CN112483214A - Cylinder head module of variable valve mechanism of internal combustion engine - Google Patents
Cylinder head module of variable valve mechanism of internal combustion engine Download PDFInfo
- Publication number
- CN112483214A CN112483214A CN201910865692.9A CN201910865692A CN112483214A CN 112483214 A CN112483214 A CN 112483214A CN 201910865692 A CN201910865692 A CN 201910865692A CN 112483214 A CN112483214 A CN 112483214A
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- cylinder head
- push rod
- camshaft
- head module
- slide
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 10
- 230000007246 mechanism Effects 0.000 title description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 14
- 230000008878 coupling Effects 0.000 claims abstract description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 claims description 2
- 238000005755 formation reaction Methods 0.000 claims 1
- 210000002105 tongue Anatomy 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- 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
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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
- F01L1/14—Tappets; Push rods
- F01L1/146—Push-rods
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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 cylinder head module of a variable valve train of an internal combustion engine, having a row of switching valve struts, wherein each switching valve strut is in contact with a travel cam of a camshaft and has a coupling slide means, the slide means of which protrudes laterally from the switching valve strut, wherein a push rod having an adjusting finger is mounted in the cylinder head parallel to the camshaft, each adjusting finger acting on the slide means of the switching valve strut via a section remote from the push rod, wherein an indirectly acting displacement means for the push rod is used in the cylinder head, which is composed of an axial slide, which is fixed relative to the camshaft and has a feed and return profile for the push rod, wherein a transverse, axially movable control pin with an engagement end for the axial slide is located in the push rod, wherein an actuator/linear actuator is fixed laterally on the cylinder head, the adjusting pin of which is at least indirectly in contact with the end face of the control pin facing away from the engagement end.
Description
Technical Field
The invention relates to a cylinder head module of a variable valve drive of an internal combustion engine, comprising a row of switching valve struts for gas exchange valves with the same loading effect, wherein each switching valve strut is in contact with at least one stroke cam (Hubnocken) of a camshaft and comprises a coupling slide means, the slide means of which protrudes from a side of the switching valve strut, wherein a push rod with an adjusting finger is mounted on the cylinder head parallel to the camshaft, wherein each of the adjusting fingers acts on the slide means of the switching valve strut via a section remote from the push rod, wherein a displacement means for the push rod is used in the cylinder head.
Background
Such a module, also referred to as an electric rocker module or an electric rocker system, is known from DE 102017101792. It is to be noted that the central actuator rod (aktoresiste) with the actuating finger is moved in one direction (the direction of feed or coupling of the coupling slide device into the switching valve lever) by the end-side electric actuator. All the slide elements of the train gas exchange door, which act in the same way, are thus moved or "pretensioned" directly by the force of the actuator to be energized. It is clear that the actuator reaches its limit in the case of high displacement forces (as these are also the case when the number of switching valve struts to be actuated is high), high friction, high return spring force and/or high displacement speeds (high engine speed). The use of stronger or larger actuators makes the onboard electrical system more heavily loaded or limits the use of actuators for installation space reasons or cost reasons.
Disclosure of Invention
The object of the present invention is therefore to provide a cylinder head module (electric rocker module) which can be switched quickly, reliably and with low energy consumption.
According to the invention, the above task is solved by: the displacement means acts indirectly and consists of an axial slide (axialscheebekulise) which is fixed relative to the camshaft and has a feed profile and a return profile for the push rod, wherein a transversely continuous, axially movable control pin with an engagement end for the axial slide is located in the push rod, wherein an actuator, such as a linear actuator, whose adjusting pin is at least indirectly in contact with the end face of the control pin facing away from the engagement end, is fixed on the side of the cylinder head.
The respective slider part of the push rod with the actuating fingers and the switching valve slide is then moved via these actuating fingers finally mechanically by a positive fit of a control pin, which is acted on by an actuator, against one of the profiles of the axial slide. Thus, the displacement energy is taken from the camshaft and not from the actuator/linear actuator. The requirement for at least one actuator/linear actuator per push rod, preferably an electromechanical actuator with at least one adjusting pin or alternatively a hydraulic or pneumatic actuator or the like, is strongly reduced.
