CN110131007A - Switchable cam follower for a valve train of an internal combustion engine - Google Patents
Switchable cam follower for a valve train of an internal combustion engine Download PDFInfo
- Publication number
- CN110131007A CN110131007A CN201910084536.9A CN201910084536A CN110131007A CN 110131007 A CN110131007 A CN 110131007A CN 201910084536 A CN201910084536 A CN 201910084536A CN 110131007 A CN110131007 A CN 110131007A
- Authority
- CN
- China
- Prior art keywords
- rocker arm
- cam follower
- locking piston
- locking
- control shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 16
- 230000033001 locomotion Effects 0.000 claims abstract description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 230000002000 scavenging effect Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims 1
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 206010015535 Euphoric mood Diseases 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000004323 axial length Effects 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
- 230000007423 decrease Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 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
- F01L13/0005—Deactivating valves
-
- 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
- F01L1/185—Overhead end-pivot rocking arms
-
- 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
- F01L13/0021—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 by modification of rocker arm ratio
-
- 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
-
- 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
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
- F01L2001/467—Lost motion springs
-
- 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
- F01L2013/10—Auxiliary actuators for variable valve timing
- F01L2013/101—Electromagnets
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
-
- 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
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/03—Stopping; Stalling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
A switchable cam follower of an internal combustion engine valve train, comprising an outer rocker arm with two arms, between which an inner rocker arm is mounted which is pivotally movable relative to the outer rocker arm by means of a pivot shaft, at least the inner rocker arm having a cam running surface on its upper side; the cam follower has on its one end on its underside an abutment surface which cooperates with the gas exchange valve and on its other end a contact surface for the support element. The cam follower is further provided with a pot-shaped housing opposite the pivot axis on the outer rocker arm, wherein a spring-loaded locking piston is supported in a manner movable substantially perpendicular to the pivot axis, which in an unlocking position separates the inner rocker arm in terms of movement from the outer rocker arm and in a locking position connects them; the cam follower is also provided with an operating mechanism for moving the locking piston. The actuating mechanism comprises an electrically operated actuator and a control shaft which is arranged parallel to the pivot axis on the pot-shaped housing and moves the locking piston into the locking or unlocking position.
Description
Technical field
The present invention relates to the cam follower that can switch, the especially pendulum-type rocker arm of a kind of engine valve transmission facility,
The cam follower has band there are two the outer rocker arm of arm, be supported between the two arms can by pivotal axis relatively this outer shake
The inner rocker arm that arm moves pivotally, wherein at least the inner rocker arm has the convex of at least one cam for camshaft on it
The running face of wheel, and the cam follower has the abutment face to cooperate with scavenging air valve on the downside of it on one end, and at it
Have on the other end and be used to support the contact surface of element, in addition, the cam follower have on outer rocker arm with pivotal axis phase
Opposed tank shape shell, spring-loaded locking piston are supported on the tank shape in a manner of it can substantially move perpendicular to pivotal axis
In shell, and the locking piston unlock station in make inner rocker arm in movement in terms of with outer rocker arm separate and lock station in
It connect inner rocker arm with outer rocker arm, and the cam follower is additionally provided with operating mechanism for mobile locking piston.
Background technique
In general, moving seesaw-type rocker arm, pendulum-type rocker arm or cup shell are used as cam driven in piston reciprocating internal combustion engine
Part, for manipulating scavenging air valve, the scavenging air valve is in the case where camshaft is located above directly by the respective of same camshaft
Cam control.Using simple moving seesaw-type rocker arm, pendulum-type rocker arm or cup shell, the lift for the valve being controlled by it cannot be by shadow
It rings.
In order to save fuel and improve the efficiency of internal combustion engine, just have been known for a long time using the cam that can switch from
Moving part.These cam followers be used to influence the lift of scavenging air valve in internal combustion engine.In the simplest case, it is so-called to realize
Zero lift, that is to say, that even if the cam of camshaft of rotation manipulates cam follower, the scavenging air valve attached
It does not open.According to the design scheme of the cam for the cam follower and camshaft that can switch, it is also able to achieve valve stroke and valve
The change of lift variation curve.
