CN114233429A - Switching device for a switchable valve train component of an internal combustion engine and method for producing a switching element of a switching device - Google Patents

Switching device for a switchable valve train component of an internal combustion engine and method for producing a switching element of a switching device Download PDF

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Publication number
CN114233429A
CN114233429A CN202010940944.2A CN202010940944A CN114233429A CN 114233429 A CN114233429 A CN 114233429A CN 202010940944 A CN202010940944 A CN 202010940944A CN 114233429 A CN114233429 A CN 114233429A
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CN
China
Prior art keywords
switching device
switching element
bore
switching
circular
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CN202010940944.2A
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Chinese (zh)
Inventor
弗兰克·希姆塞尔
霍尔格·佩措尔德
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Schaeffler Holding China Co Ltd
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Schaeffler Technologies AG and Co KG
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Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to CN202010940944.2A priority Critical patent/CN114233429A/en
Publication of CN114233429A publication Critical patent/CN114233429A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L2001/186—Split rocking arms, e.g. rocker arms having two articulated parts and means for varying the relative position of these parts or for selectively connecting the parts to move in unison

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The invention relates to a switching device for a switchable valve train component of an internal combustion engine, having at least one switching element (1, 2) which is arranged movably in at least one bore (3, 4) in a housing (5) for switching, characterized in that the switching element (1, 2) having a non-circular circumferential contour (6, 7) is guided with at least three contact points (8, 9) on the inner diameter of the bore (3, 4), and the non-circular circumferential contour (6, 7) is produced in one machining step. The invention further relates to a method for producing a switching element (1, 2) of a switching device for a switchable valve train component of an internal combustion engine.

