JP2003170792A - Radiator mounting structure of small-sized vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiator mounting structure of a small-sized vehicle capable of reducing the number of part items and man-hour for assembly for cost reduction by integrally forming a radiator base and a radiator grille using one type of mold and resin material, thus eliminating use of tightening parts. <P>SOLUTION: The radiator base 81 which is mounted on an internal combustion engine and locates a radiator 70 and the radiator grille 82 for protecting the front of the radiator 70 are integrally formed using the same resin material through a flexible joint part 83. The radiator grille 82 is folded against the radiator base 81 by the deformation to the joint part 83 to sandwich the radiator 70 between them. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator mounting structure for a small vehicle.

[0002]

2. Description of the Related Art A radiator is supported by a radiator base and a front surface thereof is covered with a radiator grill to protect the radiator.

In a small vehicle such as a motorcycle, for example, as disclosed in Japanese Patent Laid-Open No. 2000-344168,
Conventionally, a radiator grill has been mounted by fastening a flange portion formed on the periphery thereof to a radiator base with fastening components such as bolts.

[0004]

SUMMARY OF THE INVENTION As described above, conventionally,
The radiator base and radiator grill are separate pieces and require separate molds. It also requires fasteners to attach the radiator grill to the radiator base,
Since the number of parts is large and the mounting work is troublesome, the cost is high.

The present invention has been made in view of the above points,
The purpose is to make a radiator base and a radiator grill integrally molded from a resin material with one type of molding die, no fastening parts are required, the number of parts and the assembly man-hour can be reduced, and the cost can be reduced. The point is to provide the radiator mounting structure.

[0006]

In order to achieve the above object, the present invention according to claim 1 is directed to a radiator base mounted on an internal combustion engine for positioning a radiator and a radiator grill for protecting the front surface of the radiator. Of a small vehicle that is integrally molded of the same resin material through a flexible connecting portion, and folds the radiator grill with respect to the radiator base due to the deformation of the connecting portion, and sandwiches the radiator between the two. It has a radiator mounting structure.

Since the radiator base and the radiator grill are integrally molded from the same resin material via the flexible connecting portion, it is possible to mold with one kind of molding die and to reduce the cost.

Since the radiator grill is folded with respect to the radiator base due to the deformation of the connecting portion and the radiator is sandwiched between the two, fastening parts such as bolts are not required, and the number of parts and the number of assembly steps can be reduced and the cost can be reduced. Can

According to a second aspect of the present invention, in the radiator mounting structure for a small vehicle according to the first aspect, the two radiator tanks of the radiator are formed in a cylindrical shape,
It is characterized in that one radiator tank is oriented in the horizontal direction and is arranged in parallel in the vertical direction and is connected by a water tube, and the radiator is held from the vertical direction.

Since the two radiator tanks are oriented in the horizontal direction and are arranged in parallel in the vertical direction and are connected by the water tube to hold the radiator in the posture from the vertical direction, the radiator is effectively supported against vertical vibration. be able to. Since the two radiator tanks are formed in a cylindrical shape, the holding structure can be simplified.

According to a third aspect of the present invention, in the radiator mounting structure for a small vehicle according to the second aspect, the upper and lower radiator tanks are held by a holding portion formed on the radiator base.

Since the upper and lower radiator tanks are held by the holding portion formed on the radiator base, the load on the connecting portion is reduced and the durability is improved without applying a load to the radiator grill.

According to a fourth aspect of the invention, in the radiator mounting structure for a small vehicle according to the third aspect, the holding portion formed on the radiator base holds the radiator tank detachably by elastic deformation. Characterize.

Since the holding portion formed on the radiator base holds the radiator tank detachably by elastic deformation, the radiator tank can be held easily without the need for fastening parts, and the assembling work becomes extremely simple. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. The water-cooled internal combustion engine 21 according to the present embodiment is a scooter type motorcycle 1
Is installed as a swing unit type engine.

