CN101344029A - Radiator for small-sized vehicle - Google Patents

Abstract

A radiator for a small-sized vehicle is disclosed, wherein an engine main unit provided with a water jacket is mounted on a body frame, a radiator is arranged on the side of a crankcase forming a part of an engine main unit, the cooling fan that sucks cooling wind to pass the radiator is attached to one end of a crankshaft and is arranged inside the radiator and a shroud having the exhaust port and covering the cooling fan from the side is provided between the radiator and the crankcase, thereby enhancing cooling efficiency. A current plate 122 for obstructing a flow of cooling wind from a cooling fan 97 to the side of a crankcase 21 in a part corresponding to an exhaust port 108 is fixed not on the sides of the exhaust port 108 and the cooling fan 97 but on the side of the crankcase 21.

Description

Radiator for small-sized vehicle

Technical field

The present invention relates to carry engine main body with water jacket at vehicle body frame, side configuration radiator at the crankcase of a part that constitutes described engine main body, make cooling air attract the cooling fan of cooling air to be installed on an end of the crankshaft that supports freely by described crankcase rotation by this radiator ground, and being disposed at the interior side of described radiator, the guard shield that has the air port and cover described cooling fan from the side is arranged at small-sized vehicle radiator (radiator) device between described radiator and the described crankcase.

Background technique

Know foreign side's configuration radiator that the cooling fan that is provided with at an end of crankshaft is arranged by patent documentation 1, the structure of exhaust port is set at the guard shield that is arranged between crankcase and the radiator and cover described cooling fan from the side.

[patent documentation 1] spy opens the 2005-233012 communique

Yet, in above-mentioned patent documentation 1 in the disclosed structure, with the opposite side configuration generator of the radiator of cooling fan, be formed with annulus in the side of this generator, the fan that is cooled attracts and the cooling air that passed through radiator flows to exhaust port, but also to generator around the annulus side inflow, therefore, hinder circulation smoothly, cause the fan efficiency of cooling fan to the cooling air of exhaust port, therefore, become the essential factor that reduces the cooling effectiveness reduction.

Summary of the invention

The present invention In view of the foregoing makes, and its purpose is to provide and cooling air is circulated to exhaust port swimmingly from cooling fan and realizes the radiator for small-sized vehicle of the raising of cooling effectiveness.

To achieve these goals, the described invention of first aspect is a kind of radiator for small-sized vehicle, it carries the engine main body with water jacket at vehicle body frame F, side configuration radiator at the crankcase of a part that constitutes described engine main body, attract the cooling fan of cooling air to be installed on an end of the crankshaft that supports freely by described crankcase rotation in mode by this radiator, and be disposed at the interior side of described radiator, the guard shield that has exhaust port and cover described cooling fan from the side is arranged between described radiator and described crankcase, it is characterized in that, stop fixedly to be equipped on than described exhaust port and described cooling fan to the current plate of described crankcase side circulation in the part corresponding to rely on the crankcase side place with described exhaust port from the cooling air of described cooling fan.

In addition, the described invention of second aspect except the structure of the described invention of first aspect, is characterized in that described current plate is installed on described guard shield.

The described invention of the third aspect, except first or the structure of the described invention of second aspect, it is characterized in that described current plate forms circular-arc along the rotating locus of the radially outermost end of described cooling fan under the situation of observing from the side.

And then, the described invention of fourth aspect, the structure of the described invention of any aspect except first～the 3rd, it is characterized in that, configuration generator between described cooling fan and described crankcase, the described current plate in the outer side that is disposed at this generator are provided with the reflex part that extends from the interior Zhou Duanxiang crankcase side of this current plate integratedly.

According to the described invention of first aspect as can be known, stop the fan that is cooled to attract and the cooling air that passed through radiator circulates to crankcase side from cooling fan near the exhaust port of guard shield with current plate, cooling air circulates swimmingly to exhaust port, therefore, can improve the cooling effectiveness of radiator.

In addition, according to the described invention of second aspect as can be known, current plate can be installed on guard shield, the guard shield that current plate has been installed is installed on crankcase, therefore, compare with the situation that current plate is installed on crankcase, when cooling fan is installed on crankshaft, the current plate variation causes can improve assembling performance by obstacle.

According to the described invention of the third aspect as can be known, current plate forms circular-arcly under the situation of observing from the side along the rotating locus of the radially outermost end of cooling fan, can stop effectively thus from cooling off the circulation of fan to the cooling air of crankcase side.

And then, according to the described invention of fourth aspect as can be known, opposed by the periphery that makes the reflex part that turns back from the interior Zhou Duanxiang crankcase side of current plate and generator, can a spot of cooling air between circulation generator and current plate not taken place under the situation of turbulent flow, make cooling air logical to the exhaust port effluent more swimmingly.