Description

Switching device for a switchable valve train component of an internal combustion engine and method for producing a switching element of a switching device
Technical Field
The invention relates to a switching device for a switchable valve train component of an internal combustion engine and to a method for producing a switching element of a switching device.
Background
A variable valve train of an internal combustion engine having at least one switchable rocker arm is known from DE102017106689a 1. The valve train has a main lever supported on the end side on the housing and a secondary lever pivotably supported on the main lever. The main rod and the auxiliary rod can be coupled by a coupling element which is guided axially movably in a transverse bore of the main rod. For coupling, the coupling element is displaceable into the associated coupling bore of the respective secondary lever by means of a mechanical adjusting device against the restoring force of the respective associated spring element. In this embodiment, it is disadvantageous that in an oil-containing environment, at low oil temperatures, for example during a cold start of the engine in winter, the displacement force for the coupling element increases due to the increase in the viscosity of the oil. As a result, the actuating force of the actuating device, for example an electromechanical actuator, and thus in particular the installation space of the actuating device or actuator, is increased. In the opposite switching direction, in which the movement is usually effected by spring force, the spring force must be increased. This in turn leads to stronger actuators, the increase of which is technically limited in terms of energy and installation space.
Disclosure of Invention
The object of the invention is to improve the operating characteristics and to design a switching device of the type described above at low cost. Furthermore, it is an object of the present invention to provide a method for manufacturing a switching element of a switching device of the type described above.
This object is achieved by a switching device for a switchable valve train component of an internal combustion engine and a method for producing a switching element of a switching device for a switchable valve train component of an internal combustion engine. Further advantageous embodiments emerge from the description and the drawings.
A switching device for a switchable valve train component of an internal combustion engine is proposed, wherein at least one switching element is arranged movably in at least one bore of a housing for switching. Since the switching element with the non-circular circumferential contour is guided with at least three contact points on the inner diameter of the bore, the contact area of the switching element and thus the displacement force for switching the switching element can be reduced, in particular when the viscosity of the oil increases. While at the same time ensuring a safe guidance in operation on the inner diameter of the bore. By producing the non-circular circumferential contour in one machining step, the costly step-by-step reworking in a plurality of machining steps is avoided, in particular with additional mechanical steps for removing the regions between the contact points.
Simple and cost-effective production of non-circular circumferential profiles in one machining step is possible by grinding or turning. It is also conceivable that the switching element with a non-circular circumferential contour is produced by metal powder injection molding (MIM).
Advantageously, the non-circular circumferential contour corresponds to a constant-thickness shape or is similar to this shape and has the same or approximately the same width at any point as a so-called rolling diameter, with which the switching element can be easily engaged into the bore. The non-circular circumferential contour in the form of a constant thickness can be produced particularly simply.
In a further particularly preferred embodiment of the invention, the housing is formed by a switchable rocker arm having a main lever and a secondary lever which is supported pivotably movably on the main lever. In this case, the primary or secondary lever is preferably coupled for switching by a first switching element which is movable in the first bore and which can be actuated by moving a second switching element which is arranged in the second bore. In this case, the first switching element with the non-circular first circumferential contour is preferably guided with three contact points on the inner diameter of the first bore and the second switching element with the non-circular second circumferential contour is preferably guided with three contact points on the inner diameter of the second bore.
In a further particularly preferred embodiment of the invention, the non-circular circumferential contour is embodied with a plurality of projections which project radially on a predetermined base circle diameter and form contact points on a circumscribed circle diameter.
The non-circular circumferential contour has a polygonal contour, wherein the contact point is formed by a circumferentially rounded edge of the polygon.
Similar or also complex non-circular geometries can also be produced simply and inexpensively by means of non-circular grinding with synchronized rotational speeds.
Non-circular circumferential profiles can be produced particularly simply by centerless grinding.
A switching element having a non-circular circumferential contour according to the invention can be produced particularly advantageously in the method according to the invention.
In addition to the use in switchable rocker arms, the switching device according to the invention can also be used in a particularly advantageous manner in other switchable cam followers of a valve train for an internal combustion engine, in particular in switchable roller tappets or cup tappets, or in switchable supporting elements of a cam follower.
It is also possible to use the switching device according to the invention in other components that can be moved linearly in a cylindrical guide. For example, an electromechanical actuator for actuating a switchable rocker arm system of a valve train of an internal combustion engine is conceivable. The movable armature of the actuator and/or the actuating pin of the actuator can have a non-circular circumferential contour according to the invention. It is also conceivable for the switching device according to the invention to be used in an actuator of a moving cam system for a valve train of an internal combustion engine.
The object of the invention is also achieved by a method for producing a switching element of a switching device for switchable valve train components of an internal combustion engine. According to the invention, the switching element is produced in one production step with a non-circular circumferential contour having projections which project radially over a predetermined base circle diameter. The machining steps are controlled in such a way that the projection forms a contact point on a predetermined circumcircle diameter for guiding the switching element in a bore of the switching device, wherein the circumcircle diameter is slightly smaller than the inner diameter of the bore for engaging into the bore. In this way, the switching element, which has a non-circular circumferential contour and a reduced contact surface with the bore, can be produced inexpensively by mass production and engages with a small clearance into the bore, thereby improving the accuracy and performance of the overall system.
Non-circular circumferential profiles can be produced particularly simply by centerless grinding. In a particularly advantageous manner, it is possible to produce non-circular circumferential profiles in a geometric configuration of uniform thickness without additional effort as production tolerances, which can be easily controlled by suitable process parameters. In particular, a predetermined circumscribed circle diameter and a predetermined base circle diameter of the non-circular circumferential contour can be taken into account for this. In this way, undesired production tolerances of uniform thickness can be used for a particularly simple production of the switching element according to the invention with a non-circular circumferential contour. Since the workpiece is guided without clamping during centerless grinding, the switching element with a non-circular circumferential contour is produced in one process in large numbers, in particular at low cost.
