DE102008062178A1 - Switchable bucket tappets - Google Patents

Abstract

Proposed is a switchable tappet (1), with an outer body (2) having a ring-like bottom (3), from the inner edge (6) leads away a hollow cylindrical projection (7) in the bore (8) to the outer body ( 2) relatively axially movable inner part (9) is guided, wherein in the cup tappet (1) coupling means (11) extend, in order to achieve a full valve lift, from a receptacle (12) of one of the components (9, 2) coming, in sections with a Mitnehmerfläche (13) of the respective other component (2, 9) are engageable, wherein between the components (2, 9) an anti-rotation (20) is applied, which sits in a window-like opening (21) of the projection (7) and engages with its inner side (23) in / on a complementary longitudinal groove / Längsanflachung (24) of the outer shell (16) of the inner part (9), which rotation (20) by tool engagement via a further aligned to this opening (22) in the radially opposite region of the hem of (5) is shown.

Description

Field of the invention

The The invention relates to a switchable bucket tappet for a valve train of an internal combustion engine, with an outer body, the a ring-like, for one Großhubnockenkontakt trained bottom has, from the outer edge of a hollow cylindrical Shirt protrudes, wherein from an inner edge of the bottom a hollow cylindrical Approach leads away, in the bore a relative to the outer body axially movable inner part out is, whose underside serves as a plant for a gas exchange valve, wherein coupling means in the bucket tappet to achieve a full valve lift at Nockengrundkreisdurchlauf optionally from a recording of one of the components coming in sections with a driving surface the other component, bridging an annular surface between them, in Engageable, wherein at a lower portion of an outer shell the inner part a ring element is fixed, on which one end a lost-motion spring supported is, the other end at least indirectly against a bottom of the Floor of the outer body acts and wherein applied between the components an anti-rotation that's in an opening sits the neck and with its inside in / on a complementary longitudinal groove / longitudinal flattening of the outer jacket of the inner part engages.

Background of the invention

One such bucket tappet is The expert world well known and need not be explained in detail here. Between its outer body and Inner part is a so-called "inner" against rotation. These serves mainly to, in the desired Coupling case, the inclusion of one of the components with the at least one Coupling means in flight to a driver surface in the other component to hold, so that a coupling is possible. Possibly comes the aforementioned anti-rotation also in a so-called Piston-in-ring groove coupling for carrying. As anti-rotation is in the prior art, for example, a separate needle, ball o. Like. Used in an opening the approach of the outer body sits and with its inside in a longitudinal groove of the outer jacket of the inner part engages.

Problematic is at this point a cost-effective production of the opening in Approach of the outer body. by virtue of the very small bore diameter of the neck, it is extremely difficult to over one Engaging a tool in the bore of the approach to represent the opening. Furthermore, there is the problem of mounting the rotation in the opening of the approach. This especially if the longitudinal groove in the outer sheath the inner part even before a bottom of the forehead of the inner part ends, so in the unspoken end of a ring part to one end support a lost-motion spring secure all-round secure. A simple telescopic Insert the inner part over the inner edge of the bottom of the outer part would be here only possible with difficulty be, as doing the inner part in collision with the radially projecting Anti-rotation would come.

Object of the invention

Of the Invention is therefore the object of a bucket tappet to provide the aforementioned type, in which the disadvantages listed are eliminated.

Solution of the task

According to the invention this Task solved by that the opening the hollow cylindrical approach window-like and by tool engagement on a to this aligned further opening in radially opposite Area of the shirt is shown.

Consequently there is a switchable bucket tappet, at the above-mentioned disadvantages are eliminated. proposed is now a tappet with an outer body whose opening is in the Simply approach through another opening in the shirt (in alignment), for example, by punching or drilling, is created. Consequently can rely on a very complex tool intervention be dispensed radially from the inside.

At least for the Case, but not exclusively, in which the longitudinal groove / longitudinal flat the inner part of a longitudinal extension which is not continuous in ground-away direction to in this End of a ring element for one-end support of a lost-motion spring To fix all-round, it is proposed, directly axial above an attachment of the ring member a mounting aperture display. above this becomes the inner part in the assembly process at maximum difference stroke of the outer body the anti-rotation body inserted into the then in-flight opening in the neck. Of the executed in the assembly Difference stroke exceeds however, the one the outer body is relative to to the inner part during operation (shutdown mode) of the bucket tappet.

Alternatively, the longitudinal groove / longitudinal flattening can also be "pulled through", so that the inner part can be mounted telescopically from above, with the anti-rotation device previously mounted in the opening of the attachment. In this case, there is no longer an undesirable influence such as bending an end region of the interior part.

Possibly are the measures according to the invention also with other switchable cam followers such as roller or mushroom tappets or with switchable support elements used.

