EP2859198A1

EP2859198A1 - Valve multi-lift module and actuation system comprising said module

Info

Publication number: EP2859198A1
Application number: EP13723879.6A
Authority: EP
Inventors: Nicolas Gelez; Julien Hobraiche; Benoît MAURICE; Gabriel KOPP
Original assignee: Valeo Systemes de Controle Moteur SAS
Current assignee: Valeo Systemes de Controle Moteur SAS
Priority date: 2012-05-14
Filing date: 2013-04-26
Publication date: 2015-04-15
Also published as: CN104662265A; WO2013171392A1; FR2990465B1; FR2990465A1

Abstract

The invention relates to a multi-lift module (100) for a valve of an engine, comprising: a multi-lift assembly for the valve of an engine, said assembly including a cavity and an electromagnetic actuator (14) positioned and maintained at least partially in the cavity and comprising a pin that can move between two positions, namely a first position, known as the retracted position, in which it is arranged to allow a first valve lift performed by an actuation member and a second position, known as the projecting position, in which it is arranged to allow a second valve lift performed by the actuation member, said assembly also comprising means for adjusting the retracted position in the cavity; and a bed plate (10) produced as a single piece and intended to be mounted in the cylinder head of an engine, said bed plate (10) including a main plate (20) extending substantially along a plane and at least one housing (12) produced in an arm (11) extending from the main plate (20), said housing (20) being configured to receive, at least partially, the multi-lift assembly in order to define a valve lift performed by the actuation member.

Description

MULTIPLE VALVE LIFTING MODULE AND ACTUATION SYSTEM

COMPRISING THIS MODULE

The invention relates to a multiple valve lift assembly. In particular, the assembly comprises an electromagnetic actuator participating in a multiple valve lift system.

Typically, an engine comprises an engine block delimiting chambers or cylinders of combustion having one end closed by a cylinder head and an opposite end closed by a piston slidably received in the cylinder. Each combustion cylinder is associated with air intake and air intake means and also with burners, respectively comprising inlet and outlet valves. 'exhaust.

The efficiency of the combustion engines depends in particular on the efficiency of the cylinders, in particular their filling rates in an air / fuel mixture. Indeed, the overall efficiency of a cylinder, that is to say its ability to produce a torque by consuming a certain amount of fuel, increases with the amount of air / fuel mixture in the cylinder, in other words with its rate of filling by air. Thus, in order to improve the efficiency of the combustion engines, it is preferable to maintain the engine in the operating zones in which the filling rate of the rolls is maximum.

However, in the case of a low engine load, a combustion engine control system passes only the amount of air necessary to ensure the load of the engine. This has the effect of pumping the engine and degrading engine performance.

In order to extend the optimum operating zone, especially when the engine is operating at half load, it is known to disconnect (or deactivate) part of the combustion cylinders in such a way as to increase the filling rate of the combustion cylinders remaining activated and to minimize pumping losses. The disconnection of the combustion cylinders is obtained inter alia by disconnecting or neutralizing the intake and exhaust valves of said cylinders, that is to say immobilization in the closed position of the valves.

The strategy of cylinder disconnection is therefore to reduce the number of active cylinders of a combustion engine so that these cylinders are placed on a better point of output to produce the same torque requested the engine. Valve actuation systems are known comprising an actuator which converts a rotational movement of a cam into a closing and opening movement of the valve. It is also known to use an electromagnetic actuator which disconnects the actuating member with the valve in order to neutralize it.

No. 6,441,261 discloses a valve actuation system in which the actuating member has a first portion which bears on the valve and a second portion which is in contact with a rotary cam. An electromagnetic actuator is used to make the two parts integral or uncoupled from each other. When the two parts are secured, the movement of the cam is transmitted to the valve. When the two parts are decoupled, the motor can not be transmitted to the user. The electromagnetic actuator is not carried by the actuating member, but is positioned in a housing formed in the engine cylinder cover. More specifically, the electromagnetic actuator comprises a moving part. This movable piece bears on a rod which is connected to the second part to make the first and second parts integral. When the piece of im in ue its pressu the rod, cel it is pushed by a spring so as to disengage the first part. However, the electromagnetic actuator is subject to dispersions in the positions of the elements in the engine, related to mounting in the engine for example. As a result, the moving part may not have sufficient travel to press the rod and put it into the coupling position of the first and second parts.

