CN108487961A - A kind of variable air valve lift range mechanism - Google Patents
A kind of variable air valve lift range mechanism Download PDFInfo
- Publication number
- CN108487961A CN108487961A CN201810260221.0A CN201810260221A CN108487961A CN 108487961 A CN108487961 A CN 108487961A CN 201810260221 A CN201810260221 A CN 201810260221A CN 108487961 A CN108487961 A CN 108487961A
- Authority
- CN
- China
- Prior art keywords
- rocking arm
- air valve
- variable air
- valve lift
- lift range
- 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
Links
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
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
- F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
- F01L9/12—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a kind of variable air valve lift range mechanisms, and rocking arm is acted on by cam, using hydraulic tappet as fulcrum, so that rocking arm moves downward, fuel feeding or oil return are carried out to oil pocket by hydraulic tappet simultaneously, to control valve stroke, realize cylinder deactivation or normal work；Since hydraulic action can realize stepless regulating according to charge oil pressure size, to be conducive to, to the variable quantity realization stepless regulating of valve stroke, then improve the precision of valve stroke regulation and control；Simple in structure, control manipulation is more flexible, functional reliability higher.
Description
Technical field
The present invention relates to engine art, especially a kind of variable air valve lift range mechanism.
Background technology
It is become increasingly popular with energy saving and environmental protection concept, automotive energy-saving emission-reducing is more taken seriously, and engine variable gas
Door lift technology is to realize an effective means of automotive energy-saving emission-reducing.For reply climbing and accelerating mode, the work(of engine
Rate have it is more than needed, so automobile power of engine when running at a low speed has a very big waste, and engine variable valve lift
Technology can change the lift of valve under different operating modes, to change engine power, can both make full use of engine work(
Rate, and fuel consumption can be reduced, exhaust gas discharge is reduced, energy-saving and environment-friendly effect is reached.Currently, most of lift range variables
Mechanism is cam displacement, more cams, inside and outside rocker arm body, wherein inside and outside rocker arm body can only realize cylinder deactivation or height lift mostly
Variation, mechanism is complicated, and reliability is low, and cost is higher.
As shown in Figure 1, for a kind of common variable air valve lift range mechanism of the prior art, 10 upper end of shell connects with cam
It touches, 70 lower end of holder is contacted with valve stem and valve spring.Operation principle of the mechanism in cylinder deactivation be：To the logical height of cavity 220
Pressure oil makes lock pin 40 be moved to the direction far from casing center, to make holder 70 be detached with shell 10.When the downward pressure shell of cam
When body 10, because the valve spring intensity of 70 lower end of holder is higher than the spring 60 of the upper end, housing compresses spring 60 is downward
Movement, valve is motionless, realizes cylinder deactivation.Operation principle of the mechanism in not cylinder deactivation be：The high pressure oil of cavity 22 is laid down, lock pin 40
It is moved to casing center position under the action of spring 30, so that holder 70 and shell 10 is engaged, shell 10 drives holder 70 together
It moves downward, to make valve move downward.
However, there are following technological deficiencies for this variable air valve lift range mechanism in the prior art：It is locked using hydraulic control
The mode of pin, mechanism are complicated；Shell is controlled by lock pin to engage and detach with holder, can only realize cylinder deactivation and works normally two kinds
Pattern；By spring make lock pin return in the way of reliability it is relatively low.
Invention content
The object of the present invention is to provide a kind of variable air valve lift range mechanisms, and to solve deficiency in the prior art, it can
Simple in structure using the electrodeless control valve stroke of hydraulic pressure, reliability is high.
The present invention provides a kind of variable air valve lift range mechanism, including cam, bearing, rocking arm, hydraulic tappet and valve,
The cam is contacted with the outer ring of bearing, and bearing is located at the lower section of cam, and the axis of bearing is parallel to cam
Axis；
The rocking arm is set to the lower section of cam, and the intermediate position of rocking arm is equipped with the first installation for installing the bearing
Hole, the inner ring of bearing are connected with the inner wall of the first mounting hole, the bottom surface of the first end of rocking arm be equipped with for hydraulic tappet
The bottom surface of the second connected mounting hole of top, the second end of rocking arm is equipped with oil pocket, and the inner surface of oil pocket is equipped with several the first oil
Hole, the oil duct of rocking arm being internally provided with for the second mounting hole to be connected with several first oilholes respectively are equipped in oil pocket
Elastic element and the piston coordinated with the side seal of oil pocket week, elastic element is between oil pocket and the top surface of piston, the bottom of piston
Face is connected with valve, and hydraulic tappet and valve are respectively positioned on the lower section of rocking arm；
The top of the hydraulic tappet is equipped with the second oilhole for being connected with the second mounting hole, the side of hydraulic tappet
Equipped with the fuel feed hole and oil return hole for being connected with the second oilhole, the bottom end of hydraulic tappet is fixed at engine cylinder cover
On.