According to one appropriate training the invention it is provided on relative stop the rotation with cam base circle run on an upper end of the longitudinal groove / longitudinal flat an aligned and optionally coupled play position of Recording in one component to represent the driving surface in the other component. Consequently can be on separate stop action like circlips, for example, on the outer jacket of the inner part are omitted.

Of the switchable bucket tappets can designed as a so-called "Hubabschalter" be. Communicates for this the bottom of the outer body with bspw. two adjacent high-lift cams. The bottom of the inner body can be a contact surface in this case with a so-called "Nullhubnocken" in contact is. If necessary, for the inner body also a start of a low lift cams be provided.

A Particularly light-weight variant is present when the inner body or open on both sides like a tube. Generally, it is intended at least one of the components (outer body, inner part) of a Lightweight material such as steel sheet to represent. Also is at this Place at extrusion presses thought.

A further dependent claim relates to a proper training the rotation in the opening of the approach. So this example, as a needle, roller, ball, Pen, spring clip, etc. may be formed. A guide of the anti-twist device can in case of use of the longitudinal groove in the outer jacket of the inner part over their side walls or reason. For the case of a longitudinal flattening on the outer jacket of the inner part then communicates a radially inner end of the Anti-rotation device with the flattening.

According to one further appropriate training the invention it is provided, the rotation "loose" in the opening of the To arrange approach. Thus unnecessary additional fastening measures and the material is not deformed in the surrounding area of the opening. It is However, also conceivable and provided, the rotation, for example in the opening Press or weld there. A fixation of the anti-twist device radially outward can over one on the outside take the approach running ring.

Short description of the drawing

The The invention is explained in more detail with reference to the drawing. Show it:

1a a longitudinal section through a tappet;

1b the bucket tappet as before, but rotated by 90 °;

2 - 7 as details variants of the anti-rotation in approach;

8th a partial cross section through the tappet at the level of rotation with flattening at the neck;

9 a partial cross section as mentioned above, but with longitudinal groove at the neck and

10 a partial longitudinal section through a tappet 1a , but with continuous longitudinal flattening.

Detailed description of the drawing

Shown in the 1a . 1b a switchable bucket tappet 1 , This consists of an outer body 2 with a ring-like bottom 3 , The latter is designed for a start of two Großhubnocken. From an outer edge 4 of the soil 3 is a thin-walled shirt in the direction of the cam 5 from. About the shirt 5 is the bucket tappet 1 feasible in a recording of the internal combustion engine.

From an inner edge 6 of the soil 3 protrudes a hollow cylindrical approach 7 in cam-distant direction. In a hole 8th of the approach 7 runs relatively axially movable to a tubular inner part 9 which over its bottom 10 offers a system for a gas exchange valve, not shown. In 1 is further indicated that the inner part 9 optionally by a floor 28 can be closed. The latter can serve as a start of a low or zero lift cam. In the case of the herewith, however, targeted tube-like design of the inner part 9 does not run against this cam. The tappet 1 is thus available as a so-called "Hubabschalter".

A crosspiece of the inner part 9 has a trained here as a radial bore recording 12 with two diametrically opposed coupling agents 11 , The coupling agent 11 are formed as pistons which, starting from their outer foreheads, are flattened at their tops in sections. The coupling agents 11 is at cam base circle run a driving surface 13 opposite (s. 1b ) in a hole 8th of the approach 7 applied and designed, for example, as a bag.

1b discloses the coupling state of the bucket tappet 1 so that the hub of the ground 3 of the outer body 2 acting on large lift cam package on the bottom 10 lying gas exchange valve is transmitted.

Furthermore, the person skilled in the art from the 1a . 1b take that at a lower area 15 an outer jacket 16 of the inner part 9 a thin-walled ring element 17 is attached. This serves a oneendigen plant one the inside part 9 comprehensive Lost motion spring, the other end indirectly against a bottom 19 of the soil 3 acts.

In the outer jacket 16 of the inner part 9 is a longitudinal groove / longitudinal flat 24 intended. In training after 1a this does not end on a far away forehead 26 of the inner part 9 but runs above the attachment of the ring element 17 on the inner part 9 out. In the annular groove / longitudinal flat 24 engages an anti-twist device 20 , This sits in an opening 21 of the approach 7 , The anti-twist device 20 can be "loose" or for example pressed into the opening 21 run. She suggests a variant with her outer forehead 42 on a ring 41 on, on an outside 40 of the approach 7 runs and at the bottom 19 of the soil 3 as well as on an inner coat of the shirt 5 has continued.

