CN107956529B

CN107956529B - Intermediate lever of variable valve gear

Info

Publication number: CN107956529B
Application number: CN201710963461.2A
Authority: CN
Inventors: 沃尔夫冈·克里斯特根; 迈克尔·克雷斯; 迈克尔·库格勒; 卡特娅·赫夫勒
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Holding China Co Ltd
Priority date: 2016-10-18
Filing date: 2017-10-16
Publication date: 2021-08-24
Anticipated expiration: 2037-10-16
Also published as: CN107956529A; DE102016220394B3

Abstract

The invention relates to an intermediate lever of a variable valve drive, which is produced in a plate-like manner and has at least one bearing surface for supporting a spring leg of a return spring, and which has two side walls which are parallel to one another at least in sections, wherein the two side walls are connected to one another via a ramp body having an outer ramp surface, wherein a tappet roller is arranged between the two side walls in a rotatably mounted manner, and wherein an adjusting and/or supporting roller is arranged on a free end of the side walls in a rotatably mounted manner. In order to improve the material distribution in the sheet metal part of the intermediate lever, it is proposed that the two side walls are each provided on their outer edge facing the free end of the spring leg with projecting webs, which webs are formed axially opposite one another on the longitudinal side between the tappet roller and the ramp body and each have outer faces which form separate or common bearing faces for supporting the end sections of the spring leg.

Description

Intermediate lever of variable valve gear

Technical Field

The invention relates to an intermediate lever of a variable valve drive, which is produced in a plate-like manner and has at least one bearing surface for supporting a spring leg of a return spring, and which has two side walls which are at least partially parallel to one another, wherein the two side walls are connected to one another via a ramp body having an outer ramp surface, wherein a tappet roller is arranged between the two side walls in a rotatably mounted manner, and wherein an adjusting and/or supporting roller is arranged on a free end of the side walls in a rotatably mounted manner.

Background

A variable valve gear of a reciprocating internal combustion engine known under the name valvetonic (electronic valve) by BMW AG (BMW AG) has: an eccentric shaft rotatable by means of a motor, said eccentric shaft having a cam disc; a camshaft in driving connection with a crankshaft of the internal combustion engine via a chain or gear belt drive, the camshaft having at least one cam per gas exchange valve; an intermediate lever of the aforementioned type of construction for each gas exchange valve; and a lift transmission element of each gas exchange valve. Such a variable valve gear is described, for example, in DE 10123186 a 1.

The lift profile of the associated cam of the camshaft is captured via the tappet roller of the intermediate lever and is transmitted via the ramp surfaces of the ramp bodies to the lift transmission element and via said lift transmission element to the valve stem of the associated gas exchange valve. The lift transmission element is preferably a roller rocker, wherein a rotatably mounted pick-off roller (abgriffrole) comes into contact with a ramp surface of the ramp body. Alternatively, the lift transmission element can however also be a rocker arm provided with a rotatable pick-up roller or a corresponding tappet. Via the rotation of the eccentric shaft, the intermediate lever is pivoted about the contact axis between the cam of the camshaft and the tappet roller by the adjusting contact of the adjusting roller with the cam disc. The intermediate lever is guided on the end side via support rollers on a circular-arc-shaped guide track of a guide runner fixed to the housing.

As an alternative to the cylindrical thrust surface that is transmitted to the adjusting and/or supporting roller, the adjusting stroke of the cam disk can also be transmitted to the intermediate lever on a circular arc-shaped sliding surface section that is formed at the free end of the side wall on the end side.

By pivoting the intermediate lever, the contact area of the ramp surface with the catch roller of the lift transmission element is moved, whereby a change in the valve lift of the associated gas exchange valve is obtained as a result of the height and inclination of the ramp surface. The permanent contact of the tappet roller of the intermediate lever with the associated cam of the camshaft is ensured via a return spring, preferably designed as a leg spring, the spring leg of which rests on the bearing surface of the intermediate lever.

DE 10260557 a1 discloses an intermediate lever of a variable valve gear, which is manufactured from sheet steel in a plate-like manner, i.e., mainly by punching, bending and pressing, wherein an adjusting and supporting roller, which is mounted so as to be rotatable on the end side between the side walls, serves to guide an adjusting stroke into the intermediate lever of a cam disk and to guide the intermediate lever in a guide track. The bearing surface for supporting the spring leg of the restoring spring is located in the intermediate lever at the end of the ramp body on the end side, wherein the two bent outer webs serve to laterally guide the spring leg.

