CN111434905A

CN111434905A - Adjusting device for actuating a switching valve of an internal combustion engine with variable compression ratio and method for producing the same

Info

Publication number: CN111434905A
Application number: CN201911112382.6A
Authority: CN
Inventors: 克里斯蒂安·雍; 亚历山大·穆德拉; 迪特玛·舒尔茨
Original assignee: Eco Holding 1 GmbH
Current assignee: Eco Holding 1 GmbH
Priority date: 2019-01-15
Filing date: 2019-11-14
Publication date: 2020-07-21
Also published as: DE102019100952A1

Abstract

The invention relates to a control device (10) for actuating a tap element of a switching valve of an eccentric control device of at least one connecting rod of an internal combustion engine having a variable compression ratio, which tap element is arranged in a connecting rod bearing cap of the connecting rod in a longitudinally displaceable or pivotable manner, wherein the tap element can be displaced or pivoted longitudinally by the control device in one of its two movement directions. The adjusting device (10) comprises at least one guide element (12) and at least one runner device (14) rigidly connected to the guide element (12). According to the invention, the at least one runner arrangement (14) has at least two side parts (16, 18) which engage the guide element (12) in a manner connected to the arrangement. The invention also relates to a method for producing the adjusting device (10).

Description

Adjusting device for actuating a switching valve of an internal combustion engine with variable compression ratio and method for producing the same

Technical Field

The invention relates to a control device for actuating a tap element of a switching valve of an eccentric control device of a connecting rod of an internal combustion engine having a variable compression ratio, which tap element is arranged in a connecting rod bearing cap of at least one connecting rod in a longitudinally displaceable or pivotably displaceable manner, and to a method for producing such a control device.

Background

In internal combustion engines, a high compression ratio has a positive effect on the efficiency of the internal combustion engine. The compression ratio is generally understood as the ratio of the entire cylinder space before compression to the remaining cylinder space after compression. In internal combustion engines with external ignition, in particular gasoline motors with a fixed compression ratio, the compression ratio can however be selected so high that so-called "knocking" of the internal combustion engine is avoided during full operation. However, for the more frequently occurring partial load range of the internal combustion engine, that is to say in the case of low cylinder filling, it is possible to select a compression ratio with a higher value without "knocking" occurring. If the compression ratio is variably adjustable, the important part load range of the internal combustion engine can be improved. For adjusting the compression ratio, systems with variable link length are known, for example.

DE 102015224157 a1 discloses a device for actuating a switching element of a device for changing the compression ratio of a cylinder unit of a reciprocating internal combustion engine having a connecting rod, which switching element is arranged in a connecting rod bearing cap of the connecting rod in a longitudinally or correspondingly pivotably movable manner. The device of the switching element comprises an adjusting device which selectively causes a longitudinal displacement or pivoting of the switching element in one of its two directions of movement and which is movably arranged in the crankcase of the reciprocating internal combustion engine and is driven by the adjusting device. The adjusting means comprise a guide rod and a cam disk element which is rigidly connected to the guide rod and is designed as a plate part. The cam disc element is rigidly connected to the guide rod by riveting.

Disclosure of Invention

The object of the present invention is to provide a control device for actuating a tap element of a control valve of an internal combustion engine with a variable compression ratio, which can be produced cost-effectively and has safe control properties.

Another object is to provide a method of manufacturing such an adjustment device.

The above object is achieved by the features according to the invention.

Advantageous embodiments and advantages of the invention emerge from the description and the drawings of the preferred embodiments.

According to one aspect of the invention, a control device is proposed for actuating a tap element of a switching valve of an eccentric control device with connecting rods of an internal combustion engine with variable compression ratio, which tap element is arranged in a connecting rod bearing cap of at least one connecting rod so as to be longitudinally displaceable or pivotable, wherein the tap element can be displaced or pivoted longitudinally by the control device in one of its two directions of movement. The adjusting device comprises at least one guide element and at least one runner device rigidly connected to the guide element.

According to the invention, the at least one runner arrangement has at least two side parts which engage the guide element in a manner connected to the arrangement.

The adjusting device serves as a switching gate for the mechanical actuation of a connecting rod for an internal combustion engine having a variable compression ratio. By means of which the low compression ratio can be adjusted by means of the tap element of the hydraulic switching valve (_low) And a high compression ratio of (_high) In the switching position of the connecting rod. The adjusting device according to the invention is simpler to construct in terms of production technology than the embodiments of the prior art and can therefore be produced significantly more advantageously in terms of time and cost.