Description of drawings

Fig. 1 is the left surface figure of small motor cycle type automatic double wheel vehicle.

Fig. 2 is the sectional drawing along the power unit of the 2-2 line of Fig. 1.

Fig. 3 is the part shortcoming profile from observing along the 3-3 alignment apparent direction of Fig. 2.

Fig. 4 is the 4-4 line sectional drawing of Fig. 3.

Fig. 5 is 5 figure to the part shortcoming that apparent direction is observed from Fig. 3.

Fig. 6 is the figure corresponding with Fig. 3 that has omitted under the state of radiator box and radiator.

Fig. 7 is the figure that guard shield and radiator are observed from the 7-7 alignment apparent direction of Fig. 4.

Fig. 8 is the 8-8 line sectional drawing of Fig. 3.

Among the figure: the 21-crankcase; The 33-engine main body; The 34-crankshaft; The 95-generator; The 96-radiator; The 97-cooling fan; The 98-guard shield; The 108-exhaust port; The 122-current plate; The 122a-reflex part; The 125-water jacket; The F-vehicle body frame.

Embodiment

Below, based on one embodiment of the invention shown in the drawings, embodiments of the present invention are described.

Fig. 1～Fig. 8 represents one embodiment of the invention, Fig. 1 is the left surface figure of small motor cycle type automatic double wheel vehicle, Fig. 2 is the sectional drawing along the power unit of the 2-2 line of Fig. 1, Fig. 3 is the part shortcoming profile from observing along the 3-3 alignment apparent direction of Fig. 2, Fig. 4 is the 4-4 line sectional drawing of Fig. 3, Fig. 5 is 5 figure to the part shortcoming that apparent direction is observed from Fig. 3, Fig. 6 is the figure corresponding with Fig. 3 that has omitted under the state of radiator box and radiator, Fig. 7 is the figure that guard shield and radiator are observed from the 7-7 alignment apparent direction of Fig. 4, and Fig. 8 is the 8-8 line sectional drawing of Fig. 3.

At first in Fig. 1, possess as the vehicle body frame F of the small motor cycle type automatic double wheel vehicle of dilly: can the supporting of steering ground with in the mode of underpart axle supporting front-wheel WF across the front fork 11 of this front-wheel WF and be linked to the head pipe 13 of steering steering wheel 12 of the upper end of this front fork 11; Under the rear lower side, land the cylindric person in charge 14 who extends from this pipe 13; Combine with this person in charge's 14 bottom, and the low framework 15 of the pairing left and right of rearward extending Link two low frameworks 15 ... rearward end between four-way pipe 16; Front end and the two end part of this four-way pipe 16 are connected the pairing left and right afterframe pipe 17 of setting respectively At described two low frameworks 15 ... the top link intermediate portion and two afterframe pipes 17 of the described person in charge 14 ... the upper frame 18 of intermediate portion ...

Described low framework 15 ... utilize the bottom left and right sides of solder bond in the described person in charge 14, and extend in two sides, and then, lateral bending song in the wings, and rearward be formed extended at both sides these low frameworks 15 ... rearward end utilize the left and right sides two end part of solder bond in described four-way pipe 16.

Two afterframe pipes 17 in vehicle body frame F ... the front portion can swing up and down the power unit P that twelve Earthly Branches are contracted the transmission device M of water cooling type single inflator motor E that draws together the front side that is disposed at trailing wheel WR and the left side side that is disposed at trailing wheel WR, trailing wheel WR axle is supported on the rear portion of power unit P.

Described transmission device M links the crankcase 21 that is arranged at motor E, and be contained in the transmission case 22 that extends in the left side side of trailing wheel WR, at the rear portion and the pairing left and right afterframe pipe 17 of this transmission case 22 ... in the afterframe pipe 17 in left side between be provided with back buffer cell 23.

At described two afterframe pipes 17 ... and described two upper frames 18 ... between dispose the article receiving portion 24 that can accommodate helmet etc., and this article receiving portion 24 extends to the place ahead of this motor E from the top of described motor E, and the seat 25 of using by bus that the rear portion of this article receiving portion 24 is configured in the rear of described head pipe 13 covers from the top.In addition, the rear in described article receiving portion 24 is at two afterframe pipes 17 ... the rear portion between dispose by the described fuel tank 26 that covers from the top by bus with the rear portion of seat 25, article receiving portion 24 and fuel tank 26 are supported by vehicle body frame F.

