Engine intake manifold and motor
Technical field
The utility model belongs to engine charge technical field, particularly relates to a kind of engine intake manifold and motor.
Background technique
Intake manifold air passage structure is to affect one of the air inflow of motor and principal element of intake uniformity.The full admission amount of the each cylinder of motor is the prerequisite that guarantees that motor peak power realizes; And the uniformity of each cylinder air inlet (comprising air, PCV system mixed gas (hereinafter to be referred as PCV gas) and fuel vapor) directly affects the uniformity of the each cylinder acting of motor ability, lack of homogeneity, can produce the problems such as moment of torsion output is unstable, engine luggine is large, it is the large phenomenon of the indivedual cylinder knocks of restriction simultaneously, can entirety reduce advance angle of engine ignition again, reduce the overall output capability of motor.Therefore, rationally the design of intake manifold air passage structure, not only will reduce air inlet crushing, increases air inflow, more will, by rational structural design, guarantee the uniformity of each cylinder air inlet.
In supercharged engine, be to reduce motor discharge, PCV gas and fuel vapor have respectively one to be in charge of with intake manifold and to be connected, while operation by motor, in the inner negative pressure producing of intake manifold, combination gas body is introduced after intake manifold pressure stabilizing cavity, enter each cylinder combustion and burn.Wherein, the space of PCV gas and fuel vapor joint is arranged, directly affects mixed gas and enters the ratio of each cylinder, and then affect the uniformity of engine combustion acting.Therefore, PCV gas tube joint and fuel vapor pipe joint all require to be arranged in after intake manifold suction port best position in pressure stabilizing cavity.
For example, existing a kind of intake manifold, PCV gas and fuel vapor are introduced by intake manifold pressure stabilizing cavity end face, this is uniformly distributed to each cylinder by being unfavorable for after PCV gas and fuel vapor mix with air inlet (fresh air that each cylinder sucks), has the problems such as each cylinder burning is inhomogeneous, engine luggine is large.
Existing another kind of intake manifold, the preferential fuel vapor pipe joint of arranging, this will be conducive to fuel vapor and mix and be dispensed to each cylinder with air inlet, be dispensed to each cylinder but be unfavorable for that PCV gas mixes with air inlet, have equally the problems such as each cylinder burning is inhomogeneous, engine luggine is large.
Visible, existing intake manifold, due to the restriction of space layout and mould structure, often can only preferentially arrange at most PCV gas tube joint and fuel vapor pipe joint one of them, therefore, can only meet the requirement that wherein a kind of mixed gas mixes with air inlet of PCV gas and fuel vapor, cannot guarantee the uniformity of each cylinder burning, have the phenomenon of attending to one thing and lose sight of another.
Model utility content
Technical problem to be solved in the utility model is the restriction due to spatial structure and mould structure for existing intake manifold, can only meet PCV gas and fuel vapor wherein a kind of mixed gas enter uniformly the requirement of cylinder and cannot guarantee the inhomogeneity defect of each cylinder burning, a kind of engine intake manifold is provided.
It is as follows that the utility model solves the problems of the technologies described above adopted technological scheme:
A kind of engine intake manifold is provided, comprise suction port, pressure stabilizing cavity, multiple air flue, PCV pipe joint and fuel vapor pipe joint, described pressure stabilizing cavity is connected with described suction port, described multiple air flue is connected with described pressure stabilizing cavity, it is characterized in that, described intake manifold also comprises the secondary chamber being communicated with described pressure stabilizing cavity, and described PCV pipe joint and described fuel vapor pipe joint are connected on described secondary chamber.
Further, between described secondary chamber and described pressure stabilizing cavity, be communicated with by one or more connection mouths, the section area sum of the section area of a described connection mouth or multiple connection mouths is greater than the section area sum of described PCV pipe joint and fuel vapor pipe joint.
Further, described multiple connection mouths comprise a middle connection mouth that is positioned at neutral position, described secondary chamber, and described middle connection mouth is of described multiple connection mouths middle section area maximum.
Further, described fuel vapor pipe joint is arranged on the position of close described middle connection mouth on described secondary chamber, and described PCV pipe joint is arranged on the side end away from described fuel vapor pipe joint on described secondary chamber.
