CN109139168A - Valve train having an adjustable rocker arm - Google Patents

Valve train having an adjustable rocker arm Download PDF

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Publication number
CN109139168A
CN109139168A CN201810630166.XA CN201810630166A CN109139168A CN 109139168 A CN109139168 A CN 109139168A CN 201810630166 A CN201810630166 A CN 201810630166A CN 109139168 A CN109139168 A CN 109139168A
Authority
CN
China
Prior art keywords
cam
locking
locking pin
lock position
switching
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.)
Pending
Application number
CN201810630166.XA
Other languages
Chinese (zh)
Inventor
福尔克尔·施密特
沃尔夫冈·克里斯特根
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of CN109139168A publication Critical patent/CN109139168A/en
Pending legal-status Critical Current

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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
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—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
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the 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
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating valves
    • F01L2013/001—Deactivating cylinders
    • 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
    • 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
    • F01L2013/105—Hydraulic motors

Landscapes

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

Abstract

A valve drive system with an adjustable rocker arm for actuating at least one valve of at least one cylinder of an internal combustion engine by means of at least one main arm of the adjustable rocker arm, on which main arm an auxiliary arm is arranged so as to be pivotable about a pivot axis, which arm has a cam run-on surface for abutment against an associated cam of a camshaft, between which a controllable locking device is arranged, which has a locking pin which can be acted on by a switching web on a control element arranged parallel to the camshaft, and which can be moved into a locking position in which the auxiliary arm is locked in a form-fitting manner with the main arm if the cam of the camshaft lies with its cam base circle in the region of the associated cam run-on surface, and which can be returned into an unlocking position. For actuating the locking pin, the control element can be moved by means of the control unit in a translatory manner parallel to the axis of rotation of the camshaft in order to move the locking pin into its locking or unlocking position.

