CN112502806B - Module for a variable lift valve train of an internal combustion engine - Google Patents
Module for a variable lift valve train of an internal combustion engine Download PDFInfo
- Publication number
- CN112502806B CN112502806B CN201910870612.9A CN201910870612A CN112502806B CN 112502806 B CN112502806 B CN 112502806B CN 201910870612 A CN201910870612 A CN 201910870612A CN 112502806 B CN112502806 B CN 112502806B
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- China
- Prior art keywords
- push rod
- module
- base plate
- plate
- guide plate
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 19
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims abstract description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 229910000639 Spring steel Inorganic materials 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention relates to a preassembled module for a variable lift valve train of an internal combustion engine, for installation in a cylinder head of the internal combustion engine, the module having a base plate with at least one projecting guide plate, an electric linear actuator being located upside down on the base plate, and a longitudinally guided push rod having one or two projecting adjusting fingers extending on the push rod, each adjusting finger having a contact surface for displacing a transverse coupling slide of a switchable valve plunger on a section remote from the push rod, wherein a tilting arm is suspended on the underside of the base plate, one side of the tilting arm being in contact with an adjusting pin of the linear actuator passing through the base plate, and the other side of the tilting arm being in contact with the push rod for displacing the push rod in one direction, wherein spring means are mounted on the module for displacing the push rod in the other direction of the push rod, the spring means being clamped at least indirectly between the push rod and the base plate or the guide plate.
Description
Technical Field
The invention relates to a module for a variable lift valve train of an internal combustion engine, comprising a push rod acted upon by an electric linear actuator in one direction, from which push rod an adjusting finger protrudes, each of which has a contact surface for displacing a transverse coupling slider of a switchable valve plunger on a section remote from the push rod, wherein spring means for displacing the push rod in the other direction are mounted on the module.
Background
Such a module with an actuator-loaded push rod and an adjusting finger on the push rod is also referred to as an electrical rocker module. An example of this is known from DE 10 2017 101 792. An exhaust valve train of a three-cylinder internal combustion engine is associated with a common pushrod in the cylinder head, which pushrod has an electric actuator arranged on the end face. Each cylinder is provided with two ventilation doors with the same function. The push rod is returned when the actuator is not energized by the force of a pressure spring arranged in the vicinity of the actuator.
The components of the aforementioned "long" module have to be assembled with great effort on the cylinder head and are arranged specifically for the respective type of internal combustion engine. For this purpose, the cylinder head has a slot for guiding the push rod in the section of the camshaft bearing, through which a long, fragile and difficult-to-handle push rod must be guided in the assembled condition; the adjusting finger is mounted on the push rod in a subsequent assembly. In this case, the electric actuator is positioned behind the push rod in an aligned manner and unnecessarily increases the installation space of the internal combustion engine, and furthermore the electric actuator must be fixed separately.
It was also ascertained that the actuation of a row of gas exchange valves simultaneously requires a high current and that only short time windows can be operated in this case. In addition, a stronger return spring device must be installed. It is fully clear that internal combustion engines having a cylinder number greater than 3 are also contemplated.
Disclosure of Invention
The object of the invention is therefore to create a module which is easy to construct and which can be assembled and which can be used in a variety of ways.
According to the invention, this object is achieved by the novel features of claim 1.
Thus, a module is proposed which is preassembled "on the outside" for installation into the cylinder head of an internal combustion engine. The module has a base plate with at least one protruding guide plate on which the electric linear actuator is located upside down, wherein on the wall of the guide plate a push rod guided along it is provided with one or two protruding adjusting fingers, which extend over the push rod. On the underside of the base plate there is suspended a flip arm (Kipparm) one side of which is in contact with an adjustment pin of the linear actuator passing through the base plate and the other side of which is in contact with a push rod for displacing the push rod in one direction. Spring means are mounted on the module for displacing the push rod in the other direction thereof and are clamped at least indirectly between the push rod and the base plate or guide plate.