It is therefore sought an electromagnetic actuation valve disconnection system taking into account dispersions in the positioning of the engine elements.

For this purpose, it is proposed a multiple valve lift assembly of an engine, said assembly comprising

a cavity;

an electromagnetic actuator placed and maintained at least partially in said cavity and comprising a pin movable between at least two positions:

- A first position, called "retracted position", in which it is configured to allow a first lift of the valve made by an actuating member; and a second position, called "projecting position", in which it is configured to allow a second lift of the valve made by said actuating member;

the assembly further comprising means for adjusting the retracted position in the cavity.

In particular, in the retracted position, the pin is introduced further into the cavity than in the sail position, in which the pin makes it relatively more protuberance with respect to the cavity.

The actuator may determine a zero lift of the valve such that the valve remains on its seat despite the cam. The actuator then allows a selective disconnection of the actuating member with the valve. The actuator may also allow an intermediate lift between zero lift and maximum lift of the valve.

Thanks to the adjustment means, it is ensured that the actuator is always positioned so that the pin can come into contact with the actuating member to ensure a multiple valve lift. Thus, the electromagnetic actuation is tolerant to dispersions related to the positioning of the elements in the engine, in particular the elements of the valve actuation system.

By modifying the retracted position of the pin, the adjustment means make it possible to adjust the pin relative to the actuating member. In particular, if the electromagnetic actuator allows a displacement of the pin over a given distance, the adjustment of the retracted position ensures that at this distance the pin is in a projecting position in which it allows the second lift valve.

For example, the cavity may be defined by an inner wall of a jacket comprising the electromagnetic actuator.

According to a variant, the electromagnetic actuator comprises a jacket in which the pin is movable in translation.

According to a variant, the liner comprises a first stop defining the retracted position.

According to a variant, the liner is received in translation in the cavity, the retracted position of the pin being defined by the position of the liner in said cavity.

Thus, controlling the position of the liner in the cavity controls the retracted position of the pin, and thereby the protruding position, for a predetermined distance between the retracted and protruding positions. Consequently, it is easy to ensure that the pin comes into contact with the actuating member when it is in the projecting position and that a good operation of the second lift is achieved. The liner provides a simple means for adjusting the position of the retracted pin position.

According to a first embodiment, the adjustment means comprise at least a portion of the liner.

According to a variant of the first embodiment, the adjustment means comprise corresponding threaded portions on an outer face of said portion of the liner and on an inner face of a wall defining the cavity.

The assembly according to the first embodiment can therefore be used to adjust the retracted position of the pin by turning the sleeve.

According to a second embodiment, the actuator further comprises a nut held in said cavity and comprising a through hole which allows a passage of the gou pil to determine the valve lift performed by the actuating member.

According to a variant of this second embodiment, the liner comprises at least one second abutment abutting against said nut and an elastic return element now in contact with said second abutment with the nut.

According to a third embodiment of the assembly, the actuator further comprises a nut held in said cavity, and the first stop of the sleeve bears against said nut; the liner comprising an elastic return element which keeps said first abutment in contact with the nut.

According to a variant of the second and third embodiments, the adjustment means comprise at least a portion of the nut.

According to a variant of the second and third embodiments, the adjustment means comprise corresponding threaded portions on the outer face of said portion of the nut and on an inner face of a wall defining the cavity.

The second and third embodiments allow the retracted position of the pin to be adjusted by rotating the nut without having to rotate the liner. The invention further relates to a module comprising a plate intended to be mounted in the cylinder head of an engine, said plate comprising:

a main plate extending substantially in a plane;

at least one housing configured to at least partially receive an assembly according to the invention for determining a valve lift performed by an actuating member,

said platen being made in one piece.

According to a variant, the housing extends along an axis substantially parallel to the plane.

According to a variant, the at least one housing of the plate is made in an arm extending from the plate.

According to one variant, the wall of the housing defines the cavity of the assembly.

The invention also relates to a multiple valve lift module of an engine comprising:

a multiple valve lift assembly of an engine, said assembly comprising:

a cavity,

- A first position, called "retracted position", in which it is configured to allow a first lift of the valve made by an actuating member; and

a second position, called "projecting position", in which it is configured to allow a second lift of the valve made by said actuating member;

the assembly further comprising means for adjusting the retracted position in the cavity

- a plate made in one piece intended to be mounted in the cylinder head of a moteu r, the ite dish comprising a plu nle pl aq ue extending substantially in a plane; and at least one housing made in an arm extending from the plate, said housing being configured to at least partially receive the multiple lift assembly to determine a valve lift performed by said actuator.