From use 10 2,007 029 465 A1 of DE also known generic, can switching, being made of outer rocker arm and inner rocker arm
In the pendulum-type rocker arm of engine valve transmission facility.In this case, there are two arms for outer rocker arm tool.Inner rocker arm is arranged in these
Between arm.Cam running face is respectively arranged on the upside of two rocker arms.On the downside of pendulum-type rocker arm, it is arranged an end
There is the abutment face of the scavenging air valve for internal combustion engine.It is opposed to be configured with contact surface with the abutment face, support component acts on this and connects
In contacting surface.Two rocker arms are connected with each other in side by common pivotal axis.Spring is installed on the pivotal axis, which will
Inner rocker arm is pressed into its top positioning.In addition, outer rocker arm has cylinder sandwich type element at its other end, in the cylinder sandwich type element
The locking piston of guide springs load in a sliding manner.The locking piston can locking station in by inner rocker arm in movement side
Face is connect with outer rocker arm, that is to say, that when the cam of camshaft is pressed on inner rocker arm, then turning on scavenging air valve.It is unlocking
In station, inner rocker arm is separated in terms of movement with outer rocker arm.Inner rocker arm cannot manipulate the ventilation sticked on outer rocker arm as a result,
Valve.Certainly, according to the design scheme of cam, face can also be operated by the cam being mounted on outer rocker arm to realize scavenging air valve
Open movement.
In this design scheme it is a disadvantage that locking piston is activated by the oil pressure in internal combustion engine.In the high feelings of oil pressure
Under condition, locking piston switches, and in the case where oil pressure decline, locks the spring of piston and is moved to the locking piston separately
In one position.During piston is locked in activation, oil pressure necessarily is in constant.This requires the pump power ratio of oil pressure pump that can not cut
Setting is higher for the pump power of valve train facility in the case where the pendulum-type rocker arm changed.Due to other in oily circulation loop
Customer, it may occur that strong abrupt pressure reduction, this leads to the undesirable switching to locking piston.Exist for internal combustion engine
In the case where start-stop automatic control device, switching state cannot store before shutdown.On startup, locking is lived
Plug is in it always and unlocks in station.
From known in 2016/197088 A1 of WO: in the case where the cam follower that can switch, substituting to locking piston
Hydraulic operation, is provided with the actuator of coil form to work with electromagnetic mode, which resists compression bullet in the energized state
The pressure of spring will lock piston and be maintained in its unlock station.In the currentless situation of coil, compressed spring will lock piston
It is moved in locking station.The arrangement is constructed so that a part of locking piston directly cooperates with coil.Therefore, as long as
Locking piston should be maintained at it and unlock in station, which just needs to be powered to coil.
Summary of the invention
The task of the present invention is: it avoids described disadvantage and proposes a kind of cam follower for that can switch, especially
It is the operating mechanism of pendulum-type rocker arm, the operating mechanism is in terms of switching position independent of to the maintenance of oil pressure/steering force.
The task is solved by the feature of the characteristic of independent claims 1.Advantageous design scheme is being subordinated to
It is provided in the claim of the independent claims, these claims can be separately or each other with different combinations
The solution of the present invention is presented.
Then, starting point of the invention is the cam follower that can switch of engine valve transmission facility, especially puts
Formula rocker arm.Cam follower has band there are two the outer rocker arm of arm, and being supported between the two arms can be opposite by pivotal axis
In the inner rocker arm that outer rocker arm moves pivotally.At least inner rocker arm have on it the camshaft for internal combustion engine at least one is convex
The cam of wheel operates face.Cam follower has abutment face on the downside of it on one end, and has on its other end
Contact surface.The scavenging air valve of internal combustion engine cooperates with abutment face, and is provided with support component on the contact surface.In addition, cam follower
There is the tank shape shell opposite with pivotal axis on its outer rocker arm, spring-loaded locking piston is with substantially can be perpendicular to pivot
The mobile mode of shaft is supported in the tank shape shell, and the locking piston makes inner rocker arm and outer rocker arm exist in unlocked position
Movement aspect separates and connect inner rocker arm with outer rocker arm in the position that can be locked.It is used in addition, being additionally provided with operating mechanism
Make to lock piston movement.
According to present invention provide that: operating mechanism includes the actuator to be worked in a manner of electric and control shaft, wherein control shaft
It with pivoting axis parallel is supported on tank shape shell and makes to lock piston motion into locking station or unlock station.
By arrangement according to the invention, the operating mechanism of structure very little to work in a manner of electric can be createed,
Wherein, small structure change is only needed on existing cam follower, but does not increase the knot of these cam followers
Conformational space.This necessary to two for making inner rocker arm always remain at the reset spring on its extreme higher position in the unlocked state
It is more applicable in for (idle running torsional spring), is advantageously able to be coaxially arranged around the shell of control shaft.For the present invention, in order to
Reach the two stations, can screw or move control shaft.Thus, it is only necessary to small adjusting stroke.