By using, for example, a simple rotary part as the adjusting lever and the guide element, a construction can be shown which has a welded bending plate as a side part of the gate arrangement and at least two bearing elements which are mounted in the internal combustion engine below the so-called bottom plate or cylinder liner, which construction can be time-and/or cost-saving during production. At least one bearing element can be used as an adjustment stop and rotation prevention part of an adjustment device by means of a pin pressed into an adjustment lever or a bearing block, the adjustment device acting as a switching gate. The very high precision requirements of milled switching chutes, for example, formed from a single component, are transferred to the mounting and welding device. This means that not every switching chute is individually time-consuming and/or expensive to order and manufacture, but the switching chutes can only be assembled and connected by a plurality of simply constructed individual components and suitable mounting and welding devices. Here, as a main component of the switching chute, a simple rotary part can be used as an adjusting lever and a guide element. The transition edge is realized as a side part, for example, by a bent plate which is positioned by the mounting device and then connected to the adjusting lever, in particular by welding. The side pieces may be provided with holes or recesses. The curved plate with the hole may be pushed onto the adjustment rod before the welding process. The side parts with holes allow circumferential welding, which has a favorable effect on the power transmission and thus the durability of the switching link. Differently, the notched side piece can be mounted more easily and the damaged side piece found later can still be replaced without problems as long as all other side pieces have been welded and the damaged side piece has not been welded. For adjusting the shift gate, a hydraulic or electric linear or rotary motor can be used.

According to an advantageous embodiment, at least one of the link devices and/or the two side parts can be formed as a plate part. The plate part can be manufactured simply and is therefore very cost-effective. In addition, the plate member can be easily expressed in a desired shape, and thus is very flexible in design.

According to an advantageous embodiment, the at least one runner arrangement can be designed as a tool-free part, in particular as one of a plate bending part, a casting, a sintering, a Metal Injection Molding (MIM). The gate arrangement with its at least two side parts can thus be represented by an advantageous production method, which greatly simplifies the production of the entire control device and is designed cost-effectively. In an alternative embodiment, it is also possible for the two side parts to be connected by a common connecting section, and for the runner arrangement to be of one-piece design.

According to an advantageous embodiment, the at least one runner arrangement can be connected to the guide element by a welding method. The sliding-channel arrangement with its at least two side parts can be suitably positioned in place on the guide element as an adjusting lever and firmly and permanently connected to the guide element, for example by welding. The welding method is a suitable joining technique, even under the severe operating requirements of the internal combustion engine. The side part can advantageously be welded to the guide element so as to surround the guide element.

According to an advantageous embodiment, the guide element can be formed as a rod or plate bending part. The guide element can thus advantageously be represented as a lever or a rotary part as an adjusting lever of the adjusting device, for example. Alternatively, the guide element can also be advantageously represented as a simple plate-bending part and thus have a suitable receptacle for the gate arrangement.

According to an advantageous embodiment, the two side parts can have a hole or a recess for receiving the guide element. In this way, the side part can be easily positioned on the guide element, for example in the joining device, and can be permanently connected to the guide element simply, for example by welding. As a result, the plate part, which is produced relatively inaccurately, is positioned with great precision and is firmly connected to the guide element. This enables a high degree of accuracy of the produced adjusting device to be achieved.

According to an advantageous embodiment, the guide element can have a rotation prevention part for installation in the internal combustion engine as intended. The guide element can be firmly connected to the internal combustion engine, for example a cylinder block, by means of suitable bearing elements. By preventing the rotation portion, the rotation of the chute device can be prevented. This ensures a reliable function and switching of the tap element of the switching valve in the connecting rod and thus a reliable switching behavior of the entire connecting rod.

According to an advantageous embodiment, the guide element can be mounted so as to be longitudinally displaceable via the bearing element. The bearing element is designed as a sliding bearing and is screwed fixedly to a region of the internal combustion engine, for example, a cylinder block. Thus, the guide element may be moved over a predetermined length and the device adjusted thereby causing a switching function in the switching valve.

According to an advantageous embodiment, at least one bearing element has a path definition which guides the longitudinal displacement of the element. The guide element may for example have a pin which is movable in a groove arranged in the bearing element. Thus, although the guide element can be moved in a predetermined longitudinal path, a predetermined path definition is obtained by the groove. An alternative path definition can be achieved by a recess on the guide element, in which the projection of the bearing element can move.

According to an advantageous configuration, the rotation prevention portion may be formed by a groove arranged in the bearing element and a pin longitudinally movably arranged in the groove. In this way, the guide element, although being longitudinally displaceable in its bearing element, cannot tilt or rotate with the runner arrangement arranged thereon.