In addition, the part of described motor E, vehicle body frame F, article receiving portion 24 and fuel tank 26 are covered by car body cover 29, are used for using the pairing left and right pedal 27 of the pin mounting of the passenger on the seat 25 by bus ..., with at two pedals 27 ... between upward the protuberance tunnel, floor portion 28 be formed at described car body cover 29.

Described floor tunnel portion 28 comprises: with by pairing left and right upper frame 18 ... the mode that supports links and is arranged at described two pedals 27 ... the inner, and rise upward, and the tunnel principal part 30 of the part of open upper part and can open and close the cover 31 of upper opening portion of this tunnel principal part 30 of ground locking, the front portion of described article receiving portion 24 is contained in this tunnel, floor portion 28.

; be used for to open and close the linkage (not shown) that seat 25 is used in supporting by bus described being provided with between the anterior and described person in charge 14 with seat 25 by bus; by bus with seat 25 in order to carry out accommodating and taking out to the article such as the helmet of described article receiving portion 24; can rotate towards the place ahead oblique upper; for the top of the front portion of described article receiving portion 24 is open, described cover 31 with together rotate with seat 25 by bus.

In Fig. 2 and Fig. 3, the engine main body 33 of motor E possesses: rotation supporting freely has the crankcase 21 of the crankshaft 34 of the axis that extends on the width direction of vehicle body frame F; Have cylinder thorax 35, and the cylinder block 36 that combines with described crankcase 21; The cylinder head 37 that combines with cylinder block 36; The housing 38 that combines with cylinder head 37, described crankcase 21 is combining with left case halfbody 39 and right case halfbody 40 with the junction plane of the orthogonal axe of described crankshaft 34.

Such engine main body 33, so that the axis of described cylinder thorax 35 rises and roughly along the mode of the fore-and-aft direction of vehicle body frame F to the front upper place slightly, be equipped on vehicle body frame F, the pairing left and right support 41 that is provided with at the back upper lateral part of described crankcase 21 ... via fulcrum 43 and yielding rubber 44 ... can swingingly be supported on the afterframe pipe 17 in vehicle body frame F ... the supporting post 42 that is provided with of intermediate portion ...

The piston 48 that moves the inside that is embedded in described cylinder thorax 35 freely that can slide is linked to crankshaft 34 via connecting rod 49.Rotate supporting cam wheel axle 50 freely at cylinder head 37, suction pump that is provided with at cylinder head 37 and exhaust pump (not shown) are by described camshaft 50 driven for opening and closing.Accommodate timing chain 52 in the chain path 51 that the right case halfbody 40 of described crankcase 21, cylinder block 36 and cylinder head 37 are provided with, this timing chain 52 is wound on driving sprocket wheel 53 that is arranged at crankshaft 34 and the driven sprocket 54 that is arranged at camshaft 50.Thus, the rotating power of crankshaft 34 is transmitted to camshaft 50 with 1/2 reduction speed ratio.

The downstream of the sucking pipe 55 that the upper portion side wall of described cylinder head 37 is crooked with extend ground rearward from this cylinder head 37 is connected, and at this sucking pipe 55 Fuelinjection nozzle 56 is installed.In addition, the upstream extremity of sucking pipe 55 is connected with the chain wheel body 57 of the top that is disposed at engine main body 33, and this chain wheel body 57 is connected with the air filter 58 (with reference to Fig. 1) of the top that is disposed at transmission case 22.

Note Fig. 2 as can be known, described transmission case 22 comprises: be connected setting integratedly with the left case halfbody 39 of described crankcase 21, and the box main body 61 that rearward extends; Be incorporated into the left side cover 62 of this box main body 61 from the left side; Advance the right side cover 63 at the rear portion of the described box main body 61 of archaism from the right side.

Described transmission device M comprises: with the infinite variable speed belt type continuously variable transmission 64 of the rotating power of crankshaft 34; Be clipped in the reduction gear row 66 that are provided with between the axletree 65 of described trailing wheel WR and the described belt type continuously variable transmission 64.Then, the speed changer chamber 67 that forms between 62 is covered in box main body 61 and left side that belt type continuously variable transmission 64 is contained in described transmission case 22, and the gear chamber 68 that forms between 63 is covered on box main body 61 and right side that described reduction gear row 66 are contained in described transmission case 22.

Described belt type continuously variable transmission 64 comprises: the drive pulley 70 that is arranged at the left part of described crankshaft 34 in described speed changer chamber 67; The follow-up pulley 71 of the rear portion configuration in described speed changer chamber 67; Be wound on the ring-type V belt 72 of drive pulley 70 and follow-up pulley 71.