DE 102011003898 a1 describes another intermediate lever of a variable valve drive, which is produced in a plate-like manner, in which the free ends of the side walls are tightened and abut against one another. During the use of the supporting rollers, which are designed as double rollers with two outer disks, for guiding the intermediate lever in the aforementioned guide link, the adjusting stroke of the cam disk is transmitted to the intermediate lever on a circular arc-shaped sliding surface section, which is formed at the end on the free ends of the two side walls. According to a configuration of the intermediate lever, the radius of the support roller can be smaller or larger than the radius of the sliding surface section. The bearing surface for supporting the spring leg of the restoring spring is located in the intermediate lever in a recess centrally arranged on the end face of the ramp body, wherein the two remaining outer webs serve for laterally guiding the spring leg.

Finally, DE 102012222374 a1 discloses an intermediate lever of a variable valve gear, which is produced in a plate-like manner, wherein an adjusting and supporting roller, which is mounted rotatably on the end side between the side walls, serves to guide the adjusting stroke of the cam disk into the intermediate lever and to guide the intermediate lever in a guide link. An annular cylindrical thrust surface for introducing the adjusting lift of the cam disk is arranged centrally in the adjusting and supporting roller and has a smaller radius than the thrust surface for guiding the intermediate lever in the guide runner. The bearing surface for supporting the spring leg of the restoring spring is located in the intermediate lever on a bent attachment piece, which is arranged centrally on the end face of the ramp body. In order to guide the spring leg laterally, the U-shaped component is inserted into the ramp body below the attachment piece by means of a laterally projecting web.

In the intermediate lever described above, which is produced in a plate-type manner, there is, in principle, the problem of a material deficiency in the region of the ramp body, as a result of which it is difficult to form a sufficiently large ramp surface and at the same time the bearing surface for the spring leg supporting the return spring and the webs for laterally guiding the spring leg on the ramp body during the shaping of the sheet metal part. Furthermore, in the known embodiments of the bearing surfaces for supporting the spring legs, there is the following risk: the ends of the spring legs move away from the ramp face of the ramp body as the return spring compresses, thereby limiting the usable area of the ramp face.

Disclosure of Invention

The invention is therefore based on the object of proposing, in an intermediate lever of the initially mentioned type of construction, which is produced in a plate-like manner, an alternative design and arrangement for the spring leg supporting the return spring, by means of which a more advantageous material distribution in the plate blank and a larger usable area of the ramp surface of the ramp body is obtained.

In an intermediate lever of a variable valve gear, which is produced in a plate-like manner and has at least one bearing surface for supporting a spring leg of a return spring, and which has two side walls which are at least partially parallel to one another, wherein the two side walls are connected to one another via a ramp body having an outer ramp surface, wherein a tappet roller is arranged between the two side walls in a rotatably mounted manner, and wherein adjusting and/or supporting rollers are rotatably mounted on the free ends of the side walls, this object is achieved in that the two side walls are provided, on their outer edges facing the free ends of the spring legs, with projecting webs which are formed longitudinally opposite one another between the tappet roller and the ramp body, and the webs each have an outer surface which forms a separate bearing surface or a common bearing surface for supporting the end sections of the spring legs.

Advantageous embodiments and further developments of the intermediate lever according to the invention are described below.

The invention is therefore based on an intermediate lever, known per se, for a variable valve drive of a reciprocating internal combustion engine, which is produced in a plate-like manner, which is provided with at least one bearing surface for supporting a spring leg of a return spring, and which has two side walls which are parallel to one another at least in sections. The side walls are fixedly connected to one another via a ramp body having an outer ramp surface, on which a variable-position lift movement can be transmitted by pivoting the intermediate lever to a lift transmission element, for example a roller rocker, and from there on to the valve stem of the associated gas exchange valve. A tappet roller is rotatably mounted between the two side walls, via which tappet roller a lift profile of an associated cam of the camshaft is recorded. At the free ends of the two side walls, adjusting and/or supporting rollers are rotatably mounted, via which adjusting lifts for pivoting the intermediate lever are guided into the adjusting and/or supporting rollers and/or the intermediate lever is guided in a slotted-link path.

In order to achieve a more advantageous material distribution for the shaping of the sheet metal blank and to avoid a limited usable area for the ramp surface, the two side walls of the intermediate lever designed according to the invention are each provided with a projecting web on its outer edge facing the free end of the spring leg. The webs are arranged axially opposite one another longitudinally between the tappet roller and the ramp body and each have an outer surface which forms a separate bearing surface or a common bearing surface for supporting the end sections of the spring legs.

By displacing the bearing surface or the bearing surface for supporting the return spring away from the ramp body toward the spaced-apart webs, more material is provided for the forming of the ramp body in the sheet metal part during the production of the intermediate lever. Furthermore, the ends of the spring legs can no longer leave the ramp surface of the ramp body due to the increased distance when the restoring spring is compressed, so that the usable area of the ramp surface is thus no longer limited.

