CN103726945A - Oxygen sensor installation structure of motorcycle engine - Google Patents
Oxygen sensor installation structure of motorcycle engine Download PDFInfo
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- CN103726945A CN103726945A CN201310661740.5A CN201310661740A CN103726945A CN 103726945 A CN103726945 A CN 103726945A CN 201310661740 A CN201310661740 A CN 201310661740A CN 103726945 A CN103726945 A CN 103726945A
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- exhaust passage
- lambda sensor
- motorcycle engine
- oxygen sensor
- exhaust
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Abstract
The invention discloses an oxygen sensor installation structure of a motorcycle engine. The oxygen sensor installation structure of the motorcycle engine comprises an air cylinder head, wherein an exhaust passage is formed in the air cylinder head, an oxygen sensor is arranged on the air cylinder head and installed in a sensor installation hole formed in the air cylinder head, the sensor installation hole is a counter bore not penetrating through the inner wall of the exhaust passage, a probe part of the oxygen sensor is located in the sensor installation hole, is not exposed out of the sensor installation hole and is in the exhaust passage, the sensor installation hole is communicated with the exhaust passage through an exhaust branch passage, and the exhaust branch passage comprises an air inlet passage located in the upstream side of the exhaust passage and an air outlet passage located in the downstream side of the exhaust passage. The temperature of an oxygen sensor installation part is effectively lowered, the heat resistance of the oxygen sensor is improved, the oxygen sensor is prevented from being damaged due to the bad work conditions of the oxygen sensor installation part, and the service life of the oxygen sensor is prolonged. Meanwhile, the space of the exhaust passage is not occupied, the performance of the engine is improved, and the oxygen sensor is arranged more flexibly.
Description
Technical field
The present invention relates to motorcycle engine, is the lambda sensor mounting structure of motorcycle engine specifically.
Background technique
Lambda sensor on motorcycle is used for measuring and feeding back the oxygen content in the exhaust after engine combustion, so that its burning reaches optimal air-fuel ratio, effectively reduces the composition of carbon monoxide in exhaust, hydrocarbon and oxynitrides.Lambda sensor is divided into hot type and non-hot type, and heating type oxygen sensors is because its price is high, complex structure, therefore generally adopt non-heating type oxygen sensors, but not heating type oxygen sensors is due to the requirement to engine exhaust temperature, must be arranged near near engine cylinder head relief opening.In conventional art, non-heating type oxygen sensors is generally arranged on the cylinder head of motor, the gauge head portion of sensor extend in the exhaust passage of cylinder head, utilize the high-temp waste gas in exhaust passage to carry out start detection chip, but, because delivery temperature is up to 800 ℃ of left and right, because gauge head portion being extend in exhaust passage, make the assembly department of sensor near exhaust passage, cause the temperature of installation of sensors portion also to approach this temperature, cause the operating mode of installation of sensors portion badly fragile; Secondly, the gauge head portion of sensor is extend in the exhaust passage of cylinder head, can hinder the smooth of exhaust stream in exhaust passage and flow, engine performance is had a negative impact; The 3rd, for improving the testing precision of sensor, as shown in Figure 1, sensor 1 ' must be arranged in the Vertical direction of exhaust passage, to increase the area of being bullied of transducer probe assembly portion, sensor be arranged vertically the more spaces such as the original radiating fin of cylinder head that taken, affected the heat radiation of motor.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of lambda sensor mounting structure of motorcycle engine, can effectively reduce lambda sensor assembly department regional temperature, improve lambda sensor working life, be conducive to flowing smoothly of exhaust stream.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of lambda sensor mounting structure of motorcycle engine, comprise cylinder head, in cylinder head, be formed with exhaust passage, on described cylinder head, be provided with lambda sensor, lambda sensor is arranged in the installation of sensors hole forming on cylinder head, described installation of sensors hole is not for running through the counterbore of exhaust passage inwall, the gauge head portion of described lambda sensor is arranged in described installation of sensors hole and does not expose in described exhaust passage, installation of sensors hole is communicated with described exhaust passage by exhaust discrimination road, described exhaust discrimination road comprises the air inlet duct that is positioned at exhaust passage upstream side and the duct of giving vent to anger that is positioned at downstream side, exhaust passage.
