CN104895634A - Continuous variable timing device - Google Patents
Continuous variable timing device Download PDFInfo
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- CN104895634A CN104895634A CN201510372239.6A CN201510372239A CN104895634A CN 104895634 A CN104895634 A CN 104895634A CN 201510372239 A CN201510372239 A CN 201510372239A CN 104895634 A CN104895634 A CN 104895634A
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Abstract
The invention relates to a continuous variable timing device. The continuous variable timing device comprises a hollow camshaft, an internal camshaft and two intake valve cams. The internal camshaft is mounted in the hollow camshaft through a bearing; a first intake valve cam consists of a first adjustable cam and a first fixed cam; the first adjustable cam is mounted on the internal camshaft through a second fixing pin, and the first fixed cam is mounted on the hollow camshaft; a second intake valve cam consists of a second adjustable cam and a second fixed cam; the second adjustable cam is mounted on the internal camshaft through a first fixing pin, and the second fixing cam is mounted on the hollow camshaft. Compared with a traditional 0-30-degree valve continuous adjustment mechanism, the continuous variable timing device has the advantages of wide adjustment range and high reliability; compared with a current mostly advanced Toyota VVL (variable valve lift) system, the continuous variable timing device has the advantages of simplification of an adjustment mechanism, simple structure, small space occupancy, applicability to low-powered engines, reduction of production cost and easiness for popularization and utilization.
Description
Technical field
The present invention relates to a kind of internal-combustion engine variable advance/retard mechanism, especially a kind of assembled camshaft variable timing device.
Background technique
In recent decades, based on the requirement improving motor car engine power character, Economy and reduction blowdown, many countries and motor manufacturer, scientific research institution have dropped into the research and development that a large amount of human and material resources carry out new technology.At present, these new technology and methods, what have is applied on internal-combustion engine, and some is in the development and improvement stage.In current internal-combustion engine using process, the closedown & of valve opens a part for the working state as internal-combustion engine, in order to reach optimized valve control mode, artificer expects to arrange according to different demands to beat the intake & exhaust valves door opening or closing motor.Variable Valve Timing Technique of IC Engine (VVT, Variavle Valve Timing) be in the last few years by the one in the new technology that is applied to gradually in Modern Car, it can regulate continuously the valve opening of motor, shut-in time and air inflow, volumetric efficiency is increased, thus can engine power be improved, optimize torque curve, the power character of improving product, reduction oil consumption, the advantage that variable gas distribution technology is brought is apparent, and the standard progressively becoming advanced motor is equipped with by this technology.Universal along with this technology, has been provided on most of prevailing engine now, the motor not being equipped with this technology in most of field by the verge of being replaced.
Usual valve is driven by camshaft by the bent axle of motor, and the valve timing of valve depends on the corner of camshaft.On common motor, the opening/closing time of intake valve and exhaust valve is changeless, and this changeless timing is difficult to the work requirements taking into account motor different rotating speeds, and Variable Valve Time is exactly the technology solving this contradiction.When engine running, we need to allow more fresh air enter into firing chamber, allow waste gas can discharge firing chamber as much as possible, and best solution allows intake valve open in advance exactly, allow exhaust valve postpone and close.Like this, between intake stroke and exhaust stroke, the situation that intake valve and exhaust valve are opened simultaneously will occur, and the overlap between this inlet and exhaust valve is called as valve superposition angle.When motor is in different rotating speeds, the requirement of valve superposition angle is also different.Arranging without any a kind of fixing valve superposition angle to allow motor can perfectly export when highland rotating speed, if do not have Variable Valve Timing, motor can only mate the demand of vehicle according to it, selects optimized fixing valve superposition angle.Such as, the motor of racing car generally all adopts less valve superposition angle, to be conducive to Power output when high rotating speed.Common civilian vehicle then adopts moderate valve superposition angle, takes into account at a high speed and Power output that low speed is simultaneously, but can lose a lot of power when the slow-speed of revolution and high rotating speed.And Variable Valve Timing, be exactly by technological means, realize the variable of valve superposition angle and solve this contradiction.