Variable air valve lift range mechanism as described above, wherein preferably, the variable air valve lift range mechanism further includes peace
Axis is filled, the bearing socket is fixed in installation axle, and the axial both ends of installation axle are connected with the inner wall of the first mounting hole.
Variable air valve lift range mechanism as described above, wherein preferably, the bearing is set as needle bearing.
Variable air valve lift range mechanism as described above, wherein preferably, there are two the oil duct is set, two oil
Road is distributed in the both sides of the first mounting hole.
Variable air valve lift range mechanism as described above, wherein preferably, first mounting hole is rectangular opening.
Variable air valve lift range mechanism as described above, wherein preferably, the bottom surface of the second end of the rocking arm, which is fixed, to be set
It is equipped with convex block, the oil pocket is arranged in the convex block.
Variable air valve lift range mechanism as described above, wherein preferably, the convex block is integrated into rocking arm setting
Type.
Variable air valve lift range mechanism as described above, wherein preferably, the elastic element is spring, the spring
One end in an axial direction be fixedly connected with the inner roof wall of oil pocket, the other end is connected with piston.
The present invention during the work time, when the profile of the boss of cam acts on bearing, due to hydraulic tappet
It is fixedly connected with engine cylinder cover, then rocking arm is support with hydraulic tappet, and shaft strength drives the second end of rocking arm to move downward.
Rocking arm first moves downward the elastic element of compressed oil intracavitary, since the rigidity of the elastic element in oil pocket is less than the rigid of valve spring
Degree, therefore valve is motionless；Rocking arm continues to move downward, while hydraulic tappet fuel feeding into oil pocket, produced by the oil pressure in oil pocket
Power be more than valve spring deformation needed for power when, valve is moved downward with rocking arm.When the hydraulic tappet not fuel feeding into oil pocket, and
When oil in oil pocket is flowed back to by hydraulic tappet by oil return hole, the spring of rocking arm compressed oil intracavitary, and valve is failure to actuate, to
Realize cylinder deactivation.
When the base circle portion of cam acts on needle bearing, valve return drives piston return, due to the bullet of oil pocket
The effect of spring, rocking arm always with cam contact, to ensure the stabilization of valve operation.
Compared with prior art, variable air valve lift range mechanism provided by the invention acts on rocking arm, with hydraulic pressure by cam
Tappet is fulcrum, so that rocking arm moves downward, while carrying out fuel feeding or oil return by hydraulic tappet to oil pocket, to control
Valve stroke realizes cylinder deactivation or normal work；Since hydraulic action can realize electrodeless tune according to charge oil pressure size
Control, to be conducive to, to the variable quantity realization stepless regulating of valve stroke, then improve the precision of valve stroke regulation and control；Structure
Simply, control manipulation is more flexible, functional reliability higher.
Description of the drawings
Fig. 1 is the sectional view of variable air valve lift range mechanism in the prior art；
Fig. 2 is the overall structure figure of the present invention；
Fig. 3 is the explosive view for the variable air valve lift range mechanism that a kind of embodiment of the present invention provides；
Fig. 4 is the axonometric drawing of rocking arm；
Fig. 5 is the sectional view of rocking arm；
Fig. 6 is the axonometric drawing of hydraulic tappet；
Fig. 7 is the axonometric drawing that the bearing that a kind of embodiment of the present invention provides is connected with installation axle.
Reference sign：10- shells, 220- cavitys, 30- springs, 40- lock pins, 60- springs, 70- holders, 1- cams,
2- bearings, 3- rocking arms, the first mounting holes of 31-, 3101- mounting grooves, the second mounting holes of 32-, 33- convex blocks, 34- oil pockets, 3401-
One oilhole, 35- oil ducts, 4- hydraulic tappets, the second oilholes of 401-, 402- fuel feed holes, 403- oil return holes, 5- valves, 6- elasticity members
Part, 7- pistons, 8- installation axles.
Specific implementation mode
The embodiments described below with reference to the accompanying drawings are exemplary, is only used for explaining the present invention, and cannot be construed to
Limitation of the present invention.