Of course, the invention may already be used in single cylinder internal combustion engines having, for example, two intake or exhaust valves that function the same. However, use in multi-cylinder internal combustion engines, such as four-cylinder internal combustion engines, is preferably contemplated. Here, a module for simultaneous loading of valves with the same effect, for example, on two or all cylinders, can be used. In the case of a so-called four-cylinder internal combustion engine, two separate modules for a row of gas exchange valves acting in the same way can therefore also be considered, which also results in a shorter tappet.
Instead of the preferred "transverse locking device", a longitudinal locking device can also be provided on the corresponding switching valve lever with the coupling slide means protruding from the side, provided that the respective direction of rotation is assumed. For this case, a corresponding force deflection device must also be mounted on the module, which adjusts the longitudinal displacement force of the finger.
However, it is particularly preferred if the actuating finger acts on the slider part of the actuating finger in the direction of insertion into the switching valve plunger and is therefore arranged only simply at the end face in front of the slider part. The resetting of the slide element is preferably effected by a return spring in the switching valve lever. Alternatively, the adjusting finger can also act in a "pulling" manner on the coupling slide device or in both axial directions of the coupling slide device.
According to a preferred embodiment of the invention, the axial slide can be a slotted guide (nutkulise) in a channel which is fastened separately to the camshaft, for example. Such a sliding groove is also known from mass-produced sliding cam valve trains (mass audi), and it is not necessary to further describe the sliding cam in this connectionWheel valve mechanisms (see e.g. EP 0789451B 1). In this case, the configurations known from the above-described sliding cam valve drive, such as an X profile, an S profile, a DS profile or an XL profile, can be considered as the feed profile and the reset profile for the axial slide. In addition, the profile for the axial slide according to the invention can also have a radial casting
For example, a purposefully designed height or depth section prevents the control and adjustment pin of the actuator/linear actuator from erroneously extending into the axial slide or forces the control and adjustment pin to retract as a result. Alternatively, the axial slide can also be a one-piece component of the camshaft or can be located on a separate shaft.
A particularly simple construction and arrangement of the push rod is the subject of a further dependent claim. Accordingly, the tappet is to be present as a flat bar, such as a strip (blechtreifen), and to be guided vertically (vertically) in the longitudinal slot of the cylinder head. This upright mounting makes it possible to fix the actuator/linear actuator simply on the front side of the cylinder head. Thus, the actuator/linear actuator, the control pin, the push rod and the camshaft are arranged one after the other in approximately aligned fashion, as seen in the transverse direction of the cylinder head. The cylinder head is thus not unnecessarily large. Alternatively, the tappet can also have a tubular or cylindrical cross section or be present as a polygonal profile.
In a further embodiment of the invention, it is provided that at least one of the mutually adjoining contact end sides of the control pin and the adjusting pin, which contact end sides are configured as contact disks, is distinctly widened, so that the contact of the tappet is given over the entire displacement path of the tappet. In other cases, the control or adjustment pins can also have a correspondingly large uniform diameter (Einheitsdurchmesser), so that there is no need to widen the head region of the control or adjustment pins.
In order to ensure that the control pin is reliably returned in the direction of the actuator and, if appropriate, also to support the insertion of the actuator adjusting pin, the control pin is acted upon by a return spring in the direction of the actuator/linear actuator. In this case, for example, a simple helical compression spring surrounding the control pin can be considered, which is clamped between the actuator rod and the control pin. A corresponding radially protruding profile on the base circle of the axial slide can also cause or support this return movement.
For actuating the slider part of the switching gas gate strut, the push rod has a spring tongue protruding or overhanging therefrom, which spring tongue consists, for example, of a thin-walled spring steel plate. After the switching command is triggered, only the spring tongues of the switching valve strut, which are not currently undergoing a cam base circle rotation, are pretensioned and only in the subsequent base circle rotation do their energy be transferred to the respective slide element.
