CN106368755A - Variable valve timing mechanism - Google Patents
Variable valve timing mechanism Download PDFInfo
- Publication number
- CN106368755A CN106368755A CN201610856873.1A CN201610856873A CN106368755A CN 106368755 A CN106368755 A CN 106368755A CN 201610856873 A CN201610856873 A CN 201610856873A CN 106368755 A CN106368755 A CN 106368755A
- Authority
- CN
- China
- Prior art keywords
- push rod
- valve
- cylinder
- rocking arm
- rocker arm
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
-
- 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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention relates to a variable valve timing mechanism. The variable valve timing mechanism comprises a valve and a valve transmission assembly. The valve transmission assembly comprises a camshaft, a push rod and a rocker arm. The middle portion of the rocker arm is hinged to a cylinder cover, the left end of the rocker arm abuts against the top of the valve, and the right end of the rocker arm abuts against the top of the push rod. The lower end of the push rod abuts against a cam of the cam shaft. The push rod is an automatic telescopic push rod. During operation, the camshaft rotates, the cam drives the push rod to move up and down, the left end of the rocker arm pushes the valve downwards to make the valve move downwards to open an air channel when the push rod pushes the rocker arm upwards to make the rocker arm swing anticlockwise, and the valve moves upwards along with uplifting of the left end of the rocker arm to close the air channel when the push rod falls to drive the rocker arm to swing clockwise; and when the push rod moves up and down, the upward stroke of the upper end of the push rod is changed by changing the expansion and contraction quantity of the push rod, and accordingly the valve opening and closing positions and the stroke are changed. According to the variable valve timing mechanism, valve lift can be adjusted and controlled in a stepless mode, the timing phase is made optimal all the time, and the performance of an engine is remarkably improved.
Description
Technical field
The present invention relates to a kind of engine valve valve actuating mechanism, the stepless adjustable valve of more particularly, to a kind of valve stroke is joined
Mechanism of qi structure.
Background technology
The effect of valve actuating mechanism is requirement, time opening and the closing according to engine firing order and the circulation of each cylinder working
Inlet and outlet door, makes live gass timely enter cylinder, waste gas discharges cylinder in time.Ideally wish the gas of turnover cylinder
Amount is just met for electromotor real-time working condition (including load, speed of service etc.) needs, makes electromotor play optimal performance.
But reality is: traditional valve actuating mechanism is made up of parts such as camshaft, tappet, push rod, rocking arm, valves,
The aperture of valve is determined by the lift of camshaft overhead cam it is impossible to adjust or continuous adjustment.After electromotor manufactures, distribution phase
Position has just immobilized it is impossible to adapt to the demand to intake and exhaust for the electromotor under different operating modes with valve stroke.Traditional electromotor
Designer adopts compromise proposal when considering cam profile, for example, should look after at a high speed also low speed to be considered.But it is this
Compromise proposal limits the performance of electromotor to a certain extent, exerts oneself and do not reach requirement during including low speed, and during high speed, power is full
Foot does not need, and far can not meet the requirement of present vehicular engine.
It can be seen that valve actuating mechanism affects the applying working condition of electromotor to a great extent.Each of electromotor operating condition
Suffer from each self-corresponding optimum operation parameter.For operating mode change situation, especially in city middle rolling car if it is possible to
Accomplish constantly to regulate and control, then greatly improved the performance of electromotor, thus reaching energy-conservation, economic effect.Accordingly it is desirable to
Can there is such a electromotor, no matter it needs be in which kind of operating mode, valve actuating mechanism can provide optimal distribution phase accordingly
Position.
Content of the invention
For solving the problems referred to above of prior art, the invention provides a kind of valve variable valve mechanism, this mechanism can
Stepless regulated valve stroke within the specific limits, makes port timing optimal in real time, makes electromotor be in optimal work shape in real time
State, significantly improves the performance of electromotor.