As shown in FIG. 1, a scooter type motorcycle 1
Includes a front wheel 3 steered by the steering wheel 2 and a rear wheel 5 pivotally supported by a swing-type power unit 4 and driven by a vehicle body frame from a head pipe 6 pivotally supporting the steering wheel 2. Down tube 7 extending downward
Bends and extends rearward to form a step floor support portion 7a, a center frame 8 connected to a rear end thereof rises and extends obliquely rearward, and a rear frame 9 connected to an upper end thereof further extends rearward. .

The head pipe 6, the down tube 7 and the center frame 8 are cast products of aluminum alloy, and the rear frame 9 is made of an annular pipe material. A fuel tank 10 is supported by the rear frame 9, and a seat 12 that also serves as a cover that closes the upper opening of the helmet case 11 supported by the center frame 8 covers the fuel tank 10 together with the helmet case 11 in an openable and closable manner.

The power unit 4 is pivotally supported on the bent portion of the center frame 8 via the pivot 15.
Is provided so as to be able to swing up and down together with a rear wheel 5 pivotally supported at a rear end of the pivot 15, and a rear cushion is provided between a rear portion of the power unit 4 and a rear end of the center frame 8.
16 are installed.

As shown in FIG. 2, the power unit 4 includes an internal combustion engine 21 in which cylinders are arranged toward the front of the vehicle body, and a belt type continuously variable transmission 22 extending from the left side portion of the internal combustion engine 21 toward the rear of the vehicle body. The rear wheel is supported by an output shaft 23 that is integrally formed and projects in the right horizontal direction from the rear end of the belt type continuously variable transmission 22.

The internal combustion engine 21 is a water-cooled, single-cylinder, four-stroke cycle engine as shown in FIG. 3, and is divided into front and rear parts to form an engine block 25 (front engine block 25f, rear engine block). The crankshaft 24 is sandwiched by the bearings 25r) via bearings, and the front engine block 25f forms a cylinder block integrally with the half of the crankcase.

A cylinder head 26 is overlapped and fastened to the front end of the cylinder block of the front engine block 25f, and a head cover 27 covers the front end of the cylinder head 26.

The intake pipe 17 extends from the upper surface of the cylinder head 26 projecting forward and bends rearward to make the engine block 25
Is connected to the carburetor 18 located above (see FIG. 2), and the carburetor 18 is connected to an air cleaner (not shown).

An exhaust pipe (not shown) extends from the lower surface of the cylinder head 26, bends obliquely rearward and rightward, and passes under the engine block 25 and is connected to a muffler 19 disposed on the right side of the rear wheel 5. (See FIG. 1).

Referring to FIG. 3, a piston 30 slidably fitted in the cylinder of the cylinder block is connected by a crankshaft 24 rotatably supported by the engine block 25 and a connecting rod 31 to form a crankshaft 24. A drive pulley (not shown) of the belt type continuously variable transmission 22 is provided at the left end of the power transmission unit to transmit power.

A cam shaft 32 is rotatably supported on the cylinder head 26, and a driven sprocket 33 fastened to its end is provided in a chain chamber 26a formed on the right side of the cylinder head 26. 33 and crankshaft
The timing chain 35 is bridged between the drive sprocket 34 fitted to the shaft 24 and the rotation of the crankshaft 24 is transmitted to the camshaft 32 with the rotation speed being halved.

An AC generator is located on the right side of the engine block 25.
36 is provided, and a generator case 25a extending from the engine block 25 covers the outer periphery of the AC generator 36. A cooling fan 37 is attached to the right side surface of the rotor of the AC generator 36 fitted to the right end of the crankshaft 24.

A radiator 70 is arranged on the right side so as to protect the cooling fan 37. A radiator base 81 surrounding and supporting the rectangular radiator 70 is connected and supported by the generator case 25a and covers the cooling fan 37. The radiator grill 82 covers the right side opening of the radiator base 81 that surrounds the radiator 70.
Is designed to open and close freely.