Described drive pulley 70 possesses: the fixed side pulley halfbody 73 that is fixed in crankshaft 34; Can with respect to fixed side pulley halfbody 73 near away from movable sideslip wheel halfbody 74, the movable centrifugal weight 75 of wheel halfbody 74 that break away by moving to radial outside according to the increase of the rotating speed of crankshaft 34, near the direction of fixed side pulley halfbody 73 by ejection.

Rear portion at described transmission case 22, the output shaft 76 that has the axis parallel in described box main body 61 and right side cover 63 rotations supporting freely with described crankshaft 34, described follow-up pulley 71 possesses: can be supported in rotatably described output shaft 76 fixed side pulley halfbody 77 and can with respect to fixed side pulley halfbody 77 near away from movable sideslip wheel halfbody 78, the movable wheel halfbody 78 that breaks away by spring 79 towards fixed side pulley halfbody 77 by ejection.In addition, between fixed side pulley halfbody 77 and output shaft 76, be provided with output clutch 80.

Described output shaft 76 and jack shaft 81 and the axletree 65 parallel with this output shaft 76 are supported in 63 rotations of the rear portion of the described box main body 61 in described transmission case 22 and right side cover freely, described reduction gear row 66 are arranged between described output shaft 76, described jack shaft 81 and the described axletree 65, and the right-hand member of outstanding axletree 65 is provided with trailing wheel WR to the right connecting right side cover 63.

Then, the rotating power of crankshaft 34 is transmitted to drive pulley 70, via V belt 72, follow-up pulley 71, output clutch 80 and reduction gear row 66, is transmitted to trailing wheel WR from this drive pulley 70.

When the low speed rotation of motor E, the centrifugal force of centrifugal weight 75 that acts on drive pulley 70 is little, and therefore, because the spring 79 of follow-up pulley 71, the well width of fixed side pulley halfbody 77 and movable 78 of the wheel halfbodies of breakking away reduces, and gear ratio reduces.If increase the rotating speed of crankshaft 34 from this state, the centrifugal force that then acts on centrifugal weight 75 increases, the fixed side pulley halfbody 73 of drive pulley 70 and the movable well width of taking turns 74 of halfbodies that breaks away reduce, follow in this, the fixed side pulley halfbody 77 of follow-up pulley 71 and the movable well width of taking turns 78 of halfbodies that breaks away increase, therefore, gear ratio infinitely changes towards the highest from low.

Fore-and-aft direction intermediate portion at described transmission case 22, have the pedal axle 83 of the axis parallel in described box main body 61 and left side cover 62 rotations supporting freely, pedal starting pedal 84 in the outstanding end fastening foot from described left side cover 62 of this pedal axle 83 with described crankshaft 34.And, between described pedal axle 83 and box main body 61, be provided with backspring 85.

On the other hand, with the combined parts 86 that are provided with in the end of described crankshaft 34 with coaxial opposed bonded block 87 can center on and the rotation of the coaxial axis of described crankshaft 34 and the mobile mode of axial direction, be supported on the left side cover 62 of described transmission case 22, between described pedal axle 83 and described bonded block 87, be provided with overdrive gear row 88.Then, by the operation of trampling of kickpedal 84, utilize the rotation speedup of overdrive gear row 88 with pedal axle 83, it is transmitted to described bonded block 87, bonded block 87 advances and rotates to described combined parts 86 and combines, and thus, has transmitted to crankshaft 34 and to have employed rotating power.

In addition, the outer surface of the fixed side pulley halfbody 73 in described drive pulley 70 fixedly utilizes the rotation of fixed side pulley halfbody 73 tempering air to be imported a plurality of fins 89 in the speed changer chamber 67 ..., the front portion in the left side of described transmission case 22 cover 62 is installed by together rotate with described fixed side pulley halfbody 73 and will be used for the air leading-in conduit 90 of tempering air in the importing speed changer chamber, outside 67.In addition, the left surface of the cylinder block in engine main body 33 36 is installed and to be used for ventilation is imported pilot valve 91 in the described crankcase 21 with air.

Simultaneously with reference to Fig. 4 as can be known, at the right part of crankshaft 34 fixed rotor 93, the stator 94 that constitutes generator 95 with these rotor 93 interlocks is fixed in the right case halfbody 40 of crankcase 21 in the mode that is centered on by rotor 93.Side configuration radiator 96 at the crankcase 21 of the foreign side of generator 95, make cooling air by these radiator 96 ground with the cooling fan 97 of its attraction with described generator 95 is clipped in and the right case halfbody 40 of described crankcase 21 between mode, be installed on the right-hand member of described crankshaft 34.

