The forced air-cooling motor that possesses the cooling air guide housing
Technical field
The present invention relates to the inclination cylinder type forced air-cooling motor that constitutes by with crankcase portion and the one-piece type cylinder block of the incorporate crankcase of cylinder part, particularly can effectively guide cooling air to improve the cooling air guide housing of engine cooling effect.
Background technique
For single-cylinder forced air-cooling motor, the air that is applied after the effect by the cooling fan that is installed in crankshaft front end blows out from the opening portion of fan guard, this air is provided with the cylinder and the cylinder head (cylinder head) of radiating fin via cylinder cowl (cylinder cover) guiding periphery, and between the radiating fin through cylinder and cylinder head, countercylinder and cylinder head cool off.As an example of this motor, for example disclosed in the TOHKEMY 2003-56408 communique, as to have used the one-piece type cylinder block of crankcase of cylinder and crankcase integrally casting inclination cylinder engine.This motor is in order to solve the frozen problem of vaporizer, except that cylinder wind scooper (air shield) is set, also append and be provided with the first air draft guide portion and the second air draft guide portion, warm braw after the cooling cylinder is guided to vaporizer, vaporizer is implemented to heat, prevent freezing of vaporizer thus.But described cylinder wind scooper (air shield) or air draft guide portion just around cylinder and cylinder head, do not guide to cooling air crankcase portion, so crankcase portion is by surrounding atmosphere institute natural cooling from its surface.
Fig. 7 represents to tilt another example of cylinder forced air-cooling motor.In Fig. 7, cylinder block 3 is by cylinder part 7 and the 3A of crankcase portion integrally casting and form, and cylinder part 7 is from the crankcase diagonally extending.In the upper end of cylinder part cylinder head 101 is installed, on cylinder head, is provided with valve operation mechanism and is covered by cylinder head cover 102.Be provided with a plurality of radiating fin 2 in described cylinder part 7 and cylinder head place.The 103rd, the relief opening of cylinder head 101, the 104th, spark plug, the 105th, the cylinder wind scooper, the 106th, fuel is guided to the fuel line of fuel filter (with reference to Fig. 5) from fuel tank (not shown).Have, 3a is meant the root (joint of cylinder part 7 and the 3A of crankcase portion) of cylinder part 7 again.4 is the output side shaft of bent axle, at the crankshaft front end of the opposition side (front side) of this output shaft 4 cooling fan (not shown) is installed.Be provided with the secondary blow-off outlet 1b that is used to blow out the air after applying effect by fan in the back of the fan guard 1 that covers this cooling fan, and the part of can't see among the figure relative with cylinder is provided with main blow-off outlet.Cooling air 5 contact cylinder part and cylinder heads from main blow-off outlet blows out by 105 guiding of cylinder wind scooper, through between the radiating fin, are discharged in the ambient atmos after countercylinder portion and cylinder head cool off.A part of 3b of the sidewall of the cooling air 6 contact crankcase 3A of portion that blow out from secondary blow-off outlet 1b is diffused in the ambient atmos of periphery after this part cooled off.Therefore, crankcase portion is just cooled off by local, and major part is by surrounding atmosphere institute natural cooling.So, in existing this motor, be that countercylinder portion and cylinder head are cooled off as emphasis, the part that crankcase portion is connected with cylinder by the cooling air that is blown out by described main blow-off outlet 1a is cooled off, and then considers fewer to the cooling of other parts.
Usually, in this motor, lubricant oil is trapped in the bottom of the 3A of crankcase portion, adopts the protruding member by the front end that is arranged on connecting rod that the what is called that this lubricant oil splashes is splash lubricating system, oil cooler is not set, and the natural cooling via crankcase is depended in the cooling of lubricant oil.
Yet along with small-sized, the high outputization of motor, the production of heat also increases thereupon, on the other hand, exothermic surface area is also reducing, and causes the oil temperature to rise, particularly under the environment that extraneous gas temperature raises, the excessive rising of oil temperature can damage the durability of motor.In addition, in recent years in order to realize lightweight, to make facilitation, cost degradation, parts adopt plastic components mostly, so rise because of the radiations heat energy from the motor outer wall causes the excessive temperature of these parts sometimes, therefore pursue and reduce motor temperature on every side as far as possible.
In this motor, the fuel line from the fuel tank that is configured in motor top to the fuel filter that is configured in the bottom is arranged on cylinder back side (downstream side of cooling air) sometimes.Under this situation,, thereby in conduit, be easy to generate vapour bubble, form fuel by obstacle (sealing gland phenomenon) because of the cooling, air discharging that cylinder cooling temperature rises is heated to fuel line.In order to prevent this phenomenon, also between fuel line and cylinder, shield is set sometimes, cooling, air discharging is carried out the heat blocking.In addition, fuel line is normally by the rubber-like material, the vibration of motor and shake fuel line is rocked, thus contact than higher parts with environment temperature sometimes and sustain damage, even may cause fire because of fuel losses.The fixation method of conduit acts as a fuel, can adopt for example real disclosed method of clear 64-47976 communique of opening of Japan, promptly forming the cross section at the end face of cylinder block is semicircular groove, fuel line is embedded in this groove, and the fixation method that covers with the fuel line cover.
Yet it is semicircular groove etc. that this method need form the cross section at the end face of cylinder block, processes more loaded down with trivial details.
Summary of the invention
In order to address the above problem, the invention provides a kind of forced air-cooling motor, has the cylinder block that constitutes crankcase portion and cylinder part integratedly, and possesses the cooling air guide housing, described cooling air guide housing is: the end at bent axle is equipped with cooling fan, be provided with the main blow-off outlet that blows out the cooling air that countercylinder portion cools off at the position relative of the rear board of the described cooling fan back side of the fan guard that covers this cooling fan with cylinder part, be provided with the secondary blow-off outlet that blows out the cooling air that the part of crankcase portion is cooled off at this main blow-off outlet with respect to the opposition side position in bent axle axle center, this forced air-cooling motor is characterised in that
Possesses the cooling air guide housing, described cooling air guide housing partly is made of cylinder wind scooper part and overhead guard, described cylinder wind scooper partly guides the cooling air that blows out from described main blow-off outlet in order to cool off described cylinder part, described overhead guard partly guides the cooling air that blows out from the described secondary blow-off outlet side side flow along described crankcase portion, after this side is cooled off with the cooling air interflow that described cylinder part is cooled off that blows out from described main blow-off outlet.
According to this structure, can be effectively to originally not considering that the crankcase portion of the small-sized forced air-cooling motor of positive cooling package cooled off.Because the temperature of crankcase is lower than the temperature of the cylinder part of burning in the inner space, so it is low to air ratio countercylinder portion and the cooled air temperature of cylinder head after the cooling of crankcase portion, and then can be used in the cooling of cylinder part, so will it directly not be discharged in the ambient atmos, participate in the cooling of cylinder part and guide to cylinder part, cooling fan can be applied the cooling that cooling air after the effect is used in motor more effectively thus.Thereupon the cooling air that cools off of countercylinder portion and cylinder head downstream the side flow temperature rise, so the downstream side of cylinder part and cylinder head has the inadequate tendency of cooling, but it is lower from the such as described temperature of the cooling air that on the side of crankcase portion, rises of described secondary blow-off outlet, make this cooling air in the mobile way of the cooling air that one side cooling cylinder and cylinder head flow on one side with this cooling air interflow, can improve the cooling in the downstream side of countercylinder portion and cylinder head thus.Its result, the temperature distribution of the circumferencial direction of cylinder is more even, and the distortion of the radial direction of cylinder is more even, has also reduced the consumption of lubricant oil.
In addition, particularly in inclination cylinder type motor, the lateralarea of crankcase portion is that the area of a side is bigger than the area of opposite side, and the crankcase side of the side that area is big is by the positive cooling of cooling air, so can cool off effectively to crankcase portion, the lubricating oil temperature in the crankcase portion can be reduced, and heat affecting can be reduced the member that is installed in periphery.Therefore, can obtain durability, reliability all than higher motor.
Also can be following formation: described cooling air guide housing is formed by vibrational energy absorptivity and the big heat stable resin injection-molded article of heat conduction impedance, and, behind the cooling air of the cylinder root that described cylinder part is connected with crankcase portion, swim side, the described overhead guard part of binding is extended in the two mode of docking with the strap of cylinder wind scooper part, be formed with Embedded Division in this end-to-end joint part, can be by embedding the two cover portions of binding.
If adopt the injection moulding of plastic materials, then can make the guide housing that forms very complicated shape easy and cheaply, and can help to reduce the noise of motor.
And, in the back of the banded extension part of described overhead guard part and cylinder wind scooper part, be provided with groove structure or conduit clamp that the fuel line to the fuel tank that links motor top and fuel filter supports, fixes, perhaps their combination.
Also can be: the overhead guard of described cooling air guide housing part by joggle and described fan guard rear board and be connected at the flange part of the rearward end formation of described crankcase portion, at necessary position by bolt in described cylinder block.In addition, described cylinder wind scooper also can be provided with the tenon member by the side at the opposition side of the side that is covered by described overhead guard of the crankcase portion of cylinder block, by this tenon member joggle.So, described overhead guard and cylinder wind scooper are swum the joggle of side by banded extension part and are linked behind cooling air, as with overhead guard and the incorporate cooling air guide housing of cylinder wind scooper, at necessary position by bolt in described cylinder block, can reduce thus by bolt this guide housing is fixed in the position of cylinder block, thereby can reduce assembling procedure.
Also can be: the fixing fuel line from fuel tank in back of the banded extension part that extends from described overhead guard and cylinder wind scooper that the trip side links by joggle after described overhead guard and cylinder wind-guiding cover in cooling air directly contacts with described fuel line because of the cooling, air discharging that motor is cooled off the temperature rising avoiding.So, by fixing cooling air guide housing reliably, directly contact with the fuel line of avoiding cooling, air discharging and fuel to guide to fuel filter, prevent to produce because of the vibration of motor or shake making fuel line particularly contact the damaged accident that produces repeatedly thus with cooling fan or other surrounding member with fuel tank.
The cooling air guide housing of Gou Chenging can be easily mounted on the motor as mentioned above, and can implement at short notice to install, and reduces assembling procedure significantly.And, by this guide housing is set, can improve the cooling effect of motor comprehensively, improve the durability of motor, suppress the vibration of cover, and reduce noise.
Description of drawings
Fig. 1 is the schematic representation that flows that the cooling air in the engine main body of the present invention has been used in expression.
Fig. 2 is that expression is observed the rear view of having used engine main body of the present invention from the output shaft side, is used to represent flowing of cooling air.
Fig. 3 (A) is the side view of expression from the engine main body of P direction observation Fig. 2, is used to represent flowing of cooling air.
Fig. 3 (B) is the figure that takes off overhead guard and observe from the P direction equally.
Fig. 4 is a plan view of observing the engine main body of Fig. 2 from the Q direction, is used to represent flowing of cooling air.
Fig. 5 (A) is a side view of observing the engine main body of Fig. 2 from the R direction, is used to represent flowing of cooling air.
Fig. 5 (B) is the figure that takes off the cylinder wind scooper and observe from the top.
Fig. 6 is the stereogram of the general structure of expression cooling air guide housing of the present invention.
Fig. 7 is the stereogram of existing engine main body, is used to schematically show flowing of cooling air.
Embodiment
Below, with reference to accompanying drawing, be elaborated to most preferred embodiment of the present invention is exemplary.But the size, material property, shape of record member of formation in this embodiment with and configuration etc. relatively, just special specific record, and and non-limiting scope of the present invention, only be an illustrative examples.
Fig. 1 is a stereogram of having used engine main body of the present invention, the state when represented is fuel tank, air cleaner, baffler, control gear etc. are removed, and marked flowing of cooling air.
In Fig. 1, the 13rd, the cylinder block that crankcase is one-piece type is made of cylinder part 27 and the 13A of crankcase portion that forms as one with it.The 21st, be fastened on the top cylinder head of described cylinder part 27, the 12nd, the radiating fin of this cylinder part also comprises the radiating fin of cylinder head at this.The 22nd, the relief opening of cylinder head 21, the 23rd, cylinder head cover, the 24th, spark plug.The 14th, the output shaft of crankshaft rear end side is equipped with cooling fan (not shown) at the crankshaft front end of the opposition side (front side) of this output shaft.The 11st, fan guard, the rear board of this fan guard are installed on the described cylinder block 13.The 17th, link the fuel line of not shown fuel tank and not shown fuel filter, the 20th, the cylinder wind scooper.The 10th, overhead guard, this overhead guard are shown in the stereogram of Fig. 6, cover left lateral sides and upper surface with the described crankcase 13A of portion among the figure, and then cover the radiating fin of cylinder part 27 and extend to the radiating fin of cylinder head.Overhead guard 10 extends to the rearward end of the 13A of crankcase portion from the rear board of fan guard 11 on crankshaft direction, distolateral thereafter by joggle in the flange plate place that is arranged on this rearward end, its forward end is by the rear board of joggle in fan guard 11.And, be formed with the space of cooling air between the left side periphery of left lateral sides, upper surface and the radiating fin of this overhead guard 10 and crankcase portion by usefulness.Rear board place at described fan guard 11, be formed with main blow-off outlet 11a (with reference to Fig. 4) at the part opening relative with the radiating fin 12 of described cylinder part and cylinder head, the lower portion in the space between the described side of described overhead guard 10 and crankcase portion the face portion opening is formed with secondary blow-off outlet 11b.
Fig. 2 is a rear view of observing the motor of Fig. 1 from output shaft 14 sides, and the formation identical with Fig. 1 marked same-sign.The 19th, fuel line 17 is fixed on the conduit clamp of the linking department of cylinder wind scooper 20 and overhead guard 10, the joint end of 18 these linking departments of expression describes in detail in the explanation of Fig. 6 this.
Fig. 3 (A) is the side view that the P direction from Fig. 2 is observed, and the formation identical with Fig. 1, Fig. 2 marked same-sign.Fig. 3 (B) is the figure that takes off overhead guard 10 and observe from the P direction equally.Tenon part 10a, the 10b of the overhead guard 10 of the rearward end joggle of the 13A of crankcase portion that shows at the rear board of fan guard 11 and cylinder block 13, in the mortise of the rear board of tenon part 10a embedding fan guard 11, in the mortise of the flange part of the rearward end of the tenon part 10b embedding crankcase 13A of portion.
Fig. 4 is the side view that the Q direction from Fig. 2 is observed, and the formation identical with Fig. 1~Fig. 3 marked identical symbol.The 25th, manually boot the handle of rope, the 26th, vaporizer, the 27th, control ring (control link) class.11c is mounted in the cooling fan of crankshaft front end.
Fig. 5 (A) is the side view that the R direction from Fig. 2 is observed, and the formation identical with Fig. 1~Fig. 4 marked identical symbol.26a is the flange plate that is used to link the vaporizer 26 of sucking pipe (not shown).The 28th, fuel filter.Because of gravity passes through the fuel that fuel line 17 is delivered to fuel filter 28 from fuel tank (not shown), filter after the fuel line 29 of overflash device side is supplied with vaporizers 26 by this filter.26a is the flange plate that is used to link the vaporizer 26 of sucking pipe (not shown).20c is the front side guide member that constitutes cylinder wind scooper 20, and the cylinder wind scooper 20 that forms as one by joggle.Fig. 5 (B) is the figure that takes off cylinder wind scooper 20 and observe from the top, there is shown tongue-and-groove member 20a, 20b in the cylinder wind scooper 20.The tenon member that is arranged at cylinder block is embedded tongue-and-groove member 20a, so that cylinder wind scooper 20 is fixed in cylinder block 27, with the front side guide member 20c embedding tongue-and-groove member 20b of cylinder wind scooper, to constitute the front side targeting part of described cylinder wind scooper 20.
Fig. 6 is the stereogram of the general structure of expression cooling air guide housing, and the formation identical with Fig. 1~Fig. 5 marked identical symbol.In overhead guard portion 10 and cylinder wind scooper portion 20, on the face of the crankcase portion of the rear side (cooling air downstream side) of the cylinder root that cylinder part 27 is connected with the 13A of crankcase portion, be extended with the downstream of crosscut cylinder cooling air respectively and crooked strap 10c and 20d, the end 18 of these banded extension parts links by joggle and constitutes the cooling air guide housing.And, trailing flank (downstream side of cooling air 15) intercalating dye conduit 17 at the banded extension part of these bendings, groove 10a, the 20a of preferred cross-sections circular arc are set respectively, also be provided with respectively from groove two side-prominent, have an a pair of jut (clamp portion) 19,19 less than the interval of fuel line external diameter, by fuel line being pressed into described groove, fuel line is fixed reliably by described jut clamping.
Have again, also described groove 10a, 20a can be set, implement to clamp at the rear side surface of described curved part.And, can also make described clamp portion 19,19 outstanding from the rear side surface of described curved part, by fuel line 17 is pressed between this protuberance, keep fuel line reliably.If as described groove 10a, 20a are set like that, then can reduce the height of described projection, have the advantage that danger that projection loses disappears.Certainly, as described clamp, also can adopt the existing known clamp outside the described a pair of jut.
28, the 29th, be used for tapped hole that overhead guard portion and cylinder wind scooper portion 20 are fixed on the cylinder block, certainly, also can beyond diagram, append in addition as required.
Being flowing among Fig. 1, Fig. 2, Fig. 4 of cooling air represented by the index line of thick dashed line, represented by the index line of double dot dash line in Fig. 6.
With reference to Fig. 1, Fig. 2, Fig. 4, Fig. 6, the mobile of cooling air described, the cooling air 15 that blows out from the main blow-off outlet 11a of the rear board that is arranged on fan guard 11, between the radiating fin 12 through cylinder part 27 and cylinder head 21, countercylinder and cylinder head cool off, and discharge from the motor rear side then.At this moment, cooling air 15 is by cylinder wind scooper 20 guiding of the R side among Fig. 2.
On the other hand, from the cooling air 16 that the secondary blow-off outlet 11b of the rear board that is arranged on fan guard 11 blows out, enter overhead guard 10 and by the space between the side side of the 13A of crankcase portion of its covering.Overhead guard 10 is shown in Fig. 3 (A), by tenon 10a joggle in the rear board of fan guard 11, and by the flange plate of tenon 10b joggle in the rear end side (output shaft 14 sides) of the 13A of crankcase portion, its left and right end portions of space and underpart between the described side side of overhead guard and crankcase portion are airtight, and be only open towards cylinder part and cylinder head side along the direction of the wall of crankcase portion.Therefore, cooling air 16 rises along the sidewall of crankcase portion.In addition, airtight under the described joggle effect also can be incomplete.That is, even leaky, cooling air 16 also can rise along sidewall surfaces.This cooling air 16 is shown in cooling air 16b, be directed to the part that overhead guard 10 covers cylinder part 27 and cylinder head 21, contact with cylinder head with cylinder part, and collaborate, be discharged to the motor rear with this cooling air with the part of the cooling air 15 that blows out from described main blow-off outlet 11a.That is, the cooling air that blows out from secondary blow-off outlet 11b enters from the side between the radiating fin of cylinder part and cylinder head after one side side of crankcase portion and upper surface are cooled off, and supports the cooling of cylinder and cylinder head.The ratio of the opening area by main blow-off outlet 11a of suitable setting and secondary blow-off outlet 11b can make the cooling air 15 and the flow proportional of cooling air 16 be suitable for the comprehensive cooling of motor most.
As shown in Figure 6, from the cooling air 15 inflow engine rears (left side the figure) that described main blow-off outlet 11a blows out, the cooling air 16 that blows out from secondary blow-off outlet 11b collaborates inflow engine rear, back at the side of crankcase portion liter and with described cooling air 15, so banded extension part 10c at overhead guard 10 and cylinder wind scooper 20,20d, banded extension part 10b, the fuel line 17 that the back of 20b is fixing, by banded extension part 10b, 20b hides, thereby the cooling air in the downstream side of can be not directly not rising with temperature contacts, and keep reliably by overhead guard 10 and cylinder wind scooper 20, so can or not shake and rock because of the vibration of motor, contact with radiating fin or other surrounding member, thereby can prevent that fuel line 17 from producing damaged accident.
In addition, described overhead guard 10 and cylinder wind scooper 20 can be made by the injection moulding of heat stable resin.If adopt the injection moulding of plastic materials, then can make the member that forms very complicated shape easy and cheaply, and can help to reduce the noise of motor.