According to an advantageous embodiment, the guide element can have a receptacle for the manipulator. By means of the actuator, the guide element can be moved longitudinally displaceably and thus a change of the switching position of the connecting rod can be effected in the connecting rod by a movement of the tap element of the switching valve. The manipulator serves for linear movement of the guide element and can therefore be arranged at any position of the guide element.

According to an advantageous embodiment, the guide element can have a restoring device in the initial state of the longitudinally movable adjusting device when installed as intended in the internal combustion engine, wherein the restoring device comprises in particular a restoring spring. Since the adjusting device is fixedly connected with the cylinder block by means of the bearing element, the adjusting device can be defined by a path-defining section, which moves linearly on the manipulator on a predetermined path. The end point of the movement represents the desired switching position of the connecting rod. If a restoring device (e.g., a restoring spring) acts on the guide element, it can thereby be brought about that the adjusting device is in the initial state as the basic position even in the non-driven state when the actuator is, for example, de-energized. Thus, a safe state of the adjusting device and thus of the connecting rod for operating the variable compression ratio of the internal combustion engine can be achieved.

According to a further aspect of the invention, a method is proposed for producing a control device for actuating a tap element of a switching valve of an eccentric control device having connecting rods of an internal combustion engine with a variable compression ratio, which tap element is arranged in a connecting rod bearing cap of at least one connecting rod in a longitudinally displaceable or pivotable manner, wherein the tap element can be displaced or pivoted longitudinally by the control device in one of its two directions of movement. The method at least comprises the following steps: -arranging a guide element and at least one runner arrangement with at least two side parts in an engagement arrangement, wherein the guide element and the at least one runner arrangement are arranged in a fixed relative position to each other; -connecting at least one runner arrangement with the guide element by at least one of welding, pressing, crimping, gluing, screwing; and-mounting the bearing element on the guide element.

What can be achieved with regard to the production of the adjusting device constructed according to the invention by means of a high-precision joining device is that the adjusting device thus produced has the required precision even in the case of individual components whose production precision is not high. The manufacturing costs of a high-precision production of the individual components can therefore be transferred to a single high-precision production of the joining device, while the individual components themselves only have to be manufactured with a lower precision. This accommodates the use of a simple plate flexure for the adjustment device. For connecting the chute arrangement to its side parts, cost-effective connecting processes, such as welding, pressing, crimping, gluing, screwing, can be used. After the connecting process, the bearing block can be mounted as a bearing element on the guide element to complete the adjusting device. In this way, a time-and cost-effective production of the adjusting device can be achieved.

Drawings

Further advantages result from the following description of the figures. Embodiments of the invention are shown in the drawings. The figures, description and claims contain a number of features in combination. The person skilled in the art will likewise suitably examine the features individually and in reasonable further combinations.

For example, show:

fig. 1 shows an adjusting device according to the invention in an isometric view, with a sliding groove arrangement on the rod as a guide element;

fig. 2 shows the adjusting device according to fig. 1 in a plan view with the sectional planes a-a and B-B drawn;

fig. 3 shows the adjusting device in a longitudinal section a-a according to fig. 2;

fig. 4 shows the bearing element in a longitudinal section B-B according to fig. 2;

fig. 5 shows a side part of the chute arrangement with a hole;

fig. 6 shows a side part of the chute arrangement with a notch;

fig. 7 shows an isometric view of an adjusting device according to a further embodiment of the invention, which has a slotted guide arrangement as a guide element on the plate bending part;

fig. 8 shows the gate arrangement according to fig. 7 in a plan view, with two side parts;

fig. 9 shows a guide element of the adjusting device according to fig. 7 in a side view;

fig. 10 shows a guide element of the adjusting device according to fig. 7 in a top view;

fig. 11 shows a longitudinal section through the adjusting device according to fig. 7.

Detailed Description

In the figures, identical or similar components are numbered with the same reference numerals. These figures illustrate examples only and are not to be construed as limiting.

Fig. 1 shows an isometric view of an adjusting device 10 according to the invention with a runner device 14 on the rod as a guide element 12, while fig. 2 shows the adjusting device 10 in a top view with the sectional planes a-a and B-B drawn.

The adjusting device 10 is provided for actuating a longitudinally displaceable or pivotably movably arranged tap element of a changeover valve in a connecting rod bearing cap of at least one connecting rod, wherein the changeover valve brings about an adjustment of the connecting rod length in order to thereby control the compression ratio of the internal combustion engine. The connecting rod, switching valve and tap-off element are not shown in fig. 1.