Similar or also complex non-circular geometries can be produced by non-circular grinding, in particular by non-circular grinding with synchronous rotational speeds. Preferably, the workpiece is placed on a circular workpiece support that rotates freely or on a non-circular workpiece support that rotates synchronously with the workpiece. The non-circular circumferential contour of the switching element can be set, for example, by the embodiment of the workpiece holder, in particular of the roller. It is also possible to produce a non-circular circumferential contour by means of a non-circular grinding wheel, wherein the workpiece and the tool are rotated at a defined rotational speed ratio. In this case, the non-circularity of the grinding wheel is transferred to the workpiece. The speed ratio can be adjusted according to the non-circular profile to be produced, for example for producing polygonal profiles.
The method according to the invention can be used particularly advantageously for producing a switching element of a switching device according to the invention according to one of the above-described embodiments.
Drawings
Further features of the invention emerge from the following description and from the drawings, in which several embodiments of the invention are shown in simplified form. The figures show:
figure 1 shows a switching device according to the invention for a switchable valve train component of an internal combustion engine in a first embodiment,
figure 2 shows a switching device according to the invention for a switchable valve train component of an internal combustion engine in a second embodiment,
figures 3 to 7 show different views of a switching device according to the invention in a switchable rocker arm of a valve train for an internal combustion engine,
figures 8 to 12 show different individual views of the switching element of the switching device according to the invention in a first embodiment,
fig. 13 to 17 show different individual views of the switching element of the switching device according to the invention in a second embodiment.
Detailed Description
Fig. 1 and 2 show two exemplary embodiments of a switching device according to the invention for a switchable valve train component of an internal combustion engine. The switching device has a switching element 1, 2, which is arranged movably in a bore 3, 4 of a housing 5 of the valve train part for switching. The switching elements 1, 2 are each embodied with a non-circular circumferential contour 6, 7, which accordingly forms discrete contact points 8, 9, by means of which the switching elements are guided on the inner diameter of the respective bore 3, 4. Thereby reducing the contact length. Here, three contact points 8, 9 are provided, which are distributed uniformly over the circumference. The switching elements 1, 2 each have a base diameter d1、d2The base circle diameter accordingly forms the cross-sectional profile of the cylindrical base body which is slightly longer in the displacement direction. The contact points 8, 9 pass through at the respective base circle diameter d1、d2Is formed by three radial protrusions 10, 11, the apex of which is located at a predetermined circumcircle diameter D1、D2The above. The non-circular circumferential contours 6, 7 each form a polygonal contour, wherein the contact points 8, 9 are formed by regular polygonal edges rounded in the circumferential direction. The radial projections 10, 11 with the contact points 6, 7 extend in the respective bores 3, 4 over the entire guide length L in the displacement direction1、L2And an upper extension. Guide length L1、L2It can correspond here to the entire length of the switching element 1 in the direction of movement or to only a part of this length (fig. 9 to 12 and 13 to 17).
Diameter D of circumscribed circle1、D2Is embodied slightly smaller than the inner diameter of the respective bore 3, 4, so that the respective switching element 1, 2 can engage with slight play into the respective bore 3, 4. By means of the non-circular circumferential contour 6, 7, a reduced contact area is achieved between the switching elements 1, 2 and the respective bores 3, 4. In the embodiment according to fig. 1, the diameter D of the circumscribed circle of the non-circular circumferential contour 61And base circle diameter d1Diameter difference Δ therebetween1Greater than the circumscribed circle diameter D of the non-circular circumferential contour 7 according to the variant of fig. 22And base circle diameter d2Diameter difference Δ therebetween2. At the circumscribed and base circle diameters D1、d1Or D2、d2As large as possible a diameter difference Δ therebetween1、Δ2As large a gap as possible is produced in the free region between the respective projections 10, 11, as a result of which viscous friction in the switching device can be reduced in an oil-containing environment.
The non-circular circumferential contour 6, 7 with the projections 10, 11 and the contact points 8, 9 is produced in one machining step, preferably by grinding or turning. Additional steps, in particular for mechanically clearing the free regions between the contact points 8, 9 or between the projections 10, 11, are thus avoided. In this way, switching elements 1, 2 having corresponding non-circular circumferential contours 6, 7 can be produced simply and inexpensively in high-volume production.
In this case, it is possible in a particularly advantageous manner to produce the non-circular circumferential profiles 6, 7 by machining, in particular by grinding the outer diameter in a centreless manner or by fine turning, respectively, by means of roundness errors of geometric shapes of equal thickness or similar. This shape is characterized in that the diameter, the so-called rolling diameter, is always measured in a two-point measurement, but the circumference is non-circular. In this way, it is possible to produce the switching elements 1, 2 according to the invention with a non-circular circumferential profile particularly easily with production tolerances which are inherently undesirable and which are of uniform thickness and to produce shapes which are similar to uniform thickness particularly easily with suitable process parameters. For evaluating the production, the predetermined circumscribed circle diameter D of the non-circular circumferential contour 6, 7 is taken into account1、D2And a predetermined base circle diameter d1、d2. Here, the diameter D of the circumscribed circle1、D2The control is such that the switching elements 1, 2 can engage with the circumscribed circle diameter into the bores 3, 4 of the switching device with a small play.
In centerless non-circular grinding, the workpiece can be placed on a circular roller that rotates freely or on a non-circular roller that rotates synchronously with the workpiece. During machining, the position of the workpiece axis changes. The workpiece is rotated without slip and in synchronism with the rotation of the grinding wheel. The feed motion can be performed independently of the rotational motion of the grinding wheel. The non-circularity of the workpiece can be made by radial acceleration of the workpiece and can be set by embodiments of the rollers.
Furthermore, similar or also complex geometries can be produced by non-circular grinding with synchronous rotational speeds. In contrast to conventional non-circular grinding, during non-circular grinding with synchronous rotational speeds, non-circular workpiece geometries are produced with the aid of non-circular grinding wheels. The workpiece and the tool rotate in a determined rotational speed ratio. In this case, the non-circularity of the grinding wheel is transferred to the workpiece. The ratio between the workpiece rotation and the tool rotation does not, however, have to be the same, but rather can be adapted to the non-circular contour to be produced. For example, to produce a polygonal profile, the tool rotation is greater than the workpiece rotation.