The aforementioned opening 21 in the beginning 7 is located radially outside an opening 22 in the shirt 5 in alignment. Thus, an easy way is created, the opening 21 display. It is engaged by tools through the opening 22 created. Conveniently, a punching or drilling tool is used, which openings 22 . 21 represents virtually in one operation, although several steps are conceivable.

An assembly of the anti-twist device 20 can depending on the design of the longitudinal groove / longitudinal flat 24 done differently. Runs the longitudinal groove / longitudinal flat 24 axially in front of the ring element 17 so that this experiences an excellent, all-round attachment, it is provided, the longitudinal groove / longitudinal flat 24 with a mounting breakthrough 25 to provide. This is axially lower than a deepest point of engagement of the rotation in the longitudinal groove / longitudinal flat 24 at differential stroke during operation. Thus, the outer body becomes 2 so far relative to the inner part 9 axially displaced down until the assembly breakthrough 25 to the opening 21 in the beginning 7 is in flight. Then the twisting fuse 20 from the inside through the mounting aperture 25 in the opening 21 in the beginning 7 be pushed.

In the event that the longitudinal groove / longitudinal flat 24 is made throughout, so to a floor distant forehead 26 of the inner part 9 extends (see 10 ), before installing the inner part 9 into the hole 8th of the approach 7 the rotation lock 20 in the opening 21 in the beginning 7 plugged. Subsequently, the inner part 9 axially from above over the inner edge 6 into the hole 8th of the approach 7 twisted-oriented introduced.

2 reveals that the anti-twist 20 with cam base circle run on an upper forehead 27 the longitudinal groove / longitudinal flat 24 can strike. Thus, this can be an aligned position of the recording 12 with the coupling agents 11 in the inner part 9 to the driving surfaces 13 in the beginning 7 being represented.

The 2 to 7 Variants of an embodiment of the anti-twist device are removable:
This can according to 2 as upright in the opening 21 of the approach 7 "Standing" needle / roller 30 be formed with its inside 23 in the longitudinal groove 24 of the approach 7 attacks.

To 3 is a "lying" built-in needle / roller 30 intended.

According to 4 is a "lying" massive role 34 arranged, the inner end of a radially enlarged engagement collar 36 Has. The latter lies with its axial inside in front of or at the bore 8th of the approach 7 at. The role stands out 34 in an opening 43 of the ring 41 ,

5 discloses a solution similar to 4 , The role 37 is however hollow as well as longitudinally slit.

To 6 can prevent rotation 20 also as a ball 31 be formed, the radially inward into the longitudinal groove 24 of the approach 7 engages in the anti-rotation sense.

According to 7 is the anti-twist device 20 as a pen 32 formed, which has a convex Inneneingriffsstirn 33 having.

The 8th . 9 show that, depending on the training of the rotation 20 , either a longitudinal flat 24 ( 8th ) or a longitudinal groove 24 ( 9 ) can be applied. In case of using a longitudinal groove 24 a guide can be made either on the groove base or on the flanking sides.

1

tappets

2

outer body

3

ground outer body

4

outer edge

5

shirt

6

inner edge

7

approach

8th

drilling approach

9

inner part

10

bottom

11

coupling means

12

admission

13

entraining

14

ring surface

15

lower Area

16

outer sheath

17

ring element

18

Lost-motion spring

19

bottom ground

20

twist

21

Opening in approach

22

Opening in shirt

23

inside

24

Longitudinal groove / Längsanflachung

25

Mounting breakthrough

26

ground-removed Forehead inner part

27

forehead longitudinal groove

28

ground inner part

29

Needle / Role

30

Needle / Role

31

Bullet

32

pen

33

Internal meshing forehead

34

role

35

interior forehead

36

engaging sleeve

37

role

38

interior forehead

39

engaging sleeve

40

outside

41

ring

42

outer end

43

opening

Claims (10)