Electromagnet can be set as the actuator to work in a manner of electric.It can be equally it is envisaged that using electricity
Machine, its may have additional transmission device.Using have multiple cylinders and/or lift valve so that it is multiple can switching cams from
In the case where the internal combustion engine of moving part, each actuator can targetedly be manipulated by the actuator to work in a manner of electric, used
In the common initial orientation for reaching all cam followers that can switch.
It is moved in two position to make to lock piston, control shaft can be equipped with the controlling curve of closure, the closure
Controlling curve ensure locking piston reach its lock and unlock position.For this purpose, controlling curve can be in the circle of control shaft
It is distributed on week, so that the two positions of locking piston can be reached by screwing control shaft.For this purpose, controlling curve itself can be with class
It changes in terms of its depth with being similar to the cam of camshaft.
It is simpler in structure to be: to generate control by changing its diameter in a part of the axial length of control shaft
Curve, wherein the controlling curve has the region that diameter is smaller and is relatively large in diameter, i.e. minimum portion and maximum portion.Here, control is bent
The minimum portion and maximum portion of line are sized so that the axial movement by control shaft, and locking piston can arrive separately at it
One of position in two positions.
In order to prevent control shaft from screwing around its longitudinal axis in this case, piston is locked in its leaning on towards controlling curve
There is the flank with sliding surface, wherein the flank corresponds to the width of controlling curve in terms of its length at preceding region.
In order to not needed in two stations of locking piston through retentivity caused by the actuator that is worked in a manner of electric,
It is proposed in improvement project of the invention: being provided with locking system at the minimum portion and maximum portion of lifting curve, locking dress
It sets and locking piston is maintained at the position.Also ensure whereby: in starting internal combustion engines, thus cam follower controls in turn
Lift valve the station that always there is it to occupy when off.
The locking system of simple structure has each lock slots at the minimum portion and maximum portion of controlling curve, locking
The end for facing controlling curve of piston can be locked into lock slots by the power of its spring.Then, it is worked in a manner of electric
Actuator must be designed to the mobile control of power for the spring for enabling the actuator to work in a manner of electric to resist locking piston
Axis.
Due to its structure size, electric loop coil has been proved to be advantageous as the actuator to work in a manner of electric
's.In this case significantly: being provided at the corresponding minimum portion and maximum portion of controlling curve above-mentioned
Locking system.Loop coil can keep nothing when as a result, in the locking or unlock station that control shaft is maintained to locking piston
Electric current.
Alternative is in this, however, it is possible to be provided with the loop coil of the electricity of the magnet in the center there is round bar shape.
The magnet is used for: being held in its position control shaft when loop coil no current.It is possible thereby to save individual locking dress
It sets.Permanent magnet or electromagnet can be used as magnet.Permanent magnet has the advantages that it does not need energy and controls to keep
Axis.
Advantageously: being both provided with the actuator to work in a manner of electric in each end of control shaft.Certainly, work as control shaft
When being maintained in minimum portion or maximum portion by other mechanisms, such as compressed spring, an actuator can also be only set.It connects
, the actuator that the actuator to be worked in a manner of electric must be designed to that this is worked in a manner of electric resists compressed spring
Power by control shaft adjust into another location.
In order to support the magnetic force applied by the actuator to work in a manner of electric, it is advantageous that control shaft is in two end side
It is respectively provided with compressed spring.Small in order to which structure space to be kept as, the spring end of compressed spring is around respective in a manner of electric
The actuator of work.
Leaf spring has been proved to be a kind of space-saving solution, the leaf spring for the spring for locking piston
It is arranged perpendicular to the movement routine for locking piston.In this case, on the one hand which is supported on the convex shoulder of locking piston
Above on the other hand it is supported on tank shape shell.Ensure that by the spring: locking piston always sticks on the control of control shaft
On curve and the controlling curve can be followed.
It is meaningful that the actuator to work in a manner of electric is manipulated by the engine control section of affiliated internal combustion engine.
The present invention is not limited to the features that the sum of independent claims 1 is subordinated to the claim of the independent claims 1
Illustrated combination.In addition, especially obtain in the description to embodiment when each feature from claims, then or
When directly obtaining from attached drawing, the other possibilities for being combined each feature each other are obtained.In addition, claims pass through
The protection scope of claims, using appended drawing reference, shown implementation should be never restricted to to the reference that attached drawing carries out
Example.
