DE102021101224A1 - Carrier module for a switchable valve train of a heavy-duty internal combustion engine - Google Patents

Abstract

Proposed is a carrier module (1) for a switchable valve drive of a heavy-duty internal combustion engine, with an axle piece (2) which has an assembly (3) with a cam rocker arm (4) and a valve rocker arm (5) next to the cam rocker arm (4), which rocker arms ( 4, 5) lie against one another over a partial area (6), in which a coupling mechanism (7) with a receptacle (8, 9) parallel to the axis piece is seated in each rocker arm (4, 5), with one of the receptacles (9, 8) having a Coupling slide (10) runs, which can be shifted in sections into the receptacle (8, 9) of the other rocker arm (5, 4) for coupling the rocker arm (4, 5), which shifting is accomplished in one direction via pressure oil, which consists of a Central channel (11) is routed through the axle piece (2), from which a transverse channel (12) branches off through the axle piece (2) in the assembly (3), which is connected to a longitudinal channel (13) in one of the rocker arms (5, 4th ) is at least indirectly connected, which to a pressure chamber (14) in front of an end face (15) of the coupling slide (10), with a control slide (17) with a blocking and a release area (18, 19) for the Pressure oil from the transverse channel (12) is installed and at least one e-actuator (20) is attached to the carrier module (1) for each assembly (3), via which the control slide (17) can be displaced in at least one direction.

Description

The invention relates to a cylinder-specific carrier module for a switchable valve train of a heavy-duty internal combustion engine, with an axle piece that has at least one assembly with at least one cam rocker arm and a valve rocker arm next to the cam rocker arm, pivotable relative to one another, which rocker arms rest on one another over a partial area in which a coupling mechanism with a receptacle parallel to the axis piece in each rocker arm, with a coupling slide running in one of the receptacles, which can be shifted in sections into the receptacle of the other rocker arm for coupling the rocker arm, and with at least one e-actuator per assembly being seated on the carrier module.

A heavy-duty internal combustion engine is to be understood as meaning a machine such as is used in particular to drive a truck, transporter, light transporter, agricultural implement, ship, mining or construction site equipment, etc.

The one that has not yet been published at the time of registration will be the closest DE 10 2020 113 222.0 considered. The resulting carrier module has two assemblies. A first, intake-side assembly with exactly one cam rocker arm that runs partially wall-to-wall with a valve rocker arm and a second, exhaust-side assembly, with two cam rocker arms that enclose a valve rocker arm (see Fig. 1 ). Both assemblies run on a common axle piece on the cylinder. One e-actuator is assigned to the first assembly and two e-actuators (one e-actuator per cam rocker arm) are assigned to the second assembly. The respective cross-coupling mechanisms in the assemblies each consist of a piston-like coupling slide, which is acted upon directly by the e-actuators in one direction, with a return being effected via compression spring force.

The task is to create a carrier module with simplified actuators.

According to the invention, this object is achieved by the new features of claim 1. According to this, a displacement of the respective coupling slide of the assembly is brought about in at least one direction via pressure oil, which is fed from a central channel through the axle piece, from which a transverse channel branches off in the assembly through the axle piece, which at least indirectly communicates with a longitudinal channel in one of the rocker arms which leads to a pressure chamber in front of an end face of the coupling slide, with a control slide having a blocking and a release area for the pressure oil from the transverse channel being installed in a guide of the axle section that intersects the transverse channel, and with at least one E-actuator is attached, via which the control slide can be displaced in at least one direction.

The invention is based on the fact that, in the case of the carrier module, recourse is had to resources that are already present in the cylinder head of the heavy-duty internal combustion engine, such as a central channel carrying pressurized oil for lubricating contact points in the valve train. The respective coupling slide is thus hydraulically actuated directly in one direction, with metering of the hydraulic medium pressure being produced via a control slide directly assigned to it in the carrier module, which cleverly lies preferably longitudinally in the axle piece.

A particular advantage here is that the e-actuator is installed stationary and individually on the carrier module, so that it cannot be moved during operation, which, for example, makes its power supply line extremely simple and durable. Each cylinder can be switched individually. Signaling at the e-actuator, which can also act in both longitudinal directions, occurs independently of the cam position.

It is clear that hydraulic displacement of the respective coupling slide on both sides is also possible. In this case, additional pressure oil paths and actuators would have to be applied to the module accordingly.