Description

Valve driving system with adjustable rocker arms
Technical field
The present invention relates to a kind of valve driving systems with adjustable rocker arms, are used for by adjustable rocker arms at least At least one valve of at least one cylinder of one principal arm manipulation internal combustion engine, with can be around the side that pivot axis pivots on principal arm Formula is disposed with can be with the auxiliary of principal arm locking, wherein there is at least one arm in these arms at least one cam face to be pushed to use To abut at least one cam attached of camshaft, wherein be disposed with the locking that can control between principal arm and auxiliary Equipment, locking device have and can switch soffit of girder by least one being parallel on the control element of cam shaft arrangement load Locking pin, if at least one cam that is associated with of camshaft pushes the cam in face to be in attached cam with its cam base circle In the region in promotion face, locking pin can move to the lock for making auxiliary and principal arm shape (formschl ü ssig) locking in locking manner During stop bit is set, and wherein, locking pin can be returned to and be gone in lock position.
Background technique
Such valve system as known in 20,15/,181 264 A1 of WO, tool are adjustable there are two what is be arranged in parallel Two valves being arranged side by side at least one cylinder of formula rocker arm to manipulate internal combustion engine.In order to can control manipulate locking Equipment is disposed with the control shaft that can be rotated by electric drive with being parallel to camshaft.Control shaft has control cam, to make Respective locking pin, which moves to, makes auxiliary shape in locking manner in the lock position of locking on principal arm.The well known arrangement needs Will rotating support to the locking shaft of strap cam manipulate locking device, and electric drive is needed, to cause required turn Dynamic movement.Bearing and electric drive of the locking shaft in combustion engine cylinder head be supported on space and cost in terms of expended Height, and therefore can not achieve in many cases.
Summary of the invention
In this context, task of the invention lies in for for making adjustable rocker arms in lock position (in the lock position Middle principal arm and auxiliary locking mechanically to each other) with go lock position (in the mechanical connection for going in lock position to cancel principal arm and auxiliary) it Between the mechanical device converted best scheme in terms of kinematics and structure space is provided and is inexpensively moulded as far as possible.
The task is solved by the valve driving system of the feature with claim 1.It mentions in the dependent claims To being advantageously improved scheme.
Therefore, the present invention relates to a kind of valve driving systems with adjustable rocker arms, and the valve driving system is for borrowing At least one principal arm of adjustable rocker arms is helped to manipulate at least one valve of at least one cylinder of internal combustion engine, with energy on principal arm Pivotably being disposed with around pivot axis can be with the auxiliary of principal arm locking, wherein at least one arm in these arms has extremely A few cam pushes face to be used to abut at least one cam attached of camshaft, wherein between principal arm and auxiliary Be disposed with the locking device that can control, locking device have can by be parallel on the control element of cam shaft arrangement at least one A locking pin for switching the soffit of girder to load, if at least one cam that is associated with of camshaft pushes the cam in face with its cam base For circle in the region that attached cam pushes face, locking pin, which can move to, makes auxiliary and principal arm shape locking in locking manner In lock position, and wherein, locking pin can be returned to and be gone in lock position.
It is arranged according to the present invention in the valve driving system, the control element energy at least one switching soffit of girder By control unit, parallel-moving type is moved in a manner of being parallel to cam axle axis, to make locking pin move to lock position In or move in lock position.
Have one or more is adjustable to shake corresponding to cylinder or valve quantity for the valve driving system of internal combustion engine Arm, and the control element including having corresponding controlling profile.These controlling profiles can be selectively by lockable mechanism Disconnection effect connection (Wirkverbindung), and it is placed in adjustable rocker arms therefore in the first switching state, or can be with It is in effect connection by the displacement of control element, to be placed in adjustable rocker arms therefore in the second switching state.According to The present invention, the displacement carry out to such parallel-moving type as has been described, controlling profile well known to the translation compared with the existing technology Revolving displacement is advantageous.Lockable mechanism be not at in the state of the effect connection of controlling profile against can lead to Reset spring is crossed to realize.However the in addition, interface energy to work in two directions between controlling profile and lockable mechanism The enough company's of being similar to control rail mounted (desmodromisch) control is to realize.Valve driving system can extend on multiple cylinders, Wherein, cam promotion only is associated with for camshaft when each cam base circle of the cam on the camshaft of internal combustion engine is in When the cam of the cam in face is pushed in the region of face, switching just will do it.
According to the present invention, here, the adjusting momentum (Verstellimpuls) being applied on locking pin is mechanically kept in In the elastic component in interface between controlling profile and lockable mechanism.As long as lockable mechanism not yet reaches the final of its locking It is temporary will to carry out always this for positioning.When the cam that is associated with of camshaft pushes the cam in face to be in principal arm with its cam base circle When pushed in the region in face with the cam on auxiliary, the remainder stroke of lockable mechanism is released and makes the lockable mechanism by locking Temporary spring force on pin and then guides (nachf ü hren) into its most final position.According to particularly advantageous design scheme, control Ratch exterior feature can be implemented with flexibility certainly, such as be made of spring band material.
It is provided that according to the scheme that is advantageously improved of the valve driving system with feature of the invention, locking pin energy gram It moves in lock position with taking the power of spring element.The advantages of structure, will also be explained in detail by embodiment.
The spring element for being configured to the flexible region of locking pin correspondingly includes compressed spring, the spring of the compressed spring Constant is greater than the spring constant of the reset spring on locking pin.Facilitated by the switching soffit of girder of the control element of energy translation type movable It is configured to the preload that the spring element in the flexible region of locking pin is carried out in a manner of temporary, until locking pin reaches its locking In position, in lock position, the cam that is associated with of camshaft pushes the cam in face to be in cam promotion face with its cam base circle Region in, and be directed to locking pin and then in its lock position by temporary spring force.
The control element of energy translation type movable at least one switching soffit of girder preferably can be structured as switching stick, and It can be by being configured to the control unit of hydraulic or electric linear actuator in lock position and go between lock position by starting Machine control unit is manipulated in a controlled manner.