Further, described PCV pipe joint is vertical with described fuel vapor pipe joint and extend along the length direction in described secondary chamber.
Further, described multiple connection mouth also comprises one or the second side connection mouth being positioned at one or more first side connection mouths of described middle connection mouth one side and being positioned at described middle connection mouth opposite side.
Further, the section area of described middle connection mouth is greater than the section area sum of section area or multiple first side connection mouths of a described first side connection mouth; The section area of a described first side connection mouth is greater than the section area sum of section area or multiple second side connection mouths of a described second side connection mouth, or the section area sum of described multiple the first side connection mouths is greater than the section area sum of section area or multiple second side connection mouths of a described second side connection mouth.
Further, described intake manifold comprises upper half part and lower half portion, upper half part of described intake manifold is provided with the upper welding muscle rounding, lower half portion of described intake manifold is provided with the lower welding muscle rounding, the welding corresponding to described lower welding muscle of described upper welding muscle is to be connected as a single entity upper half part of described intake manifold and lower half portion, position, the corresponding described secondary chamber of described upper welding muscle forms spaced multiple middle welding muscle, position, the corresponding described secondary chamber of described lower welding muscle forms spaced multiple lower middle welding muscle, described multiple middle welding muscle and the corresponding welding one by one of described multiple lower middle welding muscle, to separate described secondary chamber and described pressure stabilizing cavity in inside and then to form multiple described connection mouths.
According to engine intake manifold of the present utility model, the one secondary chamber being communicated with pressure stabilizing cavity middle part is set, and PCV pipe joint and fuel vapor pipe joint are connected on secondary chamber, like this, PCV gas and fuel vapor enter secondary chamber by PCV pipe joint and fuel vapor pipe joint respectively, enter pressure stabilizing cavity via secondary chamber from pressure stabilizing cavity, make PCV gas, fuel-steam can with enter fresh air in pressure stabilizing cavity and mix after, enter equably each cylinder air flue, thereby guarantee the uniformity of each cylinder burning, solve with this that to have each cylinder burning that existing intake manifold caused inhomogeneous, the problems such as engine luggine is large.
In addition, the utility model also provides a kind of motor, and it comprises above-mentioned engine intake manifold.
Accompanying drawing explanation
Fig. 1 is its flow passage structure schematic diagram of engine intake manifold that the utility model one embodiment provides;
Fig. 2 is its flow passage structure schematic diagram of engine intake manifold that the utility model one embodiment provides;
Fig. 3 is the external shape schematic diagram of the engine intake manifold that provides of the utility model one embodiment;
Fig. 4 is another visual angle figure of Fig. 3;
The structural representation of its upper half part of engine intake manifold that Fig. 5 one embodiment of the invention provides;
The structural representation of its lower half portion of engine intake manifold that Fig. 6 one embodiment of the invention provides.
Reference character in specification is as follows:
1, suction port; 2, pressure stabilizing cavity; 3, air flue; 4, PCV pipe joint; 5, fuel vapor pipe joint; 6, secondary chamber; 61, secondary chamber one side end; 62, secondary chamber end side; 7, connection mouth; 71, middle connection mouth; 72, the first side connection mouth; 73, the second side connection mouth; 8, the welding position of upper middle welding muscle and lower middle welding muscle; 10, upper half part; 11, upper welding muscle; 110, upper middle welding muscle; 20, lower half portion; 21, lower welding muscle; 210, lower middle welding muscle; 31, upper central indentation; 32, upper the first side breach; 33, upper the second side breach; 41, lower central indentation; 42, lower the first side breach; 43, lower the second side breach.
Embodiment
Clearer for technical problem, technological scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is described in further detail.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Its flow passage structure schematic diagram of engine intake manifold that Fig. 1 and Fig. 2 provide for the utility model one embodiment, its external shape schematic diagram of engine intake manifold that Fig. 3 and Fig. 4 provide for the utility model one embodiment.Design core of the present utility model is runner design, and the external shape of intake manifold needs there is other shape that is different from Fig. 3 and Fig. 4 according to difference.