Thanks to the arm of the plate, which is connected to the plate of the plate, one gets a grip facilitated by an operator when mounting the electromagnetic actuator using the plate. Indeed, the plate provides an area by which to hold the plate, while the arm allows to bring the actuator of its actuating member to be in its operative position. By combining with the adjustment means of the electromagnetic actuator, the plate allows a simplified mounting of an electromagnetic actuator in a valve actuation system, in particular a multiple lift system.

The invention also relates to a system for actuating at least one valve comprising:

an actuator configured to transmit a movement of a cam to said valve:

a module according to the invention;

system in which the electromagnetic actuator of the module is arranged to determine the valve lift performed by the actuating member.

According to a variant, the actuating member comprises:

a first part intended to bear on the valve,

a second part intended to come into contact with a rotating cam, a disengageable element for selectively connecting the first and second parts, said disengageable element being such that

when the pin is in its first position, the disengageable element disconnects the first and second parts to allow a first lift of the valve;

when the pin is in its second position, the pin presses the disengageable member to connect the first and second portions to allow a second lift of the valve.

According to a variant, the actuation system further comprises a disengageable abutment configured to constitute a support for the actuating member in order to transmit the movement of the cam to the valve,

the disengagable abutment having two parts and a disengageable element for selectively connecting the first and second parts, said disengageable element being such that when the pin is in its first position, the disengageable element disconnects the first and second parts to allow a first lift of the valve;

Alternatively, the retracted position of the pin is adjusted so that a gap is between the pin and said disengageable member when the disengageable member disconnects the first and second portions.

In the prior art, the pin and the disengageable element are always in contact, which promotes their wear. Due to the space between the pin and the disengageable element, the wear in the multi-lift actuation system is limited.

Other features and advantages of the invention will appear on reading the description of the embodiments of the invention given by way of example and with reference to the appended figures which show:

- Figure 1, a perspective view of an example of platinum to be mounted in the cylinder head of an engine;

- Figure 2, another perspective view of the plate shown in Figure 1;

FIG. 3, a first example of a multiple valve lift assembly;

FIG. 4, a second example of a multiple valve lift assembly;

FIG. 5, a third example of a multiple valve lift assembly;

FIG. 6, a perspective view of a module comprising the plate of FIG. 1 and electromagnetic actuators;

FIG. 7 is a perspective view of a first example of a valve actuation system comprising the module illustrated in FIG. 6;

- Figure 8, a sectional view of the actuating system illustrated in Figure 7;

- Figure 9, a sectional view of a second example of an actuating system comprising a module according to the invention;

- Figure 10, a sectional view of a third example of an actuating system comprising a module according to the invention. Figures 1 and 2 show an example of plate 10 to be mounted in the cylinder head of an engine.

The plate 10 comprises four housings 1 2 configured to each receive at least partially an electromagnetic actuator. The electromechanical actuator is used for the selective disconnection of an actuator with a valve. The plate 1 0 is realisée a single l thus forming a simple element for mounting the actuators, unlike the prior art in which the mounting of the actuators requires the establishment of several elements.

The plate 10 comprises a main plate 20 allowing a grip of the plate 1 0 by an operator. The housings 12 extend along an axis A which is substantially parallel to a plane P defined by the plate 20.

The plate 10 comprises four arms 1 1 in which are formed the housings 12 for receiving the electromagnetic actuators. The arms 1 1 extend from the plate 20. In particular, the arms 11 are situated at the periphery of the plate 20. Preferably, the arms 11 extend in a transverse direction with respect to FIG. plane P defined by the plate 20 so as to move away from the operator when the plate is in the mounting position in the cylinder head, that is to say in the position shown in Figure 1. Thus, a difference in level between the housings 12 and the plate 20 is obtained which makes it possible to position the actuators contained in the housings in front of their respective actuating member, while allowing the operator to maintain the plate via the intermediary of the plate 20.