According to a first embodiment of the intermediate lever, it is provided that the web projects flat from the outer edge of the side wall, and the outer end face of the web forms a separate, preferably flat bearing surface for supporting an end section of the spring leg, which is preferably bent at right angles to the side wall.

In a second and third embodiment of the intermediate lever according to the invention, it is provided that the web is T-shaped, and the outer end face of the web forms a separate, preferably flat bearing face for supporting an end section of the spring leg, which is preferably bent at right angles to the side wall.

The T-shaped configuration of the connecting piece can be made by pressing. However, it is also possible for the T-shaped configuration of the webs to be produced by folding in and out or folding in and out with a length ratio of 1: 2.

According to a fourth embodiment of the intermediate lever according to the invention, it is provided that the web is bent outward, preferably at right angles, and the outer side of the web forms a separate, preferably flat bearing surface for supporting the end section of the spring leg, which is preferably bent at right angles to the side wall.

In a further embodiment of the intermediate lever according to the invention, the webs are each bent inward at as right an angle as possible, and the outer sides of the webs form at least one flat or curved bearing surface for supporting the end sections of the spring legs.

In a fifth embodiment of the intermediate lever, it is provided that the end faces of the webs are arranged at a distance from one another, and that the outer side faces of the webs are preferably formed flat, and that separate bearing surfaces are formed for supporting the end sections of the spring legs, which are preferably bent at right angles to the side walls.

In a sixth embodiment of the intermediate lever according to the invention, it is provided that the end faces of the webs abut each other in the middle, and that the outer sides of the webs are preferably formed flat and form a common bearing surface for supporting the end sections of the spring legs, which are preferably bent at right angles to the side walls.

In a seventh embodiment of the intermediate lever according to the invention, it is provided that the end faces of the webs abut each other in the middle, and that the outer side faces of the webs are preferably of flat design, and that end faces are provided on the outer edges, which end faces each have a step forming a V-shaped recess.

In this variant of the web, the outer side of the web can form a separate, preferably flat bearing surface for supporting the end section of the spring leg, which is preferably bent at right angles to the side wall. The V-shaped recess serves to accommodate, for example, weld metal in the case of a material-fit connection of the connecting webs.

Alternatively, however, it is also possible for the V-shaped recess to form an end section of the spring leg that is bent parallel to the side wall for supporting and laterally guiding the spring leg. In both embodiments and support types of the spring leg, the contact of the end section of the spring leg with any burrs that may be present in the contact region of the end face of the connecting piece is excluded.

In an eighth embodiment of the intermediate lever according to the invention, it is provided that the end faces of the webs abut each other in the middle, and that the outer flanks of the webs are convexly curved and are each provided at the end with a step forming a flat recess.

In this variant of the web, the outer side of the web can form a separate, arched bearing surface which supports the end section of the spring leg, which is preferably bent at right angles to the side wall. In this embodiment and the type of support of the spring leg, the contact of the end section of the spring leg with any burrs that may be present in the contact region of the end face of the connecting web is excluded.

Alternatively, however, it is also possible for the bottom wall of the flat recess to form a bearing surface for supporting the end section of the spring leg bent parallel to the side wall. The step of the web then also leads to the end section of the lateral guide spring leg. In this embodiment and the support type of the spring leg, a mechanical reworking of the flat recess is of course necessary in order to avoid contact of the end section of the spring leg with any burrs that may be present in the contact region of the end face.

In a ninth embodiment of the intermediate lever according to the invention, it is provided that the end faces of the webs abut each other in the middle and that the webs are convexly curved inward, so that the outer side faces of the webs form a V-shaped recess in the middle.

In this variant of the web, the outer side of the web can form a separate, curved bearing surface for supporting the end section of the spring leg bent at right angles to the side wall. Alternatively, however, it is also possible for the V-shaped recess to form a receptacle for supporting and laterally guiding the end section of the spring leg bent parallel to the side wall. In both embodiments and support types of the spring leg, the contact of the end section of the spring leg with any burrs that may be present in the contact region of the end face of the connecting piece is excluded.

In a tenth embodiment of the intermediate lever according to the invention, it is provided that the end faces of the webs abut each other in the middle and that the webs are convexly curved inward, so that the outer sides of the webs form a common, convex bearing surface for supporting the end sections of the spring legs bent at right angles to the side walls.

It should be noted here that the actual bearing surface of the web, viewed in the longitudinal direction of the respective intermediate lever in all the illustrated embodiments, can be not only flat, i.e., planar, but can alternatively also be concave, convex, spherical or have any other free geometry that follows a functional curve. The same applies to the variation of the contact surface of the web transversely to the longitudinal extent of the respective intermediate lever, if appropriate in other embodiments.