And then, simultaneously as can be known with reference to Fig. 5, be provided with integratedly from the side around the tubular support case 40a of described generator 95 at described right case halfbody 40, the guard shield 98 that covers described cooling fan 97 from the side is arranged between described radiator 96 and the described support case 40a, and described radiator 96 is synthesized cover of raidator made of resin 99 and covers from foreign side.

Described radiator 96 is that upper tank 100 and lower tank 101 link via cooling center 102, and this radiator 96 is installed on the right case halfbody 40 of the crankcase 21 that engine main body 33 possesses.Promptly, be provided with corresponding to the single supporting wheel hub 103 of the rear portion configuration of described upper tank 100 with corresponding to the front portion of described lower tank 101 and a pair of supporting wheel hub 104 of rear portion configuration at described right case halfbody 40 ... upper tank 100 is anchored on described supporting wheel hub 103 by bolt 105, and lower tank 101 is by bolt 106 ... be anchored on described supporting wheel hub 104 ...

; at least a portion of radiator 96; be disposed at the below of described fulcrum 43 in this embodiment for the front portion of the upper tank 100 in the radiator 96; radiator 96 so that preceding front-end configuration in the mode in the place ahead of described fulcrum 43; be disposed at the side of crankcase 21; the posture that is installed on the radiator 96 under the state of described crankcase 21 as shown in Figure 3; axis L with respect to the cylinder thorax 35 in the cylinder block 36 of described engine main body 33; towards back upper place tilt angle alpha degree; the engine main body of having installed under the state of radiator 96 33 is supported under the state of vehicle body frame F via fulcrum 43, forms radiator 96 posture of forward leaning angle β degree with respect to the horizontal plane.Then, the front portion of upper tank 100 forms lower than the rear portion in the mode of hiding fulcrum 43, observe from the side situation under the front portion of upper tank 100 in the radiator 96 be disposed at the below of described fulcrum 43.

Simultaneously as can be known with reference to Fig. 6 and Fig. 7, described guard shield 98 has from the side integratedly around the 98a of tube portion of described cooling fan 97 so that peripheral portion is connected to that the mode of the internal surface of described guard shield 96 links the butt board 98b of an end that is arranged at the described tube 98a of portion and with except the part of the bottom of the top of upper tank 100 and lower tank 101 and approaching, the opposed mode in the both sides of described radiator 96 is given prominence to setting from described butt board 98b the 98c of pair of side plates portion ..., constitute by synthetic resin.Substantial middle portion at described butt board 98b, be the circular open portion 107 of the inner surface side central part that is coaxially arranged with the cooling center 102 in the described radiator 96 of the axis of crankshaft 34 with spin axis with described cooling fan 97, the bottom of the described tube 98a of portion be provided with towards below the exhaust port 108 opened.And, at the internal surface of the described butt board 98b of the part corresponding, be provided with from the axis of described opening portion 107 a plurality of guiding boss 109,109 every outstanding with radial extension at the circumferential overhead standard width of a room in an old-style house of described opening portion 107 with exhaust port 108 ...

This guard shield 98 is installed on described radiator 96, the front portion of the upper tank 100 in being arranged at described radiator 96 and the supporting portion at rear portion 110,111, utilize anchor clamps 114 ... the top of the tube portion 98a of installation from described guard shield 98 is the front end of the outstanding installation arm 112,113 that is provided with upward, and the fore-and-aft direction intermediate portion that the fore-and-aft direction middle lower portion supporting portion 115 of the lower tank 101 in being arranged at described radiator 96 utilizes anchor clamps 114 that the butt board 98b from described guard shield 98 is installed is given prominence to the front end of the installation arm 116 that is provided with downwards.

Described radiator box 99 is installed on described guard shield 98, utilizes threaded part 118 ... be anchored on the both sides board 98c in described guard shield 98 ... in front side side plate 98c upper and lower the empty standard width of a room in an old-style house every outstanding a pair of support protuberance 117,117 that is provided with in position and the outstanding support protuberance 117 that is provided with in top of the side plate 98c of side in the wings.

Be formed with the air introducing port 119 of square shape of the outer surface side of the cooling center 102 in the described radiator 96 at this radiator box 99, the window 120 that is disposed at this air introducing port 119 is arranged at radiator box 99.

Then, when the work of cooling fan 97, the air that imports from air introducing port 119 cools off this radiator 96 by the cooling center 102 of radiator 96, and then, discharge to the outside from the exhaust port 108 of guard shield 98.