Please with reference to Fig. 1 to Fig. 2, the engine intake manifold that the utility model one embodiment provides, comprise suction port 1, pressure stabilizing cavity 2, multiple air flue 3, PCV pipe joint 4, fuel vapor pipe joint 5 and secondary chamber 6, described pressure stabilizing cavity 2 is connected with described suction port 1, described multiple air flue 3 is connected with described pressure stabilizing cavity 2, described secondary chamber 6 is connected with described pressure stabilizing cavity 2, and described PCV pipe joint 4 and described fuel vapor pipe joint 5 are connected on described secondary chamber.PCV pipe joint 4 is connected with bent axle forced ventilation system, for passing into the mixed gas of crankcase.Fuel vapor pipe joint 5 is connected with canister, the fuel vapor sucking from fuel tank for passing into canister.The quantity of air flue 3 is corresponding with the quantity of cylinder, that is to say it can is three air flues (three cylinders), four air flues (four cylinders) and six air flues (six cylinders) etc.Fig. 1 to 4 is depicted as the intake manifold of four cylinder engine.
In the present embodiment, take into account welding muscle width requirement, between described secondary chamber 6 and described pressure stabilizing cavity 2, be communicated with by three connection mouths 7, it is respectively the middle connection mouth 71 that is positioned at neutral position, described secondary chamber, be positioned at described in the middle of connection mouth 71 1 sides the first side connection mouth 72 and be positioned at described in the middle of the second side connection mouth 73 of connection mouth 71 opposite sides, described the first side connection mouth 72 arranges near PCV pipe joint 4, described the second side connection mouth 73 arranges away from PCV pipe joint 4, connection mouth 71 in the middle of described, section area (gas flow area) sum of the first side connection mouth 72 and the second side connection mouth 73 is greater than section area (gas flow area) sum of described PCV pipe joint 4 and fuel vapor pipe joint 5.
In the present embodiment, as shown in Figures 5 and 6, described intake manifold comprises upper half part 10 and lower half portion 20, upper half part 10 of described intake manifold is provided with the upper welding muscle 11 rounding, lower half portion 20 of described intake manifold is provided with the lower welding muscle 21 rounding, described upper welding muscle 11 and the corresponding welding of lower welding muscle 21 are to be connected as a single entity upper half part of described intake manifold 10 and lower half portion 20, 6 positions, described upper welding muscle 11 corresponding described secondary chamber form spaced two upper middle welding muscle 110, muscle 210 is welded in the middle of forming under spaced two in 6 positions, described lower welding muscle 21 corresponding described secondary chamber, described two upper middle welding muscle 110 and middle welding muscle 210 corresponding welding one by one under described two, to separate described secondary chamber 6 in inside with described pressure stabilizing cavity 2 and then to form three described connection mouths 7.Welding position 8 in Fig. 1 is the welding position of corresponding upper middle welding muscle 110 with lower middle welding muscle 210.
Particularly, as shown in Figures 5 and 6, two upper in the middle of between welding muscle 110 interval form 31, two of central indentation upper in the middle of welding muscle 110 form the first side breach 32 and upper the second side breach 33 with the other interval of upper welding muscle 11 remaining parts; In the middle of under two between welding muscle 210 interval form under 41, two of lower central indentation in the middle of welding muscle 210 and the other interval of lower welding muscle 21 remaining parts form down the first side breach 42 and the second side breach 43 down; Upper half part 10 of intake manifold and lower half portion 20 welded after, upper central indentation 31 and the middle connection mouth 71 of the common formation of lower central indentation 41, upper the first side breach 32 and the common first side connection mouth 72 that forms of lower the first side breach 42, upper the second side breach 33 and the common second side connection mouth 73 that forms of lower the second side breach 43.
In the present embodiment, the section area sum of three connection mouths 7 is (reducing stress concentrates) under the prerequisite that guarantees due welding muscle width, can be large as best one can.Like this, can reduce the flow resistance of gas in secondary chamber, strengthen the intake of PCV gas and fuel vapor.In the case of identical circulation area, adopt multiple the connection mouth structures of opening (middle welding muscle), can effectively reduce intake manifold welding muscle stress and concentrate, increase the bursting pressure of intake manifold.
In the present embodiment, the sectional shape of connection mouth 7 is preferably square, to increase to greatest extent circulation area.