Detailed description of the invention
In order to the present invention is further explained and refering to attached drawing, multiple embodiments are simplifiedly shown in the drawing.Its
In:
Fig. 1 shows the perspective view for the pendulum-type rocker arm that can switch；
Fig. 2 shows the vertical section of the pendulum-type rocker arm according to Fig. 1 as side view, which has according to the present invention
The locking piston and control shaft in unlocked position；
Fig. 3 a shows the cross section of the pendulum-type rocker arm according to Fig. 2 as overlooking, which has in control shaft
Two ends each one electric coil as the actuator to be worked in a manner of electric and the locking piston in unlocked position；
Fig. 3 b shows the perspective view of the pendulum-type rocker arm with coil and compressed spring according to Fig. 3 a, wherein tank shape shell
Body is shown with section；
Fig. 4 a shows the top view of pendulum-type rocker arm as Fig. 3 a, wherein locking piston and control shaft are in locking work
Position；
Fig. 4 b shows the perspective view of pendulum-type rocker arm as Fig. 3 b, wherein locking piston and control shaft are in locking work
Position；
Fig. 5 a shows the schematic diagram of the first embodiment of the lifting curve in control shaft；
Figure 5b shows that the schematic diagrames of the second embodiment of the lifting curve in control shaft.
Specific embodiment
Fig. 1 shows the pendulum-type rocker arm 1 that can switch as the cam follower for internal combustion engine using solid.The pendulum-type
Rocker arm has outer rocker arm 2, and the middle section of the outer rocker arm is extended to two arms 3.Between these arms 3, inner rocker arm 4 is with energy phase
The mode of outer rocker arm swinging motion is extended.Inner rocker arm has idler wheel 6 at section 5 therebetween, as not into one
The running face of the same cam not shown further of camshaft shown in step.According to the design scheme of camshaft, may also set up
When inner rocker arm 4 and outer rocker arm 2 unlock, the cam that face cooperates is operated with the cam on one or two arm 3 of outer rocker arm 2.
Inner rocker arm 4 has crossbeam 16 in end, and with box-like the open centre portion 5 of the crossbeam couples, the middle area
Section passes through two rod-shaped 17 bounds of arm.Arm 17 is consumingly transited into complications towards the end 15 opposed with crossbeam towards each other
Contact pin 7, the contact pin nearly orthogonal is in longitudinal mid-plane of pendulum-type rocker arm 1.In the end regions, pivotal axis 10 is arranged in
In outer rocker arm 2, which also runs across inner rocker arm 4, so that inner rocker arm 4 is connect in a manner of energy rotation with outer rocker arm 2.It shakes outside
The downside 8 of arm 2 is provided with the abutment face 9 (Fig. 2) of the same unshowned scavenging air valve for internal combustion engine on the end 15.Outside
Rocker arm 2 surrounds inner rocker arm 4 as much as possible, so that forming very compact pendulum-type rocker arm 1.Therefore the pendulum-type rocker arm also has
Small rotary inertia.
At the end 18 adjacent to crossbeam 16, outer rocker arm 2 is equipped with tank shape shell 13, is disposed with and connects in the tank shape shell
Get off the locking piston 20 and its operating mechanism 19 being further described.Tank shape shell 13 the end on the downside of it 8 have be directed to
The contact surface 14 (Fig. 2) of the dome type construction of support component not shown further.
The bolt 11 of cylinder formula is separately installed in a manner of protruding at right angle on the opposite outside of tank shape shell 13, this
A little bolts are surrounded by each torsionspring 12.Torsionspring 12 (also referred to as idle running spring) is supported on outer rocker arm 2 simultaneously in side
It is supported on inner rocker arm 4 in the other side.Thereby ensure that: when inner rocker arm is not by cam control, inner rocker arm 4 is together with its idler wheel 6
Always it is in its top termination station.
It, can be it is further seen that locking a part of piston 20 and operating mechanism 19 in view according to fig. 2.Here, lock
Tight piston 20 is in its unlocked position, that is to say, that inner rocker arm 4 is not connect with outer rocker arm 2 herein.It is axial with energy to lock piston 20
The mode of movement is supported in the hole 21 in tank shape shell 13.The locking piston has band sliding surface 23 at forward region 22
Flank.In the end for deviating from sliding surface 23, locking piston 20 has step-like convex shoulder 24.Piece is disposed on convex shoulder 24
Spring 25, the leaf spring make locking piston 20 be maintained at its unlocked position.Meanwhile leaf spring 25 is for making to lock piston always with its sliding
Face 23 is kept in contact with control shaft 27, as illustrated in next Fig. 3 and 4.Leaf spring 25 is longitudinally extended vertical with it
In the direction of travel of locking piston 20.Convex shoulder 24 is further arranged such that when the mobile convex shoulder in the direction axially towards crossbeam 16, convex
Shoulder can rabbet the downside of crossbeam 16 from below.When idler wheel 6 is not by cam control, this is always possible, because of torsionspring
Next 12 will make inner rocker arm be in its highest station, so that crossbeam 16 can be rabbeted from below by locking the convex shoulder 24 of piston.