, fixedly be equipped with in the part corresponding in a side that relies on the right case halfbody 40 of crankcase 21 than described exhaust port 108 and described cooling fan 97 and stop cooling air from cooling fan 97 to the logical current plate 122 of described crankcase 21 effluents with described exhaust port 108.This current plate 122 is anchored on the outstanding a pair of installation wheel hub 123,123 that is provided with in bottom of the butt board 98b in described guard shield 98 by threaded part 124,124, be installed on guard shield 98 thus, from the side under the situation of Guan Chaing, form circular-arc along the rotating locus of the radially outermost end of cooling fan 97.

And, at cooling fan 97 and crankcase 21 configuration generators 95, but dispose described current plate 122, the reflex part 122a that Zhou Duanxiang crankcase 21 sides are extended in this current plate 122 is provided with from it integratedly in the outer side of this generator 95.

Described radiator 96 formations can make the part at the cooling water circuit cooling unit of the water jacket 125 (with reference to Fig. 2) of the cylinder block 36 of engine main body 33 and cylinder head 37 settings, and this cooling unit possesses: water pump 126 from cooling waters to described water jacket 125 that supply with, be clipped in the described radiator 96 that assembles between the suction port 135 (with reference to Fig. 2) of described water jacket 125 and described water pump 126, make cooling water from described water jacket 125 return the state of described water pump 126 and the mode that makes cooling water return the state of water pump 126 from described water jacket 125 via radiator 96 is disposed at the thermostat 127 in the place ahead of described radiator 96 to switch circuitous described radiator 96 according to the temperature of cooling water.

The pump box 128 of described water pump 126 as shown in Figure 2, comprise: chimeric from right flank, as to be fixed in described cylinder head 37 box main body 129, the pump cover 130 that is anchored on this box main body 129, and the pump shaft 131 that rotate freely supporting rotating shaft line close by described box main body 129 liquid along the left and right directions of vehicle body frame F is with coaxial and can be linked to camshaft 50 with the relative rotation.And in the pump chamber 132 that forms in pump box 128, impeller 133 is fixed in described pump shaft 131.

Simultaneously with reference to Fig. 8, pump cover 130 fastening, the fixing thermostat tanks 134 that thermostat 127 are contained in inside at described pump box 128, this thermostat tank 134 from the axis of described pump shaft 131 along fore-and-aft direction (being the rear in this embodiment) away from, and, overlapping with described pump box 128 on fore-and-aft direction, the axis tilt of thermostat tank 134 is for along with become outside location towards the top.

The rear portion of the upper tank 100 in described radiator 96 is provided with the supply pipe 137 that extends upward integratedly, utilizes the feedwater cap 138 of rotary manipulation switching in the assembling of the upper end of this supply pipe 137.Have inlet duct 139 in the intermediate portion setting of the described supply pipe 137 at the rear of described fulcrum 43 at the upwardly extending axis in the front and back of described vehicle body frame F, this inlet duct 139 be positioned under the situation of observing from the side described fulcrum 43 above.On the other hand, cylinder head 37 in engine main body 33 is provided with the delivery line 140 of deriving cooling water from the top of described water jacket 125, this delivery line 140 is under the situation of observing from the side, be positioned at the below of described inlet duct 139, this delivery line 140 and described inlet duct 139 are via i.e. first conduit, 141 bindings of rubber pipe, this first conduit 141 becomes top position ground from delivery line 140 and extends towards inlet duct 139 sides, by pipe arrangement be pass through under the situation of observing from the side described fulcrum 43 above.

Between the anterior and described inlet duct 139 of described upper tank 100, planar stiffening plate 142 is set, at this stiffening plate 142 the circular open portion 143 that can insert logical fulcrum 43 is set, this opening portion 143 is under the situation of observing from the side under the state that engine main body 33 is supported on vehicle body frame F via described fulcrum 43, towards an end of fulcrum 43.

Intermediate portion at described delivery line 140 is provided with branch's connecting tube 144.On the other hand, with axis tilt for along with towards above become the top of thermostat tank 134 of outside location, towards inboard oblique upper give prominence to water jacket side connecting tube 145 be set, via linking described branch connecting tube 144 and described water jacket side connecting tubes 145 to thermostat 127 side directed second conduits 146 such as rubber hose from the cooling water of described water jacket 125.

In addition, the bottom of the lower tank 101 in radiator 96 is the outstanding outer pipe 147 that is provided with towards the place ahead, the outstanding heat sink side connecting tube 148 that is provided with below the skew back outward in the bottom of described thermostat tank 134.Then, described outer pipe 147 and described heat sink side connecting tube 148 link via the 3rd conduit 149 of the rubber hose that will guide from the cooling water of radiator 96.

In addition, guiding is connected with the spraying pipe 151 that is provided with at pump box 128 from an end of flexible pipe grade in an imperial examination four conduits 150 of the cooling water of water pump 126, and the other end of the 4th conduit 150 is connected with the ingress pipe 152 that mode with the bottom by water jacket 125 is arranged at cylinder block 36.

In addition, the exhaust usefulness conduit 153 that deflates of the top in the top of described pump box 128 connects the pump chamber 132 that is used in this pump box.

And then, be provided for connecting the connecting tube 154 of rubber hose at supply pipe 137, this connecting tube 154 be connected to atmosphere opening and with the storage (not shown) of radiator 96 general arrangement.Then, the cooling water in radiator 96 becomes high temperature and when expanding, described cooling water returns radiator 96 from described storage.By the circulation of the cooling water between such radiator 96 and storage, the air that are stranded in the supply pipe 137 are discharged to storage.That is, when the work of motor E, the also extraction of the air of self-cooling set well.

In such cooling unit, under the state of the warm-operation of the motor E that is through with, the cooling water of discharging from the water pump 126 that utilizes camshaft 50 to drive is supplied in water jacket 125 in the engine main body 33 through the 4th conduit 150, during by water jacket 125, behind the cooled engine E, be supplied in the upper tank 100 of radiator 96 through first conduit 141.Also have, with the cooling water that during the mode of lower tank 101 circulations is by radiator 96, reduces temperature through supercooling center 102 from upper tank 100 through the 3rd conduit 149 and thermostat 127, return the suction port 135 of described water pump 126.On the other hand, at motor E is in the warm-operation, when cooling water temperature hangs down, the circuitous radiator 96 of above cooling water and the circuit mode is moved thermostat 127, cooling water circulates and rapid ascending temperature in water jacket 125, second conduit 146, thermostat 127 and water pump 126 under the situation of the radiator 96 that does not pass through.

Note Fig. 3 and Fig. 5 as can be known, in the mode that covers feedwater cap 138 the position limit portion 99a of prevention to the rotation of the open position of feedwater cap 138 is set integratedly at radiator box 99.And, position limitation part 99a be provided with make the feedwater cap 138 a part to the outside towards shortcoming portion 155.

Secondly, the effect that this embodiment is described is as follows, at the side of crankcase 21 configuration radiator 96, attract the cooling fan 97 of cooling air to be installed on an end of crankshaft 34 by these radiator 96 ground, be disposed at the interior side of radiator 96, has exhaust port 108 in the bottom, and the guard shield 98 that covers cooling fan 97 from the side is arranged at described radiator 96, and between the support case 40a in the right case halfbody 40 of crankcase 21, but tissue fixedly is equipped on than described exhaust port 108 and described cooling fan 97 to the logical current plate 122 of crankcase 21 effluents in the part of exhaust port 108 from the cooling air of cooling fan 97 and relies on crankcase 21 side places.

Thereby, stop the fan 97 that is cooled to attract and cooling air by radiator 96 is logical to crankcase 21 effluents from what cooling fan 97 near the exhaust port 108 of guard shield 98 with current plate 122, cooling air to exhaust port 108 circulations, therefore, can improve the cooling effectiveness of radiator 96 swimmingly.

In addition, current plate 122 is installed on guard shield 98, and the guard shield 98 that current plate 122 can be installed is installed on crankcase 21, therefore, compare with the situation that crankcase 21 is installed on current plate 122, when cooling fan 97 is installed on crankshaft 34, current plate 122 can not become obstacle, can improve assembling performance.

And current plate 122 forms circular-arcly under the situation of observing from the side along the rotating locus of the radially outermost end of cooling fan 97, therefore, can more effectively stop from cooling off the circulation of fan 97 to the cooling air of crankcase 21 sides.

And then, configuration generator 95 between cooling fan 97 and crankcase 21, described current plate 122 in the outer side that is disposed at this generator 95 is provided with the reflex part 122a that extends from interior Zhou Duanxiang crankcase 21 sides of this current plate 122 integratedly, therefore, opposed by the periphery that makes reflex part 122a and generator 95, make a small amount of cooling air in generator 95 and 122 circulations of current plate that turbulent flow not take place, can make cooling air logical to exhaust port 108 effluents more swimmingly.

In addition, be arranged at the delivery line 140 of cylinder head 37 of described engine main body 33 and the inlet duct 139 of upper tank 100 that above the fulcrum 43 that can swingingly support the power unit P that comprises engine main body 33, is arranged at radiator 96 in the mode that derives cooling water from the topmost part of the water jacket 125 of engine main body 33 becoming the mode of top position towards inlet duct 139 sides from delivery line 140, via above the described fulcrum 43 under the situation of observing from the side and link.