In the present embodiment, preferably, described middle connection mouth 71 is of all connection mouth 7 middle section area maximums, described fuel vapor pipe joint 5 is arranged on the position near connection mouth 71 in the middle of described on described secondary chamber 6, described PCV pipe joint 4 is arranged on the side end 61 away from described fuel vapor pipe joint 5 on described secondary chamber 6, and described PCV pipe joint 4 is vertical with described fuel vapor pipe joint 5 and extend along the length direction in described secondary chamber 6.Because middle connection mouth 71 is positioned at neutral position and the section area maximum in secondary chamber 6, like this, most of PCV gas, fuel vapor are all to enter pressure stabilizing cavity 2 middle parts by middle connection mouth 71.In addition, because PCV gas side end 61 away from described fuel vapor pipe joint 5 from secondary chamber 6 enters, flowed by 61Xiang Fu chamber, this end end side 62, there is an initial momentum to secondary chamber end side 62, that is to say that PCV gas more easily assembles in secondary chamber 6 end side 62, therefore, for equilibrium enters the PCV gas of pressure stabilizing cavity 2 and enters the PCV gas of pressure stabilizing cavity 2 from described the second side connection mouth 73 from described the first side connection mouth 72, in the time of design, the section area that described the first side connection mouth 72 is set is greater than the section area of described the second side connection mouth 73.Like this, the fuel vapor being sucked by fuel vapor pipe joint 5 and the PCV gas being sucked by PCV pipe joint, all that major part enters pressure stabilizing cavity 2 middle parts by middle connection mouth 71, small part enters pressure stabilizing cavity 2 middle parts by the first side connection mouth 72 and the second side connection mouth 73, therefore the fresh air that, PCV gas and fuel vapor all can be introduced with suction port 1 is introduced the each cylinder of motor equably.
The working procedure of the intake manifold that above-described embodiment provides is as follows:
Operate under some operating mode at motor, the air flue of intake manifold forms negative pressure, under the effect of pressure reduction, PCV gas and fuel vapor are successively sucked to secondary chamber 6 via PCV pipe joint 4 and fuel vapor pipe joint 5, then enter into pressure stabilizing cavity 2 middle parts by three connection mouths 7 between secondary chamber 6 and pressure stabilizing cavity 2, and the fresh air of introducing with suction port 1 introduced the each cylinder of motor equably, guarantee that with this PCV gas and fuel vapor can be distributed in each cylinder uniformly.
The engine intake manifold that the utility model above-described embodiment provides, the one secondary chamber being communicated with pressure stabilizing cavity middle part is set, and PCV pipe joint and fuel vapor pipe joint are connected on secondary chamber, like this, PCV gas and fuel vapor enter secondary chamber by PCV pipe joint and fuel vapor pipe joint respectively, enter pressure stabilizing cavity via secondary chamber from pressure stabilizing cavity, make PCV gas, the fresh air that fuel-steam can be introduced with suction port 1 is introduced the each cylinder of motor equably, thereby guarantee the uniformity of each cylinder burning, solve with this each cylinder burning that existing intake manifold caused inhomogeneous, the problems such as engine luggine is large.
In other embodiments, the connection mouth that is communicated with described secondary chamber and described pressure stabilizing cavity also one, more than two or four.
In another embodiment, described the first side connection mouth is one, and that the second side is connected to is multiple.In the middle of described, the section area of connection mouth is greater than the section area of a described first side connection mouth; The section area of a described first side connection mouth is greater than the section area sum of described multiple the second side connection mouths.
In another embodiment, described the first side connection mouth is multiple, and the second side is connected to one.In the middle of described, the section area of connection mouth is greater than the section area sum of described multiple the first side connection mouths; The section area sum of described multiple the first side connection mouths is greater than the section area of a described second side connection mouth.
In another embodiment, described the first side connection mouth is multiple, and the second side connection is also multiple.In the middle of described, the section area of connection mouth is greater than the section area sum of described multiple the first side connection mouths; The section area sum of described multiple the first side connection mouths is greater than the section area sum of described multiple the second side connection mouths.
In addition, the utility model also provides a kind of motor, and it comprises above-mentioned engine intake manifold.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.