Furthermore, according to another embodiment, it can be provided that the end section of the spring leg of the restoring spring bears against at least one of the two side walls of the intermediate lever and is supported there.

In those embodiments of the intermediate lever in which the web is formed bent, the bending can be not only at right angles, but also at other angles greater than 0 ° and less than 180 °.

In the embodiment of the intermediate lever with end faces of the connecting webs abutting against one another, the connecting webs are connected to one another, for example, in a material-fit manner at the end faces, for example, by welding or soldering, whereby the intermediate lever is additionally reinforced. However, it is also possible to connect the two webs to one another in a form-fitting manner.

Drawings

For the purpose of illustrating the invention, there is attached to the specification the accompanying drawings which form a part hereof. In which are shown:

figure 1 shows a perspective view of a first embodiment of an intermediate lever according to the invention,

figure 1a shows a perspective view of the intermediate lever according to figure 1 with a spring leg of the return spring,

figure 2 shows a perspective view of a second embodiment of the intermediate lever according to the invention,

figure 2a shows a perspective view of the intermediate lever according to figure 2 with a spring leg of the return spring,

figure 3 shows a perspective view of a third embodiment of the intermediate lever according to the invention,

figure 3a shows a perspective view of the intermediate lever according to figure 3 with a spring leg of the return spring,

figure 4 shows a perspective view of a fourth embodiment of the intermediate lever according to the invention,

figure 4a shows a perspective view of the intermediate lever according to figure 4 with a spring leg of the return spring,

figure 5 shows a perspective view of a fifth embodiment of the intermediate lever according to the invention,

figure 5a shows a perspective view of the intermediate lever according to figure 5 with a spring leg of the return spring,

figure 6 shows a perspective view of a sixth embodiment of the intermediate lever according to the invention,

figure 6a shows a perspective view of the intermediate lever according to figure 6 with a spring leg of the return spring,

figure 7 shows a perspective view of a seventh embodiment of the intermediate lever according to the invention,

figure 7a shows a partial perspective view of the intermediate lever according to figure 7 with a first embodiment of the spring leg of the return spring,

figure 7b shows a partial perspective view of the intermediate lever according to figure 7 with a second embodiment of the spring leg of the return spring,

figure 8 shows a perspective view of an eighth embodiment of the intermediate lever according to the invention,

figure 8a shows a perspective view of the intermediate lever according to figure 8 with a first embodiment of the spring leg of the return spring,

figure 8b shows a perspective view of the intermediate lever according to figure 8 with a second embodiment of the spring leg of the return spring,

figure 9 shows a perspective view of a ninth embodiment of the intermediate lever according to the invention,

figure 9a shows a perspective view of the intermediate lever according to figure 9 with a first embodiment of the spring leg of the return spring,

figure 9b shows a perspective view of the intermediate lever according to figure 9 with a second embodiment of the spring leg of the return spring,

figure 10 shows a perspective view of a tenth embodiment of the intermediate lever according to the invention,

fig. 10a shows a perspective view of the intermediate lever according to fig. 10 with a spring leg of the return spring.

Detailed Description

Fig. 1 and 1a therefore show different perspective views of a first embodiment of an intermediate lever 1.1 with the features according to the invention for a variable valve drive of a reciprocating internal combustion engine.

The intermediate lever 1.1 is produced in a plate-like manner and has two at least partially mutually

parallel side walls

2, 3, which are connected to one another via a ramp body 4 having an outer ramp surface 5. Between the two

side walls

2, 3, a tappet roller 6 is mounted rotatably with a cylindrical annular thrust surface 7 on a pin 8, which is pressed into associated bores in the two

side walls

2, 3. At the free ends of the two

side walls

2, 3, the adjusting and/or supporting rollers 9 are mounted so as to be rotatable with two axially outer annular cylindrical thrust surfaces 10 and an intermediate annular cylindrical thrust surface 11 on a pin 12, which is pressed into associated bores of the two

side walls

2, 3. The outer thrust surface 10 of the adjusting and/or supporting roller 9 is now smaller in diameter than the intermediate thrust surface 11.

In the installed state, the contact surface 7 of the tappet roller 6 comes into contact with the associated cam of the camshaft, as a result of which a change in the lift profile of the cam is introduced as a deflection into the intermediate lever 1.1. The deflection of the intermediate lever 1.1 is transmitted via the ramp surface 5 of the ramp body 4 to the lift transmission element and via said lift transmission element further to the valve stem of the associated gas exchange valve. The lift transmission element is preferably a roller rocker, wherein a rotatably mounted pick-off roller is in contact with a ramp surface 5 of the ramp body 4. In order to vary the lift and the lift height of the gas exchange valve, the intermediate lever 1.1 can be pivoted in a limited manner about the contact axis between the cam and the tappet roller 6 by guiding the adjusting and/or supporting roller 9 via an axially outer thrust surface 10 in a housing-fixed, circular-arc-shaped guide slot. The adjustment lift required for pivoting the intermediate lever 1.1 is introduced via a cam disk that can be rotated to a limited extent into an intermediate thrust surface 11 of the adjustment and/or guide roller 9. The pick-off element of the lift transmission element or the pick-off roller of the roller rocker arm is in contact with another region of the ramp surface 5 of the ramp body 4 by pivoting the intermediate lever 1.1, by which means the lift change and the lift height of the associated gas exchange valve are changed.