Thus, a module is proposed which does not have the aforementioned drawbacks. The module for actuating one or two (three are also conceivable) switching struts (exhaust or intake tract) of only one cylinder of an internal combustion engine, which now has a short structure, can be supplied to the internal combustion engine completely externally preassembled and can be assembled there "from above" automatically or manually. The transportation and handling of the module becomes simpler. Those skilled in the art recognize that the module may now be used widely in a wide range of internal combustion engine types. Only partial assembly of the cylinder head with the module is also provided herein. It is furthermore clear that the individual modules only need less energy if the switching time window is sufficiently large.
According to a preferred development of the invention, the base plate of the protruding guide plate, which carries the functional elements of the module, is composed of thin-walled steel sheet and is produced by press bending technology. The base plate should be, for example, formed by two simple longitudinal strips, to the center of which the actuator is fastened in an upright manner. For fastening the base plate to the cylinder head, the longitudinal webs have, for example, holes at their ends. The webs can thus be screwed to suitable contact points of the cylinder head, for example camshaft bushes, parallel to the longitudinal wall of the camshaft or the internal combustion engine.
Furthermore, it is proposed that the holding plate is arranged parallel to the guide plate of the base plate, and that the holding plate also protrudes from the base plate in one piece. A simple solution for fixing the shaft for the tilting arm, which is embodied as a pin, is thus achieved. Alternatively, the invert arm may also be supported on two buttonholes suspended from the base plateThe support is either on the/tab or on one side only.
Preferably, the flexible adjusting finger, which consists of spring steel, should be present as a separate member to be engaged with the push rod. It is considered that the adjusting fingers pass through bends embodied on the adjusting fingersOr similar structure simply suspended from the pushrod. However, it is also conceivable and possible to provide for the adjusting finger to be embodied as a one-piece component of the push rod if necessary.
By means of a tab which stands up in one piece from the push rod as proposed, a simple contact point for the tilting arm on the push rod is given, with which a side of the tilting arm remote from the actuator is in contact. The tab can be easily constructed from the push rod. Alternatively, separate contacts, such as bolts, pins, brake blocks or the like, are also conceivable.
The "internal" guidance of the pushrod on the module is the subject of another dependent claim. The retaining plate is thus located on the wall of the guide plate. The push rod is guided longitudinally in the gap between these components. The two plates can be connected to each other, for example, by means of pins, on which plates the push rod is guided by means of elongated holes.
In this case, it is also provided that the reset means for the plunger are integrated in the module. For this purpose, according to a variant of the invention, an arm is raised from the holding plate, between which arm and the bow of the push rod the helical compression spring or the helical compression spring stack is clamped. Alternatively, an electromagnetic or other resetting can also be performed by the servo device.
The respective actuating finger has a curled geometry and is therefore flexibly guided in a narrow cylinder head region toward the respective switching valve lever.
Drawings
FIG. 1 shows a front perspective view of a module;
FIG. 2 shows the module installed into a cylinder head; and
Fig. 3 shows a side view of the module.
Detailed Description
A module 1 with a short construction for a variable lift valve train of an internal combustion engine is shown in the drawing. The module 1 is supplied to the cylinder head 6 of the internal combustion engine and screwed there in such a way that all the components, which will be described further below, are preassembled on the module 1.
The module 1 has a base plate 2 made of steel plate, and a guide plate 3 is bent downward from the base plate 2. The base plate 2 finally consists of two webs extending in a wing-like manner relative to one another (see in particular fig. 2), on the ends 19, 20 of which webs in each case one junction 21, 22 is provided in the form of a hole. The module 1 is firmly screwed to a support region 24 located near a camshaft bushing 23 of the cylinder head 6 via the joints 21, 22. The module 1 thus extends parallel to the longitudinal extension of the cylinder head 6.
As can be seen from fig. 1 and 2, an electric linear actuator 4 which is inverted centrally on the guide plate 3, which protrudes with its adjusting pin 16 through the base plate 2, belongs to the module 1.
On the aforementioned guide plate 3 of the base plate 2, a push rod 7 made of a steel plate is guided along the longitudinal direction of the cylinder head 6. The push rod 7 has a plate-like geometry in principle. Two adjusting fingers 8 made of spring steel spaced apart from each other are suspended into the push rod 7. These adjusting fingers extend over the outer wall of the push rod 7 and are located via a bend 29 in a recess 27 in the upper longitudinal side 28 of the push rod 7.