The switching device according to the invention can be used in a particularly advantageous manner in switchable rocker arms of valve trains for internal combustion engines. Fig. 3 to 17 show exemplary embodiments of a switchable rocker arm with an integrated switching device according to the invention. The switchable rocker arm is essentially composed of two levers mounted in one another, a so-called primary lever 12 and a secondary lever 13 (fig. 3 and 4) which is mounted pivotably on it. The main rod 12 is mounted on the internal combustion engine, in particular on the cylinder head of the internal combustion engine, in a pivotally movable manner in the region of the rod end on the support side with the hemispherical bearing surface 14. At least one valve contact surface 15 is formed on the lower side of the rod in the region of the valve-side rod end for actuating at least one not shown inlet valve of the internal combustion engine.
For switching, the main and auxiliary levers 12, 13 are coupled by an integrated mechanically or electromechanically actuable switching device. The switching device has two switching elements 1, 2 (fig. 3 to 7) which are movable in bores 3, 4 in a housing 5 for switching. The housing 5 is formed by the main rod 12 and is integrated in the rod end region of the support side of the main rod. A first bore 3, which extends along the longitudinal axis of the rod and has a first switching element 1 which is movable therein, and a second bore 4, which perpendicularly intersects the first bore 3 and extends transversely to the longitudinal axis of the rod, and which has a second switching element 2 arranged therein, are formed in the housing 5.
In the region of the intersection of the first and second bores 3, 4, the switching elements 1, 2 are connected in an articulated manner via a 90 ° offset 16 (fig. 4, 6, 9 and 10). By displacing the second shift element 2, the first shift element 1 is placed with a coupling-side free end, via a hinged connection at the offset 16, in a projecting, removable manner on the end of the first bore 3 of the primary lever 12 and with a coupling surface 17 on a corresponding driving surface 18 of the pivotable free end of the secondary lever 13 for coupling.
The first switching element 1, which is guided displaceably in the first bore 3, serves as a so-called blocking or coupling element, by means of which the main and secondary levers 12, 13 can be coupled for switching (fig. 1, 3 to 5 and 7 to 12). Fig. 3 and 4 show the main and auxiliary levers 12, 13 in the basic position, which is not pivoted to one another and is coupled by the first switching element 1. The second shift element 2, which is guided displaceably in the second bore 4, serves as an actuating element and protrudes with its free end at the end of the second bore 4 on the lever longitudinal side of the main lever 12, and is there displaceable in the second bore 4 by a not shown adjusting device, preferably an electromechanical actuator, for shifting (fig. 4, 6 and 13 to 17). In this way, a so-called transverse blocking of the switchable rocker arm is achieved. The movement and the thrust force transmitted by the adjusting device are transmitted in an articulated manner via a 90 ° offset 16 by the second switching element 2 to the first switching element 1 which is movable in the first bore 3. The resetting of the switching elements 1, 2 can be effected by means of at least one spring element arranged in a bore 3, 4 of the switching device.
The switching elements 1, 2 are embodied as switching pins or switching pins. The first switching element 1 is designed according to the embodiment of fig. 1 with a non-circular first circumferential contour 6 and the second switching element 2 is designed according to the embodiment of fig. 2 with a non-circular second circumferential contour 7 (fig. 4 to 7). The switching elements 1, 2 each form three projections 10, 11 on the non-circular circumferential contour 6, 7, which projections each have three contact points 8, 9, by means of which they are guided in the housing 5 of the main rod 12 at the inner diameter of the respective bore 3, 4.
The contact points 8, 9 of the non-circular circumferential contours 6, 7 of the switching elements 1, 2, respectively, are each along the guide length L1、L2In the direction of movement, extends in the respective hole 3, 4 (fig. 8 to 12 or fig. 13 to 17). The first switching element 1 descends twice around the outer circumference (fig. 8 to 12). At the coupling-side end, the first switching element forms a shoulder with a flat coupling surface 17 oriented toward the upper rod side for coupling with the secondary rod 13. On the actuating-side end section facing away from the coupling-side end, the first switching element 1 descends with a flat first bearing surface 22 oriented toward the rod underside. There is a cylindrical guide pin 18 of the offset 16, which projects toward the lever underside and is used for the articulated connection to the second shift element 2. The second shift element 2 descends with the actuating-side end 19 cylindrically radially inward on the outer circumference (fig. 13 to 17). The second switching element 2 projects with the actuating-side end 19 laterally on the end of the second bore 4 on the rod longitudinal side of the main rod 12 and can be moved into the second bore 4 by an electromechanical actuator (not shown) for switching (fig. 3 and 5). In accordance with the first bearing surface 22 on the first switching element 1, the second switching element 2 is lowered on the deflection-side end section facing away from the actuating-side end 19 toward a flat second bearing surface 23 oriented toward the lever top side. A guide groove 20 is embodied thereon, starting from a section of the deflection 16 on the end side on the deflection side of the second switching element 2 (fig. 15 and 16). The first switching element 1 can be supported in a planar manner with a planar first bearing surface 22 on a planar second bearing surface 23 of the second switching element 2 and engages with the guide pin 18 of the offset 16 in the guide groove 20 in an articulated manner on the second bearing surface 23 of the second switching element 2.
By using the switching device according to the invention in a mechanically switchable rocker arm, the displacement forces of the switching elements 1, 2, which are dependent on the viscosity of the oil, are significantly reduced in an oil-containing environment, and the actuating force of the actuating device or actuator and the spring force of the spring element, which is required for resetting, are reduced, which in turn reduces the installation space and the costs for the actuating device and the spring element.
In the intermediate region between the rod ends, a cam roller 21 is provided between two parallel, opposite side wall sections of the secondary rod 13 and is rotatably supported thereon (fig. 4). The cam lifting movement can be obtained on the upper side of the lever by a camshaft, not shown, by means of a cam roller. Alternatively or additionally, a sliding surface is provided on the upper side of the lever in order to obtain the cam lifting movement. In the decoupled state, the secondary lever 13 normally executes a freewheeling motion as a so-called freewheeling motion, in which no valve lift is transmitted. The auxiliary lever 13 can be switched on or off, whereby, in particular, the valve lift can be switched or the valve can be closed in order to close the cylinder. The primary lever 12 can be embodied as an outer lever (fig. 4) which at least partially surrounds the secondary lever 13 as an inner lever. Alternatively, it is also possible to embody the secondary lever 13 as an outer lever which at least partially surrounds the primary lever 12 as an inner lever.
List of reference numerals
1 switching element
2 switching element
3 holes
4 holes
5 casing
6 circumferential profile
7 circumferential profile
8 contact site
9 contact site
10 projection
11 projection
12 main rod
13 auxiliary rod
14 bearing surface
15 valve contact surface
16 deflection unit
17 coupling surface
18 guide pin
19 end section
20 guide groove
21 cam roller
22 bearing surface
23 bearing surface
d1Diameter of base circle
d2Diameter of base circle
D1Diameter of circumscribed circle
D2Diameter of circumscribed circle
L1Guide length
L2Guide length
Δ1Difference in diameter
Δ2Difference in diameter