The plate 10 includes portions 24 arranged to attach to the cylinder head of the engine. The plate 20 may comprise the fixing portions 24. For example, the fixing portion 24 comprises a machining of the plate 20 forming a well 25. The bottom of the well 25 is formed of a wall 25a comprising a hole 25b into which a rod can be introduced to hold the plate 10 in the cylinder head.

The plate 10 may comprise reinforcing ribs 22 in order to reinforce its mechanical strength, as represented in FIG. 2. These ribs 22 extend in particular on one face of the plate 20. The arms 11 may also comprise ribs 22, in particular in a connection zone with the plate 20.

The plate 10 further comprises electrical conductors 17 intended to power the electromagnetic actuators. The electrical conductors 17 are, for example, metal blades overmolded in the material of the plate 10. The electrical conductors may be tracks 17 fixed to the surface of the plate 10. In particular, the electrical conductors 17 start from a predefined point of the plate 20 to be each conveyed to a housing 12 to supply an electromagnetic actuator. A connector (not shown) can be used to connect the electrical conductors 17 of the plate with an external power supply.

For example, platen 10 is about 20 cm long and 12 cm wide. The plate 1 0 may be aluminum or plastic or any other non-ferromagnetic material.

The assemblies 48, 49, 50, 51 illustrated in FIGS. 3 to 5 and 8 constitute systems for adjusting the position of the actuator 14.

FIG. 3 shows a longitudinal cross-sectional view of a first example of an electromagnetic actuator 14, and an example of an electromagnetic actuator 14.

The electromagnetic actuator 14 comprises a pin 56 movable in translation in a liner 60. The pin 56 comprises at least a portion 56a whose periphery is aj ustée to the inner wall of the lane 60 so as to allow the pin to be held. 56 in the liner 60 while allowing translational movement of the pin 56 in the liner 60.

The pin 56 is movable in translation under the effect of a magnetic field created by a coil 59. The coil 59 is for example a coil made in or around the jacket 60 so as to surround the pin 56.

An elastic element such as a spring 57 is included between the pin 56 and a first stop of the liner 60. In FIG. 3, the first stop corresponds to the bottom 60a of the liner 60. However, the first stop could be a shoulder on the inner wall of the shirt 60.

When it is desired to disconnect the valve, the coil 59 creates a magnetic field which attracts the pin 56 into the interior of the channel 60, compressing the spring 57. The pin 56 is in a first position. position, called "retracted position", defined by the first stop, here the bottom 60a of the sleeve 60. The retracted position also depends in other magnetic field exerted by the coil 59 and spring stiffness and preload 57.

When it is desired to reconnect the valve, the field of the coil 59 is interrupted. The pin 56 is subjected to a force exerted by the spring 57 from the bottom 60a of the liner 60 and slides outwardly from the liner 60 to occupy a second position, said "projecting position". In this second position, the pin 56 leaves the jacket 60 to connect an actuating member. For example, in the second position, the pin 57 can abut on a locking member of the actuator for reconnecting the valve. The second position may depend on the stiffness and preload of the spring 57. The second position also depends on the environment of the assembly 50.

The electromagnetic actuator 14 is received in a cavity 54. For example, the cavity 54 is defined by an inner wall 52 of a cylinder 53 surrounding the jacket 60. The jacket 60 is received in translation in the cavity 54.

The cavity 54 is defined by the internal face of a wall 52. The wall 52 comprises a threaded portion 58 that corresponds to a threaded portion 58 'situated on an outer face of a portion 60c of the jacket 60. The portion 60c of the jacket 60 takes the form of a ring of diameter greater than the diameter of the other portions of the jacket 60. But the portion 60c which has the threaded portion 58 'could have the same diameter as the rest of the jacket. These threaded portions 58, 58 'make it possible to adjust the position of the liner 60 in the cavity 54 by rotating the liner on itself. Thus, the positioning of the retracted position in the cavity 54 is modified, which makes it possible to obtain a desired projecting position of the pin 56 with respect to the cavity 54. Thus, the axial position of the actuator 14 changes, but the stroke of the pin 56 remains unchanged regardless of the setting.

The chimney 60, and by extension the electromechanical neutral action 14, is held in the cavity 54 by the threaded portions 58, 58 'and by a portion 52a of the wall 52 fitted to the outer wall of the jacket. 60. The portion 52a fitted to the wall 52, however, allows the translation of the jacket 60.