In order to bring about permanent contact of the tappet roller 6 with the associated cam of the camshaft, a return spring 13 is provided, which is designed as a leg spring, the spring leg 14 of which is supported on at least one contact surface 23, 24 of the intermediate lever 1.1. Fig. 1a shows the spring leg 14 of the restoring spring 13.

In order to achieve a more advantageous material distribution for the shaping of the sheet metal blank, in contrast to known intermediate levers, the bearing surfaces 23, 24 for supporting the respective spring leg 14 are now arranged or formed on the intermediate lever 1.1 at a distance from the ramp body 4. For this purpose, the two

side walls

2, 3 of the intermediate lever 1.1 are each provided on their

outer edges

17, 18 facing the free end of the spring leg 14 with projecting

webs

19, 20 which are arranged axially opposite one another and longitudinally between the tappet roller 6 and the ramp body 4. The outer faces 21, 22 thereof form separate bearing faces 23, 24 for supporting the end section 15 of the spring leg 14.

In the exemplary embodiment shown in fig. 1 and 1a, the

webs

19, 20 project flat from the

outer edges

17, 18 of the two

side walls

2, 3, and the outer end faces 21, 22 of the

webs

19, 20 form separate, planar bearing faces 23, 24 for supporting the end sections 15 of the spring legs 14, which are bent at right angles to the

side walls

2, 3 in this embodiment. In the described design and arrangement of the bearing surfaces 23, 24 and the end portion 15 of the spring leg 14, it can be excluded that the end of the spring leg 14 can be moved away from the ramp surface 5 of the ramp body 4 when the return spring 13 is compressed, as in the case of the known intermediate lever, thereby limiting the usable area of the ramp surface 5.

The second embodiment of the intermediate lever 1.2 according to the invention of the variable valve gear, which is depicted in different perspective views in fig. 2 and 2a, differs from the first embodiment of the intermediate lever 1.1 according to fig. 1 and 1a in that the

webs

25, 26 are now T-shaped, wherein the T-shaped configuration of the

webs

25, 26 is produced by pressing. The outer end faces 27, 28 of the

webs

25, 26, which are larger than this, form separate bearing faces 29, 30 for supporting the end sections 15 of the spring legs 14 of the restoring spring 13, which are likewise bent at right angles to the

side walls

2, 3.

The third embodiment of the intermediate lever 1.3 according to the invention of the variable valve gear, which is depicted in different perspective views in fig. 3 and 3a, likewise has T-shaped

webs

31, 32, the T-shaped configuration of the

webs

31, 32, however, now being produced by folding in and out with a length ratio of 1: 2. The correspondingly large outer end faces 33, 34 of the

webs

31, 32 in turn form separate, flat bearing faces 35, 36 which support the end sections 15 of the spring legs 14 of the restoring spring 13 bent at right angles to the

side walls

2, 3.

The fourth embodiment of the intermediate lever 1.4 according to the invention of the variable valve gear, which is depicted in different perspective views in fig. 4 and 4a, differs from the previously described embodiments of the intermediate levers 1.1, 1.2, 1.3 according to fig. 1 to 3a in that the

webs

37, 38 are now formed bent at right angles outward. The outer side surfaces 39, 40 of the

webs

37, 38 are formed flat and in this embodiment also form separate, planar bearing surfaces 41, 42 for supporting the end sections 15 of the spring legs 14 of the restoring spring 13, which are bent at right angles to the

side walls

2, 3.

The fifth embodiment of the intermediate lever 1.5 according to the invention, which is depicted in different perspective views in fig. 5 and 5a, of the variable valve gear differs from the previously described embodiments of the intermediate levers 1.1 to 1.4 according to fig. 1 to 4a in that the

webs

43, 44 are now formed so as to be bent at right angles inward, wherein the end faces of the

webs

43, 44 are arranged at a distance from one another, i.e., do not abut one another. The outer side faces 45, 46 of the

webs

43, 44 are formed flat and in this embodiment also form separate flat bearing faces 47, 48 for supporting the end sections 15 of the spring legs 14 of the restoring spring 13 bent at right angles to the

side walls

2, 3.

