EP3901427B1 - Cover body for valve rotary device, corresponding valve rotary device and method for manufacturing the cover body - Google Patents

Description

field of invention

The present invention relates to a cover body for a valve rotating device for internal combustion engines, a corresponding valve rotating device and a method for producing the cover body.

State of the art

In order to prevent the valves of an internal combustion engine from being loaded unevenly in the circumferential direction, it is necessary for the valves to rotate continuously during operation. The rotation prevents one-sided wear and deposits on the valve seat. An equal temperature distribution in the circumferential direction is also achieved. If the "natural" rotation" of the valves is too small, forced turning devices are used, so-called valve turning devices.

Valve rotation devices produce valve rotation by forcing balls, which are located in pockets in a body and which abut a Belleville washer, to roll on inclined raceways formed in the pockets, thereby rotating the body and Belleville spring relative to one another about the valve axis. The plate spring is connected to a cover by means of friction, which at the same time supports the valve spring. The rotation can occur either on the valve opening stroke or on the valve closing stroke. Top designs, ie the valve rotating device is located on the side of the valve spring facing away from the combustion chamber, and bottom designs, ie the valve rotating device is located on the side of the valve spring facing the combustion chamber, are possible. In the overhead design, the body has a conical opening into which cones are inserted that hold the valve at the stem end. In the execution below is the Base body on the cylinder head and the rotation is transmitted to the valve via the valve spring.

Due to the punctiform contact of the balls with the disk spring, high rolling pressures occur, which lead to a high load on the disk spring. The high rolling load leads to wear of the disc spring, in particular to pitting (i.e. pitting or spot corrosion).

From the DE 10 2017 126 541 B3 a valve rotating device with a cover body is already known, which has a housing which is intended for receiving an axial spring element. The disadvantage of this is that the housing-shaped cover is complicated and can be produced in several steps, with the material expenditure being high and corresponding costs being incurred.

One object of the present invention is to provide an improved valve turning device with a cover body which can be produced simply and with a saving of material.

Summary of the Invention

According to a first aspect, the invention relates to a cover body for a valve rotating device, comprising an annular upper part and an annular lower part, the upper part and the lower part being spaced apart axially and being able to accommodate an axial spring element between them, the upper part and the lower part being connected to one another by at least one connecting piece are, wherein the at least one connecting piece is arranged on the opposite side of an insertion position of the axial spring element.

The advantage of the cover body according to the invention lies in the fact that it can be produced in a few work steps in a material-saving manner, thereby reducing the production costs.

It is preferred that the at least one connecting piece is radially outside of the imported axial spring element is arranged. The advantage of the arrangement is that the function of the inserted axial spring element is not impeded.

It is preferred that the at least one connecting piece is arranged laterally outside the edge on the base. The arrangement on the side outside the edge on the lower part saves material.

It is preferred that the at least one connecting piece is arranged laterally outside the edge on the upper part. The arrangement laterally outside the edge on the upper part saves material.

It is preferred that the at least one connecting piece is arranged within a space that is spanned by the cross sections of the upper part and the lower part. The advantage of arranging the at least one connecting piece within this spanned space is a more compact design.

It is preferred that the at least one connecting piece detachably connects the upper part and the lower part. A detachable connection of the upper part and the lower part ensures easy replacement of the axial spring element by disassembling the cover body.

It is preferred that the at least one connector has at least 2 connectors spaced apart from each other. This has the advantage that the load is distributed more evenly.

It is preferred that the at least one connector comprises at least 3 connectors spaced apart from each other. This has the advantage that the load is evenly distributed.

The upper part and the lower part are formed integrally or in one piece with the at least one connecting piece.

The advantage of an integral or one-piece design is that fewer work steps are required during production.

The lid body is made from sheet metal by stamping and bending.

It is preferred that the upper part has at least 2 axial projections for guiding at least one valve spring. This provides easy adjustment for valve spring guide variations.

It is preferred that the upper part has at least 1 recess for guiding at least one valve spring. The advantage of a recess for guiding at least one valve spring is further material savings.

It is preferable that the top and bottom are flat disc-shaped bodies made of metal. The advantage of flat disc-shaped bodies is that they can be punched without any problems. According to another aspect of the invention, there is provided a valve rotating device equipped with the cap body of the invention. It comprises an annular base body, which has a plurality of pockets oriented in a circumferential direction, in each of which a ball and a tangential spring are arranged, the pockets having a variable depth in the circumferential direction, so that inclined raceways are formed for the balls arranged therein, the Tangential springs press the balls in the direction of one end of the respective pocket, a cover body according to one of the preceding claims, wherein the axial spring element is annular and a first end of the axial spring element is supported on an annular stop surface of the base body and a second end of the axial spring element is supported on a surface of the The upper part is supported, with a surface of the lower part, which faces away from the axial spring element, abuts against the balls, and the balls and the axial spring element are arranged in an overlapping manner in the radial direction.