Radiator base 81 and radiator grill 82
Is a single resin case 80 integrally molded of the same resin material via a flexible connecting portion 83 as described later.
And the radiator grille against the radiator base 81
When the connecting portion 83 is deformed, the connecting portion 83 is swung to open and close.

A chain chamber 26a on the right side of the cylinder head 26
An opening coaxial with the cam shaft 32 is formed in the center on the right side wall of the, and the water pump 50 is mounted by inserting the pump body case 51 into the opening, and the expansion tank 40 is directly attached to the water pump 50. Has been.

A pump body case 51 of the water pump 50
Is composed of a bottomed cylindrical portion 51a for accommodating the driven magnet 54 supported by the rotating shaft 53 and an opening large diameter portion 51b for accommodating the impeller 55 fitted on the rotating shaft 53, and covers the opening large diameter portion 51b. A pump cover case 52 rotatably supports one end of a rotary shaft 53 and rotatably supports a driven magnet 54 and an impeller 55.

Referring to FIG. 3, around the pump body case 51 fitted in the chain chamber 26a of the cylinder block 26, a cylindrical support member 38 is fastened together with the driven sprocket 33 on the end surface of the camshaft 32. The drive magnet 39 fitted to the inner peripheral surface is arranged, and the driven magnet 54 of the water pump 50 rotates together with the drive magnet 39 that rotates together with the camshaft 32 to rotate the impeller 55.

The thermostat chamber is formed in the pump cover case 52, and the thermostat 65 is fitted and covered with the thermostat cover 64. The thermostat chamber communicates with the suction connection pipe 59 and the thermostat cover 64.
To the connection communication passage 64a.

As shown in FIG. 2, the suction connection pipe 59 is connected to the cooling water outlet of the lower tank 72 of the radiator 70 by the cooling water hose 66, and the connection communication passage 64a is connected to the cooling water passage of the carburetor 18 by the cooling water hose 67. To be done. cylinder head
The cooling water flowing out from 26 is branched and one flows to the upper tank 71 of the radiator 70 by a cooling water hose (not shown) and the other flows to a carburetor by a cooling water hose (not shown).

The cooling water discharge port of the water pump is connected to the cooling water introduction port of the engine block 25 by a cooling water hose 68. Further, the expansion tank 40 has a cooling water hose extending from one cooling water outlet of the cylinder head 26.
A part of the cooling water flows in by 71, and the cooling water from which gas and liquid have been separated to remove the gas is returned to the water pump 50.

A cooling fan 37 is provided on the right side of the AC generator 36.
The radiator 70 disposed so as to protect the radiator 70 and the resin cover 80 that sandwiches the radiator 70 will be described.

As shown in FIG. 4, in the radiator 70, an upper tank 71 and a lower tank 72 are vertically aligned in parallel with each other in a horizontal direction, and a plurality of flat tubular water tubes 73 are provided between the two tanks 71, 72. Side members 74 are connected and arranged on both sides, and fins 75 bent in a corrugated shape are interposed between the adjacent water tubes 73, 73.

As shown in the exploded perspective view of the radiator 70 in FIG. 5, the upper tank 71 comprises a cylindrical pipe tank 71a, a closing plate 71b for closing one end opening thereof, and a joint 71c connected to the other end opening.

The lower tank 72 is also a cylindrical pipe tank 72a, a closing plate 72b for closing one end opening thereof, a drain bolt 72c, and a joint 72 connected to the other end opening.
It consists of d and.

The cylindrical pipe tanks 71a and 72a are shown in FIG.
It is manufactured by the process shown in. Ie rectangular flat plate 76
Is press-formed (FIG. 6), a plurality of elongated holes 76c into which the water tube 73 and the side member 74 are fitted are punched at predetermined locations (FIG. 6), and then cylindrical bending is performed (FIG. 6). Finally, the joining sides 76a and 76b are joined (FIG. 6) to manufacture the cylindrical pipe tanks 71a and 72a.

