the other is a second mode of operation. Used when arranged to work in. The second ends 16.2a, 16.2b are of different engagement lengths, so that the position of the intermediate portion 18 is changed depending on which one of the ends is used. The engagement length means the distance from the bearing 14 to the first attachment means 30, ie the end of the intermediate portion 18 in the assembly. When the positions of the second ends 16.2a and 16.2b are changed, the support positions of the first ends 16.1 on the bearings 14 are changed, respectively, and the intermediate portion 18 is moved.

A corresponding effect can be obtained by using one (or more) spacer parts 20 that are assembled or separated only between the second end 16.2 and the intermediate part 18 and set the intermediate part at different longitudinal positions. . Even in this case, the support of the first end 16.1 on the bearing 14 is respectively changed as described above and the intermediate part 18 is moved.

Thus, in general, a camshaft arrangement can be used in a method of converting an internal combustion piston engine, the engine comprising a camshaft assembly according to any one of the embodiments disclosed herein to operate in at least two modes of operation, In this way, the engine is configured such that the intermediate part 18 is the camshaft between the first end 16.1 and the second end 16.2 in a longitudinal position in which the cam follower of the engine is guided from the first cam surface I. Arranged to operate in a first mode of operation to be assembled to the assembly, the engine is in a second mode of operation such that the intermediate portion 18 is assembled to the camshaft assembly at a position where the cam followers are guided from the second cam surface (II). Arranged to work.

While the present invention has been described by way of examples in connection with what is now considered the most preferred embodiments herein, the present invention is not limited to the disclosed embodiments, but as defined in the appended claims, features of the present application It is to be understood that it is intended to cover various combinations or variations of these, and several other applications included within the scope of the present invention. Detailed descriptions mentioned in connection with any of the above embodiments may be used in view of another embodiment if such combinations are technically feasible.

Claims (15)

