CN103470419A - Piezoelectric direct-driven fuel injector with rotation type valve core - Google Patents
Piezoelectric direct-driven fuel injector with rotation type valve core Download PDFInfo
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- CN103470419A CN103470419A CN2013103634127A CN201310363412A CN103470419A CN 103470419 A CN103470419 A CN 103470419A CN 2013103634127 A CN2013103634127 A CN 2013103634127A CN 201310363412 A CN201310363412 A CN 201310363412A CN 103470419 A CN103470419 A CN 103470419A
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- spool
- push rod
- valve core
- piezoelectric
- fuel injector
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Abstract
The invention belongs to the field of a fuel injector of a fuel injection system of an internal combustion engine and particularly relates to a piezoelectric direct-driven fuel injector which directly drives the valve core of a fuel injection nozzle to realize the turn-on or turn-off of fuel injection by utilizing the electrogenerated displacement of a ceramic piezoelectric stack. According to the piezoelectric direct-driven fuel injector with the rotation type valve core, displacement is amplified by a mechanical type displacement amplifier through the utilization of a characteristic of a piezoelectric ceramic material that the displacement is generated in the power-on state, and linear motion is changed to rotary motion so that the valve core is driven to control the opening or closing of an injection hole; the piezoelectric direct-driven fuel injector mainly comprises a fuel injector body, a piezoelectric actuator, an ejection rod, the valve core, a valve seat, a return spring, a fine adjustment nut, a sealing nut and the like. By the adoption of the piezoelectric direct-driven fuel injector with the rotation type valve core, the direct driving of the valve core by the piezoelectric actuator is realized through the rotation type valve core; the structure is simple; the response is sensitive; the impact vibration is weak; the effect of energy conservation and emission reduction is quite good.
Description
Technical field
The invention belongs to internal combustion engine fuel injection system oil sprayer field, particularly a kind ofly utilize piezoelectric ceramics heap electricity to cause displacement directly to drive the oil nozzle Spool rotating to realize the piezoelectric direct drive type oil sprayer that oil spout opens and closes.
Background technique
Internal-combustion engine demand as one of industry major impetus such as industry, agricultural, building, communications and transportation plays a significant role at rapid growth and in quite long period, but engine exhaust has obtained science and fact proved the mankind's harm, the major issue that is related to national physique, descendants, helps planet Earth, so more and more stricter energy-conservation and discharge policy is imperative and progressively implement.
Oil sprayer is a kind of according to different internal-combustion engine requirements, and the fuel oil that high pressure oil pump is come sprays into the device of firing chamber special position with certain injection pressure, granularity of spray, fuel injection characteristic, range and cone angle, be the core component that directly affects engine performance.The traditional electrical magnetic executor can not directly meet state IV (Europe IV) emission standard, need to increase exhaust gas processing device, the more difficult requirement that meets state V, and what the piezoelectric ceramics final controlling element substituted electromagnetic actuator becomes trend.
The piezo actuator fast response time, there is no hysteresis, favorable repeatability, can fully meet the demand of more and more fuel oil injecting times in stroke of internal-combustion engine; But as adopt traditional leading type to drive, can make this advantage have a greatly reduced quality, therefore the present invention adopts piezoelectric direct drive type, can give full play to the advantage of piezoelectric ceramics final controlling element, effectively reduce fuel consume, reduce pollution emissions, there is huge economic value and social value.
Summary of the invention
Based on above-mentioned situation, invented and a kind ofly utilized piezoelectric ceramics heap electricity to cause displacement directly to drive the oil nozzle Spool rotating to realize the piezoelectric direct drive type oil sprayer that oil spout opens and closes.
This oil sprayer basic structure is that valve seat is connected with oil injector body by sealing nut, and spool, push rod, return spring, piezo actuator are equipped with from the bottom up in section within it, and seal with fine-tuning nut.Fine-tuning nut can conveniently be adjusted the initial position of piezo actuator and push rod.
Displacement amplification and steering structure are arranged on push rod and spool, and its structure is that two voussoirs with 30 ° of inclined-planes are arranged on push rod, and voussoir is inserted in the groove with 30 ° of inclined-planes on spool, two inclined-plane contacts; Rotate because ramp effect makes spool when push rod moves downward, and because the inclination angle on inclined-plane is 30 degree, can make stroke be amplified to 1.732 times of former stroke.
The spool return structure is that push rod promotes the spool rear compression retracteding position spring that rotates, and return spring one end withstands in the groove of spool side, and the other end withstands on valve base inner wall; When push rod is return, return spring forces the spool counterrotating to reset.
The structure of spool bottom oil groove and valve seat spray orifice is: the uniform n in centrum side, spool bottom (n is fixed according to design) cannelure, and a uniform n spray orifice on valve seat, the diameter of spray orifice is less than or equal to the width of groove; Because the spray orifice distribution diameter is larger than top " displacement and steering equipment " diameter, so be equivalent to further enlarge the piezo actuator displacement.