In a further embodiment of the invention, the purely mechanical holding of the tappet in its two axial end positions is achieved by a latching means, such as a spring-loaded ball lock. The ball lock is also located laterally in the cylinder head, for example. The ball of the ball lock device "slides" as a catch body into the spherical cap shaped formation (Einformung) of the tappet in the final position. Alternatively, the push rod can also be fixed by a bistable latching mechanism not described further, in which a pulse in only one direction is sufficient to eliminate latching in any final position.
The advantageous axial guidance of the control pin with little or no tilting is achieved by the bushing in the push rod recited in the further dependent claims. If necessary, the push rod can itself have a flange-like projection at this point.
Drawings
Fig. 1 shows a spatial view of the cylinder head module from obliquely above.
Fig. 2 shows a cross section through the cylinder head module of the actuator/linear actuator longitudinally centered.
Detailed Description
Fig. 1 shows a cylinder head module 1 of a variable valve train of a four-cylinder internal combustion engine. The module 1 is used to load/deactivate a row of gas exchange doors 3 located therebelow, which are identical in function. Correspondingly, the module can also be used for stroke switching on gas exchange valves, provided that other configurations of the stroke cams (large stroke cam and small stroke cam) and switching valve struts and the like are provided.
Each gas exchange valve 3 (see fig. 2) is assigned a switching valve plunger 2, which is here present as a shut-off lever. In short, each switching valve lever 2 has a box-shaped outer rod 31 which encloses a ratchet-like inner rod 30. The levers 31, 30 are located on a common pivot axis 32 on the valve side, wherein only the central inner lever 30 is acted upon by the travel cam 4 of the camshaft 5.
Each switching valve strut 2 has on its longitudinal side remote from the valve a coupling slide means 6 extending transversely to its longitudinal extension. The coupling slide means here consist of an inner slide, not shown, which is "struck" by a slide piece 7, which projects with one end from the side of the switching valve strut 2. Such a switching valve lever is also called a so-called "transverse locking lever (querverigler)".
In the cylinder head 8, an upright center pushrod 9 made of steel plate is mounted parallel to the camshaft 5. The tappet is guided in a longitudinal slot 22 in a cylinder head plate 23 and protrudes from the camshaft 5. An adjusting finger 10 (see fig. 2) which is present as a leaf spring tongue depends from the push rod 9 at each switching valve lever 2. The section 11 of the respective actuating finger 10 facing away from the tappet 9 is actuated in a telescopic manner via a widened section externally on the associated slide element 7 of the respective switching valve plunger 2.
The longitudinal movement of the push rod 9 is effected by means of an indirectly acting displacement means 12. The displacement means consist on the one hand of an axial slide 13 which is firmly seated on the camshaft 5. In this case, the axial slide is designed as a sliding groove in an X-groove configuration in a component which is solely engaged with the camshaft 5. The section of the axial slide 13 projecting from the left in fig. 1 is in this case designed as a reset profile 14 for the push rod 9 (movement of the push rod 9 to the right), while the section located on the right in this case is designed as a feed profile 15 for the push rod 9 (movement of the push rod 9 to the left).
As a further component of the displacement means 12, a transversely running, axially movable control pin 16 with an engagement end 17 for the axial slide 13 extends in a bore of the ram 9, more precisely in a separate bushing 33. The control pin 16 is surrounded by a return spring 25, which is supported at one end on the push rod 9. The end face 21 of the control pin 16 remote from the push rod is widened in a disk-like manner and is in permanent contact with a "free" end face 24 of the adjusting pin 20 of an actuator 19, which is a further component of the displacement means 12 and is present as an electric actuator. As can also be gathered from fig. 1, the actuator is screwed to a side face 18 of the cylinder head 8.
Furthermore, in order to fix the two axial end positions of the push rod 9, latching means 26 are used. For this purpose, as shown in the left half of fig. 1, a spring-ball locking device is present as a locking means 26 in the cylinder head, whose locking body 27, which is present as a ball, is associated with a spherical cap-shaped and therefore complementary locking indentation 28 in the tappet. In fig. 1, the push rod 9 and therefore the module 1 are shown in the inactive mode, i.e. the push rod 9 is now displaced from the left to the right by the actuator engaging in the reset profile 14 of the axial slide 13 as described above, whereby the actuating finger 10 "releases" its respective slide element 7 and each switching valve strut 2, in the base circle revolution of its travel cam 4, moves into the coupling position and therefore into the active mode of its gas exchange valve. Depending on the configuration of the coupling mechanism, decoupling can also be achieved at the respective switching valve strut 2 when the tappet 9 is displaced to the right as just described.