The sixth embodiment of the intermediate lever 1.6 according to the invention of the variable valve gear, which is depicted in a first perspective view in fig. 6 and in a detail view of a second perspective view in fig. 6a, differs from the fifth embodiment of the intermediate lever 1.5 according to fig. 5 and 5a in that the end faces of the

webs

49, 50 now bear against one another in the middle. In order to reinforce the intermediate lever 1.6, the

webs

49, 50 can be connected to one another at the end faces in a material-fit manner, for example by soldering or welding. The outer flanks 51, 52 of the

webs

49, 50 are formed flat as before, and now form a common, flat bearing surface 53 for supporting the end section 15 of the spring leg 14 of the restoring spring 13 bent at right angles to the

side walls

2, 3. In the case of soldering or welding of the connecting

webs

49, 50, any burrs which may be present in the region of the end faces must therefore be removed by mechanical reworking.

A seventh embodiment of the intermediate lever 1.7 according to the invention, which is depicted in a first perspective view in fig. 7 and in a detail view of a second perspective view in fig. 7a, of the variable valve gear differs from the sixth embodiment of the intermediate lever 1.6 according to fig. 6 and 6a in that the outer flanks 51 ', 52' are each provided on the outer edges of the end faces with a step forming a V-shaped recess 54.

In this embodiment of the webs 49 ', 50', the outer sides 51 ', 52' of the webs 49 ', 50' can form separate, flat bearing surfaces 55, 56 for supporting the end sections 15 of the spring legs 14 bent at right angles to the

side walls

2, 3, as is shown in fig. 7 a. Alternatively, however, it is also possible for the V-shaped recess 54 to form a receptacle 57 for supporting and laterally guiding the end section 16 of the spring leg 14' bent parallel to the

side walls

2, 3, as shown in fig. 7 b. In both embodiments and support types of the spring legs 14,14 ', the contact of the

end sections

15, 16 of the spring legs 14, 14' with burrs which may be present in the contact regions of the end faces of the webs 49 ', 50' is excluded, so that no mechanical reworking is required in connection with this.

The eighth embodiment of the intermediate lever 1.8 according to the invention, which is depicted in a first perspective view in fig. 8 and in a second perspective view in fig. 8a and 8b, of the variable valve drive, differs from the two previously described embodiments of the intermediate lever 1.6, 1.7 according to fig. 6 to 7b in that the outer flanks 60, 61 of the

webs

58, 59 are convexly curved and are each provided on the end side with a step forming a flat recess 62.

In this embodiment of the

webs

58, 59, the outer sides 60, 61 of the

webs

58, 59 can form separate, curved bearing surfaces 63, 64 for supporting the end sections 15 of the spring legs 14 bent at right angles to the

side walls

2, 3, as shown in fig. 8 a. In this embodiment and the type of support of the spring leg 14, the contact of the end section 15 of the spring leg 14 with burrs which may be present in the contact region of the end faces of the

webs

58, 59 is excluded. Alternatively, however, it is also possible for the bottom wall 65 of the flat recess 62 to form a bearing surface 66 for supporting the end section 16 of the spring leg 14' that is bent parallel to the

side walls

2, 3. The step of the

webs

58, 59 then also leads to the end section 16 of the lateral guide spring leg 14'. In this embodiment and support type of the spring leg 14 ', a mechanical reworking of the flat recess 62 is of course necessary in order to avoid contact of the end section 16 of the spring leg 14' with burrs which may be present in the contact region of the end faces of the

webs

58, 59.

A ninth embodiment of the variable valve gear, depicted in a first perspective view in fig. 9 and in a second perspective view in fig. 9a and 9b, respectively, of the intermediate lever 1.9 according to the invention differs from the three previously described embodiments of the intermediate levers 1.6, 1.7, 1.8 according to fig. 6 to 8b in that the

webs

67, 68 are convexly curved inward, so that the outer flanks 69, 70 of the

webs

67, 68 form a V-shaped recess 71 in the middle.

In this embodiment of the

webs

67, 68, the outer sides 69, 70 of the

webs

67, 68 form separate, curved bearing surfaces 72, 73 for supporting the end sections 15 of the spring legs 14 bent at right angles to the

side walls

2, 3, as shown in fig. 9 a. Alternatively, however, it is also possible for the V-shaped recess 71 to form a receptacle 74 for supporting and laterally guiding the end section 16 of the spring leg 14' that is bent parallel to the

side walls

2, 3. In both embodiments and support types of the spring legs 14,14 ', contact of the

end sections

15, 16 of the spring legs 14, 14' with burrs that may be present in the contact regions of the end faces of the

webs

67, 68 is excluded.