The sliding surface 23 of locking piston 20 abuts linearly on controlling curve 26, which processes in control shaft 27
Circumference in.Control shaft 27 is cylindrically constructed and is supported in two bolts 11, as being next further described.
The total of operating mechanism 19 can be seen in the top view for the cross section of Fig. 3 a, which has
Next control shaft 27 with controlling curve 26 and the actuator to be worked in a manner of electric, the actuator will be also described by.Control
Axis 27 processed is supported in two bolts 11, the two bolts construct the free end in tank shape shell 13 in a manner of laterally horizontal protrusion
On.Around the periphery of these bolts 11 arrangement there are two torsionspring 12, these torsionsprings make the inner rocker arm 4 without manipulation begin
It is in its extreme higher position eventually.Here, it also seen that the fulcrum post of idler wheel 6, the fulcrum post are arranged only in inner rocker arm 4, to ensure
Swinging motion under the unlock station of locking piston 20.Idler wheel 6 is not shown for good general view.
As can be seen particularly well here, it is machined at the circumference of control shaft 27 along the extension of its axial direction
Controlling curve 26.The controlling curve has minimum portion 28 and maximum portion 29, wherein the diameter of control shaft 27 at minimum portion 28 most
Overall diameter small and that control shaft is corresponding approximately at maximum portion 29.
Two ends of control shaft 27 are respectively disposed with an electric loop coil 30,30' is used as and is worked in a manner of electric
Actuator.Magnet 31, the 31' of round bar shape are in the inside of each loop coil, and the magnet of the round bar shape is preferably configured as
Permanent magnet.In each bolt 11, the two is kept by plug 32, the 32' of annular, the plug of the annular also and meanwhile to bolt 11 into
Row closing.Respectively have a compressed spring 33,33' on the end side for facing loop coil that side is supported on control shaft 27 and in
The other side is supported on plug 32, on 32'.In order to save structure space, compressed spring 33 is concentrically surrounding loop coil 30 and magnetic
Body 31, and compressed spring 33' surrounds loop coil 30' and magnet 31'.In this embodiment, control shaft 27 and its loop coil
30 and 30' and magnet 31 and 31' and compressed spring 33 and 33' constitute operating mechanism 19.
The de- position of locking piston 20 is shown in fig. 3 a.It can take up the station, rib to lock piston 20
Portion must at its sliding surface 23 at the minimum portion 28 of controlling curve 26.This means that: the free end of one of control shaft 27
Side sticks on magnet 31'.Then, compressed spring 33' is consumingly pressed together, and compressed spring 33 has its maximum length.
Due to magnet 31', coil 30' can keep no current.
In fig. 3 a, moreover it is possible to see the orientation and arrangement of leaf spring 25.The leaf spring with being configured to w shape curved leaf spring, the piece
The middle section 34 of spring is supported on step-like convex shoulder 24.Two free end is supported on tank shape shell by means of retainer 35
Opposed opening in body 13.
Fig. 3 b again illustrates control shaft 27 in the arrangement in two bolts 11 or locks piston 20 in tank shape shell 13
The orientation in orientation and leaf spring 25.Identical component is equipped with identical appended drawing reference, wherein is not institute for better general view
There is component to be designed with appended drawing reference.Here, particularly obviously see: step-like convex shoulder 24 not in the lower side-lower of crossbeam 16,
That is, locking piston 20 is in its unlocked position.
Show in figs 4 a and 4b in Fig. 3 a and 3b identical view, only difference is that: inner rocker arm 4 here
It is coupled with outer rocker arm 2 by locking piston 20, that is to say, that the convex shoulder 24 of locking piston 20 rabbets the cross of inner rocker arm 4 from below
Beam 16.Here, identical component also is provided with identical appended drawing reference.