The main technical schemes of the present invention have:
A kind of valve variable valve mechanism, including valve and valve transmission component, described valve train assembly includes cam
Axle, push rod and rocking arm, the middle part of described rocking arm is hinged in cylinder head, and the left end of described rocking arm is against the top of described valve,
The right-hand member of described rocking arm is against the top of described push rod, and the lower end of described push rod is against on the cam of described camshaft, described pushes away
Bar is automatically retractable push rod, during work, described cam axle, and push rod described in described cam driven moves up and down, when described
When upwardly described rocking arm makes its counter-clockwise swing, the left end of described rocking arm pushes down on described valve makes valve descending to push rod
Open air flue, when described push rod falls and drives described rocking arm to make its clockwise oscillation, described valve is with described rocking arm left end
On carry on row and close air flue, during described push rod moves up and down, by changing the stroke of described push rod, change described
The up stroke of the upper end of push rod, thus change opened and closed positions and the stroke length of described valve.
Described push rod preferably installs the push rod of electric control hydraulic device thereon additional.
Described push rod can be the hydraulic cylinder of two-way electric control.
The electromagnetic valve that described push rod can include single-rod cylinder and control described single-rod cylinder commutation, described single pole liquid
The overhanging end of cylinder rod of cylinder pressure is connected with the right-hand member of described rocking arm, and the cylinder barrel of described single-rod cylinder is supported on described cam.
Described electromagnetic valve controls output signal end to electrically connect with the valve stroke of engine electric-controlled unit.
The right-hand member of described rocking arm can be connected with adjusting screw, and is fixed by adjusting nut, and the top of described push rod can
To be against in described adjusting screw.
The top of described push rod can be connected with the head oscillation of described adjusting screw.
The circumference of described push rod can be provided with mobile position limiting structure.
Described cylinder head is provided with the cylindricality air flue hole that one section of head with described valve is slidably matched, the head of described valve
Portion is from top to bottom inserted in described cylindricality air flue hole, and the lower end in described cylindricality air flue hole connects the combustor of cylinder.
The head outer diameter of described valve and/or described cylindricality air flue hole side wall can be circumferentially with sealing structure.
The invention has the beneficial effects as follows:
The valve actuating mechanism of the present invention is used in automobile engine, can be real-time and stepless change according to vehicle operational mode
The switching time of air valve variation and lift, therefore can significantly improve the performance of electromotor.
Because described push rod is the push rod having installed electric control hydraulic device thereon additional, realize the flexible of push rod by automatically controlled,
Therefore be very easy to realize the Programmed control of distribution, and real-time be good, be easy to include engine electric-controlled unit, in conjunction with load and
Closed loop control is realized in the detection of speed.
The present invention, by the precise control to air gate distribution phase place, significantly improves power performance and the fuel oil warp of electromotor
Ji property, regardless of the operating mode of electromotor, even the relatively more extreme big load of high speed and low speed small load condition, can make
Electromotor keeps highest operational efficiency, and not only fuel utilization ratio is high, decreases unnecessary exhaust emissions simultaneously.
The present invention achieves the step-less adjustment of valve switch moment and lift by same set of mechanism, and structure is simple, and
It is easily achieved, even transform on the basis of existing valve actuating mechanism being also easier.
Related independent regulation can be carried out using the valve actuating mechanism of the present invention to each cylinder it might even be possible to when needed
Close certain cylinder so that electromotor also can keep higher efficiency in Smaller load operation.
Brief description
Fig. 1 is the structural representation of one embodiment of the present of invention；
Fig. 2 is the valve excursion comparison sheet under present invention difference push rod length.
Specific embodiment
The invention discloses a kind of valve variable valve mechanism, as shown in Figure 1, 2, including valve 1 and valve transmission component,
Described valve train assembly includes camshaft, push rod 3 and Rocker arm 4, and rocker arm shaft hinged formation lever is passed through at the middle part of described rocking arm,
Described rocker arm shaft opposite cylinder heads 2 are fixing, and the left end of described rocking arm is against the top of described valve, and the right-hand member of described rocking arm is against
The top of described push rod, the lower end of described push rod is against on the cam 5 of described camshaft, and the top of described push rod moves up and down,
Drive described rocking arm to swing around rocker arm shaft, then drive valve to move up and down.Described push rod be automatically retractable push rod (vpr,
Variable push rod), during work, described cam axle, push rod described in described cam driven moves up and down, when described
When upwardly described rocking arm makes its counter-clockwise swing, the left end of described rocking arm pushes down on described valve makes valve descending to push rod
Open air flue, when described push rod falls and drives described rocking arm to make its clockwise oscillation, described valve is with described rocking arm left end
On carry on row and close air flue, during described push rod moves up and down, by changing the stroke of described push rod, change described
The up stroke of the upper end of push rod, thus change opened and closed positions and the stroke length of described valve.Using automatically retractable push rod
Make electromotor can have suitable port timing in the bigger range of speeds and load range, something which increases
The performance of electromotor.Described valve variable valve mechanism is used in automobile engine, can be according to vehicle operational mode, simultaneously simultaneously
And the real-time, switching time of stepless change valve and lift, make electromotor total energy keep higher work efficiency and power ratio, by
This significantly improves the performance of electromotor, and can also improve the utilization rate of fuel and the discharge reducing tail gas to a certain extent.
Described push rod preferably installs the push rod of electric control hydraulic device thereon additional, for example, can adopt the hydraulic pressure of two-way electric control
Cylinder.Specifically, the electromagnetic valve that described push rod can include single-rod cylinder and control described single-rod cylinder commutation, described single pole
The overhanging end of cylinder rod of hydraulic cylinder is connected with the right-hand member of described rocking arm, and the cylinder barrel of described single-rod cylinder is supported on described cam
On.
Described electromagnetic valve controls output signal end to electrically connect with the valve stroke of engine electric-controlled unit.Described can also connect
Connect velocity sensor and load sensor, during electromotor operating, engine electric-controlled unit can be sentenced according to the signal of each sensor
Break the need of changing valve switch moment and valve stroke, when changes are needed, send control signal to electromagnetic valve, by electricity
The stretching or contract and stroke size of push rod described in the action control of magnet valve.Push rod elongates or shortens, and has reached and change cam
The effect that molded line is similar to, thus improve engine performance.
The right-hand member of described rocking arm can be connected with adjusting screw 6, and is fixed by adjusting nut, and the top of described push rod is then
Can be against in described adjusting screw.Further, the head of described adjusting screw down, which is provided with the curved surface of indent, institute
The top stating push rod is against on this curved surface, or, the top of described push rod is provided with the curved surface of indent, the head of described adjusting screw
It is against on the described curved surface of push rod, realize being connected with the swing of the head of described adjusting screw.The top of described push rod with
The relative position of the right-hand member of described rocking arm can be finely adjusted by changing the position of adjusting screw.
The circumference of described push rod can be provided with mobile position limiting structure, constant with the axial location that ensures described push rod.For example
Similar to the prop column structure of traditional valve actuating mechanism, or or the bottom in described push rod and its peripheral structural member on
The feather key extending up and down is set, slot structure is realized.
Described gas cylinder head is provided with the cylindricality air flue hole that one section of head with described valve is slidably matched, described valve
Head is from top to bottom inserted in described cylindricality air flue hole, and the lower end in described cylindricality air flue hole connects the combustor of cylinder.The present invention
The side wall 7 (the side wall in cylindricality air flue hole) of straight pillar will be made around valve into it is ensured that when push rod length changes valve
Air tight.
Sealing structure can be circumferentially with the head outer diameter of described valve and/or described cylindricality air flue hole side wall, increase
Air-tightness.