By means of the adjusting device, a longitudinal displacement or pivoting of the tapping element can be achieved in one of its two directions of movement. The adjusting device comprises a guide element 12 designed as a rod and a plurality of runner arrangements 14 rigidly connected to the guide element 12, wherein the number of runner arrangements 14 preferably corresponds to the number of cylinders in the internal combustion engine. The gate arrangement 14 according to the invention has two

side parts

16, 18, respectively, which engage the guide element 12 in a manner connected to the arrangement. By means of the longitudinal displacement of the shifting device 10, a displacement of the tap element of the shifting valve into the shifting position and in the opposite direction into the second shifting position can be achieved by means of the two

side parts

16, 18, respectively.

The two

side parts

16, 18 are formed as plate parts. The guide element 12 is formed as a rod. The

side parts

16, 18 each extend onto the shank and are welded to the shank, for example along a joining line, shank-cut-out, side part. . For this purpose, the two

side parts

16, 18 have holes, which are shown in more detail in fig. 5.

The guide element 12 is mounted in two bearing blocks as bearing

elements

20, 21 so as to be longitudinally displaceable. The bearing

elements

20, 21 are expediently designed as sliding bearings. The bearing

elements

20, 21 can be screwed to the cylinder block of the internal combustion engine with two screws 22, respectively. The bearing element 21 has a recess 24 in which a pin 26 firmly connected with the guide element 12 achieves the rotation prevention part 40 and the path definition. At the end of the guide element 12, a receptacle 28 for a manipulator is arranged, which causes a drive for the longitudinal displacement of the adjusting device. The receptacle 28 may be comprised of one or more voids, holes, or the like.

When installed as intended in an internal combustion engine, the guide element 12 may optionally have a resetting device in the initial state of the longitudinally movable adjusting device 10. For example, such a return device may comprise a return spring, which in turn may be connected to the cylinder head.

Fig. 3 shows the adjusting device 10 in a longitudinal section a-a according to fig. 2. In this section, the rotation prevention part 40 can be seen in the cut-out bearing element 21, which is realized by a pin 26 fixedly connected with the guide element 12, which pin can be moved in the longitudinal direction with the guide element 12 in the recess 24 of the bearing element 21.

In fig. 4 the bearing element 20 is shown in a longitudinal section B-B according to fig. 2. The bearing element 20 has a bore 34 through which a rod as a guide element 12 can be inserted. Two screws 22 can be seen perpendicular to the bore, with which the bearing element 20 can be screwed to the cylinder block of the internal combustion engine.

Fig. 5 and 6 show the

side parts

16, 18 of the gate arrangement 14. The

side parts

16, 18 in fig. 5 have holes 30 for the guide elements 12. Thus, when mounting the

side parts

16, 18 on a rod as the guide element 12, the rod is inserted through the hole 30 and the two parts are then welded to each other, for example in a joining device. Conveniently, a weld is provided around the circumference of the bore 30.

The

side parts

16, 18 in fig. 6 have recesses 32, by means of which the

side parts

16, 18 can be inserted as guide elements 12 onto the rod. In this way, the assembly of the

side parts

16, 18 can be designed more simply. In this case, the weld at the connection between the

side parts

16, 18 and the bar is located on the semicircular circumference of the recess 32.

Fig. 7 shows an adjusting device 10 according to a further exemplary embodiment of the invention in an isometric view, which has a slotted guide arrangement 14 on a plate bending part as a guide element 12. Fig. 8 also shows a single gate device 14 according to fig. 7 with two

side parts

16, 18 in a plan view. The guide element 12 of the adjusting device 10 according to fig. 7 is shown in a side view in fig. 9 and in a top view in fig. 10. Fig. 11 shows a longitudinal section through the adjusting device 10.

The guide element 12 is formed as a plate-shaped bent part and, as can be seen in particular from a side view, has a rectangular recess as a receptacle 36 for the gate arrangement 14. As can be seen in fig. 8, the gate arrangement 14 has two

curved side parts

16, 18, which can also be designed as plate-bending parts. Alternatively, however, it is also possible for the gate arrangement 14 to be formed as a tool-free part, in particular as one of a plate bending part, a cast part, a sintered part, a metal injection molding part.

In a further alternative, it can be provided that the two

side parts

16, 18 are connected by a common connecting section, and the slotted-link arrangement 14 is thus formed in one piece.