As shown in Figures 2 to 7, the embodiment provides a kind of variable air valve lift range mechanisms, including cam 1, axis
2, rocking arm 3, hydraulic tappet 4 and valve 5 are held, cam 1 is contacted with the outer ring of bearing 2, and bearing 2 is located at the lower section of cam 1, and bearing
2 axis is parallel to the axis of cam 1；Rocking arm 3 is set to the lower section of cam 1, and the intermediate position of rocking arm 3, which is equipped with, is used for installation axle 8
First mounting hole 31 of bearing 2, the inner ring of bearing 2 are connected with the inner wall of the first mounting hole 31, the bottom surface of the first end of rocking arm 3
Equipped with the second mounting hole 32 for being connected with the top of hydraulic tappet 4, the bottom surface of the second end of rocking arm 3 is equipped with oil pocket 34, oil
The inner surface of chamber 34 is equipped with several 3,401 second oilholes 401 of the first oilhole, and rocking arm 3 is internally provided with for by the second mounting hole
32 oil ducts 35 being connected respectively with several 3,401 second oilholes 401 of the first oilhole, be equipped in oil pocket 34 elastic element 6 and with
Oil pocket side seal in 34 weeks cooperation piston 7, elastic element 6 positioned at oil pocket 34 and the top surface of piston 7 between, the bottom surface of piston 7 and
Valve 5 is connected, and hydraulic tappet 4 and valve 5 are respectively positioned on the lower section of rocking arm 3；The top of hydraulic tappet 4 is equipped with for being installed with second
The second oilhole 401 that hole 32 is connected, the side of hydraulic tappet 4 are equipped with the fuel feed hole 402 for being connected with the second oilhole 401
With oil return hole 403, the bottom end of hydraulic tappet 4 is fixed at engine cylinder and covers.
Wherein, the second mounting hole 32 and 3,401 second oilhole 401 of the first oilhole are blind hole, and the second mounting hole 32 and
The opening direction of one oilhole, 3,401 second oilhole 401 is arranged downward；The opening direction of second oilhole 401 is arranged upward, is shaking
During arm 3 is moved downward using the top of hydraulic tappet 4 as fulcrum, the second oilhole 401 is remained with the second mounting hole 32
Connection.
The working method of the embodiment of the present invention is：When the profile of the projection portion of cam 1 acts on bearing 2, by
It is fixedly connected with engine cylinder cover in hydraulic tappet 4, then rocking arm 3 is support with hydraulic tappet 4, and the band in stress of bearing 2 shakes
The second end of arm 3 moves downward.Rocking arm 3 first moves downward the elastic element 6 in compression oil pocket 34, due to the elasticity in oil pocket 34
The rigidity of element 6 is less than the rigidity of 5 spring of valve, therefore valve 5 is motionless；Rocking arm 3 continues to move downward, at the same hydraulic tappet 4 to
Fuel feeding in oil pocket 34, when the power caused by the oil pressure in oil pocket 34 is more than power needed for 5 camber of spring of valve, valve 5 is with rocking arm 3
It moves downward.Oil when the not fuel feeding into oil pocket 34 of hydraulic tappet 4, and in oil pocket 34 is by hydraulic tappet 4 by oil return hole 403
When flowing back to, the spring in 3 compression oil pockets 34 of rocking arm, and valve 5 is failure to actuate, to realize cylinder deactivation.
When the base circle portion of cam 1 acts on needle bearing 2,5 return of valve, band 7 return of piston, due to oil pocket
The effect of 34 spring, rocking arm 3 are contacted with cam 1 always, to ensure the stabilization of the work of valve 5.
As shown in Figure 3 and Figure 7, the present embodiment is preferably, and the variable air valve lift range mechanism further includes installation axle 8, institute
It states bearing 2 to be fixed by socket in installation axle 8, the axial both ends of installation axle 8 are connected with the inner wall of the first mounting hole 31.
Further, as shown in Figure 3 and Figure 4, it is set on the inner wall of the first mounting hole 31 there are two opposite mounting groove 3101,
Mounting groove 3101 is matched with installation axle 8, and the axial both ends of installation axle 8 are limited in the mounting groove 3101.Pacified by being arranged
Tankage 3101 is conveniently replaceable installation axle 8 and/or bearing 2.
Still further, it will be appreciated by those skilled in the art that, can not have to setting mounting groove 3101, only need by
The axial both ends of installation axle 3101 are weldingly fixed on the inner wall of the first mounting hole 31, can also realize corresponding function.
As shown in Figure 2 and Figure 7, the present embodiment is preferably, and bearing 2 is set as needle bearing.
As shown in figure 5, the present embodiment is preferably, there are two the oil duct 35 is set, accordingly, first oilhole 3401
Two are set as, each oil duct 35 is separately connected first oilhole 3401, and two oil ducts 35 are distributed in first
The both sides of mounting hole 31.
As shown in Figure 3 and Figure 4, the present embodiment is preferably, and first mounting hole 31 is rectangular opening, rectangular opening and bearing
2 apron space is adapted, and is conducive to save space and processing cost.
Such as figure the present embodiment is preferably, and the bottom surface of the second end of the rocking arm 3 is fixedly installed convex block 33, and oil pocket 34 is set
It sets in the convex block 33.Convex block 33 individually is set in the second end of rocking arm 3, it is for processing oil pocket 34, then convex far from this on rocking arm 3
Smaller thickness can be arranged in other positions of block 33, be conducive to save cost of material, be also beneficial to reduce lift mechanisms
Overall weight.
As shown in Figure 4 and Figure 5, the present embodiment is preferably, and the convex block 33 is integrally formed with the setting of rocking arm 3.One
Molding processing and fabricating mode not only contributes to the quality and precision that improve machine-shaping, also advantageously improves structural strength.
As shown in Figures 2 and 3, the present embodiment is preferably, and the elastic element 6 is spring, and the spring is in an axial direction
One end be fixedly connected with the inner roof wall of oil pocket 34, the other end is connected with piston 7.Acting force of the spring was being run along its axial direction
Directional stability is higher in journey.It will be appreciated by those skilled in the art that elastic element 6 can select any other form
Elastomeric element, as long as its function in the present embodiment can be realized.
The variable air valve lift range mechanism that the embodiment of the present invention provides, acts on rocking arm by cam, is with hydraulic tappet
Fulcrum, so that rocking arm moves downward, while carrying out fuel feeding or oil return by hydraulic tappet to oil pocket, to control valve liter
Journey realizes cylinder deactivation or normal work；Since hydraulic action can realize stepless regulating according to charge oil pressure size, to
Be conducive to realize stepless regulating to the variable quantity of valve stroke, then improve the precision of valve stroke regulation and control；It is simple in structure, it adjusts
Control operates more flexible, functional reliability higher.
The structure, feature and effect of the present invention, the above institute are described in detail based on the embodiments shown in the drawings
Only presently preferred embodiments of the present invention is stated, but the present invention is not to limit practical range, every structure according to the present invention shown in drawing
Change made by thinking, or is revised as the equivalent embodiment of equivalent variations, when not going beyond the spirit of the description and the drawings,
It should all be within the scope of the present invention.
Claims (8)
1. a kind of variable air valve lift range mechanism, it is characterised in that：Including cam (1), bearing (2), rocking arm (3), hydraulic tappet (4)
With valve (5),
The cam (1) contacts with the outer ring of bearing (2), and bearing (2) is located at the lower section of cam (1), and the axis of bearing (2) is flat
Row is in the axis of cam (1)；
The rocking arm (3) is set to the lower section of cam (1), and the intermediate position of rocking arm (3) is equipped with for installing the bearing (2)
The inner ring of one mounting hole (31), bearing (2) is connected with the inner wall of the first mounting hole (31), the bottom surface of the first end of rocking arm (3)
Equipped with the second mounting hole (32) for being connected with the top of hydraulic tappet (4), the bottom surface of the second end of rocking arm (3) is equipped with oil pocket
(34), the inner surface of oil pocket (34) is equipped with several first oilholes (3401), and rocking arm (3) is internally provided with for being installed second
The oil duct (35) that hole (32) is connected with several first oilholes (3401) respectively, be equipped in oil pocket (34) elastic element (6) and
With the piston (7) of all side seal cooperations of oil pocket (34), elastic element (6) is located between oil pocket (34) and the top surface of piston (7), living
The bottom surface of plug (7) is connected with valve (5), and hydraulic tappet (4) and valve (5) are respectively positioned on the lower section of rocking arm (3)；
The top of the hydraulic tappet (4) is equipped with the second oilhole (401) for being connected with the second mounting hole (32), and hydraulic pressure is endured
The side of column (4) is equipped with fuel feed hole (402) and oil return hole (403) for being connected with the second oilhole (401), hydraulic tappet
(4) bottom end is fixed at engine cylinder and covers.
2. variable air valve lift range mechanism according to claim 1, it is characterised in that：The variable air valve lift range mechanism also wraps
Installation axle (8) is included, the bearing (2) is fixed by socket in installation axle (8), axial both ends and the first mounting hole of installation axle (8)
(31) inner wall is connected.
3. variable air valve lift range mechanism according to claim 2, it is characterised in that：The bearing (2) is set as needle roller axis
It holds.