Claims (10)

1. A switching device for switchable valve train components of an internal combustion engine, having at least one switching element (1, 2) which is arranged movably in at least one bore (3, 4) in a housing (5) for switching, characterized in that the switching element (1, 2) with a non-circular circumferential contour (6, 7) is guided with at least three contact points (8, 9) on the inner diameter of the bore (3, 4) and the non-circular circumferential contour (6, 7) is produced in one machining step.
2. The switching device according to claim 1, wherein the non-circular circumferential profile (6, 7) is made by grinding or turning.
3. The switching device according to claim 1 or 2, wherein the non-circular circumferential profile (6, 7) corresponds to a shape of constant thickness or is similar to such a shape.
4. The switching device according to any one of claims 1 to 3, wherein the housing (5) is constituted by a switchable rocker arm, the rocker arm has a main lever (12) and a secondary lever (13) which is supported on the main lever in a pivotable manner, wherein the main rod (12) or the auxiliary rod (13) can be coupled for switching by a first switching element (1) which can be moved in the first bore (3), the first switching element being operable by movement of a second switching element (2) arranged in a second bore (4), wherein the first switching element (1) having a non-circular first circumferential contour (6) is guided with three contact points (8) on the inner diameter of the first bore (3), and the second switching element (2) having a non-circular second circumferential contour (7) is guided with three contact points (8) on the inner diameter of the second bore (4).
5. The switching device according to any one of claims 1 to 4, wherein the non-circular circumferential profile (6, 7) has a plurality of diameters (d) at a predetermined base circle1，d2) Upper radially projecting lobes (10, 11) forming a diameter (D) lying outside the circle1，D2) Upper contact points (8, 9).
6. The switching device according to one of claims 1 to 5, characterized in that the non-circular circumferential contour (6, 7) has a polygonal contour, wherein the contact points (8, 9) are formed by edges of the polygon rounded in the circumferential direction.
7. The switching device according to any one of claims 1 to 6, wherein the non-circular circumferential profile (6, 7) is made by centerless grinding.
8. The switching device according to any one of claims 1 to 7, wherein the non-circular circumferential profile (6, 7) is produced by non-circular grinding with synchronized rotational speeds.
9. A method for producing a switching element (1, 2) of a switching device of a switchable valve train component of an internal combustion engine, characterized in that the switching element (1, 2) is produced in one process step with a non-circular circumferential contour (6, 7) having a predetermined base diameter (d)1，d2) A projection (10, 11) projecting radially upwards, and the machining step is controlled such that the projection (10, 11) is formed to lie at a predetermined circumscribed circle diameter (D)1，D2) An upper contact point (8, 9) for guiding in a bore (3, 4) of the switching device, wherein the circumscribed circle diameter (D) for engaging into the bore (3, 4)1，D2) Slightly smaller than the inner diameter of the bore.
10. Method according to claim 9, characterized in that the non-circular circumferential profile (6, 7) is manufactured in a form of constant thickness or similar by grinding or turning.
CN202010940944.2A 2020-09-09 2020-09-09 Switching device for a switchable valve train component of an internal combustion engine and method for producing a switching element of a switching device Pending CN114233429A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010940944.2A CN114233429A (en) 2020-09-09 2020-09-09 Switching device for a switchable valve train component of an internal combustion engine and method for producing a switching element of a switching device