The guide element 12 has an elongated hole 38, on which the

bearing elements

20, 21 can each be arranged as a slide bearing, for example by means of screws 22, pins or rivets. In the exemplary embodiment shown, the long hole 38 serves as a recess for the screw 22 and enables a linear movement of the guide element 12 relative to the bearing element 20. The recess 42 on the guide element 12, together with the bearing element 21 arranged on the left in the drawing, also achieves a path definition of the linear movement to prevent the screw 22 from stopping at the end of the long hole 38. The rotation prevention is unnecessary because the rotation prevention is automatically obtained by the plate bending member as the guide member 12 and the bearing member 20 having its guide portion for the guide member 12. In this embodiment, a receptacle 28 for the connection of the manipulator can be provided by a left-hand hole in the guide element 12.

The two embodiments of the adjusting device 10 shown in fig. 1 to 11 can be produced by performing at least the following steps: arranging the guide element 12 and the at least one runner arrangement 14 with the at least two

side parts

16, 18 in the engagement arrangement, wherein the guide element 12 and the at least one runner arrangement 14 are arranged in a fixed relative position to each other; -engaging at least one runner arrangement 14 with the guide element 12 by at least one of welding, pressing, crimping, gluing, screwing; and-mounting the bearing element 20 on the guide element 12.

Claims

1. Adjusting device (10) for actuating a tap element of a switching valve of an eccentric adjusting device of at least one connecting rod of an internal combustion engine having a variable compression ratio, which tap element is arranged longitudinally displaceably or pivotably movably in a connecting rod bearing cap of the connecting rod, wherein the tap element can be displaced or pivoted longitudinally in one of its two directions of movement by means of the adjusting device,

the adjusting device comprises at least one guide element (12) and at least one runner device (14) rigidly connected to the guide element (12),

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

the at least one runner arrangement (14) has at least two side parts (16, 18) which engage the guide element (12) in a manner connected to the arrangement.

2. Adjusting device according to claim 1, characterized in that the at least one runner arrangement (14) and/or the two side parts (16, 18) are configured as plate parts.

3. The adjusting apparatus according to claim 1 or 2, characterized in that the at least one runner arrangement (14) is configured as a tool-free part, in particular as one of a plate bending part, a casting, a sintering, a metal injection molding.

4. Adjusting device according to one of the preceding claims, characterized in that the at least one runner device (14) is connected with the guide element (12) by means of a welding method.

5. Adjusting device according to one of the preceding claims, characterized in that the guide element (14) is configured as a rod or plate bending part.

6. The adjusting apparatus according to one of the preceding claims, characterized in that the two side parts (16, 18) have a hole (30) or a recess (32) for accommodating the guide element (12).

7. The adjusting apparatus according to one of the preceding claims, characterized in that the guide element (12) has a rotation-preventing part (40) for installation as intended in an internal combustion engine.

8. Adjusting device according to one of the preceding claims, characterized in that the guide element (12) is supported longitudinally displaceably by means of a bearing element (20, 21).

9. Adjusting device according to claim 8, characterized in that the at least one bearing element (21) has a path definition which guides the longitudinal displacement of the element (12).

10. The adjusting apparatus according to one of claims 7 to 9, characterized in that the rotation-preventing part (40) is constructed by means of a groove (24) arranged in the bearing element (21) and a pin (26) arranged longitudinally movably in the groove (24).

11. The adjusting apparatus according to one of the preceding claims, characterized in that the guide element (12) has a receptacle (28) for a manipulator.

12. The adjusting apparatus according to one of the preceding claims, characterized in that the guide element (12) has a restoring device in the initial state of the longitudinally movable adjusting apparatus (10) when installed as intended in an internal combustion engine, wherein the restoring device comprises in particular a restoring spring.

13. A method for producing a regulating device (10) for actuating a tap element of a changeover valve of an eccentric regulating device of at least one connecting rod of an internal combustion engine having a variable compression ratio, which tap element is arranged longitudinally displaceably or pivotably movably in a connecting rod bearing cap of the connecting rod, wherein the tap element can be displaced or pivoted longitudinally in one of its two directions of movement by means of the regulating device,

the method comprises at least the steps of:

-arranging a guide element (12) and at least one runner arrangement (14) with at least two side parts (16, 18) in an engagement arrangement, wherein the guide element (12) and the at least one runner arrangement (14) are arranged in a fixed relative position to each other;

-engaging said at least one runner arrangement (14) with said guide element (12) by at least one of welding, pressing, crimping, gluing, screwing;

-mounting a bearing element (20) on the guide element (12).