In order to reach locked position, the power that lockup piston 20 must resist its leaf spring 25 is mobile.This can be in the following way
To realize: control shaft 27 is moved to its another termination station relative to its station shown in Fig. 3 a and 3b.It slides as a result,
Dynamic face 23 moves to maximum portion 29 along controlling curve 26.The movement of control shaft 27 is achieved in that by ring
Apply voltage on shape coil 30' to generate magnetic field, the magnetic field is opposite with the magnetic fields of magnet 31'.As a result, due to compressed spring
The power of 33', control shaft 27 can be mobile towards the direction of loop coil 30.By the magnetic field of magnet 31 and by toroid
Circle 30 applies voltage to support the movement, so that the loop coil generates magnetic field, passes through the sum that compressed spring 33 is resisted in the magnetic field
The power of leaf spring 25 pulls control shaft 27.Once control shaft 27 sticks on magnet 32, loop coil 30 and 30' can switch
For no-voltage.
In fig 5 a, together with 20 ground of lockup piston with its leaf spring 25 drawn roughly again with the side of extremely strong strong simplification
Formula shows controlling curve 26 and two loop coils 30 and 30' and compressed spring 33 and 33'.Here, it will be apparent that ground is seen
To: lock the flank of piston sliding surface 23 can be moved to from the maximum portion 29 of controlling curve 26 minimum portion 28 and otherwise also
So.Herein it also seen that: no lockable mechanism is arranged on controlling curve 26.Therefore, two magnets 31 and 31' are used in toroid
Control shaft 27 is set to be maintained at two final position in the case where circle 30 or 30' no-voltage.
The improvement project of controlling curve 26 is very schematically illustrated in figure 5b.Here, it is configured to recess portion 36 and 37
Lock slots respectively place at minimum portion 28 and maximum portion 29.Its profile corresponds to the sliding surface on the flank of locking piston 20
23.Locking piston 20 can be locked in two position as a result, the magnet without using round bar shape on loop coil.
Simple bistable arrangement is provided in this way.
Reference signs list
1 pendulum-type rocker arm
2 outer rocker arms
32 arm
4 inner rocker arms
54 centre portion
6 idler wheels
7 contact pin
81 downside
9 abutment faces
10 axis
11 bolts
12 torsionsprings
13 cylinder sandwich type elements
14 dome type contact surfaces
15 relative to 18 end
16 crossbeams
17 4 arm
18 2 relative to 15 end
19 operating mechanisms
20 locking pistons
Hole in 21 13
22 20 forward region
23 sliding surfaces
Ladder-like convex shoulder at 24 20
25 leaf springs
26 controlling curves
27 control shafts
28 minimum portions
29 maximum portions
30,30' loop coil
31, the magnet of 31' round bar shape
32,32' annular plug
33,33' compressed spring
34 25 middle section
35 retainers
36 recess portions
37 recess portions
Claims (10)
1. the cam follower that can switch of engine valve transmission facility, especially pendulum-type rocker arm (1), the cam follower
Have band there are two arm (3) outer rocker arm (2), be supported between described two arms (3) can pass through pivotal axis (10) relative to
The inner rocker arm (4) that the outer rocker arm moves pivotally, wherein at least described inner rocker arm (4) has on it for camshaft
The cam of at least one cam operates face, and the cam follower on an end (15) on the downside of it (8) have with
The abutment face (9) of scavenging air valve cooperation, and there is the contact surface (14) for being used to support element on its other end (18), it is described convex
Wheel driven member is also equipped on the outer rocker arm (2) the tank shape shell (13) opposite with the pivotal axis (10), spring loads
Locking piston (20) by substantially can perpendicular to the pivotal axis (10) it is mobile in a manner of be supported in the tank shape shell, and
And the locking piston makes the inner rocker arm (4) separate and lock with the outer rocker arm (2) in terms of movement in unlock station
It connect the inner rocker arm (4) with the outer rocker arm (2) in tight station, and the cam follower is additionally provided with operating mechanism
(19) for moving the locking piston (20), which is characterized in that the operating mechanism (19) includes the rush to be worked in a manner of electric
Dynamic device and control shaft (27), wherein the control shaft (27) and the pivotal axis (10) are parallelly arranged in the tank shape shell
On body (13) and make the locking piston motion into locking station or unlock station.
2. the cam follower according to claim 1 that can switch, which is characterized in that the control shaft (27) is supported on cloth
It is placed in the support housing on the tank shape shell (13) and there are controlling curve (26), the controlling curve has maximum portion
(29) and minimum portion (28).
