CN205654389U - Piezoelectricity driven does not have camshaft valve actuating mechanism - Google Patents
Piezoelectricity driven does not have camshaft valve actuating mechanism Download PDFInfo
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- CN205654389U CN205654389U CN201620321327.3U CN201620321327U CN205654389U CN 205654389 U CN205654389 U CN 205654389U CN 201620321327 U CN201620321327 U CN 201620321327U CN 205654389 U CN205654389 U CN 205654389U
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- valve
- piston
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- actuating mechanism
- camshaft
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- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 230000006399 behavior Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008450 motivation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
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Abstract
The utility model relates to a piezoelectricity driven does not have camshaft valve actuating mechanism, it can realize opening right time the engine valve, opens the nimble control of lift, and the system response time is short, and the valve is taken a seat and is strikeed for a short time, and spiracular motion curve can freely be controlled in on a large scale, satisfies the demand of engine different work condition and various novel combustion technologies. A piezoelectricity driven does not have camshaft valve actuating mechanism, includes piezo -actuator, the transmission piece, and big piston and valve piston on the pneumatic cylinder are installed to the pneumatic cylinder to and big piston of quilt and little piston packaging's hydraulic pressure chamber, with continuous check valve and the accumulator in hydraulic pressure chamber. When the needs valve was opened, piezo -actuator was under the high voltage effect of input, and the anamorphic stretching produces less displacement and promotes big piston motion compression hydraulic pressure chamber, and the promotion valve piston produces sufficient stroke and opens with drive power messenger valve. When needs valve closure, piezo -actuator's input voltage is lower, and valve return under the valve spring effect is taken a seat.
Description
Technical field
This utility model relates to a kind of engine valve actuating mechanism, specifically electromotor without camshaft valve actuating mechanism, refers in particular to one
The valve actuating mechanism without camshaft of Piezoelectric Driving.
Background technology
The service behaviour of engine valve actuating mechanism suffers from very important for the dynamic property of electromotor, economy, emission performance etc.
Impact, under different engine behaviors, required optimal valve timing, air inflow etc. is all different.And
Traditional cam axle type valve actuating mechanism is single due to valve timing, and valve stroke is fixed, and can only meet and send out under a certain duty
The requirement that motivation service behaviour is optimal, and under other operating modes, cam axle type valve actuating mechanism cannot make the service behaviour of electromotor reach
To optimum.Therefore, in order to improve electromotor service behaviour under different operating modes, enter on the basis of cam axle type valve actuating mechanism
Row improves, and has obtained variable valve actuator for air.
Variable valve actuator for air improves the service behaviour of electromotor under different operating mode, in all variable valve actuator for air, to valve
Valve timing and unlatching lift variable range maximum, be without camshaft valve actuating mechanism.Current valve actuation without camshaft
Mechanism, mostly uses electromagnetic valve, controls hydraulic oil and drives piston, and then drives valve event.By the electromagnetic valve opening and closing moment
Difference, the difference of working cycle, obtain different valve opening timings and valve stroke.But in such systems, hydraulic oil flow
Going out, during air valve drop, impact is very big, and valve crash speed is difficult to be controlled by electromagnetic valve, is only dropped by modes such as throttlings
Low impact of taking a seat, whole system is more complicated, it addition, major part is difficulty with valve portion separately without camshaft valve actuating mechanism
Opening and keep this lift, this purpose to be realized must use increasingly complex, and the most accurate drive mechanism reduces system
Functional reliability, improve complete machine cost simultaneously.
Summary of the invention
The purpose of this utility model is to propose the valve actuating mechanism without camshaft of a kind of Piezoelectric Driving.Piezoelectricity is controlled by ECU
Driver promotes big descent of piston, the fluid in compression hydraulic chamber, utilizes big piston different with the diameter of valve piston on valve piston
Obtain the many times of driving strokes amplified, push directly on valve opening；When the voltage that ECU controls input piezoelectric actuator reduces,
Piezoelectric actuator shortens, and valve is return under the effect of valve spring, promotes valve piston up, and the biggest piston is in Piezoelectric Driving
Under device input voltage effect, control the seating velocity of valve, reduce impact of taking a seat.Therefore, defeated to piezoelectric actuator by ECU
Enter the adjustment of voltage, valve timing, valve stroke can be controlled flexibly, obtain parameter changeable, the valve operation of reliable operation
Curve, preferably meets electromotor work requirements.
The technical scheme realizing this utility model purpose is as follows:
It is provided with the valve actuating mechanism without camshaft of a kind of Piezoelectric Driving, comprises hydraulic cylinder, accumulator, check valve, big O shape close
Seal, big piston, drive block, piezoelectric actuator, little O-ring seals, valve piston；It is characterized in that described big O shape is close
Seal is contained in Radix Angelicae Dahuricae (Radix Heraclei Scabridi) beyond the Great Wall, and described little O-ring seals is contained on valve piston, and big piston and valve piston are contained on hydraulic cylinder, greatly
The hydraulic cavities sealed between piston and valve piston, hydraulic cavities is connected with accumulator by check valve, piezoelectric actuator and transmission
Block is in close contact, and the drive block other end and Radix Angelicae Dahuricae (Radix Heraclei Scabridi) plug are in close contact, and valve piston is in close contact with valve, big piston and valve piston two
The diameter of person determines than by the impulse stroke of piezoelectric actuator and the maximum opening of valve.
