DE102016208470A1 - Arrangement for the storage of at least one valve drive element - Google Patents

Abstract

The invention relates to an arrangement for mounting at least one valve drive element (2, 2a, 2b) on a component (1) of an internal combustion engine, the arrangement comprising at least two longitudinal channels (8, 9; 8, 9a; 8a, 9a; 13a, 13b, 13c, 14a, 14b, 14c, 14d) for groupwise and / or alternating supply of a pressurized fluid to the at least one valve drive element (2, 2a, 2b). The invention has for its object to achieve a more cost-effective production of such an arrangement while increasing the degrees of freedom with respect to the number of possible oil flow paths. The solution to this problem is that the component (1) of the internal combustion engine is a component of a cylinder head or an engine block of the internal combustion engine, that the component (1) at least one longitudinal bore (4) for supplying a pressurized fluid to the at least one valve drive element (2, 2a, 2b), that in the longitudinal bore (4) a separating element (10; 11; 12; 13; 14) is arranged, which comprises the at least two longitudinal channels (8,9; 8,9a; 8a, 9a; 13a, 13b , 13c, 14a, 14b, 14c, 14d) and / or forms together with the longitudinal bore (4) that the at least one valve drive element (2, 2a, 2b) is arranged in a receiving bore (3), and that the receiving bore ( 3) for the passage of the pressure fluid to at least one valve drive element (2, 2a, 2b) via at least one radial bore (15, 16, 17, 18) is connected to the longitudinal bore (4).

Description

The invention relates to an arrangement for mounting at least one valve drive element on a component of an internal combustion engine, wherein the arrangement has at least two longitudinal channels for groupwise and / or alternating supply of a pressurized fluid to at least one valve drive element.

Such an arrangement is known from DE 195 35 498 A1 bekant. It is a mounted on a plurality of bearing blocks on a cylinder head of an internal combustion engine hollow axle for the pivotal mounting of rocker arms for controlling gas exchange valves of the internal combustion engine. The interior of the hollow axis is divided by a slide-in profile into two fluid-filled chambers. The chambers serve to guide lubricating oil for controlling coupling elements of a valve lift control device.

Is in an internal combustion engine with overhead camshafts no hollow axle for the storage of rocker arms or rocker arms available, but in particular shift rocker be based on the one hand in the cylinder head on support elements and on the other hand at the ends of Ventilschäften, the control of Schaltschlepphebelfunktion means of a pressurized fluid, as a rule by means of the engine lubrication oil, these switchable valvetrain components require more than just a lubricating oil supply with an increase in desired shift strategies. The state of the art is the oil supply of the switchable valve train components via separately introduced channels in the cylinder head. As the number of parallel oil paths increases, the diameter of these oil paths must inevitably be reduced to a minimum for space reasons. This leads for example to manufacturing problems in the holes for the oil paths, since these holes are long holes with a small diameter, the rigidity of the drill is low and the positional accuracy of the holes is affected accordingly. Often, a hydraulic valve clearance compensation function is integrated into the switchable valve train components, which requires additional oil paths in the cylinder head.

Against this background, the invention has for its object to achieve a more cost-effective production of the described arrangement while increasing the degrees of freedom in terms of the number of possible oil paths.

This object is achieved with an arrangement for supporting at least one valve drive element on a component of an internal combustion engine, wherein the arrangement has at least two longitudinal channels for groupwise and / or alternate supply of a pressurized fluid to at least one valve drive element, characterized in that the component of the internal combustion engine is a component of a Cylinder head or an engine block of the internal combustion engine is that the component has at least one longitudinal bore for supplying a pressurized fluid to the at least one valve drive element, that in the longitudinal bore a separating element is arranged, which has the at least two longitudinal channels and / or forms together with the longitudinal bore the at least one valve drive element is arranged in a receiving bore, and in that the receiving bore for the passage of the pressurized fluid to the at least one valve drive element is connected to the longitudinal bore via at least one radial bore t.