FIG. 4 shows a cross-sectional view of another example of a valve assembly 51 comprising a electromagnetic neutral action 1. The electromagnetic actuation of the pin 56 in the jacket 60 is identical to that described for the assembly 50 illustrated in FIG.

In this set 51 of disconnection, the electromagnetic actuator 14 further comprises a nut 62 held in the cavity 54. The nut 62 comprises a through hole 62a which allows passage of the pin 56 for the selective disconnection of the actuating member. The through hole 62a receives a portion 60d of the liner 60c. The liner 60 includes a second stop 60b formed of an annular ring extending from the outer wall of the liner 60. The second stop 60b could be a shoulder extending from the liner 60. The liner 60 could then carry several seconds stops 60b on a peripheral line. The second stop 60b is held against the nut 62 by a spring 64 positioned between the second stop 60b and the portion 52a of the wall 52 fitted to the sleeve 60. Thus, the sleeve 60 is constantly held against the nut 62 by the intermediate of the second stop 60b and the spring 64.

On its periphery, the nut 62 comprises threaded portions 58 "which correspond to the threaded portions 58 of the inner face of the wall 52 defining the cavity 54. As in the assembly 50 illustrated in FIG. 3, the threaded portions 58, 58 "allow to adjust the position of the liner 60 in the cavity 54. However, in the assembly 51 of Figure 4, only the nut 62 rotates on itself. The nut 62 can therefore move in the cavity 54. The liner 60 follows the displacement of the nut 62 through the spring 64 and the second stop 60b. Thus, the position of the retracted position in the cavity 54 is changed without rotating the liner 60 on itself. The assembly 51 makes it possible to obtain a desired retracted position of the pin 56 with respect to the cavity 54 without having to turn all the elements of the actuator 14.

The jacket 60, and by extension the electromagnetic actuator 14, is held in the cavity 54 by the portion 52a fitted to the wall 52. The retention of the jacket 60 in the cavity 54 is improved by the portion 60d of the jacket 60 extending into the through hole 62a, which cooperates with the nut 62 held by the threaded portions 58, 58 ".

FIG. 5 shows a sectional view of a third example of a valve disconnect assembly 49 comprising an electromagnetic actuator 14. The electromagnetic actuation of the pin 56 in the jacket 60 is identical to that described for the illustrated assembly 50 in FIG. 3. As in the disconnection assembly 51 illustrated in FIG. 4, the electromagnetic actuator 14 comprises a nut 62 held in the cavity 54. However, in the examples of FIGS. 4, the bottom 60a of the liner 60 is on the side of the fitted portion 52a; and the pin 56 enters and exits the liner 60 through one end of the cavity which is opposed to the fitted portion 52a. In the example illustrated in FIG. 5, the bottom 60a of the liner 60 is on the side of the end of the cavity which is opposed to the fitted portion 52a; and the pin 56 enters and exits the liner 60 through a hole defined by the fitted portion 52a.

More particularly, the assembly 49 of FIG. 5 does not include a second stop. The first abutment, here the bottom 60a of the liner 60, bears against the nut 62. The bottom 60a may comprise one or more shoulders 60e extending beyond the nominal diameter of the liner 60 in order to constitute a bearing surface between the sleeve 60 and the nut 62. A spring 64 positioned between the first stop, in particular the shoulder 60e, and the adjusted portion 52a keeps the first stop 60a in contact with the nut 62. Thus, the liner 60 is constantly held against the nut 62 via the first stop 60a and the spring 64.

The pin 56 enters and leaves the jacket 60 for the selective disconnection of the actuating member through the hole defined by the portion 52a adjusted. This hole receives a portion 60d of the shirt 60.

The position of the retracted position in the cavity 54 is made with the nut 62 without rotating the sleeve 60 on itself, as explained for the example of FIG. 4.

The liner 60, and by extension the electromagnetic actuator 14, is held in the cavity 54 by the fitted portion 52a of the wall 52 and the portion 60d of the liner 60 extending into the hole defined by the fitted wall 52a.

A fourth example of a disconnect assembly 48 is shown in a disconnection system 200 illustrated in FIG. 8. The disconnection assembly 48 is similar to the second example shown in FIG. 4. However, the disconnecting assembly 48 has variations in shape that can be incorporated in the examples of FIGS. 3 to 5.