The advantage of the valve turning device according to the invention is that it can be produced easily and in a material-saving manner, and the production costs are reduced as a result.

According to a further aspect of the invention, a method for manufacturing a cover body for a valve rotating device is provided, comprising stamping a metal sheet which, after stamping, has two ring-shaped parts which are connected to one another by at least one connecting piece, the stamped metal sheet being formed into a cover body by bending is transferred.

The method according to the invention has the advantage that few work steps have to be carried out to produce a cover body.

It is preferred that the stamped metal sheet has at least 2 spaced apart connectors. At least 2 spaced connectors have the advantage that the load is more evenly distributed.

It is preferred that the stamped metal sheet has at least 3 spaced connectors. At least 3 spaced connectors have the advantage that the load is evenly distributed.

It is preferred that the stamped metal sheet has at least 2 protrusions for guiding at least one valve spring, which are bent into a position which is essentially 90° to the upper part. This provides easy adjustment for valve spring guide variations.

It is preferred that the stamped sheet metal has at least 1 recess for guiding at least one valve spring. The advantage of a recess for guiding at least one valve spring is further material savings.

Brief description of the drawings

• Fig. 1 einen Deckelkörper gemäß einer Ausführungsform der Erfindung zeigt,
• Fig. 2 einen weiteren Deckelkörper gemäß einer anderen Ausführungsform zeigt,
• Fig. 3 noch einen weiteren Deckelkörper gemäß noch einer anderen Ausführungsform zeigt,
• Fig. 4 einen axialen Schnitt einer Ventildrehvorrichtung gemäß der Erfindung zeigt,
• Fig. 5 einen Schnitt in Umfangrichtung einer Tasche zeigt, und
• Fig. 6 ein Metallblech mit Stanzkontur zeigt.

Exemplary embodiments of the invention are described in more detail below with reference to the figures, in which

• 1 shows a lid body according to an embodiment of the invention,
• 2 shows another lid body according to another embodiment,
• 3 shows yet another lid body according to yet another embodiment,
• 4 shows an axial section of a valve turning device according to the invention,
• figure 5 Figure 12 shows a circumferential section of a pocket, and
• 6 shows a metal sheet with a punched contour.

Detailed Description of the Invention

1 12 shows a lid body 2 according to an embodiment of the invention. The lid body 2 comprises an annular disk-shaped upper part 4, an annular disk-shaped lower part 6, as well as connecting pieces 8 and 8' and 4 projections 10.

The upper part 4 and the lower part 6 are spaced apart axially and are connected to one another by the bead-like connecting piece 8 . The connecting piece 8' and another connecting piece 8' (not visible) have an L-shape, are arranged laterally on the lower part 6 and are aligned in the direction of the upper part 4 by bending and are connected thereto.

The connecting pieces 8 and 8' are arranged in such a way that an axial spring element can be passed between them, the connecting pieces 8 and 8' being welded, screwed or riveted to the counterpart as required.

Projections 10 are shown on the upper part 4, which are punched out, cut or sawn. These are aligned by bending axially outwards at 90° and guide the valve spring. Alternatively, a recess (not shown) on the upper part 4 can guide the valve spring.

2 shows a further lid body 2' according to another embodiment, in which the upper part 4' is connected to the lower part 6' by a plurality of spaced-apart connecting pieces 8". The connecting pieces 8" are only on one Ring half arranged to ensure the accommodation of an axial spring element 24 on a side opposite to the connecting pieces 8 ", extend in an edge area of the space between upper part 4 'and lower part 6' and are welded or screwed to the counterpart when or as required or riveted.

Projections 10` are shown on the upper part 4', which are punched out, cut or sawn. These are aligned axially by bending and guide the valve spring. Alternatively, a recess (not shown) on the upper part 4` can guide the valve spring.

3 shows yet another lid body 2" according to yet another embodiment, in which the connection between the upper part 4" and the lower part 6" is in the form of a plurality of spaced-apart connecting pieces 8‴ which are arranged laterally on the upper part 4" and bent in the direction of the lower part 6" are aligned. The connecting pieces 8‴ are welded, screwed or riveted to the counterpart at or as required.

Projections 10" are shown on the upper part 4" which are punched out, cut or sawn. These are aligned axially by bending and guide the valve spring. Alternatively, a recess (not shown) on the upper part 4' can guide the valve spring.

