CN205225491U - Engine burning is jar pressure sensor installation seal structure for closed loop - Google Patents
Engine burning is jar pressure sensor installation seal structure for closed loop Download PDFInfo
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- CN205225491U CN205225491U CN201521093410.1U CN201521093410U CN205225491U CN 205225491 U CN205225491 U CN 205225491U CN 201521093410 U CN201521093410 U CN 201521093410U CN 205225491 U CN205225491 U CN 205225491U
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- closed loop
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Abstract
The utility model provides an engine burning is jar pressure sensor installation seal structure for closed loop, including installing the sleeve and installing and press the sensor at its inside jar, the installation sleeve includes sleeve upper portion, the sleeve lower part, sleeve upper portion is roof on the drawing -in cylinder cap in proper order, cooperate with the upper end of sleeve lower part behind the water jacket, the bottom entry cylinder cap lower plate of sleeve lower part and rather than screw -thread fit, the bottom matched with sealing conical face who presses the sensor with the jar is seted up to the inside of sleeve lower part, between the up end of this sealing conical face and sleeve lower part apart from 2 times of the upper end pipe diameter of less than or equal to sleeve lower part. This design has the pressure drag of being applicable to formula jar and presses the sensor, seals characteristics such as effectual.
Description
Technical field
The utility model belongs to technical field of automobile engine, is specifically related to a kind of engine combustion closed loop cylinder pressure sensor installation sealing structure.
Background technique
Day by day serious along with the energy and environmental problem, forces automobile industry to seek engine cylinder combustion and improves and the solution of cylinder tail gas clean-up outward.Nearly ten years, the new combustion mode being representative with homogeneous charge compression ignition (HCCI) and the use of alternative fuel, became engine cylinder combustion priority fields of study.The appearance of the Trade-off relation of NOx and PM is avoided in HCCI burning from principle, maintain and significantly reduce discharge compared with while high burning efficiency.The diversification of alternative fuel not only solves the problem of oil shortage, is also improved the potentiality of in-cylinder combustion, and the physicochemical characteristic of different fuel is also improved effect for HCCI burning.But all there are some problems in HCCI burning and alternative fuel in application process.
For HCCI burning, because of the feature of its premixing, by the impact of fuel ignition quality, fuel element, mixture temperature and concentration, its combustion regime be very easily subject to extraneous factor interference and restive.Once change appears in these factors, and corresponding adjustment is not made in the control of motor, just there will be combustion instability situation.Adopt with the closed loop control of in-cylinder combustion state for feedback, according to the feedback signal of engine firing condition, corresponding adjustment is made in the change of factor to external world, and combustion regime is stablized.The diversity of alternative fuel makes the physicochemical characteristic of each fuel different, same engine application pluralities of fuel makes the staking-out work amount obtaining respective optimal combustion state large, demarcate Diesel Engine Control parameter and must make compromise in order to can different fuel be used, demarcate difficulty and also can strengthen.Burning closed loop control according to the feedback of engine combustion state, can adjust controling parameters automatically, keeps the stable of combustion regime, makes the application of polynary alternative fuel become possibility.
The feedback signal of engine combustion closed loop adopts cylinder to press signal usually, is obtained the cylinder pressure situation of change of whole combustion process by the cylinder pressure sensor be contained in cylinder.Therefore, the installation of cylinder pressure sensor is sealed to the key of burning closed loop control application.The cylinder pressure sensor carrying out combustion analysis at engine testing room mostly is piezoelectricity type cylinder pressure sensor, and its sensitivity, measuring accuracy, responsiveness are all very high, but it is expensive, is not suitable in engine combustion closed loop control and extensively installs and uses.At present, the practical cylinder pressure sensor for closed-loop feedback of burning mostly is piezoresistance type, and it installs sealing means is conical surface seal, is different from the end face seal of existing piezoelectric transducer.
Sensor installation sealing structure conventional is at present all that sensor installing sleeve is through cylinder cover water jacket, and be contained on cylinder cap, cylinder pressure sensor is installed in sleeve in cylinder cap boring, thus measures cylinder pressure data.Chinese patent: publication number is that the patent of invention of CN101158611A discloses a kind of engines cylinder pressure sensor installation sealing structure, comprise through engine cylinder cover, water channel is until the sensor of firing chamber is installed conduit and is installed on the cylinder pressure sensor that conduit lower end installed by sensor, sensor is installed conduit and is made up of split type two-part up and down, conduit upper part is through cylinder cover, be fixed on cylinder cover, lower end is enclosed within conduit lower part, the external process screw thread of conduit lower part, be connected with its Screw assembly through water channel upper wall, water channel lower wall is processed with around sensor mounting hole the sealing platform of a circle indent, the lower end of conduit lower part and sealing contact with platform realize sealing.Although this invention effectively can solve the problem of canned motor cylinder head cooling water, lubricant oil, high-pressure gas, but in the structure shown here, hub internal bore diameter is little, the degree of depth is large, the precision of processing the sealing surface combined with cylinder pressure sensor is difficult to ensure, easily cause sensor poorly sealed, engine cylinder inner high voltage gas leaks from sealing, thus affects engine measuring result, therefore, said structure be not suitable for piezoresistance type cylinder pressure sensor.