It can be set according to the scheme of being advantageously improved, adjustable rocker arms are configured at least one to internal combustion engine Two valves being arranged side by side of a cylinder are manipulated.
Detailed description of the invention
Embodiment shown in below with reference to accompanying drawings is next, and the present invention is further explained.Wherein:
Fig. 1 shows for while manipulating the adjustable of the jag of two valves being parallelly arranged in the cylinder head of internal combustion engine The perspective view of formula rocker arm；
Fig. 2 to overlook the schematic diagrames of the adjustable rocker arms for illustrating the jag according to Fig. 1 in following switching position, In the switching position, the auxiliary of adjustable rocker arms takes off with principal arm to be coupled；
Fig. 3 shows the schematic diagram of the adjustable rocker arms of the jag according to the present invention in following switching position, cuts at this In change place, the spring element of locking pin is temporarily stored in the component of elasticity, and it is necessary for illustrating only for this keep in Structural detail, and
Fig. 4 is illustrated with overlooking by the locking being located in the latched position that it causes the locking between principal arm and auxiliary Sell the schematic diagram of the adjustable rocker arms according to Fig. 3 in the lock position of the principal arm and auxiliary that generate.
Specific embodiment
Therefore, Fig. 1 shows the adjustable rocker arms 1 of jag, can manipulate two simultaneously and be parallelly arranged in internal combustion engine Cylinder head in valve 11,12.Adjustable rocker arms 1 are by principal arm 2 and can pivotally support around pivot axis 4 in principal arm Auxiliary 3 on 2 is constituted.Principal arm 2 includes that two cams being parallel to each other, axially spaced push face 5,6, unshowned cam The cam that is associated with of axis pushes the cam in face that can be applied on these cam promotion faces, to swing adjustable rocker arms 1 simultaneously And open and close valve 11,12.Cam bawl is disposed in a manner of it can turn around shaft line 7a and rotationally support on auxiliary 3 7, it is spaced apart with cam bawl 7 and unshowned camshaft is supported in known manner in the cylinder head of internal combustion engine in parallel. The surface of cam bawl 7 forms the cam promotion face 8 for the cam being arranged on camshaft for manipulating auxiliary 3.
It is disposed with locking device 9 on principal arm 2,10 axially displaceable of locking pin of the locking device, so as in order to make to lead Arm 2 and 3 locking of auxiliary and be embedded into the unshowned recess portion of auxiliary 3, and cause the locking between two structural details.
The end opposite with the end of the jag of adjustable rocker arms 1 is by means of bulb support 13 can pivotably prop up It holds in the unshowned cylinder head of internal combustion engine.Two scroll springs 14,15 for being arranged in 9 two sides of locking device be used to make pair Arm 3, which is maintained at, can be realized between principal arm 2 and auxiliary 3 in the position of locking, and undertaking makes auxiliary 3 begin under de- coupled situation It is resisted against being associated on the cam of auxiliary for camshaft eventually.
What Fig. 2 was schematically cooperated by the control element 19 that vertical view illustrates the switching stick in the form of for energy translation type movable Adjustable rocker arms 1, the switching stick of energy translation type movable have the switching soffit of girder 20, and the switching soffit of girder has stair-stepping geometry. The control element 19 is applied on the locking pin 10 of adjustable rocker arms 1 using the visible switching soffit of girder 20.Control element can be borrowed Help electromechanical or hydraulic linear actuator 21 to move in position shown in Fig. 2, in this position, locking pin 10 not with pair The recess portion of arm 3 is rabbeted.In order to follow the stair-stepping geometry for switching the soffit of girder 20 of the control element 19, spring force court It is applied on locking pin 10 to the direction of the switching soffit of girder 20.The spring force is generated by reset spring 16, and reset spring is coaxially Locking pin 10 is surrounded, and is supported on support 17 with the end close to the switching soffit of girder, the pedestal configurations are on locking pin 10.It is multiple Position spring 16 is supported on principal arm 2 with its other axial end portion.
Control element 19 can the duty cycle of the respective cylinder of internal combustion engine any time by linear actuator 21 move in position shown in Fig. 3, thus lift locking pin 10 and with the wall of its other end touching auxiliary 3. It as a result, compresses the spring element 18 in the flexible region for being configured to locking pin 10, is disposed with compressed spring wherein, the compression The spring constant of spring is greater than the spring constant of reset spring 16, to keep the spring force of the compressed spring temporary always It deposits, as long as lockable mechanism can not yet reach the final positioning for the locking that it is shown in FIG. 4.Once camshaft is associated with cam Promotion face 5,6；8 cam is in these cams with its cam base circle and pushes face 5,6；In 8 region, lockable mechanism can be arrived Up to the final positioning, so that locking pin 10 be allow to enter in the corresponding recess portion of auxiliary 3.
When auxiliary 3 according to fig. 2 and principal arm 2 do not have locking, the only cam being associated on principal arm 2 on IC engine camshaft The cam in promotion face 5,6 is applied to adjustable rocker arms 1, and auxiliary 3 is without making land used spring when cam load occurs on principal arm 2. This may mean that valve 11,12 is remained turned-off or only slightly opens or only opened with small open angle.With this side Formula allows attached cylinder to completely cut through ground or with Power operation become smaller but low-power consumption.If necessary to internal combustion engine Total power, then making principal arm 2 and 3 locking of auxiliary according to Fig. 4, so that the cam for making the cam on camshaft be applied to auxiliary 3 rolls Son 7 on, and thus facilitate valve 11,12 biggish opening lift and/or longer valve opening time.The conversion passes through Control unit of engine is automatically carried out dependent on the power demand to internal combustion engine.
It is apparent that the control element 19 at least one switching soffit of girder 20, the control element are parallel to camshaft It can be moved to parallel-moving type by control unit 21 to pivot center, to make locking pin 10 move to the lock position according to Fig. 4 In and move to going in lock position according to fig. 2, this may be implemented to make the mechanical connection of principal arm 2 and auxiliary 3 not only in kinematics It aspect and is all achieved in terms of required structure space with particularly advantageous scheme, and realized compared with the existing technology Significant progress.
Reference signs list
1 adjustable rocker arms
2 principal arms
3 auxiliarys
4 pivot axis
First cam of 5 principal arms pushes face
Second cam of 6 principal arms pushes face
7 cam bawls
The pivot center of 7a cam bawl
Cam on 8 cam bawls pushes face
9 locking devices
10 locking pins
11 valves
12 valves
13 bulb supports
14 first scroll springs
15 second scroll springs
16 reset springs
17 are directed to the support of reset spring
18 spring elements, flexible region
The switching stick of 19 control elements, energy translation type movable
The 20 switching soffit of girders
21 linear actuators