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Application Number Priority Date Filing Date Title
CN202010940944.2A CN114233429A (en) 2020-09-09 2020-09-09 Switching device for a switchable valve train component of an internal combustion engine and method for producing a switching element of a switching device

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CN114233429A true CN114233429A (en) 2022-03-25

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107401434A (en) * 2016-05-18 2017-11-28 舍弗勒技术股份两合公司 For the device for the rocking arm for manipulating the valve actuating gear for internal combustion engine
US20180195419A1 (en) * 2015-03-30 2018-07-12 Eaton Corporation Valvetrain with rocker arm housing magnetic latch
DE102017106689A1 (en) * 2017-03-29 2018-10-04 Schaeffler Technologies AG & Co. KG Variable valve train of a combustion piston engine
DE102018115040A1 (en) * 2018-06-22 2019-12-24 Schaeffler Technologies AG & Co. KG Switchable rocker arm for a valve train of an internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180195419A1 (en) * 2015-03-30 2018-07-12 Eaton Corporation Valvetrain with rocker arm housing magnetic latch
CN107401434A (en) * 2016-05-18 2017-11-28 舍弗勒技术股份两合公司 For the device for the rocking arm for manipulating the valve actuating gear for internal combustion engine
DE102017106689A1 (en) * 2017-03-29 2018-10-04 Schaeffler Technologies AG & Co. KG Variable valve train of a combustion piston engine
DE102018115040A1 (en) * 2018-06-22 2019-12-24 Schaeffler Technologies AG & Co. KG Switchable rocker arm for a valve train of an internal combustion engine

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