Fig. 2 be the present invention different push rod length under the extreme higher position of valve and extreme lower position compare, described push rod elongation
Afterwards, the highest of valve and extreme lower position have moving down of certain amplitude, and during extreme lower position, the sectional area of gas channel substantially becomes
Greatly, can be used for high engine speeds operating mode, improve its power performance.It is true that because push rod is flexible and stroke is adjustable at any time, because
This not only extreme higher position of valve and extreme lower position real-time variable, and distance (the i.e. valve row of extreme higher position and extreme lower position
Journey) also variable at any time, thus drastically increase the motility of valve opening regulation.
The present invention can realize the stepless-adjustment of valve switch moment and lift within the specific limits by a set of mechanism simultaneously
Control, therefore, it is possible to better adapt to the various operating modes of electromotor.
Alleged by the present invention is the relative position expressing each several part for convenience up and down, does not constitute and the present invention is had
The restriction in the concrete orientation of body structure.
Claims (10)
1. a kind of valve variable valve mechanism, including valve and valve transmission component, described valve train assembly include camshaft,
Push rod and rocking arm, the middle part of described rocking arm is hinged in cylinder head, and the left end of described rocking arm is against the top of described valve, described
The right-hand member of rocking arm is against the top of described push rod, the lower end of described push rod be against on the cam of described camshaft it is characterised in that:
Described push rod is automatically retractable push rod, during work, described cam axle, and push rod described in described cam driven moves up and down,
When upwardly described rocking arm makes its counter-clockwise swing to described push rod, the left end of described rocking arm pushes down on described valve makes gas
The descending unlatching air flue of door, when described push rod falls and drives described rocking arm to make its clockwise oscillation, described valve shakes with described
Row is carried on arm left end and closes air flue, during described push rod moves up and down, by changing the stroke of described push rod, change
Become the up stroke of the upper end of described push rod, thus changing opened and closed positions and the stroke length of described valve.
2. valve variable valve mechanism as claimed in claim 1 it is characterised in that: described push rod is to install electric-controlled hydraulic thereon additional
The push rod of device.
3. valve variable valve mechanism as claimed in claim 2 it is characterised in that: described push rod is the hydraulic pressure of two-way electric control
Cylinder.
4. valve variable valve mechanism as claimed in claim 3 it is characterised in that: described push rod includes single-rod cylinder and control
Make the electromagnetic valve of described single-rod cylinder commutation, the cylinder rod end of described single-rod cylinder is connected with the right-hand member of described rocking arm, institute
The cylinder barrel stating single-rod cylinder is supported on described cam.
5. valve variable valve mechanism as claimed in claim 4 it is characterised in that: described electromagnetic valve and engine electric-controlled unit
Valve stroke control output signal end electrical connection.
6. valve variable valve mechanism as claimed in claim 5 it is characterised in that: the right-hand member of described rocking arm is connected with adjustment spiral shell
Nail, and fixed by adjusting nut, the top of described push rod is against in described adjusting screw.
7. valve variable valve mechanism as claimed in claim 6 it is characterised in that: the top of described push rod and described adjustment spiral shell
The head oscillation of nail is connected.
8. valve variable valve mechanism as claimed in claim 7 it is characterised in that: described push rod be circumferentially with movement spacing
Structure.
9. the valve variable valve mechanism as described in claim 1,2,3,4,5,6,7 or 8 it is characterised in that: described cylinder head
It is provided with the cylindricality air flue hole that one section of head with described valve is slidably matched, the head of described valve is from top to bottom inserted in described
In cylindricality air flue hole, the lower end in described cylindricality air flue hole connects the combustor of cylinder.
