CN203310568U - Knock sensor - Google Patents
Knock sensor Download PDFInfo
- Publication number
- CN203310568U CN203310568U CN2013204182438U CN201320418243U CN203310568U CN 203310568 U CN203310568 U CN 203310568U CN 2013204182438 U CN2013204182438 U CN 2013204182438U CN 201320418243 U CN201320418243 U CN 201320418243U CN 203310568 U CN203310568 U CN 203310568U
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- CN
- China
- Prior art keywords
- central sleeve
- cylindrical central
- edge connector
- knock sensor
- shell
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- 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.)
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The utility model discloses a knock sensor. The knock sensor comprises a central sleeve, wherein the lower end of the central sleeve is provided with a flange; a laminated body, formed by a lower insulated gasket, a lower conductive electrode, a piezoelectric element, an upper conductive electrode, an upper insulated gasket and a balancing block, is pressed and fixed on an upper end surface of the flange through a nut rotatably connected to an outer circle of the central sleeve; and the laminated body and the central sleeve are wrapped with a housing formed by injection moulding. The knock sensor is characterized in that a wave washer is disposed between the balancing block and the nut, and an insulated sleeve is disposed between the out circle of the central sleeve and an inner hole of the laminated body. The knock sensor has the advantages that inner members are fastened well, the housing and the central sleeve are combined firmly, and therefore operation sensitivity and service lifetime of the knock sensor can be effectively improved.
Description
Technical field
The utility model relates to a kind of automobile sensor, what be specifically related to is a kind of car knock sensor.
Background technology
During engine operation, because of the duration of ignition of the excessively impacts such as load, temperature and quality of fuel of (ignition advance angle), engine in advance, can cause combustion knock.When pinking occurs, due to gaseous combustion at piston movement to before top dead centre, the lighter produces noise and reduces the power of engine, severe one can be damaged the mechanical part of engine.In order to prevent the generation of pinking, detonation sensor is indispensable vitals, detonation sensor is arranged in the middle of automobile engine cylinder-body, be used for measuring engine shake degree, and output detonation signal, to adapt to when engine produces pinking, adjust ignition advance angle, when engine generation pinking, detonation sensor changes the mechanical vibration of engine into signal voltage delivers to ECU, igniting and other data that ECU stores in advance according to its inside, calculate and revise ignition advance angle in time, go to adjust the duration of ignition, prevent the generation of pinking.
The detonation sensor of applying at present, be mostly the piezoelectric type resonance type sensor, the mechanical vibration that produce while utilizing piezoelectric effect pinking change signal voltage into, when the vibration frequency (about about 6000Hz) when the generation pinking is consistent with the natural frequency of detonation sensor self, namely produce resonance effect.At this moment sensor can be exported a very high detonation signal voltage and deliver to ECU, and ECU revises the duration of ignition in time, avoids the generation of pinking.Current piezoelectric type detonation sensor exists that internals connect that tightness is not ideal enough, shell is combined the firm defect such as poor with cylindrical central sleeve, thereby can have influence on working sensitivity and the serviceable life of detonation sensor.
Summary of the invention
In view of the problem that current known technology exists, the technical problems to be solved in the utility model is to provide that a kind of internals tightness is good, shell is combined with cylindrical central sleeve firmly, raising working sensitivity and the detonation sensor in serviceable life.
For solving the problems of the technologies described above, the utility model takes following technical scheme to complete:
A kind of detonation sensor, comprise cylindrical central sleeve, the lower end of cylindrical central sleeve is flanged, the duplexer that lower insulating washer, lower conductive electrode, piezoelectric element, upper conductive electrode, upper insulating washer and counterbalance weight form is pressed abd fixed on the flange upper surface by the nut that is screwed in the cylindrical central sleeve cylindrical, duplexer, cylindrical central sleeve are wrapped up by the shell of injection mo(u)lding, it is characterized in that: between counterbalance weight and nut, be provided with wave washer, be provided with insulation sleeve between the cylindrical of cylindrical central sleeve and the endoporus of duplexer.
The detonation sensor of technique scheme, when internals are assembled, at first (cylindrical central sleeve is generally copper spare to have insulation sleeve to make duplexer closely be set in cylindrical central sleeve, and between piezoelectric element, need the insulation) cylindrical, then in the middle of when nut compresses duplexer, adopted wave washer, make the duplexer can be compacted better, so that the internals of detonation sensor connect tightness is good, working sensitivity and the serviceable life of improving detonation sensor.
As preferably, described cylindrical central sleeve and flange excircle be provided with the V-type annular groove and shell chimeric.Above-mentioned design makes the combination of shell and cylindrical central sleeve more firm, working sensitivity and the serviceable life of improving detonation sensor.