As described above, the pipe tanks 71a and 72a can be easily manufactured. In addition, a groove into which the water tube 73 and the side member 74 are fitted may be formed in advance in a pipe shape.

As for other parts such as the closing plates 71b and 72b and the joints 71c and 72d, since the pipe tanks 71a and 72a have a cylindrical shape, general-purpose products or semi-general-purpose products can be used. As described above, the radiator 70 can be manufactured at low cost.

As shown in FIGS. 7 to 10, the resin cover 80 is an integrally molded product made of the same resin material in which a radiator base 81 and a radiator grill 82 are connected via a connecting portion 83.

The radiator base 81 is an engine block.
25 has a shape in which a flat cylindrical fan cover portion 81a connected to the generator case 25a and a rectangular frame portion 81b surrounding the radiator 70 are integrally formed, and a semi-cylindrical shape is formed on the upper and lower sides of the rectangular frame portion 81b. Portions 81c and 81d are formed.

At the end edge of the semi-cylindrical portion 81c on the upper side, engaging pieces 81 projecting as if the semi-cylindrical portion 81c extended in an arc shape at two locations.
e and 81e are formed, and the locking claws 81f and 81f project outward (upward), and the semi-cylindrical portion 81d projects to the center at the end edge of the lower semi-cylindrical portion 81d. An engagement piece 81g is formed. Mounting holes 81h are provided at four corners of the fan cover 81a such as a flange.

On the other hand, the radiator grill 82 has a rectangular shape, has a large grid-like grid portion 82a in the center, and has semi-cylindrical portions 82b and 82c formed on the upper and lower sides in a state of swinging downward to open the lower side. The semi-cylindrical part 82c is formed with notches at two locations to form arcuate locking pieces 82d, 82d,
The tips of the locking pieces 82d, 82d are warped, and the locking holes 82e, 82 into which the locking claws 81f, 81f are fitted at the roots thereof.
e is drilled.

The connecting portion 83 has flexibility, and the radiator grille 82 can be folded with respect to the radiator base 81 by deformation of the connecting portion 83. Resin case 80 as above
Is mounted so that the radiator base 81 is bolted to the generator case 25a of the engine block 25 using the mounting holes 81h at the four corners, and the radiator grill 82 swings downward to open (see FIG. 2).

The radiator grille 82 of the resin case 80 attached in this way is rocked downward to open, and the radiator 70 is fitted into the rectangular frame portion 81b of the radiator base 81. At this time, the upper tank 71 and the lower tank 72 of the radiator 70 are fitted to the upper and lower semi-cylindrical parts 81c and 81d of the radiator base 81, respectively, and elastically deformed to be engaged and held by the engaging pieces 81e and 81e and the engaging piece 81g. To do.

Therefore, the radiator 70 has an upper semi-cylindrical portion.
82b, engaging pieces 81e, 81e and lower semi-cylindrical portion 82c engaging piece 81
Since it is held in the vertical direction by g, the radiator 70 can be effectively held against vertical vibration.

Then, the radiator grille 82 is swung upward so that the radiator 70 is sandwiched between the radiator base 81 and the radiator base 81, and the locking piece 82 on the radiator grille 82 side is folded.
The locking claws 81f, 81f on the radiator base 81 side are fitted and locked in the locking holes 82e, 82e of the d, 82d, and the radiator grille 82 is closed.

In this way, the radiator 70 is sandwiched between the radiator base 81 and the radiator grill 82 of the resin case 80. As described above, the radiator 70 is held in the vertical direction and firmly supported against vertical vibration,
The rectangular frame portion 81b of the radiator base 81 and the side walls 82f, 82f of the radiator grille 82 position the side member 74 of the radiator 70 in the front-rear direction and are firmly supported even in the front-rear movement.