The tenth embodiment of the intermediate lever 1.10 according to the invention, depicted in different perspective views in fig. 10 and 10a, of the variable valve gear differs from the four embodiments of the intermediate levers 1.6 to 1.9 according to fig. 6 to 9b described above in that the

webs

75, 76 are convexly curved axially inward, so that the outer flanks 77, 78 of the

webs

75, 76 form a common, curved bearing surface 79 for supporting the end sections 15 of the spring legs 14 bent at right angles to the

side walls

2, 3. In particular in the case of welding or soldering of the connecting

webs

75, 76, any burrs which may be present in the region of the end faces must therefore be removed by mechanical reworking.

List of reference numerals:

1.1 intermediate lever, first embodiment

1.2 intermediate lever, second embodiment

1.3 intermediate lever, third embodiment

1.4 intermediate Lever, fourth embodiment

1.5 intermediate Lever, fifth embodiment

1.6 intermediate lever, sixth embodiment

1.7 intermediate lever, seventh embodiment

1.8 intermediate lever, eighth embodiment

1.9 intermediate lever, ninth embodiment

1.10 intermediate lever, tenth embodiment

2 first side wall

3 second side wall

4 slope body

5 slope surface on slope body

6 tappet roller

Thrust surface of 7 tappet roller

8 first shaft bolt

9 adjusting and/or supporting roller

10 external thrust surface

11 internal thrust surface

12 second shaft bolt

13 return spring, torsion coil spring

Spring leg of 14, 14' return spring

15 end section

16 end section

17 outer edge

18 outer edge

19 connecting sheet

20 connecting sheet

21 outer surface, end surface

22 outer surface, end surface

23 bearing surface

24 bearing surface

25 connecting sheet

26 connecting sheet

27 end face

28 end face

29 bearing surface

30 bearing surface

31 connecting sheet

32 connecting sheet

33 end face

34 end face

35 bearing surface

36 bearing surface

37 connecting piece

38 connecting piece

39 outer side surface

40 outer side face

41 bearing surface

42 bearing surface

43 connecting sheet

44 connecting sheet

45 outer side face

46 outer side surface

47 bearing surface

48 bearing surface

49, 49' connecting piece

50, 50' connecting sheet

51, 51' outer side

52, 52' outer side

53 bearing surface

54V-shaped concave part

55 bearing surface

56 bearing surface

57 accommodating part

58 connecting sheet

59 connecting sheet

60 outer side surface

61 outer side

62 flat recess

63 bearing surface

64 bearing surface

65 bottom wall

66 bearing surface

67 connecting sheet

68 connecting sheet

69 outer side

70 outer side

71V-shaped concave part

72 bearing surface

73 bearing surface

74 accommodating part

75 connecting sheet

76 connecting sheet

77 outer side surface

78 outer side

79 bearing surface

Claims

1. Intermediate lever (1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10) of a variable valve train, which is produced in a plate-shaped manner and has at least one bearing surface (23, 24; 29, 30; 35, 36; 41, 42) for supporting a spring leg (14, 14') of a return spring (13), and which has two side walls (2, 3) which are parallel to one another at least in sections, wherein the two side walls (2, 3) are connected to one another via a ramp body (4) having an outer ramp surface (5), wherein a tappet roller (6) is arranged between the two side walls (2, 3) in a rotatably mounted manner, and wherein an adjusting and/or supporting roller (9) is arranged in a rotatably mounted manner on a free end of the side walls (2, 3),

it is characterized in that the preparation method is characterized in that,

the two side walls (2, 3) are each provided at their outer edges (17, 18) facing the free end of the spring leg (14) with a projecting web (19, 20; 25, 26; 31, 32; 43, 44; 49, 50; 49 ', 50'; 58, 59; 67, 68; 75, 76), the webs (19, 20; 25, 26; 31, 32; 37, 38; 43, 44; 49, 50; 49 ', 50'; 58, 59; 67, 68; 75, 76) being arranged axially opposite one another on the longitudinal side between the tappet roller (6) and the ramp body (4), and the webs (19, 20; 25, 26; 31, 32; 37, 38; 43, 44; 49, 50; 49 ', 50'; 58, 59; 67, 68; 75, 76) each having an outer surface (21, 22; 27, 28; 33, 34; 39, 40; 45, 46; 51, 52 '; 51, 60; 51, 52'; 51, 61; 69, 70; 77, 78) forming separate bearing surfaces (23, 24; 29, 30; 35, 36; 41, 42; 47, 48; 55, 56; 63, 64; 72, 73) or a common bearing surface (53; 66; 79).

2. Intermediate lever (1.1) according to claim 1,

the webs (19, 20) project flat from the outer edges (17, 18) of the side walls (2, 3), and the outer end faces (21, 22) of the webs (19, 20) form separate bearing surfaces (23, 24) for supporting the end sections (15) of the spring legs (14) that are bent away from the side walls (2, 3).