By this arrangement, the cutting cylinder head machining is reduced to a relatively large diameter central bore, which is easy to produce. The division of the oil paths within this bore by means of there separately to be arranged components.

According to a manufacturing technology favorable embodiment, it is provided that the at least one receiving bore for a valve drive element with respect to the longitudinal bore in the component is substantially perpendicular. Angle between the longitudinal bore and the respective receiving bore in the range of 45 ° to 90 ° are also acceptable. For applications in a Boxer engine, angles greater than 90 ° are also possible.

The separating element used in said longitudinal bore can consist of a central web which divides the longitudinal bore into a first longitudinal channel and a second longitudinal channel and which is fixed in the longitudinal bore by means of a press fit.

Another embodiment of the dividing element used in the longitudinal bore may consist of a inserted into the longitudinal bore, in particular pressed-in tube with a the inner space of the tube dividing into two longitudinal channels central web.

If more than two longitudinal channels are required for the function of the internal combustion engine, the separating element inserted into the longitudinal bore may consist of a tube inserted into the longitudinal bore with a plurality of webs dividing the interior of the tube into a corresponding number of longitudinal channels, radially tapered to each other.

According to a variant for two longitudinal channels, the separator used in the longitudinal bore of a tubular profile with at least one longitudinally extending and extending from its outer jacket radially inwardly extending depression, which forms the longitudinal channel with the longitudinal channel, wherein the second longitudinal channel is formed by the remaining interior of the tubular profile.

With a tube profile of the last-mentioned type more than three longitudinal channels can be formed when the tube profile has circumferentially distributed three or more, a cloverleaf-like cross-section resulting indentations, which form longitudinal channels with the longitudinal bore. The remaining interior of the pipe profile forms a further longitudinal channel in this case.

The tubes and / or the tube profiles may preferably be made by extrusion or extrusion of a plastic or light metal material, which results in a weight advantage by the invention.

It can further be provided that the at least one longitudinal bore is present in a component of the internal combustion engine designed as a cylinder head, and that the at least one valve drive element is arranged in a receiving bore extending at a distance from the longitudinal bore, into which the radial bores open for the passage of the pressurized fluid.

In the receiving bore of the cylinder head, a valve drive element may be arranged in the form of a support element for a shift rocker arm, via which the pressure fluid is guided to the shift rocker arm. In this formed as a supporting element valve drive element may also be integrated a hydraulic valve clearance compensation function, wherein the pressure fluid for the shift toggle lever function and for the valve play compensation function via separate radial bores of the at least two longitudinal channels is supplied to the valve drive element designed as a support element.

To avoid oil leakage, the separating elements can be closed at the end or sealed against the cylinder head. In order to avoid faulty circuits as a result of pressurized fluid transfer, pressure relief cross sections to the surrounding atmosphere can be provided in the cylinder head between receiving bores for the hydraulic support elements. A particularly advantageous embodiment, which allows to transmit a hydraulic control signal without connecting channels directly to the partition member in the form of a pipe or a pipe profile, results when the separating element is directly connected to a hydraulic control member, such as a solenoid valve.

Furthermore, volume-flow-modulating and / or pressure-modulating functions can be integrated into a separating element in the form of tubes or tube profiles, for example by arranging throttle cross-sections and / or non-return valves.

In this context, it is also possible to form the longitudinal channels with the same or different cross sections, for example by the separating elements are dimensioned differently.

The invention is explained below with reference to several illustrated in the accompanying drawings embodiments. In the drawing shows

1 a perspective view of an arrangement for mounting a plurality of valve train elements in a component of an internal combustion engine,

2 a perspective view of a separating element in the form of a tube,

3 a perspective view of a component in the form of a part of a cylinder head of an internal combustion engine,

4 a side view of the valve drive element in the form of a support element with integrated hydraulic lash adjuster function,

5 a schematic cross-sectional view of two longitudinal channels formed by a separating element in a longitudinal bore,

6 a schematic cross-sectional view of a longitudinal bore with inserted therein tube profile as a separating element,

7 a schematic cross-sectional view of an insertable into the longitudinal bore, divided by a transverse web in two longitudinal channels tube,

8th an embodiment of the tube according to 7 with three longitudinal channels, and

9 a tube profile with by three, a cloverleaf-like cross-section indentations.

From a cylinder head of an internal combustion engine is in 1 a partial view of a component 1 shown, which mounting holes 3 for receiving valve train elements 2a . 2 B having. These valve train elements 2a . 2 B serve as support elements for each pair of switching rocker arm 5 , of which, as the structure repeats, only one pair of cam followers 5 with his two Switching finger followers 5a . 5b is described. Accordingly, the two shift rocker arms are based 5a . 5b with its one end on the valve drive elements designed as supporting elements 2a . 2 B as well as with their opposite ends on the lever arms near ends of valve stems of associated gas exchange valves 6a . 6b from.

In the presentation according to 1 It may be either an arrangement for supporting a plurality of valve train elements of a four-cylinder internal combustion engine, each with an inlet gas exchange valve and a Auslassgaswechselventil, or it may also be a four-cylinder internal combustion engine with four intake gas exchange valve pairs and not shown four Auslaßgaswechselventilpaaren. The details of the illustrated rocker arms 5a . 5b are not the subject of the present invention and are known per se to a person skilled in the art.

In the component 1 is a longitudinal bore 4 designed to supply the valve train elements 2a . 2 B with a pressurized fluid. This pressurized fluid is preferably also used for engine lubrication oil.

From the 1 and 3 it is evident that areas 7a . 7b . 7c of the component 1 between the mounting holes 3 for the valve drive elements 2 are designed as cutouts. As a result, weight is saved and space for the arrangement of other components created. in these areas 7a . 7b . 7c can the longitudinal bore 4 be at least partially interrupted and the separating elements at least partially outside of the component 1 lie.

In 3 is one in the 2 and 7 illustrated separating element 12 in the form of a tube with a transverse central web 12a shown. The mounting holes 3 for the valve drive elements 2a . 2 B and the right-angled longitudinal bore 4 are dimensioned in this embodiment in terms of their diameter and their distance so that they overlap slightly. Therefore, the valve train elements 2a . 2 B in the assigned mounting holes 3 to use, has the tubular separator 12 in the outer circumference to the valvetrain elements 2a . 2 B geometrically complementary, concave frankings 12c in which in each case an associated valve drive element 2a . 2 B engages and so in the assembled state of the valve train elements 2a . 2 B a torsion and displacement protection for the tubular separator 12 result.

In the area of postage stamps 12c runs in the middle one through the middle bridge 12a formed parting line 12b above which one of a first longitudinal channel 8a in the tubular separating element 12 outgoing first radial bore 15 empties. Accordingly, one of one opens below the middle bridge 12a formed second longitudinal channel 9a in the tubular separating element 12 outgoing second radial bore 16 in the postage 12c below the dividing plane 12b ,

If the longitudinal channel 8a pressurized fluid is applied, this pressurized fluid passes over all first radial bores 15 to a first group of valvetrain elements communicating therewith 2a and from there, for example, supported therefrom first groups of Schaltschlepphebelpaaren 5 This places it in a zero-stroke mode or a low-lift mode for the two gas exchange valves 6a . 6b a gas exchange valve pair can be switched to operate the internal combustion engine fuel economy at partial load. The same is true when the first longitudinal channel 9a pressurized fluid is applied, so that this pressurized fluid over all second radial bores 16 to a second group of valve drive elements communicating therewith 2 B and from there to a supported second group of rocker arm pairs 5 This also leads to a zero-stroke mode or a low-stroke mode for the corresponding pairs of gas exchange valves 6a . 6b can be switched. In particular, it is possible to switch several partial load stages, if the first group of shift finger lever pairs 5 is configured to switch between a full-lift mode and a low-lift mode, while the second group of shift cam lever pairs 5 is configured to switch between a full-stroke mode and a zero-stroke mode.

For example, if the first group of rocker arm pairs 5 switch between a full-lift mode and a low-lift mode while the second group of shift cam lever pairs 5 switch between a full-stroke mode and a zero-stroke mode, the switching states can be combined so that by alternating and equal pressurization of the two longitudinal channels 8a . 9a four power levels can be set.

In 2 is yet another arrangement of radial bores 17 . 18 shown in pairs one above the other with the first longitudinal channel 8a or with the second longitudinal channel 9a are connected. This arrangement is for a valve drive element 2 as it is in 4 is shown suitable. This valve drive element 2 is a support element, in which a hydraulic valve clearance compensation function is integrated. Such hydraulic valve lash adjusters are well known and, for example, in the DE 10 2014 215 422 A1 described. They are not the subject of the present invention.

This in 4 illustrated valve drive element 2 has a first circumferential groove 19 with a first radial bore 19a inside the valve drive element 2 on, creating a connection from the first longitudinal channel 8a over the radial bore 17 in the component 1 to the valve drive element 2 and from there to an associated rocker arm 5a . 5b a pair of switching rocker arms 5 is set up. Becomes the first longitudinal channel 8a acted upon with pressurized fluid, switching the associated Schaltschlepphebels occurs 5a of the switching cam follower pair 5 from a full-lift mode to a low-lift mode or a zero-lift mode.

The second longitudinal channel 9a in the component 1 or in the separating element 12 is constantly pressurized with pressurized fluid through the second radial bore 18 and the second circumferential groove 20 as well as in the second radial bore 20a to the valve clearance compensation mechanism in the valve drive element 2 regardless of whether the first longitudinal channel 8a pressurized fluid is applied or not.

It can be seen that for the first longitudinal channel 8a and for the second, separate longitudinal channel 9a independently controllable pressure fluid connections on the component 1 must be provided, which can be designed as solenoid valves. These solenoid valves, not shown, are located at a suitable location on the component 1 arranged and can establish or interrupt a connection to the pressure oil circuit of the internal combustion engine.

During the independent pressurized fluid loading of the first longitudinal channel 8a and the second longitudinal channel 9a from one end of the tubular separator 12 is possible and any distribution of the two radial bores 15 and 16 over the length of the tubular separator 12 is permitting alternate pressurization of fluid through the other two radial bores 17 and 18 only possible if the first longitudinal channel 8a approximately in the middle by means of a partition wall 12d is closed. This partition 12d is in 2 shown with a dashed line. As a result, an independent Druckfluidbeaufschlagung of each axial end of the first longitudinal channel 8a possible, and thus they are each with one half of the tubular separator 12 in fluid connection standing Schaltschlepphebel independently switchable.

The 2 and 7 show a tubular separator 12 with a transverse and central middle bridge 12a However, the middle bridge can 12a also be arranged eccentrically to the first longitudinal channel 8a a larger or smaller cross-section than the second longitudinal channel 9a to give.

A structurally simple solution, a first longitudinal channel 8th and a second longitudinal channel 9 in the longitudinal bore 4 in the component 1 form, is designed as a flat band middle bar 10 as a separating element in the longitudinal bore 4 of the component 1 contribute. For safe positioning, the longitudinal bore 4 have opposite longitudinal grooves, in which the longitudinal edges of the central web 10 be guided.

According to the 6 and 9 are the dividers 11 respectively 14 designed as tubular profiles. The designed as a pipe profile separator 11 according to 6 is with a longitudinal indentation 11a provided, whereby a first longitudinal channel 8th between the separator formed as a tubular profile 11 and the hole 4 is formed while a second longitudinal channel 9a through the remaining interior of the formed as a tubular profile separating element 11 runs.

The separator designed as a tubular profile 14 of the 9 has three circumferentially distributed, a cloverleaf-like cross-section resulting indentations 14 * . 14 ** . 14 *** on, along with the longitudinal bore 4 a total of three longitudinal channels 14a . 14b . 14c form, while the remaining interior of the pipe profile 14 another longitudinal channel 14d can form. In this embodiment, there are thus four independently acted upon with pressure fluid longitudinal channels 14a . 14b . 14c . 14d available, which may be required depending on desired switching strategies.