As can be seen from fig. 1, the respective adjusting finger 8 transitions underneath the push rod 7 into a first extension 38 bent parallel to the latter, from which a hook-type end piece 39 (section 9 remote from the push rod) is bent upwards, which has a contact surface 10 for the transverse coupling slide 11 of the switchable valve lever 12. The module 1 with a short structure is therefore associated with only two identically acting gas exchange valves of one cylinder of the internal combustion engine.
On the underside 13 of the base plate 2, an angle-structured tilting arm 14 made of steel plate is suspended (see fig. 1, 3). For this purpose, the holding plate 25 is opposed parallel to the guide plate 3 of the base plate 2. The plates 2, 25 are bridged by pins 26, which are fastened therein and on which the tilting arms 14 are supported. As best shown in fig. 3, an upper edge 15 of the tilting arm 14 is contacted by an adjustment pin 16 of the linear actuator 4. The other edge 17 of the tilting arm 14 acts on a web 30 of the push rod 7 for displacing the push rod in one direction (in this case the "coupling direction" from right to left).
For example, at the beginning of a predetermined coupling time window for the lateral coupling slide 11 of the two valve struts 12, the actuator 4 is energized, which causes its actuating pin 16 to protrude downward, as a result of which the tilting arm 14 is rotated in a clockwise direction in a stepwise manner (SEGMENTWEISE). As a result, the push rod 7 is displaced to the left with its suspended adjusting finger 8 and the adjusting finger 8 is displaced (on the premise of a cam-based circumferential rotation) by the transverse coupling slide 11 of the valve lever 12, as a result of which, depending on the configuration, the coupling or decoupling of the two lever parts of the valve lever 12 is achieved, which is not necessary in this regard in detail.
The above-described translational guiding of the push rod 7 on the module 1 takes place more precisely in the gap between the guide plate 3 and the holding plate 32, which is firmly connected to the guide plate 3 and also consists of steel plates. The push rod 7 has an elongated hole 36, visible in fig. 2, in which at least one pin 37 connecting the guide and retaining plates 3, 32 moves.
An arm 33 projects upwardly from the holding plate 32, said arm being opposite an arcuate piece 35 which also rises upwardly from an end 34 of the push rod 7 remote from the tilting arm (see fig. 3). In the middle, when the electric linear actuator 4 is not energized or is energized little, the spring element 18, which is designed as a helical compression spring, is clamped as a module component for resetting the plunger 7.
It is clear that, due to the spring action of the adjusting fingers 8, these can "pretension" the corresponding transverse coupling slide 11 in the valve lever 12 outside or before the cam base circle rotation in the event of a desired displacement, wherein this then takes place "abruptly" into the valve lever 12 at the beginning of the base circle.
List of reference numerals
1) Module
2) Substrate board
3) Guide plate and plate
4) Electric linear actuator and actuator
5) Wall with a wall body
6) Cylinder cover
7) Push rod
8) Adjusting finger
9) Segment(s)