4 shows a valve rotating device according to the invention in an axial section, ie an axis of the valve rotating device lies in the plane of the section. The valve rotation device comprises an annular base body 22, an annular cover body 2 and an annular axial spring element 24. Base body 22 and cover body 2 can be rotated relative to one another about the axis of the valve rotation device (i.e. in the circumferential direction) and can be displaced relative to one another in the axial direction. An overhead version is shown. Correspondingly, the base body 22 is provided with a conical opening into which cones suitable for holding a valve can be inserted. A design below is also possible. A conical opening is then not necessary, but only an opening through which the stem of a valve can run.

Several pockets 16 (or indentations) are worked into the base body 22 in the circumferential direction, which are oriented in the circumferential direction and each extend over a specific angular range in the circumferential direction (perpendicular to the plane of the drawing). A depth of the pockets 16 (ie the extent of the pockets in the axial direction) is variable in the circumferential direction, so that an inclined track 26 is formed in each of the pockets 16, cf. figure 5 . In each of the pockets 16 are a ball 14 and a tangential spring 32, cf. figure 5 , Arranged, wherein the ball can roll on the inclined track 26. A diameter of the balls 14 should be larger than a smallest depth of the pockets 16. All balls 14 preferably have the same diameter and all pockets 16 have the same dimensions. The tangential springs 32 urge the balls 14 circumferentially against a respective end of the pockets 16, namely towards the end at which the corresponding pocket 16 has its smallest depth.

The base body 22 also has a stop surface 18 on which a first end of the axial spring element 24 is supported, with the stop surface 18 preferably being located radially (i.e. in a direction perpendicular to the axis) further inwards than the pockets 16. On the stop surface 18 there is a Storage 20 arranged, which allows a low-friction rotation of the base body 22 and axial spring element 24 about the axis, relative to each other.

The axial spring element 24 is arranged in the axial direction between the upper part 4 and the lower part 6 , with a second end of the axial spring element 24 being supported on a surface of the upper part 4 . In the radial direction, the axial spring element 24 is arranged further inward than the connecting piece 8. The axial spring element 24 causes a spring force in the axial direction, which possibly pushes the base body 22 and cover body 2 apart, since the first end of the axial spring element 24 presses against the stop surface 18 of the base body 22 supports. The axial spring element 24 and the balls 14 are arranged in an overlapping manner in the radial direction. The axial spring element 24 and the balls 14 are arranged next to one another in the axial direction, with the lower part 6 being located between the axial spring element 24 and the balls 14 . Overall, the sequence in the axial direction is preferred: upper part 4, axial spring element 24, lower part 6, balls 14, or to put it another way these four parts overlap in the radial direction. A disk spring is preferably used as the axial spring element 24 .

A surface of the lower part 6 facing away from the axial spring element 24 bears against the balls 14 which are arranged in the pockets 16 of the base body 22 . If the base body 22 and cover body 2 are pressed together against the force of the axial spring element 24, e.g. during the opening stroke of the valve, an axial force is exerted on the balls 14, which then roll on the one hand on the inclined raceways 26 in the pockets 16 and on the other hand on the axial spring element surface facing away from the lower part 6 roll. Characterized base body 22 and cover body 2 are rotated relative to each other about the axis. When the valve rotating device is relieved, e.g. during the closing stroke of the valve, the axial spring element 24 presses the base body 22 and the cover body 2 apart again, the force acting on the balls 14 becoming smaller and the balls therefore not rolling off when they are reset by the tangential springs 32 become.

In contrast to known valve turning devices, the rolling of the balls 14 does not take place on the plate spring 24, but on the lower part 6. This avoids a high rolling pressure on the plate spring 24 and associated wear. The lower part 6, in turn, can be designed more easily in accordance with the rolling loads that occur, since it does not have to assume a spring function at the same time. Likewise, the selection of the axial spring element 24, in particular a plate spring 24, is not restricted by the rolling loads, so a freer design of the axial spring element 24 is made possible. This also enables a compact, space-saving design of the valve rotating device. Since the disk spring 24 is fully inserted into the cover body 2, the complete lifting movement of the disk spring 24 is converted into a rotary movement via the inclination of the pockets 16. Compared to previous designs, the rotational movement per stroke can be increased by around 1.5 to 2 times. Alternatively, a stiffer disc spring 24 with an increased service life can be used with the same rotation.

The surface of the lower part 6 facing away from the axial spring element 24 can have a ball raceway, which reduces the rolling pressure on the lower part 6, for example.

The surface of the upper part 4 facing away from the axial spring element 24 is preferably set up to serve as a support surface for a valve spring.

figure 5 FIG. 14 is a partial circumferential sectional view showing a pocket 16 having a slanted track 26. FIG. A ball 14 and a tangential spring 32 are arranged in the pocket 16, which presses the ball 14 against the end of the pocket 16 at which the pocket 16 has its smallest depth. A section of the lower part 6 that rests against the ball 14 can also be seen. Under axial load, base body 22, cf. 4 , and lower part 6 are moved towards one another, so that the ball 14 rolls both on the inclined track 26 and on the surface of the lower part 6 and thus rotates the base body 22 relative to the cover body 2 about the axis.