As the improvement of technique scheme, the cross section in described air inlet duct is greater than the cross-section area of lambda sensor gauge head portion.
Preferably the cross section in described air inlet duct is 1.2 ~ 2 times of cross-section area of lambda sensor gauge head portion.
As the further improvement of technique scheme, described air inlet duct is with offside in the mode tilted configuration of upstream, exhaust passage the closer to exhaust passage.
Further, described in, give vent to anger duct with offside in the mode tilted configuration in downstream, exhaust passage the closer to exhaust passage.
Preferably exhaust passage relative to the duct of giving vent to anger, described air inlet duct tilts 30 ° ~ 60 °.
Further, between described air inlet duct and the wall of exhaust passage, cambered surface seamlessly transits.
Further, the relative exhaust passage of described lambda sensor tilts to install.
In the Vertical direction in duct of giving vent to anger described in preferred described lambda sensor is arranged in.
The invention has the beneficial effects as follows: adopt the present invention of said structure, by installation of sensors hole, be set to not run through the counterbore of exhaust passage inwall, the gauge head portion of lambda sensor is arranged in installation of sensors hole and does not expose in exhaust passage, and be communicated with installation of sensors hole and exhaust passage by exhaust discrimination road, tool has the following advantages: 1, make the assembly department of lambda sensor away from exhaust passage, effectively reduce the temperature of lambda sensor assembly department, improved the heat resistance of lambda sensor, avoid the operating mode that occurs lambda sensor assembly department badly to damage, extended the working life of lambda sensor, 2, avoid the gauge head portion of lambda sensor to stretch in exhaust passage, can not take space, exhaust passage, can not have a negative impact to exhaust, improved engine performance, 3, arranging of exhaust discrimination road changed the exhaust stream direction that flows to lambda sensor gauge head portion, makes the layout of lambda sensor more flexible, and lambda sensor is not limited to the Vertical direction of exhaust passage, the features such as the present invention also has simple and reasonable compactness, easy for installation, and implementation cost is low.
Accompanying drawing explanation
Fig. 1 is structural representation when lambda sensor and exhaust passage at right angle setting in conventional art;
Fig. 2 is structural representation of the present invention;
Fig. 3 is complete section schematic diagram of the present invention;
Fig. 4 is the decomposing schematic representation of Fig. 3;
Fig. 5 is fundamental diagram of the present invention;
Fig. 6 is the decomposing schematic representation of Fig. 5;
Fig. 7 is that lambda sensor is arranged in the structural representation in the Vertical direction in the duct of giving vent to anger.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further detailed explanation.
With reference to Fig. 2 ~ Fig. 4, the lambda sensor mounting structure of a kind of motorcycle engine of the present invention, comprise cylinder head 1, in cylinder head 1, be formed with exhaust passage 2, on described cylinder head 1, be provided with lambda sensor 3, lambda sensor 3 is arranged in the installation of sensors hole 4 forming on cylinder head 1, generally between lambda sensor 3 and installation of sensors hole 4 by known screw thread 33, is connected (assembly department that is lambda sensor) and realizes installation and fix, described installation of sensors hole 4 is not for running through the counterbore of exhaust passage 2 inwalls, the gauge head portion 31 of described lambda sensor 3 is arranged in described installation of sensors hole 4 and does not expose in described exhaust passage 2, installation of sensors hole 4 is communicated with described exhaust passage 2 by exhaust discrimination road 5, the exhaust discrimination road that is wherein positioned at exhaust passage 2 upstream sides is air inlet duct 51, the exhaust discrimination road that is positioned at 2 downstream sides, exhaust passage is the duct 52 of giving vent to anger, in what is called, the side that the exhaust passage that downstream side refers to receives the waste gas of motor discharge is upstream side, the side that waste gas is discharged in atmosphere is downstream side.