Beneficial effect of the present invention is:
1. oil sprayer adopts the piezoelectric direct drive type structure, has fully developed the advantage of piezo actuator fast response time, favorable repeatability, for energy-saving and emission-reduction and favourable;
2. oil sprayer adopts the turning valve core type structure, simple in structure, components and parts are few, and the valve core movement impact shock is little, is conducive to reduce costs, improve the life-span;
3. the two-stage displacement amplifying mechanism is arranged in oil sprayer, can reach 2.5～3.5 times of piezo actuator displacement, efficiently solve the problem that piezo actuator self displacement is difficult to meet the stroke requirement.
The accompanying drawing explanation
Fig. 1: turning valve core type piezoelectricity directly drives oil sprayer.
Number in the figure: 1-fine-tuning nut; The 2-piezo actuator; The 3-oil injector body; The 4-push rod; The 5-return spring; The 6-spool; The 7-valve seat; The 8-sealing nut
Fig. 2: displacement is amplified and steering equipment.
Number in the figure: 4-push rod; The 6-spool; The 41-voussoir; 42-30 ° of inclined-plane; The 61-groove; 62-30 ° of inclined-plane; 63-return spring groove.
Fig. 3: spool bottom oil groove and valve seat jet orifice structure.
Number in the figure: 6-spool; The 7-valve seat; The 64-oil groove; The 71-spray orifice.
Embodiment
The invention provides and a kind ofly utilize piezoelectric ceramics heap electricity to cause displacement directly to drive the oil nozzle Spool rotating to realize the piezoelectric direct drive type oil sprayer that oil spout opens and closes, below in conjunction with the drawings and specific embodiments, the present invention will be further described.
1. in the embodiment shown in fig. 1, spool (4), as in valve seat (7), is installed to return spring (5) and determined its initial axial position, in the valve body (3) of simultaneously push rod (4) being packed into; By valve seat (7) end face with oil injector body (3) bottom surface, be affixed, after align in axle center and the groove (61) of the voussoir (41) of determining push rod (4) and spool (6) has relative tram, with sealing nut (8) tightening sealing; The piezo actuator (2) of packing in valve body (3), and, with fine-tuning nut (1) sealing, regulate the position of fine-tuning nut (1) to guarantee the piezo actuator tram.
2. in the amplification of displacement shown in Fig. 2 and steering structure embodiment, push rod (4) two bottom sides has two voussoirs with 30 ° of inclined-planes (42) (41), on spool (6) position correspondingly, also has with two grooves with 30 ° of inclined-planes (62) (61); Voussoir (41) is inserted in groove (61), and two inclined-planes (42 and 62) contact; When push rod (4) rotates because ramp effect makes spool (6) while moving downward, and because the inclination angle of inclined-plane (62) is 30 degree, can make Spool rotating circumference stroke be amplified to 1.732 times of former rectilinear path.
3. after push rod (4) promotes spool (6) rotation oil spout, need reset and stop oil spout, its implementation is to utilize return spring (5), and the one end withstands in spool (6) side groove (63), and the other end withstands on valve base inner wall; Spool (6) can compression retracteding position spring (5) while rotating, and when push rod (4) while returning, return spring (5) forces spool (6) counterrotating to reset.
4. in the structure embodiment of the bottom oil groove of spool shown in Fig. 3 and valve seat spray orifice, spool (6) the bottom uniform n in centrum side (n is fixed according to design) cannelure (64), the upper uniform n spray orifice (71) of valve seat (7), the diameter of spray orifice (71) is less than or equal to the width of groove (64); When push rod (4) promotes spool (6) rotation, spray orifice (71) oil spout of aliging with groove (64); Return spring (5) band movable valve plug (6) resets and makes spray orifice (71) and groove (64) dislocation, stops oil spout.
5. working procedure is implemented.Turning valve core type piezoelectricity of the present invention directly drives oil sprayer, at normal not oil spout state, and spray orifice (71) dislocation on the groove (64) on spool (6) and valve seat (7), spool (6) bottom conical surface seal spray orifice (71); While needing oil spout, piezo actuator (2) energising, voltage is determined according to required Driving force and stroke, its electricity causes displacement promotion push rod (4) and does downward straight line motion, 30 ° of inclined-planes (62) in the upper groove (61) of the upper upper 30 ° of inclined-planes of voussoir (41) (42) the band movable valve plugs of process push rod (4) (6) amplify displacement, and change moving direction rotates spool (6); Oil groove (63) on spool (6) and spray orifice (71) on valve seat (7) commencement of fuel injection while aliging gradually; While finishing oil spout, piezo actuator (2) stops energising, and spool (4) Driving force disappears, and return spring (5) promotes spool (6) counterrotating and makes spray orifice (71) and groove (64) dislocation, stops oil spout.