The input voltage of piezoelectric actuator is controlled by ECU ECU, freely can regulate according to electromotor job demand.
Big sealing No leakage between piston and hydraulic cylinder, has micro-leakage between valve piston and hydraulic cylinder.
Accumulator operating pressure is relatively low, is only used for ensureing that big piston is in close contact with drive block all the time, and valve piston is tight with valve all the time
Contiguity is touched.
Accompanying drawing explanation
Fig. 1 is the structural representation of the valve actuating mechanism without camshaft of a kind of Piezoelectric Driving of the present utility model.
Mark explanation in accompanying drawing: 1-valve 2-valve spring 3-valve piston 4-hydraulic cylinder 5-accumulator 6-is mono-
Little to valve 7-big O-ring seals 8-big piston 9-drive block 10-piezoelectric actuator 11-hydraulic cavities 12-
O-ring seals
Detailed description of the invention
With reference to accompanying drawing, an embodiment of the present utility model is described in detail.
As it is shown in figure 1, the valve actuating mechanism without camshaft of a kind of Piezoelectric Driving comprises hydraulic cylinder (4), is arranged on hydraulic cylinder (4)
On check valve (6), the accumulator being connected with one-way valved outlet (5), be arranged on the big piston (8) of hydraulic cylinder (4) one end,
Equipped with big O-ring seals (7) to ensure to reliably seal No leakage on it, it is arranged on the valve piston (3) of hydraulic cylinder (4) other end,
Equipped with little O-ring seals (12) on it, between valve piston (3) and hydraulic cylinder (4), there is micro-leakage, to compensate valve heat
Swollen shrinkage, piezoelectric actuator (10), by ECU control, is in close contact with big piston (8) by drive block (9), valve piston
(3) it is in close contact with valve (1), valve (1) is provided with valve spring (2), at big piston (8) and valve piston (3)
Between the hydraulic cavities (11) that sealed, communicated with accumulator (5) internal low-voltage fluid by check valve (6).
When valve (1) is closed, the voltage that ECU controls input piezoelectric actuator (10) is relatively low, piezoelectric actuator (10)
Elongation less, hydraulic cavities (11) interior pressure is relatively low, and check valve (6) is closed, and drive block (9) and big piston (8) are tight
Contiguity is touched, and valve piston (3) is in close contact with valve (1), but pressure is much smaller than the active force of valve spring (2).
When needs valve (1) is opened, the voltage that ECU controls input piezoelectric actuator (10) is higher, piezoelectric actuator (10)
Anamorphic stretching, promotes big piston (8) to produce less displacement, compression hydraulic chamber (11), hydraulic cavities (11) by drive block (9)
Interior pressure raises, thus the thrust of valve (1) is increased by valve piston (3), overcomes the active force of valve spring (2), makes gas
Door is opened.Diameter due to big piston (8) is much larger than the diameter of valve piston (3), and therefore the stroke of valve piston (3) is much larger than
The displacement of big piston (8), and, the fast response time of piezoelectric actuator (10), during anamorphic stretching, driving force is big, displacement essence
Degree height, therefore can accurately control the displacement of big piston (8), and then controls the stroke of valve piston (3), i.e. valve (1)
Aperture.
When needs valve (1) part is opened, as long as controlled the voltage of input piezoelectric actuator (10), piezoelectricity by ECU
The anamorphic stretching amount of driver (10) suitably shortens, so that the displacement of big piston (8) suitably reduces, and now valve piston (3)
Valve (1) part can be made to open.
When valve (1) opens predetermined aperture, ECU keeps the voltage inputting piezoelectric actuator (10) constant, then piezoelectricity
The anamorphic stretching amount of driver (10) is constant, and big piston (8) and valve piston (3) are held at respective position, valve (1)
Keep current aperture constant, it is thus achieved that bigger time face amount.
When needs valve (1) is closed, ECU controls the voltage of input piezoelectric actuator (10) and is gradually lowered, then piezoelectricity drives
The anamorphic stretching amount of dynamic device (10) is gradually reduced, and now valve (1) is under the effect of valve spring (2), promotes valve piston
(3) return, valve piston (3) compression hydraulic chamber (11), promote big piston (8) to return to initial position, obtain suitably simultaneously
Seating velocity and relatively low impact of taking a seat.
