DE102013204664A1 - Hydraulic support element - Google Patents

Abstract

A hydraulic support element (1) for a rocker arm of a valve train of an internal combustion engine is proposed, with a housing (2) which can be locked or arranged at least indirectly with respect to a receptacle of the internal combustion engine via its outer jacket (3) and into its bore (4) axially movable inner element (5) sits, which includes a storage space (6) for hydraulic fluid and with its head (7), which serves to support the rocker arm, projects above an upper edge (8) of the housing (2), with an underside (9) of the Inner element (5) and a bottom (10) of the housing (2) a high-pressure chamber (11) for the hydraulic medium is formed, which can be supplied with the hydraulic medium from the reservoir (6) via a check valve (13) applied to the underside (9) The head (7) of the inner element (5) has a hydraulic medium outlet (14) and the reservoir (6) in the inner element (5), at least over a large part of its length extension, is only shown as a riser hole (15), which is encompassed radially by a solid material ring (17) extending to an outer jacket (16) of the inner element (5).

Description

The invention relates to a hydraulic support element for a finger follower of a valve train of an internal combustion engine, with a housing which is at least indirectly locked or arrangeable over its outer jacket against a receptacle of the internal combustion engine and in the bore an axially movable inner member sits, which includes a reservoir for hydraulic means and with its serving as a support of the finger lever head overhanging an upper edge of the housing, between a bottom of the inner member and a bottom of the housing, a high-pressure chamber for the hydraulic medium is formed, which can be supplied via a bottom applied to the check valve with the hydraulic fluid from the reservoir and wherein the head of the inner member has a hydraulic fluid outlet.

A generic hydraulic support element, here switchable design, goes out of the DE 10 2007 011 892 A1 out. Evident is a hollow-walled inner element, which comprises a comparatively large reservoir for hydraulic means. In the head of the inner element is formed as a bore hydraulic fluid outlet. About the bore is a supply of a spray oil hole in resting on installation rocker arm for gating a cam contact area, which is present as a highly loaded rolling or sliding contact. In addition, via the hydraulic fluid outlet and a lubricating oil supply of the aforementioned storage can take place.

In particular, after a long stoppage of the internal combustion engine is thus expected that the storage space of the support element idles to hydraulic fluid. After a re-firing of the internal combustion engine there is the danger that hydraulic fluid is not immediately available for the spray oil supply of the highly loaded cam contact in the storage space, so that premature wear occurs in this area due to insufficient lubrication / dry friction.

A support element nichtschaltschaltbarer, "classic" design is in the DE 103 32 362 A1 disclosed.

It is an object of the invention to provide a support element as mentioned above, is ensured in particular by the stoppage of the internal combustion engine, a very fast supply whose hydraulic fluid outlet with hydraulic fluid.

According to the invention this object is achieved in that the storage space in the inner element, at least over a major part of its longitudinal extension, is shown only as a riser, which is radially surrounded by a reaching to an outer shell of the inner element massive material ring.

Thus, there is a support element of switchable or non-switchable nature, in which the aforementioned disadvantages are eliminated. This is simply realized by a drastic reduction of the storage space in the inner element without additional components.

The inner element, at least its axial section with the riser hole, can be comparatively solid. In other words, it can be dispensed with for the sake of simplicity to the formation of a cavity radially between the riser and an outer shell of the inner member. Non-cutting processes such as extrusion, MIM or thermoforming can be used to illustrate the interior element. Furthermore, the inner element can also be braced, wherein the riser hole can be drilled "classical".

Alternatively, it is conceivable and intended to thin-hollow-represent the inner element in the upper axial section and to reduce the storage space to create an insert on the inner shell, which has an axial bore for forming the riser. Possibly. can thus be used on previously executed inner elements, which helps to keep the component costs in check. Alternatively, a hollow-walled inner element of previous design may be used, in which a separate tube for the formation of the riser hole is installed, which tube is optionally not included in an additional space for hydraulic means.