The carrier module can be installed on the intake and/or exhaust valve side in the cylinder head for each cylinder. Two gas exchange valves, for example, can also be actuated simultaneously, at least indirectly, via the valve rocker arm (bridge) and it is also intended to provide plug-in elements with hydraulic valve clearance compensation in the valve rocker arms, which are supplied via the central channel in the axle piece.

Instead of one coupler slide in each of the receptacles, a coupler slide package can also be provided in the receptacles, with only one coupler slide each extending over the separating area between the two rocker arms in the case of coupling.

Provision is made for the carrier module to be kept ready, at least as far as possible, externally preassembled and then to be assembled on the cylinder head. The latter should experience as few changes as possible when using the variable cylinder head module.

According to a further development of the invention, the e-actuator per assembly is on an outer end face of the axle piece, extending parallel to it. fastened, but under certain circumstances can also sit at least in sections in the axle piece, which accommodates a compact design of the module. In addition, the e-actuator can also be perpendicular to the axle section and act on the control slide via deflection means. As explained, the e-actuator does not follow the pivoting movement of the rocker arms.

In a more specific embodiment of the invention, a cup piece is proposed, which sits on an outer end face of the axle piece. On the one hand, this pot piece, e.g. in sheet metal design, simply closes the central channel. On the other hand, the e-actuator is cleverly accommodated and held in a protective manner in a shape of this. A screw connection is proposed for simple fastening of the cup piece, with the screw engaging in a mating thread at the end in the central channel. Instead of the screw connection, for example, a pin connection or the like can also be considered.

The parallel control slide integrated in the axle section, which is therefore also stationary, has two simple, consecutive control areas. On the one hand, it has a groove as a release area and, on the other hand, an outer jacket section as a blocking area for the pressure oil, which is conducted from the central channel via a transverse channel that intersects it. Under certain circumstances, the control slide can also perform a rotational movement or a screwing movement. When the e-actuator is switched to a de-energised/low-current state, the control slide is reset by means of compression spring force. The compression spring can be mounted in front of an end face of the control slide that is remote from the actuator or can surround it at least in sections and can be supported on an annular collar of the control slide.

According to a further development of the invention, a displacement of the coupling slide in its decoupling direction into a receptacle of one of the two rocker arms of the respective assembly is provided via the pressure oil released by the control slide and a provision of this via compression spring force. Equally, however, consideration is given to moving the coupling slide hydraulically into its coupling position.

The rocker arm which receives the coupling slide in the decoupling case has a receptacle remote from the coupling, in which a compression spring is seated which acts on a front end of the coupling slide which is remote from the coupling in the coupling direction. If necessary, which saves axial space, the compression spring can also encase the respective coupling slide at least in sections and in this way be supported on the coupling side by an annular collar or the like.

In addition, it is provided to apply a ring bushing in the receptacle of the coupling slide housing the coupling slide during decoupling, between which and an annular face of the coupling slide the pressure chamber is formed, the coupling slide running with a stepped ring area in the ring bushing. Corresponding chamfers or the like guarantee that pressure medium can enter from the longitudinal channel when the coupling slide is initially in contact with the annular bush. Of course, the pressure chamber can also be located axially behind/in front of the coupling slide.

Finally, a dependent claim relates to an expedient transfer of the pressure oil present in the central channel to the respective coupling piston. An annular groove-bore transition is contemplated here, with the annular groove or an annular groove segment advantageously being introduced into a bore of the respective rocker arm that encompasses the axle piece.

• 1 zeigt eine räumliche Ansicht auf das Trägermodul mit einlassseitiger Baugruppe;
• 2 zeigt die Baugruppe wie vorgenannt, jedoch aus anderem Blickwinkel;
• 3 zeigt einen Schnitt durch das Trägermodul gemäß den Schnittlinien A-A der 1 und
• 4 zeigt eine räumliche Seitenansicht auf den Ventilkipphebel.

About the drawing:

• 1 shows a three-dimensional view of the carrier module with an assembly on the inlet side;
• 2 shows the assembly as above, but from a different angle;
• 3 shows a section through the carrier module according to the section lines AA 1 and
• 4 shows a spatial side view of the rocker arm.

From the 1 until 3 shows a carrier module 1 for a switchable valve train of a heavy-duty internal combustion engine. The carrier module 1 is to be delivered as far as possible preassembled externally to a cylinder head of the internal combustion engine and installed there.

It can be seen in the 1 until 3 an axle piece 2 with bores 38. The axle piece 2 and thus the support module 1, alone or together with a support plate, are screwed to the cylinder head via the latter.

The carrier module 1 here comprises an assembly 3 with a cam rocker arm 4 and a valve rocker arm 5 directly next to the cam rocker arm 4. Both rocker arms 4, 5 can be pivoted relative to one another. The rocker arm 4 is like that 1 , 2 disclose contacted by a cam 39 of a camshaft 40 at one end. The valve rocker arm 5 acts at its (rear) longitudinal end facing away from the camshaft 40 on a gas exchange valve in the stroke direction.

The rocker arms 4, 5 are laterally adjacent to one another over a portion 6. In this section 6 seated, here on a long side on the camshaft side (according to the 1 , 2 in front of the axle piece 2), a coupling mechanism 7 with a receptacle 8, 9 parallel to the axle piece in each rocker arm 4, 5. As shown in more detail 3 As can be seen, a coupling slide 10 runs in the receptacle 9 of the valve rocker arm 5. This is drawn in its coupled position, in which it runs in sections in the receptacle 8 of the cam rocker arm 4.

A displacement of the coupling slide 10 in its decoupling position in the receptacle 9 takes place via pressure oil. This is fed from a central channel 11 through the axle section 2 (see Fig. 3 ). A transverse channel 12 branches off radially from the central channel 11 in the section of the valve rocker arm 5 in the axle piece 2 . This in turn is connected to a longitudinal channel 13 in the valve rocker arm 5 . -The longitudinal alignment of the last-mentioned channel in the valve rocker arm 5 refers to the longitudinal extension of the valve rocker arm 5.- The longitudinal channel 13 starts from an annular groove segment 34 in its bore 42 on the axle piece 2, from what 4 is evident. The ring groove segment 34 in turn is fed from a radial passage 35 in the axle piece 2 that is present as a bore.

As in 3 drawn, the transverse channel 12 in the axle piece 2 is intersected by a guide 16 running parallel to the central channel 11 and starting from an outer end face 21 of the axle piece 2 . In this guide 16, a control slide 17 runs longitudinally movable with a blocking and a release area 18, 19 for the pressure oil. These areas 18, 19 are present as ring sections 24 (groove) and 25 (outer jacket section). As can be seen, the radial passage 35 in the axle section 2 is blocked by the control slide 17 .

A switching of the control slide 17, and thus a release or blocking of the pressure oil, takes place via an e-actuator 20. The latter is located in front of an outer face 21 of the axle piece 2 and acts via its anchor 23 on a free face 22 of the control slide 17 in its retraction direction . When the e-actuator 20 is energized, its armature 23 moves the control slide 17 into its guide 16 against the force of a return spring 42, which is supported on a base of the guide 16, and the pressure oil in the transverse channel 12 is released via the Ring section 24 of the control slide 17 in the longitudinal channel 13 in the valve rocker arm 5 to the coupling slide 10.

The latter has, as well as from 3 shows a stepped ring portion 32 on the side of the cam rocker arm 4. About this it runs in a ring bushing 43 in the receptacle 9, which is directly at a mouth of the receptacle 9 before a parting plane between the rocker arms 4, 5. A pressure chamber 14 for the pressure oil, which is intersected by the longitudinal channel 13, is formed axially between the annular bushing 43 and an annular face 33 of the coupling slide 10 to the offset annular section 32. When the pressure oil is released as described above, it enters the pressure chamber 14 and, when the cam base circuit passes through, the coupling slide 10 is displaced into its receptacle 9 and thus the two rocker arms 4, 5 are decoupled from one another, as a result of which the cam lift no longer affects the gas exchange valve is transferred.

The coupling slide 10 is reset by means of a compression spring means 29 in the form of a helical compression spring. Behind the coupling slide 10, the receptacle 9 also has a bottom outlet 37 for air or oil. Another exit 36 is in 2 drawn. This also serves to allow air or oil to escape, here from the guide 16 behind the control slide 17.

Finally goes out 2 , 3 shows that on the outer face 21 of the axle piece 2 there is a cap 26 made of sheet metal, which is held on the outer face 21 of the axle piece 2 by a screw 28 joined to the central channel 11 in the axle piece 2 . The screw 28, together with the cap 26, seals the central channel 11 and the entire end face area there. At the same time, the cap 26 has a one-piece attached formation. The e-actuator 20 is protected in this.

4 , previously mentioned, shows the rocker arm 5 as a detail. A receptacle 41 for a leg of a cam return spring, not explained in detail, can be seen, which is present here as a torsion spring and is braced between the two rocker arms 4, 5.

Reference List

1)

carrier module

2)

axle piece

3)

module

4)

Cam rocker arm, rocker arm

5)

Valve rocker arm, rocker arm

6)

subarea

7)

coupling mechanism

8th)

recording

9)

recording

10)

coupling slider

11)

central channel

12)

cross channel

13)

longitudinal channel

14)

pressure room

15)

Forehead

16)

guide

17)

spool

18)

restricted area, area

19)

release area, area

20)

e-actuator

21)

outer forehead

22)

Forehead

23)

anchor

24)

ring section

25)

ring section

26)

cap

27)

molding

28)

screw

29)

compression spring means

30)

outer forehead

31)

reason

32)

ring section

33)

ring forehead

34)

ring groove segment

35)

radial passage

36)

exit

37)

exit

38)

drilling

39)

lifting cam

40)

camshaft

41)

recording

42)

drilling

43)

ring bushing

QUOTES INCLUDED IN DESCRIPTION

This list of the 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

• DE 102020113222 [0003]

Claims (9)

Cylinder-specific carrier module (1) for a switchable valve train of a heavy-duty internal combustion engine, with an axle piece (2) which has at least one assembly (3) with at least one cam rocker arm (4) and a valve rocker arm (5) next to the cam rocker arm (4), pivotable relative to one another, which rocker arms (4, 5) rest against one another over a partial area (6), in which a coupling mechanism (7) with a receptacle (8, 9) parallel to the axis piece is seated in each rocker arm (4, 5), one of the receptacles ( 9, 8) a coupling slide (10) which can be displaced in sections into the receptacle (8, 9) of the other rocker arm (5, 4) for coupling the rocker arms (4, 5), which displacement in at least one direction via pressure oil is accomplished, which is led from a central channel (11) through the axle piece (2), from which a transverse channel (12) branches off through the axle piece (2) in the assembly (3), which is connected to a longitudinal channel (13) in a the rocker arm (5, 4) is at least indirectly connected, which leads to a pressure chamber (14) in front of an end face (15) of the coupling slide (10), with a control slide (17) with a blocking and a release area (18, 19) for the pressure oil from the transverse channel (12) is installed and at least one e-actuator (20) is attached to the carrier module (1) for each assembly (3), via which the control slide (17) is displaceable in at least one direction. carrier module claim 1 , wherein the e-actuator (20) is seated on an outer end (21) of the axle piece (2), the guide (16) of the control slide (17) running parallel to the central channel (11) in the axle piece (2) and from its outer end ( 21) and wherein an end (22) of the control slide (17) facing the outer end (21) is acted upon in the retraction direction by an armature (23) of the e-actuator (20). carrier module claim 1 or 2 , wherein the control slide (17) has at least two consecutive ring sections (24, 25), of which one ring section (24) is a groove forming the release area (19) and the other ring section (25) is an outer jacket section forming the blocking area (18). . carrier module claim 2 , A cap (26) being attached to the outer end face (21) of the axle piece (2), in or on which the e-actuator (20) is held. carrier module claim 4 , wherein the cap (26) has a one-part or multi-part attached formation (27) with the e-actuator (20) in it. carrier module claim 4 or 5 , wherein the cap (26) is fixed to the outer end face (21) of the axle piece (2) via a screw (28)/pin attached to the central channel (11) in the axle piece (2). carrier module claim 1 , wherein a displacement of the coupling slide (10) in its decoupling direction via the pressure oil and its return in the coupling direction via a compression spring means (29) are accomplished. carrier module claim 7 , wherein the compression spring means (29), designed as at least one helical compression spring, bears against an outer end face (30)/ring collar of the coupling slide (10) remote from the coupling, which at the other end rests on a base (31) of the receptacle (9, 8) of the rocker arm (5, 4th ) is supported with the coupling slide (10), the coupling slide (10) having a stepped ring section (32) on the coupling side, which is guided in a ring bushing (43) in its receptacle (9, 8), axially between which ring bushing (43) and an annular end face (33) of the coupling slide (10) to the offset annular section (32) of the pressure chamber (14) fed by the longitudinal channel (13) for the pressure oil and which annular end face (33) forms the end face (15). carrier module claim 2 , wherein the longitudinal channel (13) in the rocker arm (5, 4) starts from an annular groove segment (34) / an annular groove in its bore (42) on the axle piece (2), which / which is in fluid connection with a radial passage (35) of the axle section (2), the radial passage (35) being closable on the one hand by the blocking area (18) of the control slide (17) and on the other hand releasable by the release area (19) of the control slide (17) in such a way that the transverse channel (12) in the Axle piece (2) is in pressure oil connection with the longitudinal channel (13) in the rocker arm (5, 4).

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