The gauge head portion 31 of lambda sensor 3 comprises sensing chip; sensing chip is arranged in the element protection cap with a plurality of apertures 32; waste gas need be invaded and sensing contact chip inside from those apertures 32 to element protection cap; lambda sensor just can be activated and play the object of detection; in the present embodiment; the cross section in preferred described air inlet duct 51 is greater than the cross-section area of lambda sensor gauge head portion 31, and preferably the cross section in described air inlet duct 51 is 1.2 ~ 2 times of cross-section area of lambda sensor gauge head portion 31.This is conducive to a plurality of apertures 32 on waste gas cladding element protective cap as much as possible, to increase the waste gas invading in element protection cap, improves the testing precision of lambda sensor 3; Air inlet duct 51 its cross sections can be non-circles, and when its cross section is that circle is air inlet duct 51 during for circular hole, the radial dimension in air inlet duct 51 is designed to 1.2 ~ 2 times of gauge head portion 31 radial dimensions of lambda sensor.
In the present embodiment, preferred described air inlet duct 51 with the closer to exhaust passage 2 offside in exhaust passage the mode tilted configuration of 2 upstreams.Be conducive to like this waste gas and enter into smoothly in installation of sensors hole 4 and invade element protection cap inside, further improve the testing precision of lambda sensor 3.
In the present embodiment, described give vent to anger duct 52 with the closer to exhaust passage 2 offside in exhaust passage the mode tilted configuration in 2 downstreams, the waste gas that this structure is conducive in installation of sensors hole 4 is drained through the duct 52 of giving vent to anger as early as possible, avoid occurring that waste gas accumulates in installation of sensors hole 4, causing waste gas in exhaust passage 2 to be subject to accumulating the impact of waste gas and can not well to enter into installation of sensors hole 4 contacts with gauge head portion 31, improve the renewal frequency of installation of sensors hole 4 interior waste gas, improve testing precision.
Through overtesting, exhaust passage relative to the duct 52 of giving vent to anger, above-mentioned air inlet duct 51 2 30 ° ~ 60 ° layouts that tilt, can obtain the effect of relative ideal, and wherein the tiltangleθ of air inlet duct 51Yu exhaust passage 52 is shown in Figure 2.
In the present embodiment, between the wall of 51Yu exhaust passage, described air inlet duct 2, cambered surface seamlessly transits, so can reduce waste gas from exhaust passage 2 resistances that enter into air inlet duct 51.
As the present embodiment preferably, the installations of the relative exhaust passage 2 of described lambda sensor 3 can being tilted, as shown in Figure 5, in the Vertical direction in the duct 52 of giving vent to anger described in preferably described lambda sensor 3 being arranged in.This structure decrease tying up of 3 pairs of radiating fin spaces of lambda sensor, be conducive to the heat radiation of motor.
Tool of the present invention has the following advantages: 1, make the assembly department (band of position is threaded) of lambda sensor 3 away from exhaust passage 2, effectively reduce the temperature of lambda sensor assembly department, improved the heat resistance of lambda sensor 3, avoid the operating mode that occurs lambda sensor assembly department badly to damage, extended the working life of lambda sensor; 2, avoid the gauge head portion 31 of lambda sensor 3 to stretch in exhaust passage 2, can not take 2 spaces, exhaust passage, can not have a negative impact to exhaust, improved engine performance; 3, specifically referring to shown in Fig. 3 ~ Fig. 4, exhaust discrimination road 5 the exhaust stream direction that has changed the gauge head portion 31 that flows to lambda sensor is set, wherein arrow A is the exhaust stream flow direction in exhaust passage 2, arrow B is that the exhaust stream that enters into air inlet duct 51 flows to, make the layout of lambda sensor 3 more flexible, lambda sensor 3 is not limited to the Vertical direction of exhaust passage 2, when the relative exhaust passage 2 of lambda sensor 3 tilts to install, can reduce tying up of 3 pairs of radiating fin spaces of lambda sensor, be conducive to the heat radiation of motor; The features such as the present invention also has simple and reasonable compactness, easy for installation, and implementation cost is low.
The above, be better embodiment of the present invention, but the present invention is not limited to above-described embodiment, as long as it reaches technique effect of the present invention with any same or similar means, within all should falling into protection scope of the present invention.
Claims (9)
1. the lambda sensor mounting structure of a motorcycle engine, comprise cylinder head, in cylinder head, be formed with exhaust passage, on described cylinder head, be provided with lambda sensor, lambda sensor is arranged in the installation of sensors hole forming on cylinder head, it is characterized in that: described installation of sensors hole is not for running through the counterbore of exhaust passage inwall, the gauge head portion of described lambda sensor is arranged in described installation of sensors hole and does not expose in described exhaust passage, installation of sensors hole is communicated with described exhaust passage by exhaust discrimination road, described exhaust discrimination road comprises the air inlet duct that is positioned at exhaust passage upstream side and the duct of giving vent to anger that is positioned at downstream side, exhaust passage.
2. the lambda sensor mounting structure of a kind of motorcycle engine according to claim 1, is characterized in that: the cross section in described air inlet duct is greater than the cross-section area of lambda sensor gauge head portion.
3. the lambda sensor mounting structure of a kind of motorcycle engine according to claim 2, is characterized in that: the cross section in described air inlet duct is 1.2 ~ 2 times of cross-section area of lambda sensor gauge head portion.
4. according to the lambda sensor mounting structure of a kind of motorcycle engine described in claim 1 or 2 or 3, it is characterized in that: described air inlet duct is with offside in the mode tilted configuration of upstream, exhaust passage the closer to exhaust passage.
5. the lambda sensor mounting structure of a kind of motorcycle engine according to claim 4, is characterized in that: described in give vent to anger duct with offside in the mode tilted configuration in downstream, exhaust passage the closer to exhaust passage.
6. the lambda sensor mounting structure of a kind of motorcycle engine according to claim 5, is characterized in that: exhaust passage relative to the duct of giving vent to anger, described air inlet duct tilts 30 ° ~ 60 °.
7. the lambda sensor mounting structure of a kind of motorcycle engine according to claim 1, is characterized in that: between described air inlet duct and the wall of exhaust passage, cambered surface seamlessly transits.
8. the lambda sensor mounting structure of a kind of motorcycle engine according to claim 1, is characterized in that: the relative exhaust passage of described lambda sensor tilts to install.
9. the lambda sensor mounting structure of a kind of motorcycle engine according to claim 8, is characterized in that: in the Vertical direction in the duct of giving vent to anger described in described lambda sensor is arranged in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310661740.5A CN103726945A (en) | 2013-12-06 | 2013-12-06 | Oxygen sensor installation structure of motorcycle engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310661740.5A CN103726945A (en) | 2013-12-06 | 2013-12-06 | Oxygen sensor installation structure of motorcycle engine |
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| CN103726945A true CN103726945A (en) | 2014-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310661740.5A Pending CN103726945A (en) | 2013-12-06 | 2013-12-06 | Oxygen sensor installation structure of motorcycle engine |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63179142A (en) * | 1987-12-17 | 1988-07-23 | Nissan Motor Co Ltd | Exhaust manifold for internal combustion engine |
| DE3838332A1 (en) * | 1987-12-11 | 1989-06-22 | Outboard Marine Corp | TWO-STOCK COMBUSTION ENGINE |
| US5241853A (en) * | 1991-12-13 | 1993-09-07 | Industrial Technology Research Institute | Exhaust fume sampling apparatus for a two-stroke gasoline engine with a closed loop engine control unit |
| CN203594522U (en) * | 2013-12-06 | 2014-05-14 | 江门市大长江集团有限公司 | Oxygen sensor installation structure of motorcycle engine |
| US8893471B2 (en) * | 2013-02-28 | 2014-11-25 | Kawasaki Jukogyo Kabushiki Kaisha | Exhaust apparatus for four wheeled utility vehicle |
-
2013
- 2013-12-06 CN CN201310661740.5A patent/CN103726945A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3838332A1 (en) * | 1987-12-11 | 1989-06-22 | Outboard Marine Corp | TWO-STOCK COMBUSTION ENGINE |
| JPS63179142A (en) * | 1987-12-17 | 1988-07-23 | Nissan Motor Co Ltd | Exhaust manifold for internal combustion engine |
| US5241853A (en) * | 1991-12-13 | 1993-09-07 | Industrial Technology Research Institute | Exhaust fume sampling apparatus for a two-stroke gasoline engine with a closed loop engine control unit |
| US8893471B2 (en) * | 2013-02-28 | 2014-11-25 | Kawasaki Jukogyo Kabushiki Kaisha | Exhaust apparatus for four wheeled utility vehicle |
| CN203594522U (en) * | 2013-12-06 | 2014-05-14 | 江门市大长江集团有限公司 | Oxygen sensor installation structure of motorcycle engine |
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Application publication date: 20140416 |