10 A) contact surface
11 Transverse coupling slide block)
12 Valve lever)
13 A) underside of
14 Turnover arm)
15 One edge
16 Adjusting pin)
17 With one side
18 Spring device)
19 End portion)
20 End portion)
21 A junction point)
22 A junction point)
23 Bearing bush of camshaft
24 Area)
25 Holding plate, plate
26 Pin)
27 Concave portion)
28 Longitudinal side
29 Elbow(s)
30 Tab(s)
31 Support element)
32 Holding plate)
33 Arm)
34 End portion)
35 Arch piece
36 Long hole)
37 Pin)
38 Extension portion)
39 A tip.
Claims (7)
1. A pre-assembled module (1) for a lift-variable valve mechanism of an internal combustion engine, for installation into a cylinder head (6) of the internal combustion engine, the module (1) having a base plate (2) with at least one protruding guide plate (3), an electric linear actuator (4) being located upside down on the base plate (2), and, on a wall (5) of the guide plate (3), a push rod (7) guided along the wall (5) with one or two protruding adjusting fingers (8) extending over the push rod, each of the adjusting fingers (8) having a contact surface (10) for displacing a transverse coupling slider (11) of a switchable valve lever (12) on a section (9) remote from the push rod, wherein on a lower side (13) of the base plate (2) a tilting arm (14) is suspended, one edge (15) of the tilting arm being in contact with a tilting pin (16) of the linear actuator (4) passing through the base plate (2) and the other edge (17) being in contact with the push rod (7) in the direction, wherein the other adjusting finger (7) is displaced in the direction towards the push rod (1) and wherein the other adjusting finger (8) is displaced in the direction towards the push rod (7), the push rod (7) is guided in a translationally movable manner in a gap between a wall (5) of the guide plate (3) and a first holding plate (32) connected to the guide plate (3), wherein an arm (33) protrudes from the first holding plate (32), a bow (35) protruding from an end (34) of the push rod (7) remote from the tilting arm is opposite the protruding arm (33) of the first holding plate (32), wherein a spring element (18) embodied as at least one helical compression spring is clamped between the protruding arm (33) of the first holding plate (32) and the bow (35) for resetting the push rod (7).
2. Module according to claim 1, wherein the base plate (2) and the guide plate (3) are one-piece sheet metal stamping bends, wherein the base plate (2) consists of two strips extending relative to each other, the electric linear actuator (4) being located at the contact center of the strips, wherein joints (21, 22) are provided on the free ends (19, 20) of the strips for connecting the module (1) with a camshaft bushing (23) or with a region (24) of the cylinder head (6) close to the camshaft bushing.
3. A module according to claim 1, wherein a second retaining plate (25) opposed parallel to the guide plate (3) protrudes from the base plate (2), and the guide plate (3) and the second retaining plate (25) are bridged by a first pin (26) fixed therein, on which the flipping arm (14) is supported.
4. Module according to claim 1, wherein the respective adjusting finger (8) is a one-piece or multipart component of the push rod (7), wherein, in the case of a multipart construction of the adjusting finger, the adjusting finger is guided upward on one of the walls of the push rod (7) and is located via a bend (29) in a recess (27) of an upper longitudinal side (28) of the push rod.
5. A module according to claim 1, wherein a tab (30) is upstanding from the push rod (7), said tab being contacted by the other edge of the invert arm (14) for displacing the push rod (7) in a manner loaded by an actuator.
6. The module according to claim 5, wherein the push rod (7) has an elongated hole (36) in which at least one second pin (37) connecting the guide plate (3) and the first retaining plate (32) moves.
7. Module according to claim 1 or 4, wherein each adjusting finger (8) consists of spring steel and transitions underneath the push rod (7) into a first extension (38) bent parallel to the push rod, from which a hook-shaped end piece (39) with a contact surface (10) is bent upwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870612.9A CN112502806B (en) | 2019-09-16 | 2019-09-16 | Module for a variable lift valve train of an internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870612.9A CN112502806B (en) | 2019-09-16 | 2019-09-16 | Module for a variable lift valve train of an internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112502806A CN112502806A (en) | 2021-03-16 |
| CN112502806B true CN112502806B (en) | 2024-08-30 |
Family
ID=74923616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910870612.9A Active CN112502806B (en) | 2019-09-16 | 2019-09-16 | Module for a variable lift valve train of an internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112502806B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5690066A (en) * | 1996-09-30 | 1997-11-25 | Eaton Corporation | Engine valve control actuator with knee action linkage |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373170A (en) * | 2014-09-11 | 2015-02-25 | 绵阳富临精工机械股份有限公司 | Valve stroke control compression bar |
| JP6669591B2 (en) * | 2016-05-31 | 2020-03-18 | 本田技研工業株式会社 | Variable valve train for internal combustion engines |
| DE102017126703A1 (en) * | 2017-11-14 | 2019-05-16 | Schaeffler Technologies AG & Co. KG | Switchable valve train element of a valve train 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 |
| DE102017130277A1 (en) * | 2017-12-18 | 2019-06-19 | Schaeffler Technologies AG & Co. KG | Switchable cam follower of a valve train |
-
2019
- 2019-09-16 CN CN201910870612.9A patent/CN112502806B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5690066A (en) * | 1996-09-30 | 1997-11-25 | Eaton Corporation | Engine valve control actuator with knee action linkage |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112502806A (en) | 2021-03-16 |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
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 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |