CN103089475A

CN103089475A - Air suction device of engine

Info

Publication number: CN103089475A
Application number: CN2012104282718A
Authority: CN
Inventors: 杉浦规郎; 广田健太郎; 河内洋文
Original assignee: Fuji Heavy Industries Ltd
Current assignee: Subaru Corp
Priority date: 2011-11-04
Filing date: 2012-10-31
Publication date: 2013-05-08
Anticipated expiration: 2032-10-31
Also published as: JP5552105B2; CN103089475B; JP2013096360A

Abstract

The present invention provides an air suction device of an engine, which reinforces air flow in a cylinder and enlarges the amount of sucked air and can be easily applied for the prior-art cylinder cap. The air suction device (1) of the engine is constructed to possess the following components: the cylinder cap (100) which is provided with an air suction channel (120) that guides the air into a cylinder C; and a heat insulator (200) which is connected with an inlet part of the air suction channel and guides the air into the air suction channel, wherein the air suction channel is provided with a bending part (123) of which the direction is changed to a combustion chamber side next to the end of the combustion chamber side. Furthermore the air suction channel is internally provided with a rectifier board (210) which is equipped closer to the upstream side than the bent part and is adjacent to the inner circumferential surface of the cylinder side. Furthermore the rectifier board (210) is integrated with a heat insulation board in a manner that the projection amount from the inner circumferential surface continuously enlarges from the upstream side to the downstream side.

Description

The suction means of motor

Technical field

The present invention relates to the suction means of motor, especially relate to the gas flow in stiffened cylinder and increase the air amount amount, and can easily be applicable to the engine air-suction apparatus of existing cylinder head.

Background technique

From the viewpoint that reduces costs, industry is not the LP casting of using etc. by automobile usually with the cylinder head that waits general purpose engine but forms by die casting.

Therefore, air intake passage (inhaling mood Port one ト) also need to be designed to consider to adopt the shape of die casting manufacturing, due to the entering side (vaporizer side) and go out minute mould of side (combustion chamber side) of air intake passage, mostly form the shape with the curved part that bends to sharp approximate right angle.

When there is this curved part in air intake passage, can cause the pumping property of motor in edge part mobile is stripped from, rolls the cylinder of stream (タ Application Block Le) etc. gas flow to reduce or air mass flow such as can reduce at the impact.

Prior art as the suction means that relates to this general purpose engine, for example record following motor in patent documentation 1, namely, take the inhalation resistance that reduces motor as purpose, the part of the heat insulator of the hot use of blocking-up that is arranged between cylinder head and vaporizer is extended in cylinder head, consist of the part of air intake passage, thereby make the crooked level and smooth of air intake passage.

The prior art document

Patent documentation

Patent documentation 1: TOHKEMY 2007-192176 communique

But, in the technology that patent documentation 1 is put down in writing, although can reduce inhalation resistance, strengthen about gas flow in the cylinder that the improvement of burning is effectively rolled stream etc., almost do not consider.

In addition, the Technology Need that patent documentation 1 is put down in writing designs cylinder head and insulator as the parts peculiar that must be used in combination, and for example can not use according to repacking part (Hou is paid け) existing cylinder head.

Summary of the invention

Problem of the present invention is to provide a kind of suction means of motor, the gas flow in its stiffened cylinder and increase the air amount amount, and can easily be applicable to existing cylinder head.

The present invention solves above-mentioned problem by following solution.

First aspect present invention provides a kind of suction means of motor, comprising: cylinder head, and it has air is imported air intake passage in cylinder; Insulator, it is connected with the entrance part of described air intake passage, and air is imported described air intake passage, wherein, described air intake passage is formed with to described combustion chamber side near the end of combustion chamber side and changes nyctitropic curved part, and has current plate in described air intake passage, described current plate than described curved part more by the upstream side of gas flow direction and be adjacent to described air intake passage cylinder side inner peripheral surface and arrange, and the mode and the described insulator that increase continuously from upstream side to downstream side with the overhang from described inner peripheral surface form as one.

According to the present invention, in the zone of high valve stroke, by current plate, make main flow direction avoid the direction deflection at the edge of curved part, therefore suppressed the air-flow of edge part and peeled off, make the flow increase of Aspirating valves front.

In addition, in the zone of low valve stroke, by current plate, can air intake passage formed up and down current difference, therefore strengthened rolling stream and improve burning in cylinder.

And then, have the insulator of this current plate, can be applicable to existing cylinder head according to the repacking part, also can easily adopt for the machine in producing.

Second aspect present invention is based on the suction means of the motor of first aspect present invention, and wherein, the surface in the main flow side of described air of described current plate can form in fact plane.

According to the present invention, utilize simple shape just can suppress the edge part of air-flow and curved part, the interference of seat portion, thereby obtain good pumping property.

Third aspect present invention is based on the suction means of the motor of first aspect present invention, and wherein, the end in the downstream side of described current plate can be formed with along the straight edge part that extends with the direction of the length direction quadrature of described air intake passage.

Fourth aspect present invention is based on the suction means of the motor of third aspect present invention, wherein, the edge part of described current plate can than described curved part more by in the zone of upstream side, leave the inner peripheral surface of described air intake passage and configure.

The invention effect

As discussed above, according to the present invention, but the gas flow in stiffened cylinder can be provided and increase the air amount amount, and can easily be applicable to the suction means of the motor of existing cylinder head.

Description of drawings

Fig. 1 is embodiment's the schematic local section stereogram of having used the suction means of motor of the present invention;

Fig. 2 means that the die casting of the air intake passage section on embodiment's cylinder head divides the schematic diagram of mould;

Fig. 3 means the schematic diagram of the Air Flow in the air intake passage of comparative example of the present invention;

Fig. 4 means the schematic diagram of the Air Flow in embodiment's air intake passage, and means the figure of high valve stroke state;

Fig. 5 means the schematic diagram of the Air Flow in embodiment's air intake passage, and means the figure of low valve stroke state;

Fig. 6 means the chart of the correlation of valve stroke in embodiment and comparative example and gettering quantity (mass flow rate);

Fig. 7 means the valve stroke in embodiment and comparative example and rolls stream than the chart of the correlation of (タ Application Block Le ratio);

Fig. 8 means that the rotating speed of the motor in embodiment and comparative example and the output (full Open Time when opening foot exert oneself) the chart of correlation;

Fig. 9 means the chart of the correlation of the Rate of load condensate of the motor in embodiment and comparative example and THC discharge capacity.

Symbol description

1 suction means 100 cylinder head

110 firing chamber 120 air intake passages

121 upstream portion 122 downstream portions

123 curved part 130 Aspirating valvess

200 insulator 201 cylinder head are installed facial

202 vaporizers are installed facial 203 air suction way sections

Facial on 210 current plates 211

212 edge parts

Embodiment

The present invention will be by leaping the edge part of air intake passage curved part and mobile mode is carried out fin (ヒレ) shape of rectification or current plate and the insulator of diving tower shape forms as one with mixed gas, but solving provides the gas flow in a kind of stiffened cylinder and increases the air amount amount, and can easily be applicable to the problem of the engine air-suction apparatus of existing cylinder head.

Below, the embodiment of the suction means (being designated hereinafter simply as " suction means ") of having used motor of the present invention is described.

Embodiment's suction means for example imports new gas (combustion air) in the general petrolic cylinder of four-stroke OHC single cylinder.

Fig. 1 is the schematic local section stereogram of embodiment's suction means.

As shown in Figure 1, suction means 1 has cylinder head 100 and insulator 200 formations.

Cylinder head 100 is located at the end of the cylinder block with cylinder C (with reference to Fig. 2), except firing chamber 110, air intake passage 120, Aspirating valves 130 (with reference to Fig. 4, Fig. 5 etc.), also possess not shown exhaust passage, outlet valve, spark plug, and the moving valve activator of driving Aspirating valves and outlet valve etc.

Firing chamber 110 is with the recessed precedent of the end face of the cylinder side of cylinder head 100 (in Fig. 1 following) such as bathtub shape and form.

Air intake passage 120 is that the mixed gas (fuel of air and vaporization) that will generate in not shown vaporizer imports the stream in firing chamber 110.

Air intake passage 120 has curved part 123 between upstream portion 121 and downstream portion 122.

Upstream portion 121 is will import from the mixed gas of vaporizer supply the part of cylinder head 100 via insulator 200 is interior, and tilts and configure with respect to the cylinder axis axle direction.

For example, in the situation that the cylinder axis axle direction is the motor of substantially vertical configuration, upstream portion 121 tilts than the high mode of downstream portion 122 sides with insulator 200 sides.

Downstream portion 122 is that the mixed gas that will import from upstream portion 121 imports the part of firing chamber 110, and configures with cylinder axis axle direction almost parallel.

In the end of the firing chamber of downstream portion 122 110 sides, be formed with the valve seat with the periphery edge butt of Aspirating valves 130.

Cylinder head 100 forms by aluminium die casting.

Fig. 2 means that the die casting of air intake passage section of embodiment's cylinder head divides the schematic diagram of mould.

As shown in Figure 2, the part (part that represents with the single-point line in Fig. 2) that forms the upstream portion 121 of air intake passage 120 in metal pattern is pulled out to insulator 200 sides along the length direction of upstream portion 121, and the part (part that Fig. 2 dots) that forms downstream portion 122 is pulled out downwards along the central axis direction of cylinder.

Due to this minute mould, be formed with the curved part 123 with sharp keen edge part between the upstream portion 121 of air intake passage 120 and downstream portion 122.

Fig. 4, Aspirating valves 130 shown in Figure 5 are valves that the end with firing chamber 110 sides of air intake passage 120 opens and closes.

Aspirating valves 130 consists of by from the central authorities of discoid valve body roughly, columned valve rod being set erectly.

Insulator 200 is located between cylinder head 100 and not shown vaporizer, suppresses the heat conduction from engine body to vaporizer, thereby prevents the overheated of vaporizer.

Insulator 200 is by such as synthetic resin etc., and the material that thermal conductivity ratio cylinder head 100 is low is integrally formed.

Insulator 200 has cylinder head and facial 201, vaporizer is installed is installed facial 202 and air-breathing stream section 203.

Cylinder head installation facial 201 is the face that is fixed in the general plane shape of the entrance part of the air intake passage 120 of cylinder head 100.

It is to be located at cylinder head facial 201 opposite side is installed that vaporizer installs facial 202, and is the face of general plane shape that is fixed with the lip part of not shown vaporizer.

Air-breathing stream section 203 installs facial 202 from vaporizer and penetrates into cylinder head and install facial 201 and forms, and the mixed gas importing air intake passage 120 that vaporizer is generated.

In addition, be provided with the flap-like of following explanation or the current plate 210 of diving tower shape on insulator 200.

Current plate 210 is installed facial 201 side-prominent and form to cylinder head 100 from cylinder head, and is inserted in the upstream portion 121 of air intake passage 120.

The inner face of the cylinder side of current plate 210 and the upstream portion 121 of air intake passage 120 (as shown in Figure 1, when configuring the cylinder axis axle direction below) in abutting connection with configuration vertically.

Upper facial 211 (faces relative with cylinder) of the main flow of the contact mixed airflow of current plate 210 form in fact plane, and the mode that increases continuously from upstream side to the downstream side of the flow direction of mixed gas with the distance of the inner face of the upstream portion 121 of distance air intake passage 120 is with respect to the interior face tilt of upstream portion 121 and configure.In addition, the face of section's 211 opposite sides in the above suitably is provided for guaranteeing the stiffening rib etc. of the enhancing use of rigidity and intensity.

The end in the downstream side of current plate 210 is formed with along the straight edge part 212 that extends with the direction of the length direction quadrature of air intake passage 120.

This edge part 212 than curved part 123 more by in the zone of upstream side, leave the inner face of upstream portion 121 and configure.

In addition, the length of current plate 210, angle etc. are according to suitably setting as the characteristic of the motor of applicable object.

Below, with the effect of above-described embodiment, comparing with the comparative example of the present invention that describes below describes.

In addition, in comparative example, for the local surcharge in fact is identical with above-described embodiment symbol and description thereof is omitted.

The suction means of comparative example does not arrange the current plate 210 of the insulator 200 in above-described embodiment.

Fig. 3 means the schematic diagram that flows of the air in the air intake passage of comparative example.

In comparative example, because air intake passage 120 has curved part 123, so can produce peeling off of air-flow at the edge part of the inboard of curved part 123, the flow of Aspirating valves 130 fronts reduces.

Fig. 4 means the schematic diagram that flows of the air in embodiment's air intake passage, and means the figure of high valve stroke state.

In an embodiment, leap the edge part of curved part 123 due to the main flow of being partial to because of current plate 210, therefore, suppressed the air-flow in the edge part and peeled off, make the flow increase of Aspirating valves 130 fronts.

Fig. 5 means the schematic diagram of the Air Flow in embodiment's air intake passage, and means the figure of low valve stroke state.

In an embodiment also can be when low lift because the reduction of the flow velocity air intake passage 120 in is created in the impact that the air-flow at the edge part place of curved part 123 is peeled off.

But, owing to there being current plate 210, at the current difference that forms up and down air-flow of air intake passage 120, can realize that therefore the stream that rolls in cylinder is strengthened.

Below, with reference to Fig. 6～Fig. 9, the test result of embodiment and comparative example is described.

Fig. 6 means the chart of the correlation of the valve stroke of embodiment in steady flow test and comparative example and gettering quantity (mass flow rate).

In Fig. 6, transverse axis represents the lift amount of Aspirating valves 130, and the longitudinal axis represents mass flow rate.

As shown in Figure 6, in an embodiment, be high lift zone more than 6mm in valve stroke, compare comparative example, can make mass flow rate increase more than 5%.

Fig. 7 means embodiment and the valve stroke of comparative example and the chart of the correlation of rolling the stream ratio in the steady flow test.

In Fig. 7, transverse axis represents the lift amount of Aspirating valves 130, and the longitudinal axis represents to roll the stream ratio.

As shown in Figure 7, in an embodiment, valve stroke be about 2～6mm low～middle lift zone, compare with comparative example, can improve significantly and roll the stream ratio.

When the operation of the motor of reality, because the state of low valve stroke and the state of high valve stroke are periodically repeated, therefore obtain simultaneously the increase of above-mentioned inspiratory flow and roll stream than the effect that improves.

The chart of the correlation of the output when Fig. 8 means the rotating speed of the motor in embodiment and comparative example and standard-sized sheet.

In Fig. 8, transverse axis represents engine speed, and the longitudinal axis represents axle output.

As shown in Figure 8, as can be known more than 3200rpm in～high rotary area, compare with comparative example, the output of axle in embodiment improves.

In Fig. 9, transverse axis represents the Rate of load condensate of motor, and the longitudinal axis represents the THC discharge capacity.

As shown in Figure 9, compare with comparative example as can be known, all load areas in an embodiment, the THC discharge capacity reduces, and combustion regime is improved.

As described above, according to the present embodiment, in the zone of high valve stroke, the main flow of mixed gas is by means of the direction deflection of current plate 210 to the edge of avoiding curved part 123, therefore, suppressed the air-flow of edge part 123 and peeled off, thereby the flow of Aspirating valves 130 fronts increases.

In addition, the zone in low valve stroke utilizes current plate 210 at the current difference of formation up and down of air intake passage 120, therefore, can interior the rolling of stiffened cylinder C flow and the improvement burning.

According to these effects, can realize the raising of exporting and the improvement of waste gas.

In addition, have the insulator 200 of this current plate 210, needn't just process and to use according to the repacking part existing cylinder head 100, even also can easily be used for the machine in producing.Particularly in general purpose engine, use sometimes general cylinder head in a plurality of machines, even but in this case, also needn't apply design alteration to cylinder head and just can carry out to each machine the adjustment of pumping property.

In addition, by current plate 210 and insulator 200 are formed one, number in the time of can not increasing amount of parts and rigger.

(variation)

The invention is not restricted to embodiment discussed above, can carry out all distortion and change, these distortion and change are also in technical scope of the present invention.

For example, the shape of each parts of the suction means of formation motor, structure, material, size, shape etc. are not limited to above-described embodiment, and can suitably change.

Claims

1. the suction means of a motor comprises:

Cylinder head, it has air is imported air intake passage in cylinder; And

Insulator, it is connected with the entrance part of described air intake passage, and air is imported described air intake passage,

Wherein said air intake passage is formed with curved part near the end of combustion chamber side, described curved part changes direction to described combustion chamber side,

Has current plate in described air intake passage, described current plate than described curved part more by the upstream side of gas flow direction and be adjacent to described air intake passage cylinder side inner peripheral surface and arrange, and the mode and the described insulator that increase continuously from upstream side to downstream side with the overhang from described inner peripheral surface form as one.

2. the suction means of motor as claimed in claim 1, wherein, the surface in the main flow side of described air of described current plate forms in fact plane.

3. the suction means of motor as claimed in claim 1, wherein, the end in the downstream side of described current plate is formed with along the straight edge part that extends with the direction of the length direction quadrature of described air intake passage.

4. the suction means of motor as claimed in claim 3, wherein, described edge part than described curved part more by in the zone of upstream side, leave the inner peripheral surface of described air intake passage and configure.