4. according to the variable air valve lift range mechanism described in claims 1 to 3 any one, it is characterised in that：The oil duct (35)
If there are two, two oil ducts (35) are distributed in the both sides of the first mounting hole (31).
5. variable air valve lift range mechanism according to claim 4, it is characterised in that：First mounting hole (31) is rectangle
Hole.
6. variable air valve lift range mechanism according to claim 4, it is characterised in that：The bottom of the second end of the rocking arm (3)
Face is fixedly installed convex block (33), and oil pocket (34) setting is in the convex block (33).
7. variable air valve lift range mechanism according to claim 6, it is characterised in that：The convex block (33) sets with rocking arm (3)
Set as one molding.
8. variable air valve lift range mechanism according to claim 6, it is characterised in that：The elastic element (6) is spring, institute
The one end in an axial direction for stating spring is fixedly connected with the inner roof wall of oil pocket (34), and the other end is connected with piston (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810260221.0A CN108487961A (en) | 2018-03-27 | 2018-03-27 | A kind of variable air valve lift range mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810260221.0A CN108487961A (en) | 2018-03-27 | 2018-03-27 | A kind of variable air valve lift range mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108487961A true CN108487961A (en) | 2018-09-04 |
Family
ID=63316729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810260221.0A Pending CN108487961A (en) | 2018-03-27 | 2018-03-27 | A kind of variable air valve lift range mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108487961A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961917A (en) * | 2022-08-01 | 2022-08-30 | 龙口中宇热管理系统科技有限公司 | Rocker arm type valve control mechanism for dynamic cylinder closing of engine and engine |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4128085A (en) * | 1976-05-17 | 1978-12-05 | Nissan Motor Company, Limited | Engine mechanical loss reducing system |
| US5544628A (en) * | 1994-07-06 | 1996-08-13 | Volkswagen Ag | Valve control arrangement for an internal combustion engine |
| DE19608651A1 (en) * | 1996-03-06 | 1997-09-11 | Schaeffler Waelzlager Kg | Valve train for gas exchange valves of internal combustion engines |
| EP0908605A2 (en) * | 1997-10-09 | 1999-04-14 | Volkswagen Aktiengesellschaft | Valve operating system for internal combustion engines which can be disabled |
| DE19758372C2 (en) * | 1997-12-29 | 2002-08-29 | Ukm Umformtechnik Und Kraftfah | Pressure medium supply for an engine brake system of a multi-cylinder 4-stroke reciprocating piston internal combustion engine |
| EP1544423A2 (en) * | 2003-12-19 | 2005-06-22 | Delphi Technologies, Inc. | Roller finger follower assembly for valve deactivation |
| CN203962077U (en) * | 2014-07-30 | 2014-11-26 | 浙江师范大学 | A kind of changeable air valve for auxiliary braking |
-
2018
- 2018-03-27 CN CN201810260221.0A patent/CN108487961A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4128085A (en) * | 1976-05-17 | 1978-12-05 | Nissan Motor Company, Limited | Engine mechanical loss reducing system |
| US5544628A (en) * | 1994-07-06 | 1996-08-13 | Volkswagen Ag | Valve control arrangement for an internal combustion engine |
| DE19608651A1 (en) * | 1996-03-06 | 1997-09-11 | Schaeffler Waelzlager Kg | Valve train for gas exchange valves of internal combustion engines |
| EP0908605A2 (en) * | 1997-10-09 | 1999-04-14 | Volkswagen Aktiengesellschaft | Valve operating system for internal combustion engines which can be disabled |
| DE19758372C2 (en) * | 1997-12-29 | 2002-08-29 | Ukm Umformtechnik Und Kraftfah | Pressure medium supply for an engine brake system of a multi-cylinder 4-stroke reciprocating piston internal combustion engine |
| EP1544423A2 (en) * | 2003-12-19 | 2005-06-22 | Delphi Technologies, Inc. | Roller finger follower assembly for valve deactivation |
| CN203962077U (en) * | 2014-07-30 | 2014-11-26 | 浙江师范大学 | A kind of changeable air valve for auxiliary braking |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961917A (en) * | 2022-08-01 | 2022-08-30 | 龙口中宇热管理系统科技有限公司 | Rocker arm type valve control mechanism for dynamic cylinder closing of engine and engine |
| CN114961917B (en) * | 2022-08-01 | 2022-11-11 | 龙口中宇热管理系统科技有限公司 | Rocker arm type valve control mechanism for dynamic cylinder closing of engine and engine |
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Application publication date: 20180904 |