3. Intermediate lever (1.2, 1.3) according to claim 1,

the connecting webs (25, 26; 31, 32) are T-shaped, and the outer end faces (27, 28; 33, 34) of the connecting webs (25, 26; 31, 32) form separate bearing surfaces (29, 30; 35, 36) for supporting end sections (15) of the spring legs (14) that are bent relative to the side walls (2, 3).

4. Intermediate lever (1.2, 1.3) according to claim 2 or 3,

the T-shaped configuration of the connecting pieces (31, 32) is produced by folding inwards and outwards or folding outwards and inwards with a length ratio of 1: 2.

5. Intermediate lever (1.4) according to claim 1,

the webs (37, 38) are bent outwards, and the outer sides (39, 40) of the webs (37, 38) form separate bearing surfaces (41, 42) for supporting the end sections (15) of the spring legs (14) bent at right angles to the side walls (2, 3).

6. Intermediate lever (1.5) according to claim 1,

the connecting webs (43, 44; 49, 50; 49 ', 50 '; 58, 59; 67, 68; 75, 76) are bent inward, and the outer sides (45, 46; 51, 52; 51 ', 52 '; 60, 61; 69, 70; 77, 78) of the connecting webs (43, 44; 49, 50; 49 ', 50 '; 58, 59; 67, 68; 75, 76) form at least one flat or curved bearing surface (47, 48; 53; 55, 56; 63, 64; 66; 72, 73; 79) for supporting the end sections (15, 16) of the spring legs (14, 14 ').

7. Intermediate lever (1.5) according to claim 6,

the end faces of the webs (43, 44) are arranged at a distance from one another, and the outer side faces (45, 46) of the webs (43, 44) are formed flat and form bearing surfaces (47, 48) for separation, which support the end sections (15) of the spring legs (14) bent at right angles to the side walls (2, 3).

8. Intermediate lever (1.6) according to claim 6,

the end faces of the webs (49, 50) rest against one another in the middle, and the outer sides (51, 52) of the webs (49, 50) are formed flat and form a common bearing surface (53) for supporting the end sections (15) of the spring legs (14) bent at right angles to the side walls (2, 3).

9. Intermediate lever (1.7) according to claim 6,

the end faces of the webs (49 ', 50 ') rest against one another in the middle, the outer side faces (51 ', 52 ') of the webs (49 ', 50 ') are formed flat and are provided with end faces on the outer edges, each of which has a step forming a V-shaped recess (54), and the outer side faces (51 ', 52 ') of the webs (49 ', 50 ') form separate bearing surfaces (55, 56) for supporting the end sections (15) of the spring legs (14) bent at right angles to the side walls (2, 3), or the V-shaped recesses (54) form receptacles (57) for supporting and laterally guiding the end sections (16) of the spring legs (14 ') bent parallel to the side walls (2, 3).

10. Intermediate lever (1.8) according to claim 6,

the end faces of the webs (58, 59) rest against one another in the middle, the outer sides (60, 61) of the webs (58, 59) are convexly curved and are each provided at the end with a step forming a flat recess (62), and the outer sides (60, 61) of the webs (58, 59) form separate, curved bearing surfaces (63, 64) for supporting the end sections (15) of the spring legs (14) bent at right angles to the side walls (2, 3), or the base walls (65) of the flat recesses (62) form bearing surfaces (66) for supporting the end sections (16) of the spring legs (14') bent parallel to the side walls (2, 3).

11. Intermediate lever (1.9) according to claim 6,

the end faces of the webs (67, 68) rest against one another in the middle, the webs (67, 68) are convexly curved inward, such that the outer sides (69, 70) of the webs (67, 68) form a V-shaped recess (71) in the middle, and the outer sides (69, 70) of the webs (67, 68) form separate, curved bearing surfaces (72, 73) for supporting the end section (15) of the spring leg (14) bent at right angles to the side walls (2, 3), or the V-shaped recess (71) forms a receptacle (74) for supporting and laterally guiding the end section (16) of the spring leg (14') bent parallel to the side walls (2, 3).

12. Intermediate lever (1.10) according to claim 6,

the end faces of the webs (75, 76) bear against one another in the middle, and the webs (75, 76) are convexly curved inward, so that the outer flanks (77, 78) of the webs (75, 76) form a common, curved bearing surface (79) for supporting the end section (15) of the spring leg (14) bent at right angles to the side walls (2, 3).

13. Intermediate lever according to one of the claims 8 to 12,

the connecting webs (49, 50; 49 ', 50'; 58, 59; 67, 68; 75, 76) are connected to one another in a material-fit manner at the end faces lying against one another.