Thereby the air in the water jacket 125 does not need the exhaust dedicated conduits through first conduit, 141 guiding radiators, 96 sides, in addition, the interference of first conduit 141 and fulcrum 43 can be avoided, the parts number of packages can be reduced, and, can oversimplify radiator 96 around catheter design.

And fulcrum 43 is disposed at the rear of the front end of radiator 96, therefore, can suppress the angle of inclination of first conduit 141, shortens the piping length of first conduit 141.

In addition, can make fulcrum 43 insert logical opening portions 143 in radiator 96 settings, this opening portion 143 is under the situation of observing from the side under the state that engine main body 33 is supported on vehicle body frame F via this fulcrum 43, end towards fulcrum 43, therefore, when vehicle body frame F assembling is installed on the engine main body 33 of crankcase 21 with radiator 96, do not bringing the position of obstacle not need to dispose radiator 96 to the logical operation of inserting of fulcrum 43, radiator 96 optimum position can be disposed at, the degrees of freedom of design can be improved.

In addition, inlet duct 139 has at the upwardly extending axis in the front and back of vehicle body frame F, and, under the situation of overlooking from the side, to be arranged at the upper tank 100 of radiator 96, therefore, forwards outstanding can be suppressed, radiator 96 integral body can be constituted compactly from the inlet duct 139 of radiator 96.

In addition, the place ahead of radiator 96 dispose have with axis tilt for along with towards above become the thermostat 127 of thermostat tank 134 of outside location, the water jacket side connecting tube 145 that is provided for connecting second conduit 146 that will guide from the cooling water of water jacket 125 is given prominence on top at this thermostat tank 134 towards inboard oblique upper, in the bottom of thermostat tank 134 toward the outer side oblique upper outstanding be provided for connecting will be from the heat sink side connecting tube 148 of the cooling water guiding of radiator 96, therefore, can be on the left and right directions of vehicle body frame F, little ground, the space compact arrangement thermostat 127 that thermostat 127 is shared, and, can do one's utmost to shorten second conduit 146 that is connected in water jacket side connecting tube 145 with guiding from the mode of the cooling water of water jacket 125, reach the length that is connected in the 3rd conduit 149 of heat sink side connecting tube 148 with guiding from the mode of the cooling water of radiator 96.

; in water pump 126; its pump shaft 131 is installed on the outer side surface of the cylinder head 37 in the engine main body 33 along the left and right directions of vehicle body frame F; but described thermostat tank 134 with from the axis of described pump shaft 131 along fore-and-aft direction away from; and; on fore-and-aft direction, be fixed in the pump box 128 of water pump 126 with the overlapping mode of pump box 128; therefore, can be as the design that the conduit 141,146,149,150 relevant with water pump 126 and thermostat 127 concentrated on the left and right directions of vehicle body frame F compactly.

More than, embodiments of the invention have been described, but the present invention is not limited to the foregoing description, carry out various design alterations under the situation of the present invention that can in the scope that does not break away from the patent request, put down in writing.

For example, in the above-described embodiments, the situation that is applicable to the small motor cycle type automatic double wheel vehicle has been described, but the present invention also goes for other dillies such as automatic tricycle.

Claims (4)

1. radiator for small-sized vehicle, it carries the engine main body (33) with water jacket (125) at vehicle body frame (F), side configuration radiator (96) at the crankcase (21) of a part that constitutes described engine main body (33), attract the cooling fan (97) of cooling air to be installed on an end of the crankshaft (34) that supports freely by described crankcase (21) rotation in mode by this radiator (96), and be disposed at the interior side of described radiator (96), the guard shield (98) that has exhaust port (108) and cover described cooling fan (97) from the side is arranged between described radiator (96) and described crankcase (21), it is characterized in that

Prevention fixedly is equipped on than described exhaust port (108) and described cooling fan (97) to the logical current plate (122) of described crankcase (21) effluent in the part corresponding with described exhaust port (108) from the cooling air of described cooling fan (97) and relies on crankcase (21) side place.

2. radiator for small-sized vehicle according to claim 1 is characterized in that,

Described current plate (122) is installed on described guard shield (98).

3. radiator for small-sized vehicle according to claim 1 and 2 is characterized in that,

Described current plate (122) forms circular-arc along the rotating locus of the radial direction outermost end of described cooling fan (97) under the situation of observing from the side.

4. according to each described radiator for small-sized vehicle in the claim 1～3, it is characterized in that,

Configuration generator (95) between described cooling fan (97) and described crankcase (21), the described current plate (122) in the outer side that is disposed at this generator (95) are provided with the reflex part (122a) that extends from interior Zhou Duanxiang crankcase (21) side of this current plate (122) integratedly.

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