As a camshaft assembly for an internal combustion piston engine,
A first end (16.1) and a second end (16.2), and an intermediate part (18) between the first end (16.1) and the second end (16.2), wherein the cams of the camshaft assembly are provided Includes wealth,
The ends (16.1, 16.2) are provided with a bearing surface so that the camshaft assembly (10) is rotatably supported by bearings (14) through the bearing surfaces to be assembled to the engine (12),
The camshaft assembly has a longitudinal axis (D) direction,
At least one of the cams of the intermediate portion 18 comprises a first cam surface (I) and a second cam surface (II) substantially parallel to each other in the direction of the longitudinal axis (D),
The intermediate part 18 is releasably assembled to the first end 16.1 and the second end 16.2,
The camshaft assembly provides means for changing the relative position of the intermediate portion 18 with respect to the bearing surface of the first end (16.1) and the bearing surface of the second end (16.2) in the direction of the longitudinal axis (D). It characterized in that it comprises, the camshaft assembly. delete The method of claim 1,
The intermediate portion 18 comprises a first set of cams 22 for use in operating the intake valves of an internal combustion piston engine and a second set of cams 24 for use in operating the exhaust valves of an internal combustion piston engine 12 ), wherein each of the cams of the first set of cams 22 and the second set of cams 24 has a first cam surface (I) and a second cam surface adjacent to each other in the longitudinal axis (D) direction. (II), characterized in that it comprises a camshaft assembly. The method of claim 3,
The intermediate portion 18 comprises a third set of cams 25 for use in operating a fuel pump of an internal combustion piston engine 12, each cam of the third set of cams being a first cam surface ( I), characterized in that consisting of only, camshaft assembly. The method of claim 1,
The intermediate part 18 comprises a third set of cams 25 for use in operating the fuel pump of the internal combustion piston engine 12, each cam of the third set of cams 25 being the longitudinal axis A camshaft assembly, characterized in that it comprises a first cam surface (I) and a second cam surface (II) adjacent to each other in the (D) direction. The method of claim 1,
The means for changing the relative position of the intermediate part 18 may be between the first end (16.1) and the intermediate part (18) or between the second end (16.2) and the intermediate part (18). A camshaft assembly, characterized in that it comprises a spacer portion (20) arranged to be assembled. The method of claim 1,
The intermediate part 18 can be releasably assembled to the first end 16.1 and the second end 16.2, and the camshaft assembly 10 includes the first end 16.1 and the intermediate part (18) A camshaft assembly, characterized in that it comprises a first spacer portion (20) assembled between. The method of claim 1,
The intermediate part 18 can be releasably assembled to the first end 16.1 and the second end 16.2, and the camshaft assembly 10 includes the first end 16.1 and the intermediate part (18) a first spacer part (20) assembled between, and a second spacer part (20') assembled between the second end (16.2) and the middle part (18),
The first spacer portion 20 and the second spacer portion 20' have different lengths in the vertical axis (D) direction,
The first spacer part 20 and the second spacer part 20' are relative to the bearing surface of the first end 16.1 and the bearing surface of the second end 16.2. Camshaft assembly, characterized in that they can be interchanged with each other to change the position in the direction of the longitudinal axis (D). The method of claim 1,
The means for changing the relative position of the intermediate part 18 is a first second end (16.2a) and a second second end (16.2b) provided with different mating lengths in the direction of the longitudinal axis (D). Characterized in that it comprises a, camshaft assembly. The method of claim 1,
The means for changing the relative position of the intermediate part 18 comprises a first end 16.1 which is provided with different engagement lengths in the direction of the longitudinal axis (D) and is interchangeable with each other for changing in the direction of the longitudinal axis (D). And a second end 16.2,
The first end (16.1) and the second end (16.2) have different lengths in the longitudinal axis (D) direction,
The first end (16.1) and the second end (16.2) are the bearing surface of the first end (16.1) and the relative position of the intermediate part (18) to the bearing surface of the second end (16.2) in the longitudinal axis. (D) Camshaft assembly, characterized in that they can be interchanged with each other to change in orientation. The method of claim 6,
The intermediate part 18 is by means of a first attachment means between the first end (16.1) and the intermediate part (18) and between the second end (16.2) and the intermediate part (18). 16.1) and the second end (16.2) can be releasably assembled,
The spacer portion (20) is provided with a second attachment means at both longitudinal ends thereof, the second attachment means (20) being the first attachment between the first end (16.1) and the intermediate portion (18). A camshaft assembly, characterized in that, for a releasable assembly, compatible with at least one of the means and the first attachment means between the second end (16.2) and the intermediate section (18). The method of claim 3,
The intermediate portion (18) of the camshaft assembly is a plurality of cam sections each comprising at least one cam belonging to a first set of cams (22) and at least one cam belonging to a second set of cams (24) 18.1, and a plurality of shaft portions 18.2 between the cam sections 18.1 releasably mounted back and forth, forming the intermediate portion 18 of the camshaft assembly 10. Characterized in, camshaft assembly. The method of claim 4,
The intermediate portion 18 of the camshaft assembly 10 comprises at least one cam belonging to the first set of cams 22, at least one cam belonging to the second set of cams 24, and a third set A plurality of cam sections 18.1 each comprising at least one cam belonging to the cams 25 of the camshaft assembly, and a plurality of shaft portions between the cam sections releasably mounted back and forth. The camshaft assembly, characterized in that forming the intermediate portion. The method of claim 1,
The camshaft assembly, characterized in that the first cam surface (I) and the second cam surface comprise different cam profiles. A method of converting an internal combustion piston engine comprising a camshaft assembly according to claim 1 to operate in at least two modes of operation,
In the above method, the engine is configured such that the intermediate portion 18 has the first end 16.1 and the second end 16.2 at a longitudinal position in which the cam follower of the engine is guided from the first cam surface (I). ) Arranged to operate in a first mode of operation to be assembled to the camshaft assembly between,
The engine, characterized in that the engine is arranged to operate in a second mode of operation such that the intermediate portion (18) is assembled to the camshaft assembly at a position where the cam followers are guided from the second cam surface (II). How to switch the engine.

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