Summary of the invention
The purpose of this utility model is the problem not being suitable for piezoresistance type cylinder pressure sensor overcoming prior art existence, provides a kind of engine combustion closed loop cylinder pressure sensor installation sealing structure being applicable to piezoresistance type cylinder pressure sensor.
For realizing above object, the technical solution of the utility model is as follows:
A kind of engine combustion closed loop cylinder pressure sensor installation sealing structure, the cylinder pressure sensor comprising installing sleeve and install therein, described installing sleeve is split-type structural, comprises the upper cartridge, the lower cartridge that cooperatively interact;
The inside of described lower cartridge offers the sealing cone matched with the bottom of cylinder pressure sensor, and the distance between described sealing cone and the upper-end surface of lower cartridge is less than or equal to 2 times of the upper end caliber of lower cartridge.
The outer wall of described lower cartridge offers the screw thread matched with the inwall of upper cartridge, and the degree of depth of screw thread is 1.5 ?2 times of the upper end caliber of lower cartridge.
Match with the upper end of lower cartridge after described upper cartridge passes cylinder cap upper plate, water jacket successively, the lower end of lower cartridge insert cylinder cap lower shoe and with its screw-thread fit.
Sealing gasket is provided with between the lower end of described upper cartridge and lower cartridge, between the middle part of lower cartridge and cylinder cap lower shoe.
Seal ring is provided with between described upper cartridge and cylinder cap upper plate.
Compared with prior art, the beneficial effects of the utility model are:
1, the inside of a kind of engine combustion closed loop of the utility model cylinder pressure sensor installation sealing structure middle sleeve bottom offers the sealing cone matched with the bottom of cylinder pressure sensor, and the distance between sealing cone and the upper-end surface of lower cartridge is less than or equal to 2 times of the upper end caliber of lower cartridge, during assembling, the sealing cone place that only cylinder pressure sensor need be pressed in lower cartridge can realize its sealing, first, this design is applicable to piezoresistance type cylinder pressure sensor, secondly, the working depth of cutter will be decreased within 2 times of upper end caliber of distance controlling between sealing cone and the upper-end surface of lower cartridge portion under a bushing, effectively can improve the machining accuracy of sealing cone, thus ensure the sealing effect of sleeve and cylinder pressure sensor.Therefore, the utility model is applicable to piezoresistance type cylinder pressure sensor on the one hand, on the other hand, and the good sealing effect of sleeve and cylinder pressure sensor.
The outer wall of 2, a kind of engine combustion closed loop of the utility model cylinder pressure sensor installation sealing structure middle sleeve bottom offers the screw thread matched with the inwall of upper cartridge, and being also provided with sealing gasket between the lower end of upper cartridge and lower cartridge, this design combines to be threaded and ensure that the junction of upper cartridge and lower cartridge and the sealing effect of water jacket with the form of end face press seal.Therefore, the utility model improves the sealing effect between sleeve and engine cylinder-body.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation on Fig. 1 middle sleeve top.
Fig. 3 is the structural representation of Fig. 1 middle sleeve bottom.
In figure: installing sleeve 1, upper cartridge 11, lower cartridge 12, cylinder pressure sensor 2, cylinder cap upper plate 3, water jacket 4, cylinder cap lower shoe 5, sealing gasket 6, seal ring 7.
Embodiment
Illustrate below in conjunction with accompanying drawing and with embodiment, the utility model to be described in further detail.
See Fig. 1 to Fig. 3, a kind of engine combustion closed loop cylinder pressure sensor installation sealing structure, the cylinder pressure sensor 2 comprising installing sleeve 1 and install therein, described installing sleeve 1 is split-type structural, comprises the upper cartridge 11, the lower cartridge 12 that cooperatively interact;
The inside of described lower cartridge 12 offers the sealing cone 121 matched with the bottom of cylinder pressure sensor 2, and the distance between described sealing cone 121 and the upper-end surface of lower cartridge 12 is less than or equal to 2 times of the upper end caliber of lower cartridge 12.
The outer wall of described lower cartridge 12 offers the screw thread matched with the inwall of upper cartridge 11, and the degree of depth of screw thread is 1.5 ?2 times of the upper end caliber of lower cartridge 12.
Described upper cartridge 11 passes cylinder cap upper plate 3 successively, matches with the upper end of lower cartridge 12 after water jacket 4, the lower end insertion cylinder cap lower shoe 5 of lower cartridge 12 and with its screw-thread fit.
Sealing gasket 6 is provided with between the lower end of described upper cartridge 11 and lower cartridge 12, between the middle part of lower cartridge 12 and cylinder cap lower shoe 5.
Seal ring 7 is provided with between described upper cartridge 11 and cylinder cap upper plate 3.
Principle of the present utility model is described as follows:
The utility model comprises installing sleeve 1, cylinder pressure sensor 2, and installing sleeve 1 comprises upper cartridge 11, lower cartridge 12, during assembling, first the lower cartridge 12 loading onto sealing gasket 6 is threaded with upper cartridge 11, then fitting tight circle 7 in upper cartridge 11, and under a bushing the middle part fitting tight pad 6 in portion 12 to complete the assembling of installing sleeve 1, then by the installing sleeve 1 after assembling successively through cylinder cap upper plate 3, insert after water jacket 4 in cylinder cap lower shoe 5 and be threaded with it.