Claim is further stated that immediately above the underside of the inner element is a radially enlarged annular space. In this, therefore, a sufficient amount of hydraulic fluid is accumulated for a subsequent sucking in the high-pressure chamber.

In a further development of the invention, it is provided to form the inner element according to the invention from two axial sections. This has manufacturing advantages. Possibly. know the axial sections also "loose" to each other. Preferably, however, these should be welded together, pressed, etc., so that sufficient rigidity is given in this section.

For a particularly rapid inflow of hydraulic fluid in the direction of the head of the inner element, it is proposed to position a lateral feed line so that it intersects the riser hole axially as close as possible to the head. Possibly. can also be two or more leads, for example. Another, which extends directly into the radially Storage space extends over the underside of the inner element.

In the event that the support element is switchable / disconnectable nature, it is proposed that this be installed via its housing in a piece of pipe or in a sleeve telescopically, which piece of pipe 1 which sleeve over its outer shell then sits firmly in a receptacle of the internal combustion engine.

The measures according to the invention can also be used with a roller tappet with hydraulic clearance compensation (bottom or lateral camshaft), via which roller tappet hydraulic fluid is conducted into a push rod actuated by the latter for forwarding to a rocker arm acted upon by this.

The invention is apparent from the drawing.

1 shows a longitudinal section through a support element according to the invention; here disconnectable type and

2 shows a support element according to the prior art.

Is shown in 1 a disconnectable, hydraulic support element 1 for a drag lever of a valve train of an internal combustion engine.

The disconnectable support element 1 consists of a pot-like housing 2 which over his outer coat 3 in a firmly installed in the engine sleeve 23 is arranged telescopically. About not to be explained coupling means 24 can the case 2 to show a complete valve lift with the sleeve 23 coupled state shown).

In a hole 4 of the housing 2 sits an axially movable inner element 5 , which a later explained in more detail pantry 6 for hydraulic means. A head 7 of the interior element 5 serves a pivotable support of the aforementioned rocker arm. With this area dominates the interior element 5 an upper edge 8th of the housing 2 ,

Between a bottom 9 of the interior element 5 and a floor 10 of the housing 2 is a high pressure room 11 formed for the hydraulic fluid. This is about one at the bottom 9 Applied check valve 13 with the hydraulic fluid from the storage room 6 supplied.

It can be seen that the head 7 of the interior element 5 designed as a bore hydraulic fluid outlet 14 having. This is used to forward a partial flow of hydraulic fluid to a pointed oil hole in the overhead drag lever, over which spray oil hole a highly loaded cam contact on the cam lever is lubricated / cooled. Moreover, in the case of a cam roller as a cam contact partner, it is possible to lubricate the bearing of the cam roller via the spray oil bore or a further outlet on the drag lever.

With the invention, the pantry 6 in the interior element 5 , at least over much of its longitudinal extent, only as a riser 15 represented and thus drastically compared to the prior art (s. 2 ) reduced. Thus lies between the riser 15 and an outer jacket 16 of the interior element 5 a solid material ring 17 in front. As stated at the outset, after a long standstill, the internal combustion engine and empty storage room reach 5 now very quickly hydraulic fluid through the hydraulic fluid outlet 14 in the head 7 to the consumption points in the overhead drag lever, without first the pantry 5 must be filled with a rumble volume of hydraulic fluid. The supply of these consumption points is thus prioritized over a supply of the high-pressure chamber 11 with hydraulic fluid.

As drawn, the riser goes 15 from the hydraulic fluid outlet 14 in the head 7 of the interior element 5 straight down. With her head far away 18 it flows into a directly above the bottom 12 of the interior element 5 lying and opposite the riser 15 radially expanded annulus 19 for the hydraulic fluid, which annulus 19 Provide a minimum supply of hydraulic fluid for proper clearance compensation.

The interior element 5 consists of two parts, namely a lower, essentially the annulus 19 comprehensive axial section 20 and a separate, upper axial section 21 , The latter has the riser hole 15 , The sections 20 . 21 are pressed together.

As can be seen, is a supply line 22 for the hydraulic fluid in the storage room 6 intended. This cuts radially the riser hole 15 and gets out of one of the sleeve 23 outgoing feeder 28 fed.

Out 2 goes a support element 25 according to the prior art. Its storeroom 26 in the interior element 27 is available as a comparatively large cavity.

LIST OF REFERENCE NUMBERS

1

supporting

2

casing

3

outer sheath

4

drilling

5

inner element

6

pantry

7

head

8th

edge

9

bottom

10

ground

11

High-pressure chamber

12

not forgiven

13

check valve

14

Hyraulikmittelaustritt

15

rising bore

16

outer sheath

17

material ring

18

The End

19

annulus

20

lower axial section

21

upper axial section

22

supply

23

shell

24

coupling means

25

Supporting element (St. d. Technology)

26

pantry

27

inner element

28

feed

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 102007011892 A1 [0002]
• DE 10332362 A1 [0004]

Claims (7)

Hydraulic support element ( 1 ) for a finger lever of a valve train of an internal combustion engine, with a housing ( 2 ), which over its outer jacket ( 3 ) at least indirectly relative to a receptacle of the internal combustion engine can be locked or arranged and in the bore ( 4 ) an axially movable inner element ( 5 ), which is a storeroom ( 6 ) for hydraulic means and with its support of the finger lever serving head ( 7 ) an upper edge ( 8th ) of the housing ( 2 ), wherein between an underside ( 9 ) of the inner element ( 5 ) and a floor ( 10 ) of the housing ( 2 ) a high pressure room ( 11 ) is formed for the hydraulic medium, which has a at the bottom ( 9 ) applied check valve ( 13 ) with the hydraulic fluid from the storage room ( 6 ) and wherein the head ( 7 ) of the inner element ( 5 ) a hydraulic fluid outlet ( 14 ), characterized in that the storage space ( 6 ) in the inner element ( 5 ), at least over a major part of its longitudinal extension, only as a riser ( 15 ) is shown, which radially from one to an outer shell ( 16 ) of the inner element ( 5 ) reaching massive material ring ( 17 ) is included. Supporting element according to claim 1, characterized in that the riser bore ( 15 ) from the hydraulic fluid outlet ( 14 ) in the head ( 7 ) of the inner element ( 5 ) runs straight ahead and with its head far end ( 18 ) in a just above the bottom ( 12 ) of the inner element ( 5 ) and opposite the riser ( 15 ) radially expanded annular space ( 19 ) opens for the hydraulic fluid. Supporting element according to claim 2, characterized in that the inner element ( 5 ) from a lower, essentially the annulus ( 19 ) comprehensive axial section ( 20 ) and a separate, upper axial section ( 21 ), which upper axial section ( 21 ) essentially the riser hole ( 15 ) Has. Supporting element according to claim 3, characterized in that the two axial sections ( 20 . 21 ) of the inner element ( 5 ) are pressed together or welded / soldered together. Supporting element according to claim 1 or 2, characterized in that a supply line ( 22 ) for the hydraulic fluid in the storage room ( 6 ) is provided, which radially the riser hole ( 15 ) cuts. Supporting element according to claim 1, characterized in that the inner element ( 5 ), at least in the upper axial section ( 21 ) with the riser hole ( 15 ), thin-walled-hollow, whereby the representation of the riser hole ( 15 ) is applied a separate insert with a central bore. Supporting element according to claim 1, characterized in that, in the case of the lockable housing ( 2 ), the supporting element ( 1 ) is a disconnectable support element, wherein the housing ( 2 ) in a / a firmly installed in the internal combustion engine sleeve ( 23 ) / Pipe section arranged telescopically and with this / this, to represent a full valve lift, in the axially apart state driven by coupling means ( 24 ) is selectively connectable.

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