In particular, the shapes of the second abutment 60b and the nut 62 are configured to improve the retention of the chimney 60. For this purpose the second abutment 60b extends beyond the surface 62g of the nut 62. formed along a longitudinal plane of the liner 60. Thus, in the example of FIG. 4, the liner 60 may not include portion 60d entering the hole 62a of the nut 62 and have a configuration similar to that described above. Such a configuration could also be introduced between the first stop 60a and the nut 62 of the assembly 49 of FIG.

The pin 56 comprises a shoulder 56b which comes against a stop 62b formed in the nut 62. The shoulder 56b and the stop 62b determine the projecting position of the pin 56. In the assemblies 49, 50, 51 of FIGS. the abutment 62b could be formed in the liner 60, for example in the portion 60d with respect to the assembly 51 of Figure 4, or in the portion 60c with respect to the assembly 50 of Figure 3.

Actuator 14 of assembly 48 is further configured to enhance electromagnetic actuation. In particular, the pin 56 comprises a portion 56c having an obviously substantially frustoconical in a long longitudinal direction. The liner 60 comprises a substantially conical portion 60f terminating in a cylinder 60g. By introducing into the substantially frustoconical portion 56c of the pin 56, the portions 60f, 60g of the liner 60 improve the loopback of the magnetic field generated by the coil 59 in the pin 56.

Figure 6 shows a valve disconnection module 100 which comprises the plate shown in Figures 1 and 2 provided with several sets 48 disconnection.

In the plate 10, the wall of the housing 12 defines the cavity 54 of the set 51 of disconnection. However, the cavity 54 could be defined by an inner wall of a second chimney comprising the electromagnetic actuator 14. This second jacket would be mounted in the housing 12. In FIG. 6, the housings 12 are preformed and the electromagnetic actuators 14 are inserted into their respective slots 1 2. The electromagnetic actuators 14 could be overmolded by the material of the arms January 1, this could be particularly the case when the cavity 54 is defined by the inner wall of the second sleeve.

The module 100 comprises an electronic circuit 18 which comprises components for the control of the electromechanical actuators 14. The components are, for example, MOSFET transistors, capacitors, resistors. The electronic circuit 1 8 may also include components for pulse width modulation generation for the actuators 14.

FIG. 7 and FIG. 8 respectively show a perspective view and a sectional view of an actuating system 200 comprising the module 100 illustrated in FIG.

The system 200 comprises an actuator in the form of a rocker arm 202. The rocker arm 202 comprises a first portion 202 which bears on a valve (not shown). The first portion 202a contacts the valve through a dispensing clearance adjusting screw 203 which is held tight in the first portion 202a by a nut 203a. The rocker arm 202 includes a second portion 202b that engages a rotating cam (not shown). In particular, the second part 202b comprises a roller bearing 205 which can be rotated by the rotary cam so as to mimic the friction of the cam. The roller bearing 205 is rotated relative to the second portion 202b by the rollers 206.

The two parts 202a, 202b are mounted on a ramp 209 which keeps the rocker arm 202 in the cylinder head while allowing the two parts 202a, 202b to rotate about the ramp 209. The ramp 209 preferably has the shape of a hollow cylinder in order to minimize the weight of the motor and to ensure the lubrication of the actuating member 202. The actuating member 202 is lubricated for example by means of a hole 208. The plate 1 0 is fixed on the ramp 209 for holding the first 202a and second 202a parts. In particular, the wall 25a of the well 25 forming a fixing portion bears on a flat portion 209a of the ramp 209. The plate 10 is fixed by means of a screw introduced into the hole 25b of the pu 25 and a through hole 209b of the ramp 209.

The first portion 202a includes a portion that is received in the second portion 202b. A disengageable element formed by a rod 210 makes it possible to selectively disconnect the parts 202a, 202b of the rocker 202. The rod 210 is received in a housing of the second part 202b and can be introduced into the first part 202a to connect the two parts 202a 202b so that movement of the cam is transmitted to the valve via the rocker 202.

More particularly, the pin 56 is mounted to press the rod 210. When the pin 56 is in the projecting position or connection position, it pushes the rod 210 into the first portion 202a by pressing on it. When the pin 56 is in the retracted position or disconnect position, the rod 210 is pushed from the first portion 202a by a spring 21 1. What disconnects the first part 202a of the second part 202b. The movement of the cam is no longer transmitted to the valve. Only the second portion 202b is movable under the action of the cam. The first portion 202a includes a bore 214 for receiving a biasing member for returning the second portion 202b and for maintaining a contact between the second portion 202b and the cam.