Claims (6)

1. the valve driving system with adjustable rocker arms (1), the valve driving system is used for by the adjustable rocker arms (1) at least one valve (11,12) of at least one cylinder of at least one principal arm (2) manipulation internal combustion engine, in the principal arm On with can pivotably be disposed with around pivot axis (4) can be with the auxiliary (3) of the principal arm (2) locking, wherein these arms There is at least one arm in (2,3) at least one cam to push face (5,6；8) it is used to abut at least one of camshaft and matches On the cam of category, wherein the locking device (9) that can control is disposed between the principal arm (2) and the auxiliary (3), it is described Locking device has and can be added by least one switching soffit of girder (20) being parallel on the control element (19) of cam shaft arrangement The locking pin (10) of load, if at least one the described cam that is associated with of the camshaft pushes face (5,6；8) cam is with it The cam that cam base circle is in attached pushes face (5,6；8) in region, the locking pin, which can move to, makes the auxiliary (3) and in the principal arm (2) shape in locking manner lock position of locking, and wherein, the locking pin (10) can return to and go In lock position, which is characterized in that have the control element (19) of at least one switching soffit of girder (20) can be by control unit (21) parallel-moving type moves in a manner of being parallel to cam axle axis, to make the locking pin (10) move to the locking In position or move to described go in lock position.
2. valve driving system according to claim 1, which is characterized in that the locking pin (10) can overcome spring element (18) it moves in the lock position to power.
3. valve driving system according to claim 2, which is characterized in that be configured to the flexible of the locking pin (10) The spring element (18) in region has compressed spring, and the spring constant of the compressed spring is greater than the reset bullet on locking pin (10) The spring constant of spring.
4. valve driving system according to any one of claim 1 to 3, which is characterized in that have it is described at least one The control element (19) for switching the energy translation type movable of the soffit of girder (20) is configured to switching stick, and the switching stick can be by being configured to liquid The control unit (21) of the linear actuator of pressure or electricity is in the lock position and described goes between lock position through engine control Unit processed is manipulated in a controlled manner.
5. valve driving system according to any one of claim 2 to 4, which is characterized in that pass through the control element (19) what the switching soffit of girder (20) caused the spring element (18) for being configured to the flexible region of the locking pin (10) to be kept in The preload that mode carries out specifically is pre-tightened always until the locking pin (10) reaches in its lock position, in the lock During stop bit is set, the cam that is associated with of the camshaft pushes face (5,6；8) cam is in described convex with its cam base circle Take turns promotion face (5,6；8) make the locking pin (10) in region and by the temporary spring force of the spring element (18) And then it is directed in its lock position.
6. valve driving system according to any one of claim 1 to 5, which is characterized in that the adjustable rocker arms (1) The valve (11,12) for being configured for being arranged side by side to two of at least one cylinder of internal combustion engine manipulates.
CN201810630166.XA 2017-06-19 2018-06-19 Valve train having an adjustable rocker arm Pending CN109139168A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017113362.3 2017-06-19
DE102017113362.3A DE102017113362A1 (en) 2017-06-19 2017-06-19 Valve train system with a shift cam follower

Publications (1)

Publication Number Publication Date
CN109139168A true CN109139168A (en) 2019-01-04

Family

ID=64457380

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810630166.XA Pending CN109139168A (en) 2017-06-19 2018-06-19 Valve train having an adjustable rocker arm

Country Status (2)

Country Link
CN (1) CN109139168A (en)
DE (1) DE102017113362A1 (en)

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