Have employed Variable Valve Timing, the power of motor and torsion export will be more linear, and take into account the Power output of high and low rotating speed, the rotating speed of such motor can design get Geng Gao, thus obtains more power stage simultaneously; Have employed Variable Valve Timing simultaneously, motor can increase torsion and export when the slow-speed of revolution, greatly strengthen the yarage of driving, while motor adopts Variable Valve Timing to obtain above-mentioned benefit, without any negative effect, in other words, be exactly higher requirement is not proposed for the working strength of motor.In whole variable gas distribution technical field, it is by hydraulic pressure and gear drive, according to motor need adjust camshaft phase, achieve dynamic adjustments valve timing.Need a set of hydraulic pressure installation and solenoid valve, hydraulic control cylinder is connected with high-pressure oil passage, so piston can move to camshaft direction, the thing followed is that the corner of camshaft can continuous variable phase angle by advance more high performance variable valve timing VVT system, according to the difference of rotating speed, in the linearly instruction port timing of 0 degree of-30 degree, its shortcoming is that Hydraulic System Reliability is vulnerable to pollutant interference and cannot changes the valve opening and closing endurance
State-of-the-art VVT system in the VVTL-I Shi Shi world today of current Toyota, its powerful function comprises: continuous variable valve timing, point two sections of changeable air valve strokes and tjic valve-open duration and intake and exhaust are all variable, this cover Variable Valve Time is also according to the parameter such as rotating speed, acceleration, upward slope, descending of motor by the management system of motor, calculate suitable valve timing, and controlled by the hydraulic mechanism being arranged in tail end of camshaft.In addition its phase angle can within the scope of 0-60 degree continuous variable.Therefore valve timing can with the work perfect matching of motor.This cover system of Toyota have employed one group of rocking arm design, and it is (or exhaust valve) between two intake valves.It also has two difform cams to drive rocking arm, and there is different shapes its cross-section, and one has longer valve opening time (during for high rotating speed), and another has shorter valve opening time (during for the slow-speed of revolution).When the slow-speed of revolution, Lower speed cam drives rocker motion (in order to reduce surface friction drag) by rolling bearing.During high rotating speed, owing to leaving enough gaps between this cam and hydraulic mandril below, cannot Direct driver rocking arm.When rotating speed is increased to the limit time, slide block, under the effect of hydraulic pressure, is pulled in the gap of hydraulic mandril.High speed cam starts effective work.Under the driving of High speed cam, the endurance of valve opening is longer, and now stroke also longer (just as the VTEC of Honda, valve opening stroke and open the shape that the endurance all depends on camshaft).But its shortcoming is also fairly obvious: structure is also complexity extremely, and cost is high, on a large amount of cost manufacturing process, the continuous running of guarantee whole system.
Summary of the invention
The technical problem to be solved in the present invention is: propose a kind of continuous variable advance/retard mechanism, and reliability that current hydraulic mechanism controls is relatively poor to utilize assembled camshaft to solve, the complicated and problem that cost is high of high-performance continuous variable advance/retard mechanism mechanism.
The technical solution adopted in the present invention is: a kind of continuous variable advance/retard mechanism, comprises hollow camshaft, built-in convex wheel shaft, No. 1 inlet valve cam, No. 2 inlet valve cams; Described built-in convex wheel shaft is arranged in hollow cam by bearing; No. 1 described intake cam is made up of adjustable type cam and stationary cam; Described adjustable intake cam is arranged on built-in convex wheel shaft by the second fixing pin, and stationary cam is arranged on hollow cam; No. 2 described inlet valve cams are made up of another adjustable type cam and another stationary cam; Another described adjustable intake cam is arranged on built-in convex wheel shaft by the first fixing pin, and another stationary cam is arranged on hollow cam.
Further, built-in convex wheel shaft of the present invention and hollow camshaft do the rotation that relative angle is 0 ~ 70 degree.Built-in convex wheel shaft of the present invention is provided with turbine, realizes doing with hollow camshaft the rotation that relative angle is 0 ~ 70 degree under the drive of worm screw.
Further say, worm screw of the present invention moves clockwise, and drives turbine rotation, and turbine drives built-in convex wheel shaft to rotate clockwise; Worm screw is motion counterclockwise, drives turbine rotation, and turbine drives built-in convex wheel shaft to rotate counterclockwise.
The invention has the beneficial effects as follows: compare 0 ~ 30 degree of traditional valve continuously adjustabe controlling mechanism, its adjustable extent is larger, and its reliability is stronger; Compared with current state-of-the-art Toyota VVL system, this invention simplifies controlling mechanism, structure structure is simple, takes up room little, can be applied in the motor of small displacement, significantly reduce cost of production, be easy to promote the use of.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is structural representation of the present invention;
Fig. 1-1 is the partial enlarged drawing at I place in Fig. 1;
Fig. 2 be cold start-up and idling operation time intake valve and exhauxt valve opens moment schematic diagram;
Fig. 3 is engine speed (>1300rpm) intake valve and exhauxt valve opens moment schematic diagram when being in high speed;
Fig. 4 is engine speed (>3600r/min) intake valve and exhauxt valve opens moment schematic diagram when being in high speed;
Fig. 5 is the structural representation of another embodiment of the present invention;
In figure: 1-hollow camshaft; 2-1 inlet valve cam; 21-adjustable type cam; 22-stationary cam; 3-2 inlet valve cam; Another adjustable type cam of 31-; Another stationary cam of 32-; 4-built-in convex wheel shaft; 5-first fixing pin; 6-second fixing pin; 7-turbine; 8-worm screw; CRA-camshaft degree; TDC-engine tope center; H-valve lift.
Embodiment
The present invention is further detailed explanation with preferred embodiment by reference to the accompanying drawings now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
As shown in Fig. 1 and Fig. 1-1, a kind of continuous variable advance/retard mechanism, comprise hollow camshaft 1, built-in convex wheel shaft 4, No. 1 inlet valve cam 2, described No. 1 intake cam 2 is made up of adjustable type cam 21 and stationary cam 22, and adjustable intake cam 21 is arranged on built-in convex wheel shaft 4 by the second fixing pin 6 and No. 2 inlet valve cams 3 by the first fixing pin 5, and stationary cam 22 is arranged on hollow cam 1; No. 2 inlet valve cams 3, built-in convex wheel shaft 4 is arranged in hollow cam 1 by bearing; Described built-in convex wheel shaft 4 is provided with turbine 7, can realize can doing with hollow camshaft 1 rotation that relative angle is 0 ~ 70 degree under the drive of worm screw 8.
As shown in Figure 5, this continuous variable advance/retard mechanism, its No. 2 inlet valve cams 3 also can make compound cam structure, be made up of another adjustable type cam 31 and another stationary cam 32, another adjustable cam 31 is by fixing pin built-in convex wheel shaft 4, and another stationary cam 32 is arranged on hollow cam 1.
Now be applied to engine intake valve for this continuous variable advance/retard mechanism, sketch its working procedure:
Adopt variable valve timing mechanism can improve the performance of motor.Engine speed is different, requires different valve timings.When engine speed changes, because the waste gas flow velocity in induction air flow ratio and forced exhaust period also changes thereupon, therefore during valve closes evening, utilize flow inertance to increase air inlet and promote that the effect of exhaust will be different.
As shown in Figure 2, when motor is in the cold start-up and idling operation that are less than 1300rpm, now worm screw 8 moves clockwise, and drive turbine 7 to rotate, turbine 7 drives built-in convex wheel shaft 4 to rotate clockwise, such camshaft 4 turns over several angle θ clockwise with hollow camshaft 1, intake valve angle of advanced opening degree diminishes, and the overlapping angle being in intake valve under cold start-up and idling operation and exhaust valve is minimum, and the fuel concentration of demand is minimum, combustion stability is better, and time of engine low speed is steady; Because motor has 3 cylinders or 4 cylinders usually, therefore, the EX1 in Fig. 2 represents certain cylinder first row valve of motor, and EX2 represents certain cylinder second row valve of motor; IN1 represents certain cylinder first intake valve of motor, and IN2 represents certain cylinder second intake valve of motor.
As shown in Figure 3, when engine speed is higher than 1300r/min, now worm screw 8 counterclockwise motion, drive turbine 7 to rotate, turbine 7 drives built-in convex wheel shaft 4 to rotate counterclockwise, and such camshaft 4 turns over several angle θ counterclockwise with hollow camshaft 1, intake valve angle of advanced opening degree becomes large, the overlapping angle of inlet and outlet door becomes large, and waste gas discharge rate strengthens, and improves volumetric efficiency and torque value.EX1 in Fig. 3 represents certain cylinder first row valve of motor, and EX2 represents certain cylinder second row valve of motor; IN1 represents certain cylinder first intake valve of motor, and IN2 represents certain cylinder second intake valve of motor.
As shown in Figure 4, when engine speed is higher than 3600r/min, worm screw 8 drives turbine 7 to reset, and regulate end-of-job, intake valve gets back to again the position do not shifted to an earlier date, intake valve is opened and closes angle increasing evening evening, valve overlap is relatively little, can utilize the inertia energy of gas, increases air inflow and reduces residual waste gas quantity, the gas exchange process of motor is reached perfection, improves performance number.EX1 in Fig. 4 represents certain cylinder first row valve of motor, and EX2 represents certain cylinder second row valve of motor; IN1 represents certain cylinder first intake valve of motor, and IN2 represents certain cylinder second intake valve of motor.
The feature of Variable Valve Time gear is the morning and evening and the air inflow that only change the intake valve open and close time, port timing angle value constant (time translation-namely early open, early pass; Evening opens, evening closes), do not change the size of intake valve lift.
The present invention, according to the difference of motor, can apply to four kinds of structures of present engine continuous variable VVT respectively: only regulate intake cam phase place; Only regulate exhaust phase place; Intake and exhaust phase place regulates simultaneously; The two independent phase of intake and exhaust regulates.