10. valve variable valve mechanism as claimed in claim 9 it is characterised in that: the head outer diameter of described valve and/or institute
State cylindricality air flue hole side wall and be circumferentially with sealing structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610856873.1A CN106368755A (en) | 2016-09-27 | 2016-09-27 | Variable valve timing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610856873.1A CN106368755A (en) | 2016-09-27 | 2016-09-27 | Variable valve timing mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106368755A true CN106368755A (en) | 2017-02-01 |
Family
ID=57897094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610856873.1A Pending CN106368755A (en) | 2016-09-27 | 2016-09-27 | Variable valve timing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106368755A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107387190A (en) * | 2017-08-31 | 2017-11-24 | 吉林大学 | A kind of swing type variable valve driving apparatus |
| CN109667638A (en) * | 2018-12-28 | 2019-04-23 | 潍柴动力股份有限公司 | Valve control apparatus and engine |
| CN111456828B (en) * | 2020-04-23 | 2021-04-16 | 浙江精湛化油器有限公司 | Valve lift adjustable device based on connecting rod transmission principle |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4796573A (en) * | 1987-10-02 | 1989-01-10 | Allied-Signal Inc. | Hydraulic engine valve lifter assembly |
| US20080196684A1 (en) * | 2007-02-15 | 2008-08-21 | Rozario Frederick J | Hydraulic lash adjuster |
| CN101315036A (en) * | 2007-05-29 | 2008-12-03 | 福特环球技术公司 | Engine with double-push bar tappet rod and stand-alone interstice regulator, and air valve mechanism thereof |
| CN102472124A (en) * | 2009-08-07 | 2012-05-23 | 雅各布斯车辆***公司 | Lost motion variable valve actuation system with valve catch piston |
| CN203130181U (en) * | 2013-01-14 | 2013-08-14 | 浙江师范大学 | Novel adjustable hydraulic tappet |
| CN103925037A (en) * | 2013-01-14 | 2014-07-16 | 浙江师范大学 | Novel adjustable hydraulic tappet |
| CN204804893U (en) * | 2014-01-12 | 2015-11-25 | 伊顿公司 | A engine roller tappet for among explosive motor's valve timing mechanism |
| CN204877574U (en) * | 2015-06-29 | 2015-12-16 | 上海高斯通船舶配件有限公司 | Explosive motor fluid pressure type valve lift adjusts buffer |
-
2016
- 2016-09-27 CN CN201610856873.1A patent/CN106368755A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4796573A (en) * | 1987-10-02 | 1989-01-10 | Allied-Signal Inc. | Hydraulic engine valve lifter assembly |
| US20080196684A1 (en) * | 2007-02-15 | 2008-08-21 | Rozario Frederick J | Hydraulic lash adjuster |
| CN101315036A (en) * | 2007-05-29 | 2008-12-03 | 福特环球技术公司 | Engine with double-push bar tappet rod and stand-alone interstice regulator, and air valve mechanism thereof |
| CN102472124A (en) * | 2009-08-07 | 2012-05-23 | 雅各布斯车辆***公司 | Lost motion variable valve actuation system with valve catch piston |
| CN203130181U (en) * | 2013-01-14 | 2013-08-14 | 浙江师范大学 | Novel adjustable hydraulic tappet |
| CN103925037A (en) * | 2013-01-14 | 2014-07-16 | 浙江师范大学 | Novel adjustable hydraulic tappet |
| CN204804893U (en) * | 2014-01-12 | 2015-11-25 | 伊顿公司 | A engine roller tappet for among explosive motor's valve timing mechanism |
| CN204877574U (en) * | 2015-06-29 | 2015-12-16 | 上海高斯通船舶配件有限公司 | Explosive motor fluid pressure type valve lift adjusts buffer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107387190A (en) * | 2017-08-31 | 2017-11-24 | 吉林大学 | A kind of swing type variable valve driving apparatus |
| CN107387190B (en) * | 2017-08-31 | 2023-10-27 | 吉林大学 | Swing type variable valve driving device |
| CN109667638A (en) * | 2018-12-28 | 2019-04-23 | 潍柴动力股份有限公司 | Valve control apparatus and engine |
| CN111456828B (en) * | 2020-04-23 | 2021-04-16 | 浙江精湛化油器有限公司 | Valve lift adjustable device based on connecting rod transmission principle |
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170201 |