Described shell is provided with edge connector, and the side of edge connector is provided with fixture block, and the top of edge connector is provided with draw runner, is provided with orienting lug in the jack of edge connector, shell, edge connector, fixture block, draw runner and orienting lug integrated injection molding.After adopting above-mentioned design proposal, be beneficial to the integral installation after detonation sensor assembles and fix.
The accompanying drawing explanation
The utility model has following accompanying drawing:
Fig. 1 is outside drawing of the present utility model,
Fig. 2 is cut-away view of the present utility model.
Embodiment
Accompanying drawing has meaned the technical solution of the utility model and embodiment, below further describes by reference to the accompanying drawings each details and the principle of work thereof of embodiment again.
As shown in the figure, detonation sensor of the present utility model, comprise cylindrical central sleeve 1, the lower end of cylindrical central sleeve 1 flanged 10, lower insulating washer 12, lower conductive electrode 11, piezoelectric element 9, upper conductive electrode 7, the duplexer that upper insulating washer 6 and counterbalance weight 5 form is pressed abd fixed on flange 10 upper surfaces by the nut 3 that is screwed in cylindrical central sleeve 1 cylindrical, upper and lower conductive electrode is electrically connected to two lead-out terminals 16, duplexer, cylindrical central sleeve is by shell 8 parcels of injection mo(u)lding, between the cylindrical of cylindrical central sleeve 1 and the endoporus of duplexer, be provided with insulation sleeve 13, make duplexer can closely be set in the cylindrical of cylindrical central sleeve 1, between counterbalance weight 5 and nut 3, be provided with wave washer 4, being convenient to 3 pairs of duplexers of nut better compresses, it is chimeric with shell 8 that described cylindrical central sleeve 1 and flange 10 cylindricals are provided with V-type annular groove 2, make shell 8 more firm with the combination of cylindrical central sleeve 1, described shell 8 is provided with edge connector 15, the side of edge connector 15 is provided with fixture block 18, the top of edge connector 15 is provided with draw runner 14, in the jack of edge connector 15, be provided with orienting lug 17, shell 8, edge connector 15, fixture block 18, draw runner 14 and orienting lug 17 are integrated injection mo(u)lding.
The utility model is work like this: excessive in advance because of the duration of ignition when engine operation, the load of engine, when the impact such as temperature and quality of fuel produces phenomenon of detonation, the mechanical vibration that the piezoelectric element of detonation sensor produces while utilizing piezoelectric effect pinking change signal voltage into, when the vibration frequency (about about 6000Hz) when the generation pinking is consistent with the natural frequency of detonation sensor self, namely produce resonance effect, at this moment sensor can be exported a very high detonation signal voltage and deliver to ECU, igniting and other data that ECU stores in advance according to its inside, calculate in time and revise ignition advance angle, go to adjust the duration of ignition, prevent the generation of pinking.
Claims (3)
1. detonation sensor, comprise cylindrical central sleeve, the lower end of cylindrical central sleeve is flanged, the duplexer that lower insulating washer, lower conductive electrode, piezoelectric element, upper conductive electrode, upper insulating washer and counterbalance weight form is pressed abd fixed on the flange upper surface by the nut that is screwed in the cylindrical central sleeve cylindrical, duplexer, cylindrical central sleeve are wrapped up by the shell of injection mo(u)lding, it is characterized in that: between counterbalance weight and nut, be provided with wave washer, be provided with insulation sleeve between the cylindrical of cylindrical central sleeve and the endoporus of duplexer.
2. a kind of detonation sensor as claimed in claim 1 is characterized in that: described cylindrical central sleeve and flange excircle be provided with the V-type annular groove and shell chimeric.
3. a kind of detonation sensor as claimed in claim 1, it is characterized in that: described shell is provided with edge connector, the side of edge connector is provided with fixture block, the top of edge connector is provided with draw runner, in the jack of edge connector, be provided with orienting lug, shell, edge connector, fixture block, draw runner and orienting lug integrated injection molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204182438U CN203310568U (en) | 2013-07-15 | 2013-07-15 | Knock sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204182438U CN203310568U (en) | 2013-07-15 | 2013-07-15 | Knock sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203310568U true CN203310568U (en) | 2013-11-27 |
Family
ID=49616770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204182438U Expired - Fee Related CN203310568U (en) | 2013-07-15 | 2013-07-15 | Knock sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203310568U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296922A (en) * | 2014-11-07 | 2015-01-21 | 成都衔石科技有限公司 | Burst sensor |
-
2013
- 2013-07-15 CN CN2013204182438U patent/CN203310568U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296922A (en) * | 2014-11-07 | 2015-01-21 | 成都衔石科技有限公司 | Burst sensor |
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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: 20131127 Termination date: 20160715 |