The just the specific embodiment of the present invention described in above specification, various illustrating is not construed as limiting flesh and blood of the present invention, person of an ordinary skill in the technical field after having read specification can to before described embodiment make an amendment or be out of shape, and do not deviate from essence of an invention and scope.
Claims (5)
1. a continuous variable advance/retard mechanism, is characterized in that: comprise hollow camshaft (1), built-in convex wheel shaft (4), No. 1 inlet valve cam (2), No. 2 inlet valve cams (3); Described built-in convex wheel shaft (4) is arranged in hollow cam (1) by bearing; No. 1 described intake cam (2) is made up of adjustable type cam (21) and stationary cam (22); Described adjustable intake cam (21) is arranged on built-in convex wheel shaft (4) by the second fixing pin (6), and stationary cam (22) is arranged on hollow cam (1); No. 2 described inlet valve cams (3) are made up of another adjustable type cam (31) and another stationary cam (32); Another described adjustable intake cam (31) is arranged on built-in convex wheel shaft (4) by the first fixing pin (5), and another stationary cam (32) is arranged on hollow cam (1).
2. a kind of continuous variable advance/retard mechanism as claimed in claim 1, is characterized in that: described built-in convex wheel shaft (4) and hollow camshaft (1) do the rotation that relative angle is 0 ~ 70 degree.
3. a kind of continuous variable advance/retard mechanism as claimed in claim 2, it is characterized in that: described built-in convex wheel shaft (4) is provided with turbine (7), realize doing with hollow camshaft (1) rotation that relative angle is 0 ~ 70 degree under the drive of worm screw (8).
4. a kind of continuous variable advance/retard mechanism as claimed in claim 3, it is characterized in that: described worm screw (8) moves clockwise, drive turbine (7) to rotate, turbine (7) drives built-in convex wheel shaft (4) to rotate clockwise.
5. a kind of continuous variable advance/retard mechanism as claimed in claim 3, it is characterized in that: described worm screw (8) is motion counterclockwise, drive turbine (7) to rotate, turbine (7) drives built-in convex wheel shaft (4) to rotate counterclockwise.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510372239.6A CN104895634A (en) | 2015-06-30 | 2015-06-30 | Continuous variable timing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510372239.6A CN104895634A (en) | 2015-06-30 | 2015-06-30 | Continuous variable timing device |
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| CN104895634A true CN104895634A (en) | 2015-09-09 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4771742A (en) * | 1986-02-19 | 1988-09-20 | Clemson University | Method for continuous camlobe phasing |
| EP0472430A2 (en) * | 1990-08-23 | 1992-02-26 | Ricardo Consulting Engineers Limited | Valve gear for internal combustion engines |
| CN1357079A (en) * | 1998-01-19 | 2002-07-03 | 达勒脱控股有限公司 | Cam and cam followers for engines |
| CN1573032A (en) * | 2003-05-22 | 2005-02-02 | 日产自动车株式会社 | Variable valve control system and method for an internal combustion engine |
| US20090314235A1 (en) * | 2008-06-18 | 2009-12-24 | Gm Global Technology Operations, Inc. | Hydraulic Control System for Engine Cam Phasing |
| CN102667078A (en) * | 2009-11-25 | 2012-09-12 | 丰田自动车株式会社 | Variable valve device for internal combustion engine |
| CN204716322U (en) * | 2015-06-30 | 2015-10-21 | 常州机电职业技术学院 | A kind of continuous variable advance/retard mechanism |
-
2015
- 2015-06-30 CN CN201510372239.6A patent/CN104895634A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4771742A (en) * | 1986-02-19 | 1988-09-20 | Clemson University | Method for continuous camlobe phasing |
| EP0472430A2 (en) * | 1990-08-23 | 1992-02-26 | Ricardo Consulting Engineers Limited | Valve gear for internal combustion engines |
| CN1357079A (en) * | 1998-01-19 | 2002-07-03 | 达勒脱控股有限公司 | Cam and cam followers for engines |
| CN1573032A (en) * | 2003-05-22 | 2005-02-02 | 日产自动车株式会社 | Variable valve control system and method for an internal combustion engine |
| US20090314235A1 (en) * | 2008-06-18 | 2009-12-24 | Gm Global Technology Operations, Inc. | Hydraulic Control System for Engine Cam Phasing |
| CN102667078A (en) * | 2009-11-25 | 2012-09-12 | 丰田自动车株式会社 | Variable valve device for internal combustion engine |
| CN204716322U (en) * | 2015-06-30 | 2015-10-21 | 常州机电职业技术学院 | A kind of continuous variable advance/retard mechanism |
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Application publication date: 20150909 |