Owing to big piston (8) and drive block (9) are in close contact all the time, valve piston (3) is in close contact all the time with valve (1),
And when electromotor be in cold conditions and hot time, each mechanism and valve (1) etc. have certain thermal deformation, therefore, in valve piston (3)
And have micro-leakage between hydraulic cylinder (4), when valve (1) temperature raises size increase, by valve piston (3) and hydraulic pressure
The deflection of valve (1) is compensated by the micro-leakage between cylinder (4), keeps system working stability.When electromotor works
State changes, when valve (1) temperature reduces size reduction, under valve (1) closed mode, and hydraulic cavities (11) interior pressure
Less than accumulator (5) interior pressure, a small amount of fluid flows into hydraulic cavities (11), the deformation to valve (1) through check valve (6)
Amount compensates.In normal operation, between valve piston (3) and hydraulic cylinder (4) fluid of micro-leakage also by
The method is supplemented.
Above in conjunction with accompanying drawing, this utility model is exemplarily described, it is clear that this utility model implements not by above-mentioned side
The restriction of formula, as long as have employed method of the present utility model design and the various improvement that carry out of technical scheme, or the most improved directly
It is applied to other occasions, all within protection domain of the present utility model.
Claims (4)
1. the valve actuating mechanism without camshaft of a Piezoelectric Driving, comprises hydraulic cylinder (4), accumulator (5), check valve (6), big
O-ring seals (7), big piston (8), drive block (9), piezoelectric actuator (10), little O-ring seals (12), little work
Plug (3)；It is characterized in that described big O-ring seals (7) is contained on big piston (8), described little O-ring seals (12)
Being contained on valve piston (3), big piston (8) and valve piston (3) are contained in hydraulic cylinder (4), big piston (8) and valve piston
(3) hydraulic cavities (11) sealed between, hydraulic cavities (11) is connected with accumulator (5) by check valve (6), pressure
Electric drive (10) and drive block (9) are in close contact, and drive block (9) other end and big piston (8) are in close contact, little work
Plug (3) is in close contact with valve (1), and big piston (8) and both diameter ratios of valve piston (3) are by piezoelectric actuator (10)
Impulse stroke and valve (1) maximum opening determine.
The valve actuating mechanism without camshaft of a kind of Piezoelectric Driving the most according to claim 1, it is characterised in that piezoelectric actuator (10)
Input voltage controlled by ECU ECU, freely can regulate according to electromotor job demand.
The valve actuating mechanism without camshaft of a kind of Piezoelectric Driving the most according to claim 1, it is characterised in that big piston (8)
And seal No leakage between hydraulic cylinder (4), between valve piston (3) and hydraulic cylinder (4), have micro-leakage.
The valve actuating mechanism without camshaft of a kind of Piezoelectric Driving the most according to claim 1, it is characterised in that accumulator (5)
Operating pressure is relatively low, is only used for ensureing that big piston (8) is in close contact with drive block (9) all the time, valve piston (3) all the time with gas
Door (1) is in close contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620321327.3U CN205654389U (en) | 2016-04-11 | 2016-04-11 | Piezoelectricity driven does not have camshaft valve actuating mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620321327.3U CN205654389U (en) | 2016-04-11 | 2016-04-11 | Piezoelectricity driven does not have camshaft valve actuating mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205654389U true CN205654389U (en) | 2016-10-19 |
Family
ID=57390436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620321327.3U Expired - Fee Related CN205654389U (en) | 2016-04-11 | 2016-04-11 | Piezoelectricity driven does not have camshaft valve actuating mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205654389U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106545376A (en) * | 2016-10-26 | 2017-03-29 | 江苏理工学院 | Based on piezoelectric unit part driving internal combustion engine valve without camshaft valve actuating mechanism |
| CN107288699A (en) * | 2016-04-11 | 2017-10-24 | 浙江师范大学 | A kind of Piezoelectric Driving without camshaft valve actuating mechanism |
| CN107975395A (en) * | 2016-10-22 | 2018-05-01 | 浙江师范大学 | A kind of tappet formula of Piezoelectric Driving is without camshaft valve actuating mechanism |
| CN109404141A (en) * | 2018-11-09 | 2019-03-01 | 潍柴动力股份有限公司 | A kind of variable valve control apparatus and method |
-
2016
- 2016-04-11 CN CN201620321327.3U patent/CN205654389U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107288699A (en) * | 2016-04-11 | 2017-10-24 | 浙江师范大学 | A kind of Piezoelectric Driving without camshaft valve actuating mechanism |
| CN107975395A (en) * | 2016-10-22 | 2018-05-01 | 浙江师范大学 | A kind of tappet formula of Piezoelectric Driving is without camshaft valve actuating mechanism |
| CN106545376A (en) * | 2016-10-26 | 2017-03-29 | 江苏理工学院 | Based on piezoelectric unit part driving internal combustion engine valve without camshaft valve actuating mechanism |
| CN109404141A (en) * | 2018-11-09 | 2019-03-01 | 潍柴动力股份有限公司 | A kind of variable valve control apparatus and method |
| CN109404141B (en) * | 2018-11-09 | 2021-05-18 | 潍柴动力股份有限公司 | Variable valve control device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161019 |