3. the cam follower according to claim 2 that can switch, which is characterized in that the locking piston (20) is in its face
There is the flank with curved sliding surface (23) at towards the forward region (22) of the controlling curve (26).
4. the cam follower according to any one of the preceding claims that can switch, which is characterized in that the control is bent
Line (26) is respectively provided with locking system at maximum portion (29) and minimum portion (28).
5. the cam follower that can switch according at least one of the claims, which is characterized in that described with electricity
The actuator that mode works has loop coil (30,30').
6. the cam follower that can switch according at least one of the claims, which is characterized in that described with electricity
The actuator that mode works has loop coil (30,30'), and the loop coil has the magnetic for the round bar shape being disposed centrally therein
Body (31,31').
7. the cam follower that can switch according at least one of the claims, which is characterized in that respectively there is one
The actuator to be worked in a manner of electric is arranged at two end sides of the control shaft (27).
8. the cam follower that can switch according at least one of the claims, which is characterized in that in the control
Compressed spring (33,33') are supported by two end sides of axis (27) processed respectively, the free end of the compressed spring is concentrically
Around the actuator to be worked in a manner of electric.
9. the cam follower according to claim 1 that can switch, which is characterized in that the locking piston (20) has convex
Shoulder (24), leaf spring (25) are arranged on the convex shoulder to keep locking piston (20) the Xiang Suoshu controlling curve (26) mobile,
The free end of the leaf spring is supported on the tank shape shell (13).
10. the cam follower that can switch according at least one of the claims, which is characterized in that electromagnetic actuation
Device can be manipulated by the engine control section of internal combustion engine.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018102778.8 | 2018-02-08 | ||
| DE102018102778.8A DE102018102778B4 (en) | 2018-02-08 | 2018-02-08 | Switchable rocker arm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110131007A true CN110131007A (en) | 2019-08-16 |
| CN110131007B CN110131007B (en) | 2022-09-02 |
Family
ID=67308415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910084536.9A Active CN110131007B (en) | 2018-02-08 | 2019-01-29 | Switchable cam follower for a valve train of an internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110131007B (en) |
| DE (1) | DE102018102778B4 (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010023675A1 (en) * | 2000-01-14 | 2001-09-27 | Jongmin Lee | Method and apparatus for two-step cam profile switching |
| DE102005006056A1 (en) * | 2005-02-10 | 2006-08-24 | Daimlerchrysler Ag | Device for coupling or decoupling two actuators of a valve train of an internal combustion engine and method thereof |
| DE102007029465A1 (en) * | 2007-06-26 | 2009-01-08 | Schaeffler Kg | Switchable drag lever of a valve train of an internal combustion engine |
| CN101495716A (en) * | 2006-07-19 | 2009-07-29 | 马勒国际有限公司 | Cam drive |
| CN101595280A (en) * | 2006-12-04 | 2009-12-02 | 伊顿公司 | Dual lift rocker arm latch mechanism and Effector thereof |
| US20100236508A1 (en) * | 2009-03-19 | 2010-09-23 | Schaeffler Technologies Gmbh & Co., Kg | Switchable cam follower of a valve train of an internal combustion engine |
| DE102010010733A1 (en) * | 2010-03-09 | 2011-09-15 | Schaeffler Technologies Gmbh & Co. Kg | Switchable drag lever |
| CN107109969A (en) * | 2014-10-10 | 2017-08-29 | 舍弗勒技术股份两合公司 | Mechanical lash control for switchable roller rocker arms |
| CN107208502A (en) * | 2015-01-13 | 2017-09-26 | 伊顿公司 | Switch rocking arm |
| CN107532485A (en) * | 2015-04-27 | 2018-01-02 | 伊顿公司 | Switching rocker arm assembly with the eccentric shaft adjusted for clearance |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4206166B4 (en) | 1991-03-14 | 2004-11-04 | Volkswagen Ag | Variable valve train for a lifting valve of a machine |
| DE4225796C2 (en) | 1992-04-27 | 1995-09-21 | Iav Motor Gmbh | Valve train for charge exchange valves of reciprocating internal combustion engines |
| DE4411182B4 (en) | 1994-03-31 | 2004-04-08 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Switchable valve control for internal combustion engines |