When pushed by the spring 21 1, the rod 210 is retained by a capsule 212. The capsule 212 comprises an opening 21 1 a which allows the passage of the pin 56 but not the passage of the rod 21 0. Thanks to adjustment means 58, 58 ', 58 ", the stroke of the pin is adjusted so that there is a space between the pin 56 and the rod 210 when the pin 56 is in the disconnected position.

Thus, in its retracted position, the pin 56 is no longer in contact with the rod 210. The second part 202b of the rocker arm can therefore rotate under the effect of a profile of the cam, without causing wear between the pin 56 and the rod 210.

FIG. 9 shows an example of a disengageable abutment 301 that can be used as a fulcrum for an actuating member such as a latch forming part of an actuating system. In the context of a valve actuation by latch, it is known to use a play catch stop 302a and arrange it opposite one side of the pawl while the valve is disposed opposite the Another side of the latch, these two sides of the inguet being separated by the contact zone of a cam with the pawl.

The disconnection assembly 51 then serves to selectively disconnect the pawl with the valve via the disengageable abutment 301.

The disengageable abutment 301 comprises, for example, a body 302b and a play-catching abutment 302a. The stop 301 further comprises a disengageable element having for example the shape of a hollow cylinder 310 receiving a return element 31 1. The biasing member 31 1 exerts a force to move the roll 31 0. The pin 56 secures or disengages the body 302b and the clearance take-up stop 302a in an operation similar to that of the actuating system illustrated in FIGS. 8. Thus, in a position, the cylinder 31 1 is introduced into the body 302b and secures the body 302b and the catch stop 302a so that the stop 301 forms a fixed support for the pawl. In another position, the cylinder 30 0 desol idarise the body 302b and the clearance catch 302a, so that the catch stop 302a can slide in the body 302b. A pawn 303 used to indexing in rotation the catching stop 302a and the body 302b, then slides in a groove 304 of the body 302b. A return element (not shown) located between the retraction abutment 302a and the bottom of the body 302b makes it possible to return the retraction abutment 302a to its initial position when the pawl no longer bears on the pawl.

Figure 10 shows in schematic form a third example of an actuating system 402 according to the invention. The system 402 is a direct drive system which comprises a first pusher 402a, a second pusher 402b and a disengageable element for example in the form of a rod 410. The disengageable element 410 is movable between a position in which it solidifies the first 402a and the second 402b pushers, and a position in which the first 402a and the second 402b pushers are not secured. The system 402 includes the module with the assembly 51. The pin 56 is configured to move the disengageable member 410 from one to the other of said positions.

Of course, the invention is not limited to the examples described.

The plate 10 may comprise a different number of housings 12.

In particular, the means for adjusting the valve disconnection assembly 50, 51 may be other than threads 58, 58 ', 58 ". For example, the adjustment may be carried out by means of a snap or any other means for adjusting the position of the actuator 14 in the cavity 54.

The disconnection module 100 could be provided with any electromagnetic actuator 14 for selective disconnection of the actuating member 202 with the valve.

The disengageable elements described can be used in all examples of actuating systems.

According to the examples described above the plate, the module and the assembly are integrated in an actuation system configured to disconnect a valve, that is to say allow zero lift. However, the actuating system according to the invention does not necessarily disconnect the valve, the actuating system can allow an intermediate valve lift in a manner known per se. For example, an intermediate lift is described in patent application US5454353A.

Claims

1. A multiple valve lift module (100) of an engine comprising: - a valve lift assembly (49, 50, 51) of an engine, said assembly (49, 50, 51) comprising:

a cavity (54),

an electromagnetic actuator (14) placed and maintained at least partially in said cavity (54) and comprising a pin (56) movable between at least two positions:

- A first position, called "retracted position", in which it is configured to allow a first lift of the valve made by an actuating member (202, 402); and

a second position, called "projecting position", in which it is configured to allow a second lifting of the valve carried out by said actuating member (202, 402);

the assembly (49, 50, 51) further comprising adjusting means (58, 58 ', 58 ") for the retracted position in the cavity (54)

- A plate (10) made in one piece to be mounted in the cylinder head of a motor, said plate (10) comprising a plate (20) main extending substantially in a plane (P); and at least one housing (12) formed in an arm (1 1) extending from the plate (20), said housing (20) being configured to at least partially receive the lift assembly (49, 50, 51) multiple for determining a valve lift performed by said actuator (202, 402).