Since the radiator 70 is held from above and below by the upper semi-cylindrical portion 82b formed on the radiator base 81, the engaging pieces 81e, 81e and the lower semi-cylindrical portion 82c, and the engaging piece 81g, the radiator grille is held. Since no load is applied to 82, the load on the connecting portion 83 is reduced and the durability can be improved.

The radiator grille 82 has locking holes 82e, 82e and locking claws 81f, without using any fastening parts such as bolts.
Since the radiator 70 can be closed by the locking of the 81f, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced.

Radiator base 81 and radiator grill 82
Since and are integrally molded of the same resin material via the flexible connecting portion 83, they can be molded with one kind of molding die, and the cost can be further reduced.

Since the radiator tank of this radiator has a cylindrical shape, one end of the upper tank 91 and the lower tank 92, which have a cylindrical shape like the radiator 90 shown in FIGS. 11 and 12, is flatly pressed and closed. At the same time, it is possible to easily provide the flat ends 91a and 92a with the mounting holes 91b and 92b so as to have a function as a mounting stay.

Further, in the radiator 100 shown in FIG. 13, since the upper tank 101 and the lower tank 102 have a cylindrical shape, the water temperature sensor 103 having a cylindrical shape can be easily attached to the end opening of the upper tank 101.

Furthermore, in the radiator 110 shown in FIG. 14, the thermo case 113 can be easily attached to the circular opening at the end of the upper tank 111 of the cylindrical upper tank 111 and lower tank 112.

Further, in the example shown in FIG. 15, the lower tank 142 is directly fitted and connected to the water pump 135 provided in the internal combustion engine 130 by utilizing the cylindrical shape of the upper tank 141 and the lower tank 142 of the radiator 140. To do.

The upper tank 141 has one end opening closed and a connection pipe 141a protruding from the other end, and the lower tank 142 has one end opening closed and the other end open, and a groove is formed in the outer periphery in the vicinity of the opening. 142a is formed.

The internal combustion engine 130 constitutes a power unit, and a cylinder head 132 is projected forward from the engine block 131, and a water pump is provided below the crankcase.
The pump cover 135a has a cylindrical connection port 13
5b is formed rearward.

Resin case 150 for supporting the radiator 140
Is the same as the resin case 80 of the above-mentioned embodiment, the radiator base 151 and the radiator grill 152 are integrally molded from the same resin material via the flexible connecting portion 153. 151 is an upper semi-cylindrical portion 151b, engaging pieces 151e and 151e, and a lower semi-cylindrical portion 151.
c, has an engaging piece 151g.

In order to hold the radiator 140 on the radiator base 126, a groove 142a near the opening of the lower tank 142 is used.
The lower tank 142 is fitted to the lower semi-cylindrical portion 151c and the engaging piece 151g, and the opening end is slid forward to fit into the connection port 135b of the pump cover 135a from the rear. .

Then, the radiator 150 is swung around the cylindrical lower tank 142 as an axis to move the upper tank 141 into the upper semi-cylindrical portion 151b of the radiator base 151 and the engaging pieces 151e and 151e.
The engaging pieces 151e and 151e are elastically deformed and fitted. A cooling water hose 136 extending from the cylinder head 132 is connected to the connection pipe 141a of the upper tank 141.

Of the cylindrical upper tank 141 and the lower tank 142 of the radiator 140 as described above, the lower tank 14
2 can be directly fitted and connected to the water pump 135 provided in the internal combustion engine 130, reducing the cooling water hose,
It is possible to further reduce the cost by facilitating the assembling work by reducing the number of parts.

[Brief description of drawings]

FIG. 1 is an overall side view of a scooter type motorcycle including a radiator mounting structure according to an embodiment of the present invention.

FIG. 2 is a side view of a power unit including the radiator mounting structure.

FIG. 3 is a sectional view of an internal combustion engine provided with the radiator mounting structure.

FIG. 4 is an overall perspective view of a radiator.

FIG. 5 is an exploded perspective view of the radiator.