If the switching valve lever 2 is to be switched back to the stroke of its cam 4, the actuator 19 is energized. The extended adjusting pin (armature pin) of the actuator thereby displaces the control pin 16, which is driven in the push rod 9, axially into the slide groove 13 and onto the feed profile 15. As soon as the axial stroke range of the feed profile begins, the push rod 9 is now displaced positively from the right to the left, whereby each of the cantilevered actuating fingers 10 displaces its slide element 7 in the coupling direction inward as soon as the valve rod 2 is switched, either preloaded or during the cam base circle.
It is obvious that the actuator 19 is correspondingly energized in the form of an activation, but this need not be dealt with in detail here. It is clear, however, that when there is a switching request and the axial travel of the feed or return profiles 14, 15 initially passes the control pin 16 at this point in time, the control pin 16 should ideally project into the axial slide 13. Ideally, when the control pin 16 loaded by the adjusting pin is opposite the profile of the axial slide 13, into which the control pin is not allowed to protrude, the actuator 19 is already energized, so that this profile is now convex. The mechanism (control pin 16) thus has sufficient time to be "preloaded" and then "snap" into the axial slide 13. After this, i.e. at the next camshaft revolution, a switching of the system can be effected.
List of reference numerals
1 Cylinder head Module, Module
2 switching valve pressure lever
3 air exchanging door
4-stroke cam
5 camshaft
6-coupling sliding block device
7 sliding block piece
8 cylinder cover
9 push rod
10 regulating finger
11 section(s)
12-shift device
13 axial slideway
14 reset profile
15 feed profile
16 control pin
17 scarf end
18 side surface
19 linear actuator, actuator
20 adjusting pin
21 end side
22 longitudinal slit
23 Cylinder head fishplate bar
24 end side
25 return spring
26 latch device, spring-ball locking device
27 card lock body
28 latch setback
29 support element
30 inner rod
31 outer rod
32 oscillating shaft
33 bushing
Claims (10)
1. A cylinder head module (1) of a variable valve train of an internal combustion engine, having a row of switching valve struts (2) for charging identically acting gas exchange valves (3), wherein each switching valve strut (2) is in contact with at least one travel cam (4) of a camshaft (5) and has a coupling slide means (6), the slide means (7) of which project from the side of the switching valve strut (2), wherein a push rod (9) having an adjusting finger (10) is mounted on the camshaft (5) in the cylinder head (8) parallel thereto, each of which acts on the slide means (7) of the switching valve strut (2) via a section (11) remote from the push rod, wherein a displacement means (12) for the push rod (9) is used in the cylinder head (8), characterized in that the displacement means (12) acts indirectly and consists of an axial slide (13) which is fixed relative to the camshaft and has a feed profile and a return profile (15,14) for the tappet (9), wherein a transversely running, axially movable control pin (16) having an engagement end (17) for the axial slide (13) is located in the tappet, wherein an actuator/linear actuator (19) whose adjusting pin (20) is at least indirectly in contact with an end face (21) of the control pin (16) facing away from the engagement end (17) is fixed to a side face (18) of the cylinder head (8).
2. Cylinder head module according to claim 1, characterized in that the axial slide (13) is a slide groove in a notch piece protrudingly located on the camshaft (5).
3. Cylinder head module according to claim 1 or 2, characterized in that the axial slideway (13) is a component which solely engages the camshaft (5).
4. The head module according to claim 1, characterized in that said actuator/linear actuator (19) is an electric actuator.
5. Cylinder head module according to claim 1, characterized in that the push rods (9) are in the cylinder head (8) and are laterally parallel to the camshaft (5) and, in the case of a flat strip configuration, are guided upright in longitudinal slots (22) of a cylinder head plate (23).
6. Cylinder head module according to claim 1, characterized in that the mutually opposite end sides (21,24) of the control pin (16) and the adjusting pin (20) are configured (broadly) such that there is an end-to-end contact over the entire longitudinal travel path of the tappet (9).