| DE19515367A1 (en) | 1995-05-02 | 1996-11-07 | Iav Motor Gmbh | Switchable valve drive for IC engines |
| DE102005037053A1 (en) | 2005-08-05 | 2007-02-08 | Schaeffler Kg | Switchable drag lever of a valve train of an internal combustion engine |
| WO2016197088A1 (en) | 2015-06-04 | 2016-12-08 | Eaton Corporation | Electrically latching rocker arm assembly having built-in obd functionality |
-
2018
- 2018-02-08 DE DE102018102778.8A patent/DE102018102778B4/en active Active
-
2019
- 2019-01-29 CN CN201910084536.9A patent/CN110131007B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010023675A1 (en) * | 2000-01-14 | 2001-09-27 | Jongmin Lee | Method and apparatus for two-step cam profile switching |
| DE102005006056A1 (en) * | 2005-02-10 | 2006-08-24 | Daimlerchrysler Ag | Device for coupling or decoupling two actuators of a valve train of an internal combustion engine and method thereof |
| CN101495716A (en) * | 2006-07-19 | 2009-07-29 | 马勒国际有限公司 | Cam drive |
| CN101595280A (en) * | 2006-12-04 | 2009-12-02 | 伊顿公司 | Dual lift rocker arm latch mechanism and Effector thereof |
| DE102007029465A1 (en) * | 2007-06-26 | 2009-01-08 | Schaeffler Kg | Switchable drag lever of a valve train of an internal combustion engine |
| US20100236508A1 (en) * | 2009-03-19 | 2010-09-23 | Schaeffler Technologies Gmbh & Co., Kg | Switchable cam follower of a valve train of an internal combustion engine |
| DE102010010733A1 (en) * | 2010-03-09 | 2011-09-15 | Schaeffler Technologies Gmbh & Co. Kg | Switchable drag lever |
| CN107109969A (en) * | 2014-10-10 | 2017-08-29 | 舍弗勒技术股份两合公司 | Mechanical lash control for switchable roller rocker arms |
| CN107208502A (en) * | 2015-01-13 | 2017-09-26 | 伊顿公司 | Switch rocking arm |
| CN107532485A (en) * | 2015-04-27 | 2018-01-02 | 伊顿公司 | Switching rocker arm assembly with the eccentric shaft adjusted for clearance |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018102778B4 (en) | 2024-05-23 |
| CN110131007B (en) | 2022-09-02 |
| DE102018102778A1 (en) | 2019-08-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101784759B (en) | Internal combustion engine valve drive switching device | |
| KR101378623B1 (en) | Internal combustion engine and valve drive for an internal combustion engine | |
| US10550739B2 (en) | Valvetrain with variable valve actuation | |
| JP5490862B2 (en) | Internal combustion engine and valve operating mechanism for internal combustion engine | |
| CN104395564A (en) | A rocker arm | |
| KR100612716B1 (en) | Variable compression ratio engine | |
| CN107401434B (en) | Device for actuating a rocker arm of a valve train of an internal combustion engine | |
| WO2004027224A1 (en) | Deactivation and tow-step roller finger follower having a bracket and lost motion spring | |
| US20140251250A1 (en) | Multiple variable valve lift apparatus | |
| US6467445B1 (en) | Deactivation and two-step roller finger follower having a slider bracket | |
| CN113669124A (en) | Rocker device for a valve train of an internal combustion engine | |
| CN208310862U (en) | Rocker arrangement and engine valve actuating mechanism | |
| US20190178116A1 (en) | Variable valve train of an internal combustion engine | |
| CN110131007A (en) | Switchable cam follower for a valve train of an internal combustion engine | |
| CN108691593B (en) | Valve drive device for internal combustion engine | |
| CN107923276A (en) | Valve transmission device, the internal combustion engine with valve transmission device and the method for running valve transmission device | |
| CN110439646A (en) | variable valve mechanism of reciprocating piston type internal combustion engine | |
| US8490587B2 (en) | Cam drive | |
| CN114575954A (en) | Rocker arm mechanism | |
| CN210118179U (en) | Valve drive system with two switching rocker arms | |
| US7255076B2 (en) | Variable valve lift apparatus for vehicle engines | |
| JP2019124176A (en) | Rocker arm | |
| EP1817484A1 (en) | Electromagnetically driven valve | |
| US11346257B2 (en) | Actuation arrangement for a valve train assembly | |
| US10704429B2 (en) | Switchable rocker arm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240320 Address after: 1st Floor, Building 2, No. 1 Antuo Road, Anting Town, Jiading District, Shanghai Patentee after: SCHAEFFLER HOLDING(CHINA) Co.,Ltd. Country or region after: China Address before: German Herzogenaurach Patentee before: SCHAEFFLER TECHNOLOGIES AG & CO.KG Country or region before: Germany |
|
| TR01 | Transfer of patent right |