Switchable bucket tappets ( 1 ) for a valve train of an internal combustion engine, with an outer body ( 2 ), which has a ring-like, designed for a Großhubnockin contact ( 3 ), from its outer edge ( 4 ) a hollow cylindrical shirt ( 5 ), wherein from an inner edge ( 6 ) of the soil ( 3 ) a hollow cylindrical approach ( 7 ), in whose bore ( 8th ) to the outer body ( 2 ) relatively axially movable inner part ( 9 ) is guided, whose underside ( 10 ) serves as a plant for a gas exchange valve, wherein in the tappet ( 1 ) Coupling agent ( 11 ) run to achieve a full valve lift at Nockengrundkreisdurchlauf optionally from a recording ( 12 ) one of the components ( 9 . 2 ) coming in sections with a driver surface ( 13 ) of the other component ( 2 . 9 ), an annular surface ( 14 ) bridging between them are engageable, wherein at a lower area ( 15 ) of an outer jacket ( 16 ) of the inner part ( 9 ) a ring element ( 17 ), on which one end a Lost-Motion-spring ( 18 ), the other ends at least indirectly against a bottom ( 19 ) of the soil ( 3 ) of the outer body ( 2 ) and where between the components ( 2 . 9 ) an anti-twist device ( 20 ) applied in an opening ( 21 ) of the approach ( 7 ) and with its inside ( 23 ) in / at a complementary longitudinal groove / longitudinal flat ( 24 ) of the outer jacket ( 16 ) of the inner part ( 9 ), characterized in that the opening ( 21 ) of the hollow cylindrical approach ( 7 ) window-like manner and by tool engagement via a further opening ( 22 ) in the radially opposite area of the shirt ( 5 ) is shown. Cup tappet according to claim 1, characterized in that the longitudinal groove / longitudinal flat ( 24 ) of the inner part ( 9 ) has a longitudinal extent, the bottom side at least emanates from an engagement of the rotation ( 20 ) in this at the cam base circle passage and in the ground-away direction before or on the ring element ( 17 ) on the outer jacket ( 16 ) of the inner part ( 9 ), wherein the longitudinal groove / longitudinal flat ( 24 ) of a mounting breakthrough ( 25 ) is cut axially lower than a deepest engagement position of the rotation ( 20 ) in the longitudinal groove / Längsanfachung ( 24 ) at difference lift [decoupling], over which mounting breakthrough ( 25 ) in the case of installation the anti-twist device ( 20 ), radially from the inside to the outside, into the opening ( 21 ) of the approach ( 7 ), at maximum difference position of the outer body ( 2 ) to the inner part ( 9 ), is mounted. Cup tappet according to claim 1, characterized in that the longitudinal groove / longitudinal flat ( 24 ) of the inner part ( 9 ) has a longitudinal extent, the bottom side at least emanates from an engagement of the rotation ( 20 ) in this at the cam base circle passage and over the entire axial extent of the inner part ( 9 ) to the floor of his forehead ( 26 ), wherein in the case of installation, the anti-rotation ( 20 ) radially from the inside, over the free bore ( 8th ) of the approach ( 7 ), outwards into the respective opening ( 21 ) and then the inner part ( 9 ) over the inner edge ( 6 ) of the soil ( 3 ) telescopically into the bore ( 8th ) of the approach ( 7 ) is plugged. Cup tappet according to claim 1, characterized in that over stop the rotation ( 20 ) with cam base circle pass on an upper end ( 27 ) of the longitudinal groove / longitudinal flat ( 24 ) of the inner part ( 9 ) an aligned and optionally coupled play position of the recording ( 12 ) with the coupling agent ( 11 ) in one component ( 9 . 2 ) to join user area ( 13 ) in the other component ( 2 . 9 ) is determined. Cup tappet according to claim 1, characterized in that the inner part ( 9 ) either with a floor ( 28 ) is provided for a start of a low or zero lift cam or that the inner part ( 9 ) no cam contact surface is immanent. Cup tappet according to claim 5, with the variant in which the inner part has no cam contact surface, characterized in that the inner part ( 9 ) is open at least on the bottom side or on both sides like a tube. Cup tappet according to claim 1, characterized in that the aligned openings ( 21 . 22 ) in the beginning ( 7 ) and shirt ( 5 ) are punched or drilled with a tool. Cup tappet according to claim 1, characterized in that as anti-rotation device ( 20 ) in the opening ( 21 ) of the approach ( 7 ) either a) an upright or horizontal cylindrical needle / roller ( 29 . 30 ); b) a ball ( 31 ); c) a lying pen ( 32 ) with a convex inner engagement frontal ( 33 ); d) a horizontal, massive roll ( 34 ) with an inner forehead ( 35 ) radially expanding and in the bore ( 8th ) of the approach ( 7 ) inside engaging collar ( 36 ) or e) a horizontal, hollow and longitudinally slotted roller ( 37 ) with an inner forehead ( 38 ) radially expanding and in the bore ( 8th ) of the approach ( 7 ) inside engaging collar ( 39 ) is provided. Cup tappet according to claim 1 or 8, characterized in that the window-like opening ( 21 ) in the beginning ( 7 ) to the outer jacket of the rotation ( 20 ) is complementary, wherein the anti-rotation ( 20 ) either "loose" or "solid" in the window-like opening ( 21 ) sits. Cup tappet according to claim 8, characterized in that on an outer side ( 40 ) of the approach ( 7 ) a ring ( 41 ) as a sheet metal ring is attached, the rotation ( 20 ) either with her outer forehead ( 42 ) on the ring ( 41 ) lies inside or in a complementary opening 7 Bag ( 43 ) of the ring ( 41 ) sitting in sections.