FIG. 6 is an explanatory view showing one manufacturing process of the radiator tank.

FIG. 7 is a front view of the resin case with the radiator grill opened.

FIG. 8 is a rear view of the same.

FIG. 9 is a view on arrow IX in FIG.

10 is a cross-sectional view taken along line XX in FIG.

FIG. 11 is another modification of the radiator.

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is another modification of the radiator.

FIG. 14 is still another modification of the radiator.

FIG. 15 is a partial side view of a power unit according to another embodiment.

[Explanation of symbols]

1 ... Scooter type motorcycle, 2 ... Steering handle, 3 ... Front wheel, 4 ... Power unit, 5 ... Rear wheel, 6 ... Head pipe, 7 ... Down tube, 8 ... Center frame, 9 ... Rear frame, 10 ... Fuel tank , 11 ... helmet case,
12 ... Seat, 15 ... Pivot, 16 ... Rear cushion, 17 ...
Intake pipe, 18 ... Carburetor, 19 ... Muffler, 21 ... Internal combustion engine, 22 ... Belt type continuously variable transmission, 23 ... Output shaft, 24 ... Crankshaft, 25 ... Engine block, 26 ... Cylinder head, 27
... head cover, 30 ... piston, 31 ... connecting rod, 32 ... cam shaft, 33 ... driven sprocket, 34 ... drive sprocket, 35 ... timing chain, 36 ... AC generator, 37 ... cooling fan, 38 ... cylindrical support member, 39 … Drive magnet, 40… Expansion tank, 41… Cooling water hose, 50… Water pump, 51… Pump body case, 52
... Pump cover case, 53 ... Rotating shaft, 54 ... Follower magnet, 55 ... Impeller, 56 ... Scroll chamber, 57 ... Thermostat chamber, 58 ... Suction passage, 59 ... Suction connection pipe, 60, 61 ... Suction passage, 62 ... Discharge Connection pipe, 63 ... Bolt hole, 64 ... Thermostat cover, 65 ... Thermostat, 66, 67, 68 ... Cooling water hose, 70 ... Radiator, 71 ... Upper tank, 72 ... Lower tank, 73 ... Water tube, 74 ... Side member, 75
… Fins, 76… Flat plate, 80… Resin case, 81… Radiator base, 82… Radiator grille, 83… Connection part, 90… Radiator, 91… Upper tank, 92… Lower tank, 100… Radiator, 101… Upper tank, 102… Lower tank , 103
… Water temperature sensor, 110… Radiator, 111… Upper tank,
112 ... Lower tank, 113 ... Thermo case, 130 ... Internal combustion engine, 131 ... Engine block, 132 ... Cylinder head, 13
5 ... Water pump, 136 ... Cooling water hose, 140 ... Radiator, 141 ... Upper tank, 142 ... Lower tank, 145 ... O
Ring, 150 ... Resin case, 151 ... Radiator base, 15
2 ... Radiator grill, 153 ... Connection part.

Claims (4)

[Claims] 1. A radiator base attached to an internal combustion engine for positioning a radiator and a radiator grill for protecting a front surface of the radiator are integrally formed of the same resin material via a flexible connecting portion, and the radiator base is formed. On the other hand, a radiator mounting structure for a small vehicle, characterized in that the radiator grille is folded by the deformation of the connecting portion and the radiator is sandwiched between the two. 2. The two radiator tanks of the radiator are formed in a cylindrical shape, the two radiator tanks are oriented in the horizontal direction and are arranged vertically in parallel, and are connected by a water tube, and the radiators are arranged in the vertical direction. The radiator mounting structure according to claim 1, wherein the radiator mounting structure is held. 3. The radiator mounting structure for a small vehicle according to claim 2, wherein the upper and lower radiator tanks are held by a holding portion formed on the radiator base. 4. The radiator mounting structure for a small vehicle according to claim 3, wherein the holding portion formed on the radiator base holds the radiator tank detachably by elastic deformation.