7. Cylinder head module according to claim 6, in which the control pin (16) is loaded by a return spring (25) in the direction of the actuator/linear actuator (19).
8. Cylinder head module according to claim 1, characterized in that the adjusting finger (10) protruding from the push rod (9) is a separate sheet-like spring tongue.
9. A cylinder head module according to claim 1, characterized in that one or both axial end positions of the push rod (9) are secured by latching means (26), which are spring-ball locking devices located in the cylinder head (8), whose latching bodies (27) present as balls are associated with complementary latching formations (28) in the push rod (9).
10. Cylinder head module according to claim 1, characterized in that the control pin (16) in the push rod (9) is directly axially guided in a bushing (33) located in the push rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910865692.9A CN112483214A (en) | 2019-09-12 | 2019-09-12 | Cylinder head module of variable valve mechanism of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910865692.9A CN112483214A (en) | 2019-09-12 | 2019-09-12 | Cylinder head module of variable valve mechanism of internal combustion engine |
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| Publication Number | Publication Date |
|---|---|
| CN112483214A true CN112483214A (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910865692.9A Pending CN112483214A (en) | 2019-09-12 | 2019-09-12 | Cylinder head module of variable valve mechanism of internal combustion engine |
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| CN (1) | CN112483214A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5874860A (en) * | 1996-02-06 | 1999-02-23 | Motorola, Inc. | High frequency amplifier and control |
| CN103925027A (en) * | 2013-01-11 | 2014-07-16 | 铃木株式会社 | Variable Air Valve Device Of Internal Combustion Engine |
| US20150059677A1 (en) * | 2012-04-27 | 2015-03-05 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Device for a valve train for changing the lift of gas exchange valves of an internal combustion engine |
| DE102017129554A1 (en) * | 2017-12-12 | 2019-06-13 | Schaeffler Technologies AG & Co. KG | Variable valve train of a combustion piston engine |
| DE102017129423A1 (en) * | 2017-12-11 | 2019-06-13 | Schaeffler Technologies AG & Co. KG | Switchable cam follower of a valve train |
| DE102017129420A1 (en) * | 2017-12-11 | 2019-06-13 | Schaeffler Technologies AG & Co. KG | Variable valve train of a combustion piston engine |
| CN110023594A (en) * | 2017-01-31 | 2019-07-16 | 舍弗勒技术股份两合公司 | Variable valve mechanism of piston type internal combustion engine |
-
2019
- 2019-09-12 CN CN201910865692.9A patent/CN112483214A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5874860A (en) * | 1996-02-06 | 1999-02-23 | Motorola, Inc. | High frequency amplifier and control |
| US20150059677A1 (en) * | 2012-04-27 | 2015-03-05 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Device for a valve train for changing the lift of gas exchange valves of an internal combustion engine |
| CN103925027A (en) * | 2013-01-11 | 2014-07-16 | 铃木株式会社 | Variable Air Valve Device Of Internal Combustion Engine |
| CN110023594A (en) * | 2017-01-31 | 2019-07-16 | 舍弗勒技术股份两合公司 | Variable valve mechanism of piston type internal combustion engine |
| DE102017129423A1 (en) * | 2017-12-11 | 2019-06-13 | Schaeffler Technologies AG & Co. KG | Switchable cam follower of a valve train |
| DE102017129420A1 (en) * | 2017-12-11 | 2019-06-13 | Schaeffler Technologies AG & Co. KG | Variable valve train of a combustion piston engine |
| DE102017129554A1 (en) * | 2017-12-12 | 2019-06-13 | Schaeffler Technologies AG & Co. KG | Variable valve train of a combustion piston engine |
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Effective date of registration: 20240322 Address after: 1st Floor, Building 2, No. 1 Antuo Road, Anting Town, Jiading District, Shanghai Applicant after: SCHAEFFLER HOLDING(CHINA) Co.,Ltd. Country or region after: China Address before: German Herzogenaurach Applicant before: SCHAEFFLER TECHNOLOGIES AG & CO.KG Country or region before: Germany |