Claims (5)
1. a Spool rotating formula piezoelectricity directly drives oil sprayer, and kernel component wherein has oil injector body (3), piezo actuator (2), push rod (4), return spring (5), spool (6), valve seat (7), sealing nut (8), fine-tuning nut (1) etc.It is characterized in that: valve seat (7) is connected with oil injector body (3) by sealing nut (8), spool (6), push rod (4), return spring (5), piezo actuator (2) are equipped with from the bottom up in section within it, and seal with fine-tuning nut (1).
2. directly drive oil sprayer according to claim 1 Spool rotating formula piezoelectricity, it is characterized in that: piezo actuator (2) electricity causes displacement promotion push rod (4) and does straight line motion, displacement amplification and steering structure through on push rod (4) and spool (6), rotate spool (6).
3. directly drive oil sprayer according to claim 2 Spool rotating formula piezoelectricity, it is characterized in that: displacement amplification and steering structure are that two voussoirs with 30 ° of inclined-planes (42) (41) are arranged on push rod (4), voussoir (41) is inserted in the groove with 30 ° of inclined-planes (62) (61) on spool (6), and two inclined-planes (42 and 62) contact; When push rod (4) rotates because ramp effect makes spool (6) while moving downward, and because the inclination angle of inclined-plane (62) is 30 degree, can make stroke be amplified to 1.732 times of former stroke.
4. directly drive oil sprayer according to claim 2 Spool rotating formula piezoelectricity, it is characterized in that: push rod (4) promotes spool (6) the rear compression retracteding position spring (5) that rotates, return spring (5) one ends withstand in spool (6) side groove (63), and the other end withstands on valve base inner wall; When push rod (4), while returning, return spring (5) forces spool (6) counterrotating to reset.
5. directly drive oil sprayer according to claim 1 Spool rotating formula piezoelectricity, it is characterized in that: spool (6) the bottom uniform n in centrum side (n is fixed according to design) cannelure (64), the upper uniform n spray orifice (71) of valve seat (7), the diameter of spray orifice (71) is less than or equal to the width of groove (64); When push rod (4) promotes spool (6) rotation, spray orifice (71) oil spout of aliging with groove (64); Return spring (5) band movable valve plug (6) resets and makes spray orifice (71) and groove (64) dislocation, stops oil spout.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103634127A CN103470419A (en) | 2013-08-16 | 2013-08-16 | Piezoelectric direct-driven fuel injector with rotation type valve core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103634127A CN103470419A (en) | 2013-08-16 | 2013-08-16 | Piezoelectric direct-driven fuel injector with rotation type valve core |
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| CN103470419A true CN103470419A (en) | 2013-12-25 |
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| CN2013103634127A Pending CN103470419A (en) | 2013-08-16 | 2013-08-16 | Piezoelectric direct-driven fuel injector with rotation type valve core |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219846A (en) * | 2019-05-23 | 2019-09-10 | 浙江大学城市学院 | A kind of high-speed driving device towards two-dimensional valve |
| CN113339171A (en) * | 2021-05-31 | 2021-09-03 | 赵艳丽 | Oil nozzle for automobile engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1130719A (en) * | 1994-11-15 | 1996-09-11 | 株式会社泽克西尔 | Variable injection hole type fuel injection nozzle |
| CN2413041Y (en) * | 2000-03-22 | 2001-01-03 | 袁辉 | Rotary needle-valve type injector |
| US20050056706A1 (en) * | 2003-08-08 | 2005-03-17 | Crofts John D. | Piezoelectric control valve adjustment method |
| CN101354000A (en) * | 2007-07-27 | 2009-01-28 | 瓦特西拉瑞士股份有限公司 | Injection nozzle for fuel |
| CN103195627A (en) * | 2013-03-26 | 2013-07-10 | 哈尔滨工程大学 | Direct control type piezoelectric oil injector |
-
2013
- 2013-08-16 CN CN2013103634127A patent/CN103470419A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1130719A (en) * | 1994-11-15 | 1996-09-11 | 株式会社泽克西尔 | Variable injection hole type fuel injection nozzle |
| CN2413041Y (en) * | 2000-03-22 | 2001-01-03 | 袁辉 | Rotary needle-valve type injector |
| US20050056706A1 (en) * | 2003-08-08 | 2005-03-17 | Crofts John D. | Piezoelectric control valve adjustment method |
| CN101354000A (en) * | 2007-07-27 | 2009-01-28 | 瓦特西拉瑞士股份有限公司 | Injection nozzle for fuel |
| CN103195627A (en) * | 2013-03-26 | 2013-07-10 | 哈尔滨工程大学 | Direct control type piezoelectric oil injector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219846A (en) * | 2019-05-23 | 2019-09-10 | 浙江大学城市学院 | A kind of high-speed driving device towards two-dimensional valve |
| CN110219846B (en) * | 2019-05-23 | 2020-06-02 | 浙江大学城市学院 | High-speed driving device for two-dimensional valve |
| CN113339171A (en) * | 2021-05-31 | 2021-09-03 | 赵艳丽 | Oil nozzle for automobile engine |
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Application publication date: 20131225 |