To avoid oil leakage, the separating elements 11 . 12 . 13 . 14 closed at the end or against the component 1 be sealed. This in 8th shown in schematic cross-section separating element 13 is tubular and has three radially inwardly projecting, in the center of the separating element 13 meeting footbridges 13 * . 13 ** . 13 *** , As a result, the separating element has 13 a total of three longitudinal channels 13a . 13b . 13c on.

In order to avoid faulty circuits due to pressure fluid transfer, can be in the component 1 between the mounting holes 3 for the valve drive elements designed as hydraulic support elements 2a . 2 B Provide pressure relief cross sections towards the surrounding atmosphere.

The invention extends not only to switchable cam follower valve drives with single-flow support elements, but can also be used with switchable cam follower valve drives with double-flow support elements 2 according to 4 be used.

Furthermore, the invention is not limited to valve trains with Schaltschlepphebeln, but is applicable to all types of switchable valve trains, such as switchable bucket tappets, switchable hydraulic support elements and switchable roller tappet.

All the features mentioned in the preceding description of the figures, in the claims and in the introduction to the description can be used both individually and in any combination with one another. The invention is thus not limited to the described and claimed feature combinations, but all feature combinations are to be regarded as disclosed.

LIST OF REFERENCE NUMBERS

1

 Component of a cylinder head of an internal combustion engine

2, 2a, 2b

 Valve train element

3

 Mounting bores for valve train elements

4

 Longitudinal bore in the component

5

 Switching rocker arm pairs

5a

 First shift cam follower of a pair of cam follower levers

5b

 Second shift rocker arm of a pair of rocker arm levers

6a

 First gas exchange valve of a gas exchange valve pair

6b

 Second gas exchange valve of a gas exchange valve pair

7a-7c

 Areas of the component between the mounting holes

8th

First longitudinal channel in the longitudinal bore 4

8a

First longitudinal channel in a tubular separating element 12

9

Second longitudinal channel in the longitudinal bore 4

9a

Second longitudinal channel of a tubular separator 11 . 12

10

Middle bar in the longitudinal bore 4 , Separating element

11

 As a pipe profile trained separating element

11a

Indentation in the separating element 11

12

 Tubular separator

12a

Middle web in the tubular separating element 12

12b

Parting plane in the tubular separating element 12

12c

 clearances

12d

Vertical partition in the tubular partition 12

13

 Tubular separating element with three longitudinal channels

13a

First longitudinal channel of the separating element 13

13b

Second longitudinal channel of the separating element 13

13c

Third longitudinal channel of the separating element 13

13 *

First radial web of the separating element 13

13 **

Second radial web of the separating element 13

13 ***

Third radial web of the separating element 13

14

 Tubular separator with four longitudinal channels

14a

First longitudinal channel of the separating element 14

14b

Second longitudinal channel of the separating element 14

14c

Third longitudinal channel of the separating element 14

14d

Fourth longitudinal channel of the separating element 14

14 *

First indentation on the separating element 14

14 **

Second indentation on the separating element 14

14 ***

Third indentation on the separating element 14

15

First radial bore in the separator 12 to the first longitudinal channel 8a

16

First radial bore in the separator 12 to the second longitudinal channel 9a

17

Second radial bore in the separator 12 to the first longitudinal channel 8a

18

Second radial bore in the separator 12 to the second longitudinal channel 9a

19

First circumferential groove in the valve drive element 2

19a

Radial bore for switching function in the valve drive element 2

20

Second circumferential groove in the valve drive element 2

20a

Radial bore for valve clearance compensation in the valve drive element 2

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 19535498 A1 [0002]
• DE 102014215422 A1 [0037]

Claims (10)

Arrangement for mounting at least one valve drive element ( 2 . 2a . 2 B ) on a component ( 1 ) of an internal combustion engine, wherein the arrangement has at least two longitudinal channels ( 8th . 9 ; 8th . 9a ; 8a . 9a ; 13a . 13b . 13c ; 14a . 14b . 14c . 14d ) for the groupwise and / or alternate supply of a pressurized fluid to the at least one valve drive element ( 2 . 2a . 2 B ), characterized in that the component ( 1 ) of the internal combustion engine is a component of a cylinder head or an engine block of the internal combustion engine that the component ( 1 ) at least one longitudinal bore ( 4 ) for supplying a pressurized fluid to the at least one valve drive element ( 2 . 2a . 2 B ), that in the longitudinal bore ( 4 ) a separating element ( 10 ; 11 ; 12 ; 13 ; 14 ) is arranged, which the at least two longitudinal channels ( 8th . 9 ; 8th . 9a ; 8a . 9a ; 13a . 13b . 13c ; 14a . 14b . 14c . 14d ) and / or together with the longitudinal bore ( 4 ) forms that the at least one valve drive element ( 2 . 2a . 2 B ) in a receiving bore ( 3 ) is arranged, and that the receiving bore ( 3 ) for the passage of the pressurized fluid to the at least one valve drive element ( 2 . 2a . 2 B ) via at least one radial bore ( 15 . 16 ; 17 . 18 ) with the longitudinal bore ( 4 ) connected is. Arrangement according to claim 1, characterized in that the receiving bore ( 3 ) for the at least one valve drive element ( 2 . 2a . 2 B ) in relation to the longitudinal bore ( 4 ) in the component ( 1 ) is substantially perpendicular. Arrangement according to claim 1, characterized in that in the longitudinal bore ( 4 ) used separating element ( 10 ) from a longitudinal bore ( 4 ) into a first and a second longitudinal channel ( 8th . 9 ) dividing middle bridge exists. Arrangement according to claim 1, characterized in that in the longitudinal bore ( 4 ) used separating element ( 12 ) from one into the longitudinal bore ( 4 ) inserted tube with a the interior of the tube in two longitudinal channels ( 8a . 9a ) dividing middle bar ( 12a ) consists. Arrangement according to claim 1, characterized in that in the longitudinal bore ( 4 ) used separating element ( 13 ) from one into the longitudinal bore ( 4 ) with a plurality of tube, the interior of the tube in a corresponding number of longitudinal channels ( 13a . 13b . 13c ) dividing, radially converging webs ( 13 * . 13 ** . 13 *** ) consists. Arrangement according to claim 1, characterized in that in the longitudinal bore ( 4 ) used separating element ( 11 . 14 ) of a tubular profile with at least one longitudinally extending and from its outer jacket radially inwardly extending indentation ( 11a ), which with the longitudinal bore ( 4 ) the first longitudinal channel ( 8th ), while through the remaining interior of the tubular profile of the second longitudinal channel ( 9a ) is formed. Arrangement according to claim 4, characterized in that the tube profile of the separating element ( 14 ) circumferentially distributes three or more impressions resulting in a cloverleaf-like cross section (US Pat. 14 * . 14 ** . 14 *** ), which with the longitudinal bore ( 4 ) Form longitudinal channels, and that the remaining interior of the tubular profile has a further longitudinal channel ( 14d ). Arrangement according to one of claims 1 to 5, characterized in that the separating element ( 10 ) or the tube profile of the separating element ( 11 . 12 . 13 . 14 ) is made by extrusion or extrusion of a plastic or light metal material. Arrangement according to one of claims 1 to 6, characterized in that the at least one longitudinal bore ( 4 ) in a component designed as a cylinder head ( 1 ) of the internal combustion engine is present, and that the at least one valve drive element ( 2 ) in the longitudinal bore ( 4 ) spaced running receiving bore ( 3 ) is arranged, in which the radial bores ( 15 . 16 ; 17 . 18 ) for the passage of the pressure fluid. Arrangement according to claim 7, characterized in that in the at least one receiving bore ( 3 ) a valve drive element ( 2 ) in the form of a support element for a shift rocker arm ( 5a . 5b ) is arranged, by means of which the pressure fluid to the shift rocker arm of the Schaltschlepphebelpaares ( 5 ) is guided.

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