Module (100) according to claim 1, wherein the electromagnetic actuator (14) comprises a liner (60) in which the pin (56) is movable in translation.

The module (100) of claim 2, wherein the liner (60) includes a first stop (60a) defining the retracted position.

4. Module (100) according to claims 2 or 3, wherein the liner (60) is received in translation in the cavity (54), the retracted position of the pin (56) being defined by the position of the liner (60) in said cavity (54).

5. Module (100) according to one of claims 2 to 4, wherein the adjusting means comprise at least a portion (60c) of the jacket (60).

6. Module (100) according to claim 5, wherein the adjusting means comprise corresponding threaded portions (58, 58 ') on an outer face of said portion (60c) of the jacket (60) and on an inner face of a wall (52) defining the cavity (54).

The module (100) according to one of claims 2 to 4, wherein the actuator (14) further comprises a nut (62) held in said cavity (54) and including a through hole (62a) which allows a passing the pin (56) to determine the valve lift performed by the actuator (202, 402).

8. Module (100) according to claim 7, wherein the liner (60) comprises at least a second stop (60b) bearing against said nut (62) and an elastic return element (64) maintaining contact with said second stop (60b) with the nut (62).

The module (100) according to claim 3 or 4, wherein the actuator (14) further comprises a nut (62) held in said cavity (54), and wherein the first stop (60a) of the sleeve ( 60) abuts against said nut (62), the sleeve (60) comprising an elastic return element (64) which keeps said first stop (60a) in contact with the nut (62).

10. Module (100) according to one of claims 7 to 9, wherein the adjusting means comprise at least a portion of the nut (62).

1 1. Module (100) according to claim 10, wherein the adjusting means comprise corresponding threaded portions (58, 58 ") on the outer face of said portion of the nut (62) and on an inner face of a wall ( 52) defining the cavity (54).

12. Module according to one of the preceding claims, wherein the housing (12) extends along an axis (A) substantially parallel to the plane (P).

13. Module (100) according to one of the preceding claims, wherein the at least one housing (12) of the plate (10) is.

14. Module (100) according to one of the preceding claims, wherein the housing wall (12) defines the cavity (54) of the assembly (49, 50, 51).

15. Actuating system (200) of at least one valve comprising:

an actuating member (202, 402) configured to transmit a movement of a cam to said valve:

- A module (100) according to one of the preceding claims;

system (200) wherein the electromagnetic actuator (14) of the module (100) is arranged to determine the valve lift performed by the actuator (202, 402).

The actuating system (200) of claim 16, wherein the actuating member (202) comprises:

a first part (202a, 402a) intended to bear on the valve, a second part (202b, 402b) intended to come into contact with a rotary cam,

a disengageable element (210, 410) for selectively connecting the first (202a, 402a) and second (202b, 402b) parts, said disengageable element (210, 410) being such that

when the pin (56) is in its first position, the disengageable member (210, 410) disconnects the first (202a, 402a) and second (202b, 402b) portions to allow a first lift of the valve;

when the pin (56) is in its second position, the pin (56) presses on the disengageable member (210, 410) so as to connect the first (202a, 402a) and second (202b, 402b) portions to allow a second lift of the valve.

The actuation system of claim 15, further comprising a disengageable abutment (301) configured to provide support for the actuating member for transmitting the movement of the cam to the valve,

the disengageable stop (301) having two portions (302a, 302b) and a disengageable member (310) for selectively connecting the first (302a) and second (302b) portions, said disengageable member (310) being such that

when the pin (56) is in its first position, the disengageable member (310) disconnects the first (302a) and second (302b) portions to allow a first lift of the valve;

when the pin (56) is in its second position, the pin (56) presses the disengageable member (310) to connect the first (302a) and second (302b) portions to allow a second lift of the valve.

18. System according to one of claims 16 or 17, wherein the retracted position of the pin (56) is adjusted so that a space is between the pin (56) and said disengageable member (21 0, 310, 41 0) when the disengageable element (210, 310, 410) disconnects the first (202a, 302a, 402a) and second (202b, 302b, 402b) parts.