6 shows a metal sheet 28 with a punched contour 30. The punched contour 30 has two ring-shaped parts, the upper part 4 and the lower part 6, which are connected by the connecting piece 8 and the upper part 4 has a larger outer diameter than the lower part 6 .

Further, the upper part 4 has projections 10 directed inwards and bent axially for guiding a valve spring, and further the lower part 6 has connecting pieces 8' directed outwards and bent axially for connection with the upper part 4 are provided.

Reference List

2

cover body

4

ring top

6

ring-shaped base

8th

connector

10

head Start

12

valve turning device

14

Bullet

16

Bag

18

annular stop surface

20

storage

22

annular body

24

axial spring element

26

sloping careers

28

metal sheet

30

stamped sheet metal

32

tangential spring

Claims (15)

1. A cover body (2) for a valve rotating device, comprising

   a ring-shaped upper part (4) and

   a ring-shaped lower part (6),

   wherein the upper part (4) and the lower part (6) are axially spaced apart and are adapted to accommodate an axial spring element (24) therebetween,

   wherein the upper part (4) and the lower part (6) are connected to each other by at least one connecting piece (8), wherein the at least one connecting piece (8) is arranged at the location opposite to an insertion position of the axial spring element (24),

   characterized in that the ring-shaped upper part and the ring-shaped lower part (4, 6) are formed by punching from a metal sheet and are integrally connected to one another by the at least one connecting piece (8), wherein the punched metal sheet (30) is transformed by bending into the cover body (2).
2. The cover body (2) according to claim 1, further comprising an inserted axial spring element (24), wherein the at least one connecting piece (8) is arranged radially outside the inserted axial spring element (24).
3. The cover body (2) according to any one of the preceding claims, wherein the at least one connecting piece (8) is arranged laterally outside the edge on the lower part (6).
4. The cover body (2) according to any one of the preceding claims, wherein the at least one connecting piece (8) is arranged laterally outside the edge on the upper part (4).
5. The cover body (2) according to any one of claims 1-2, wherein the at least one connecting piece (8) is arranged within a space spanned by the cross-sections of the upper part (4) and the lower part (6).
6. The cover body (2) according to any one of the preceding claims, wherein the at least one connecting piece (8) has at least 2 connecting pieces (8, 8') that are spaced apart from each other.
7. The cover body (2) according to any one of claims 1-5, wherein the at least one connecting piece (8) comprises at least 3 connecting pieces (8, 8', 8') that are spaced apart from each other.
8. The cover body (2) according to any one of the preceding claims, wherein the upper part (4) has at least 2 axial projections (10) for guiding at least one valve spring.
9. The cover body (2) according to any one of the preceding claims, wherein the upper part (4) has at least 1 recess for guiding at least one valve spring.
10. A valve rotating device (12) for internal combustion engines, comprising

    a ring-shaped base body (22) having a plurality of pockets (16) oriented in a circumferential direction, each pocket (16) having a ball (14) and a tangential spring (32) arranged therein, wherein the pockets (16) have a variable depth in the circumferential direction such that inclined raceways (26) for the balls (14) arranged therein are formed, wherein the tangential springs (32) push the balls (14) towards an end of the respective pocket (16),

    a cover body (2) according to any one of the preceding claims,

    wherein the axial spring element (24) is ring-shaped and a first end of the axial spring element (24) is supported on a ring-shaped stop surface (18) of the base body (22) and a second end of the axial spring element (24) is supported on a surface of the upper part (4),

    wherein a surface of the lower part (6) which faces away from the axial spring element (24) rests against the balls (14), and wherein the balls (14) and the axial spring element (24) are arranged overlapping in a radial direction.
11. A method for producing a cover body (2) for a valve rotating device, comprising punching a metal sheet (28) which, after punching, has two ring-shaped parts (4, 6) which are connected to one another by at least one connecting piece (8), wherein the punched metal sheet (30) is transformed by bending into a cover body (2) according to any one of claims 1-9.
12. The method according to claim 11, wherein the punched metal sheet (30) has at least 2 connecting pieces (8, 8') that are spaced apart from each other.
13. The method according to any one of claims 11 or 12, wherein the punched metal sheet (30) comprises at least 3 connecting pieces (8, 8', 8') that are spaced apart from each other.
14. The method according to any one of claims 11-13, wherein the punched metal sheet (30) has at least 2 projections (10) for guiding at least one valve spring which, by bending, are brought into a position aligned substantially at 90 ° relative to the upper part.
15. The method according to any one of claims 11-14, wherein the punched metal sheet (30) has at least 1 recess for guiding at least one valve spring.

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