The height of thread of lower cartridge 12 upper end: the height of thread that lower cartridge 12 upper end coordinates with upper cartridge 11 is controlled 1.5 ?2 times of the upper end caliber in portion 12 under a bushing by the utility model, ensure that upper cartridge 11 and lower cartridge 12 in conjunction with screwing force and sealing effect.
Sealing gasket 6: the utility model is provided with sealing gasket 6 between the middle part in portion 12 and cylinder cap lower shoe 5 under a bushing, makes to form end face press seal between lower cartridge 12 and cylinder cap lower shoe 5, thus achieves the sealing between water jacket and firing chamber.
Embodiment 1:
See Fig. 1 to Fig. 3, a kind of engine combustion closed loop cylinder pressure sensor installation sealing structure, the cylinder pressure sensor 2 comprising installing sleeve 1 and install therein, described installing sleeve 1 is split-type structural, comprise upper cartridge 11, lower cartridge 12, described upper cartridge 11 passes cylinder cap upper plate 3 successively, match with the upper end of lower cartridge 12 after water jacket 4, the upper end outer wall of described lower cartridge 12 offers the screw thread matched with the inwall of upper cartridge 11, the degree of depth of this screw thread is 1.5 ?2 times of the upper end caliber of lower cartridge 12, the lower end of lower cartridge 12 insert cylinder cap lower shoe 5 and with its screw-thread fit, the inside of lower cartridge 12 offers the sealing cone 121 matched with the bottom of cylinder pressure sensor 2, distance between the upper-end surface of the sealing conical surface 121 and lower cartridge 12 is less than or equal to 2 times of the upper end caliber of lower cartridge 12, and between the lower end of described upper cartridge 11 and lower cartridge 12, sealing gasket 6 is provided with between the middle part of lower cartridge 12 and cylinder cap lower shoe 5, seal ring 7 is provided with between upper cartridge 11 and cylinder cap upper plate 3.
Claims (5)
1. an engine combustion closed loop cylinder pressure sensor installation sealing structure, the cylinder pressure sensor (2) comprising installing sleeve (1) and install therein, described installing sleeve (1) is split-type structural, comprise the upper cartridge (11), the lower cartridge (12) that cooperatively interact, it is characterized in that:
The inside of described lower cartridge (12) offers the sealing cone (121) matched with the bottom of cylinder pressure sensor (2), and the distance between the upper-end surface of described sealing cone (121) and lower cartridge (12) is less than or equal to 2 times of the upper end caliber of lower cartridge (12).
2. a kind of engine combustion closed loop cylinder pressure sensor installation sealing structure according to claim 1, it is characterized in that: the outer wall of described lower cartridge (12) offers the screw thread matched with the inwall of upper cartridge (11), and the degree of depth of screw thread is 1.5 ?2 times of the upper end caliber of lower cartridge (12).
3. a kind of engine combustion closed loop cylinder pressure sensor installation sealing structure according to claim 1 and 2, it is characterized in that: described upper cartridge (11) passes cylinder cap upper plate (3) successively, water jacket (4) matches with the upper end of lower cartridge (12) afterwards, the lower end of lower cartridge (12) insert cylinder cap lower shoe (5) and with its screw-thread fit.
4. a kind of engine combustion closed loop cylinder pressure sensor installation sealing structure according to claim 1 and 2, is characterized in that: be provided with sealing gasket (6) between the lower end of described upper cartridge (11) and lower cartridge (12), between the middle part of lower cartridge (12) and cylinder cap lower shoe (5).
5. a kind of engine combustion closed loop cylinder pressure sensor installation sealing structure according to claim 3, is characterized in that: be provided with seal ring (7) between described upper cartridge (11) and cylinder cap upper plate (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521093410.1U CN205225491U (en) | 2015-12-25 | 2015-12-25 | Engine burning is jar pressure sensor installation seal structure for closed loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521093410.1U CN205225491U (en) | 2015-12-25 | 2015-12-25 | Engine burning is jar pressure sensor installation seal structure for closed loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205225491U true CN205225491U (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521093410.1U Active CN205225491U (en) | 2015-12-25 | 2015-12-25 | Engine burning is jar pressure sensor installation seal structure for closed loop |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111664020A (en) * | 2020-05-14 | 2020-09-15 | 东风汽车集团有限公司 | Cylinder cover with cylinder pressure sensor sleeve and mounting method thereof |
-
2015
- 2015-12-25 CN CN201521093410.1U patent/CN205225491U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111664020A (en) * | 2020-05-14 | 2020-09-15 | 东风汽车集团有限公司 | Cylinder cover with cylinder pressure sensor sleeve and mounting method thereof |
| CN111664020B (en) * | 2020-05-14 | 2021-08-31 | 东风汽车集团有限公司 | Cylinder cover with cylinder pressure sensor sleeve and mounting method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |