CN1275674A - Radiation hole for casing and metal mould for formation of casing - Google Patents

Abstract

A heat release hole provided in an outer cover covering an object to be cooled is formed by providing a plurality of fins 84 on the outer cover, and each fin 84 is formed so that the mutual distance between the outer ends of these fins 84 is smaller than the mutual distance between the inner ends of each fin 84. Shapes with small intervals. In this way, the intrusion of foreign matter into the outer cover can be effectively prevented, and the cooling air can be smoothly introduced into the outer cover.

Description

Heat release hole of the cover and metal mold device for forming the cover

The present invention relates to a heat release hole provided in a cover covering an object to be cooled and a mold device for molding a synthetic resin cover having the heat release hole.

As a prior art, Japanese Utility Model No. 2573000 discloses a heat radiation hole provided in a cover covering a heat radiation portion of an engine mounted on a motorcycle.

The purpose of the heat release hole is to rectify the cooling air introduced into the outer cover, to suppress the leakage of noise generated in the outer cover to the outside, and to prevent the intrusion of foreign matter into the outer cover. As for the hole, a plurality of fins are provided in the housing, and the plurality of fins are arranged in the cooling air inlet and are inclined in a straight line along the flow direction of the air flow passage formed between the fins.

But, in order to effectively prevent foreign matters from invading into the outer cover, the mutual spacing of the outer ends of the fins is preferably smaller. The flow area of the air flow path becomes smaller along the entire length in the flow direction, and the flow resistance of the cooling air flowing through the air flow path increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat release hole of a cover that can effectively prevent foreign matter from entering the cover and smoothly introduce cooling air into the cover.

In order to achieve the above object, the heat release hole of the outer cover according to the first aspect of the present invention is formed by providing a plurality of fins on the outer cover. The outer cover covers the object to be cooled and has a cooling air outlet opening toward the object to be cooled. Inlet, the plurality of fins divide the cooling air inlet into a plurality of air flow passages. The central line of the entrance is arranged obliquely; the feature is that the above-mentioned fins are formed in such a shape that the mutual distance between the outer ends of these fins is smaller than the mutual distance between the inner ends of the fins.

According to such a configuration, by setting the distance between the outer ends of the respective fins relatively small, it is possible to effectively prevent foreign matter from entering the housing. Moreover, since the inner ends of the fins are spaced wider, the flow area of the air flow path between the fins is partially reduced on the outer end side of each fin, but it does not become smaller over the entire length of the air flow path. The flow resistance of the cooling air flowing through each air flow path can be avoided from greatly increasing, and the cooling air can be smoothly introduced into the housing while being rectified by each air flow path.

The heat radiation hole of the cover of the second aspect of the present invention is further characterized in that, in addition to the configuration of the first aspect, the above-mentioned fins integrally provided on the above-mentioned cover made of synthetic resin are composed of a fin main portion and a protruding portion. The main part of the fin extends obliquely with respect to the center line of the cooling air inlet, and connects the outer end flushly with the peripheral edge of the outer end of the cooling air inlet. Connected flush at an obtuse angle and protruding to the adjacent fin side. According to such a structure, the thickness of the outer end of each fin is partially increased to obtain the shape of the fin described in the first aspect, thereby avoiding an excessive increase in the weight of the fin, that is, the cover.

A third aspect of the present invention is a metal mold device for forming a cover having a heat release hole as described in the second claim, wherein the metal mold device for forming a cover has a first and a second metal mold device. The first metal mold has a first forming part for forming the outer surface and outer end surface of the main part of the fin and the outer surface and front end surface of the above-mentioned protruding part, and the second metal mold has an inner surface for forming the main part of the fin. The second forming part of the side surface and the inner end surface and the inner surface of the above-mentioned protruding part. According to this metal mold device, the parting surfaces of the first and second metal molds are set on the inner side of the outer end positions of the fins, thereby preventing burrs and sharp corners from occurring at the outer ends of the fins, and improving the durability of the cover. Appearance, improved merchandise. In addition, the inner surface of the protruding part is formed at the front end of the second forming part of the second metal mold, and the distance between the fins can be reduced while ensuring the width of the front ends of the first and second forming parts, so that the outer cover can also be improved. commodity.

A brief description of the accompanying drawings is as follows:

Fig. 1 is an overall side view of a scooter-type motorcycle.

FIG. 2 is an enlarged view of main parts of FIG. 1 .

Fig. 3 is a sectional view along line 3-3 of Fig. 2 .

Fig. 4 is a view along line 4-4 of Fig. 3 .

Fig. 5 is a sectional view of line 5-5 in Fig. 4 .

Figure 6 is a side view of the housing.

Fig. 7 is a sectional view of line 7-7 in Fig. 6 .

Fig. 8 is a cross-sectional view of line 8-8 in Fig. 6 .

Fig. 9 is a sectional view showing a part of the metal mold device.

The implementation form of the present invention will be described below according to an embodiment of the present invention shown in the drawings.

Fig. 1～Fig. 9 shows an embodiment of the present invention, and Fig. 1 is the overall side view of scooter type motor two-wheel vehicle, Fig. 2 is the enlarged view of main part of Fig. 1, Fig. 3 is 3-3 of Fig. 2 Line sectional view, Fig. 4 is a 4-4 line view of Fig. 3, Fig. 5 is a line sectional view of Fig. 4 and 5-5, Fig. 6 is a side view of the outer cover, and Fig. 7 is a 7-7 line sectional view of Fig. 6 , Figure 8 is a cross-sectional view of line 8-8 in Figure 6, and Figure 9 is a cross-sectional view showing a part of the metal mold device.

First, in FIGS. 1 and 2, a scooter V has a front wheel Wf steered by a steering handle 11 and a rear wheel Wr driven by a rocking power unit P. The frame F of the vehicle V is divided into three parts: a front frame 12 , a middle frame 13 , and a rear frame 14 . The front frame 12 is composed of an aluminum alloy casting of a front tube 12 ₁ , a down tube 12 ₂ and a pedal support portion 12 ₃ which are integrally provided. The power unit P is vertically swingably supported by a pivot shaft 15 on a middle frame 13 made of an aluminum alloy casting and joined to the rear end of the front frame 12 . The rear frame 14 extending to the rear and upper side of the power unit P is formed of an annular pipe and supports a fuel tank 16 thereon. A helmet box 17 is supported on the upper surface of the intermediate frame 13, and the helmet box 17 and the fuel tank 16 are covered by an outer cover 19 integrally provided with a seat 18 so as to be freely openable and closable.

The power unit P is an integral combination of a water-cooled single-cylinder four-stroke engine E with cylinders arranged toward the front of the vehicle body and a belt-type continuously variable transmission T extending from the left side of the engine E toward the rear of the vehicle body. The rear of the belt-type continuously variable transmission T passes through The rear bumper 20 is joined to the rear end of the intermediate frame 13 . An air cleaner 21 is supported above the belt-type continuously variable transmission T, a muffler 22 is supported on the right side of the belt-type continuously variable transmission T, and a main support 23 capable of standing up and down is supported under the engine E.

In FIGS. 3 and 4 , the engine E has a first engine block 32 and a second engine block 33 divided by a dividing plane extending vertically along the crankshaft 31, and the first engine block 32 constitutes a cylinder block ₃₂₁ and a crankcase. The half 32 ₂ , the second engine block 33 constitutes the other half of the crankcase. A cylinder head 34 is joined to the front end of the first engine block 32 , and a cylinder cover 35 is joined to the front end of the cylinder head 34 . A generator cover 36 is joined to the right side surfaces of the first and second engine blocks 32 and 33 .

The belt-type continuously variable transmission T has a right side case 37 and a left side case 38 joined to each other, and the front right side of the right side case 37 is joined to the left sides of the first and second engine blocks 32 and 33 . In addition, a speed reducer case 39 is joined to the rear right side of the right side case 37 .

A piston 42 slidably fitted inside a cylinder 41 included in the first engine block 32 is connected to the crankshaft 31 via a connecting rod 43 . A camshaft 44 is rotatably supported on the cylinder head 34 , and intake valves and exhaust valves (not shown) provided in the cylinder head 34 are driven to open and close by the camshaft 44 . A timing chain 45 is accommodated in a chain passage 40 provided in the first engine body 32 , and the timing chain 45 is wound around a driving sprocket 46 provided on the crankshaft 31 and a driven sprocket 47 provided on the camshaft 44 . Thus, when the crankshaft 31 rotates twice, the camshaft 44 rotates once.

A drive pulley 54 is provided at the left end of the crankshaft 31 protruding inside the right side case 37 and the left side case 38 . The drive pulley 54 has a fixed side pulley half body 55 fixed to the crankshaft 31 and a movable side pulley half body 56 that can approach and be away from the fixed side pulley half body 55. To the outside, the movable side pulley half 56 is given potential energy by the centrifugal counter weight 57 .

The output shaft 58 is supported between the rear part of the right side case 37 and the reducer case 39, and the driven pulley 59 provided on the output shaft 58 has a fixed side pulley half 60 that can rotate relative to the output shaft 58 and can be approached and separated from the fixed side. The movable side pulley half body 61 of the side pulley half body 60 is elastically biased toward the fixed side pulley half body 60 by a spring 62 from the movable side pulley half body 61 . In addition, a starting clutch 63 is provided between the fixed-side pulley half 60 and the output shaft 58 . An endless V-belt pulley 64 is wound between the drive pulley 54 and the driven pulley 59 .

An intermediate shaft 65 parallel to the output shaft 58 and an axle 66 are supported between the right side case 37 and the reduction case 39 , and a reduction gear train 67 is provided between the output shaft 58 , the intermediate shaft 65 , and the axle 66 . A rear wheel Wr is provided at the right end of the axle 66 protruding to the right side through the speed reducer 39 .

The rotational power of the crankshaft 31 is transmitted to the drive pulley 54 , and from the drive pulley 54 to the rear wheel Wr via the V-belt 64 , the driven pulley 59 , the starting clutch 63 and the reduction gear train 67 .

When the engine E rotates at a low speed, the centrifugal force acting on the centrifugal counterweight 57 of the driving pulley 54 is small, so the spring 62 of the driven pulley 59 reduces the groove width between the fixed side pulley half 60 and the movable side pulley half 61 , the gear ratio becomes LOW. When the rotational speed of the crankshaft 31 is increased from this state, the centrifugal force acting on the centrifugal counterweight 57 increases, and the groove width between the fixed side pulley half body 55 and the movable side pulley half body 56 of the drive pulley 54 decreases, and accordingly, The groove width between the fixed-side pulley half 60 and the movable-side pulley half 61 of the driven pulley 59 increases, so that the transmission ratio changes steplessly from LOW to TOP.

The alternator 68 provided on the right side of the crankshaft 31 is covered by the generator cover 36 , and a radiator 69 as an object to be cooled is provided on the right side of the generator cover 36 . In order to supply cooling air to the radiator 69 , a cooling fan 70 fixed to the right end of the crankshaft 31 is arranged between the alternator 68 and the radiator 69 . A thermostat box 72 housing a thermostat 71 is joined to the right side of the cylinder head 34 , and a cooling water pump 73 provided at the right end of the camshaft 44 is housed in a space surrounded by the cylinder head 34 and the thermostat box 72 .

As can be seen from FIG. 4 , the front lower part of the radiator 69 and the thermostat box 72 are connected by a cooling water pipe 74 , and the thermostat box 72 and the first engine block 32 are connected by a cooling water pipe 75 . Also, a water injection pipe 77 connected to the rear upper portion of the radiator 69 is detachably connected to the rear fender 76 covering the rear wheel Wr from above, and the water injection pipe 77 and the cylinder head 34 are connected by a cooling water pipe 78 .

When the warm-up operation of the engine E is completed, the cooling water discharged from the cooling water pump 73 driven by the camshaft 44 is supplied to the water in the first engine block 32 and the cylinder head 34 through the thermostat box 72 and the cooling water piping 75 . After cooling the engine E while passing there, it is supplied to the radiator 69 through the cooling water pipe 78 . The cooling water whose temperature has been lowered while passing through the radiator 69 is returned to the cooling water pump 73 through the cooling water piping 74 and the thermostat 71 . On the other hand, when the temperature of the cooling water is low during the warm-up operation of the engine E, the thermostat 71 operates, the cooling water circulates inside the engine E without passing through the radiator 69, and the temperature rises rapidly.

Referring to FIGS. 5 to 8 together, it can be seen that the cooling fan 70 fixed to the crankshaft 31 and the radiator 69 disposed outside the cooling fan 70 are covered with a synthetic resin cover 80 connected to the engine cover 36 . The outer cover 80 is arranged at the most prominent position on the right side of the scooter type motorcycle, and the inclination angle α toward the right side of the motorcycle is limited by the outer cover 80, so the lower side wall 80a of the outer cover 80 is formed to be inclined. The lower part 69a of the heat sink 69 is formed to be inclined so as to correspond to the above-mentioned lower side wall 80a.

The outer cover 80 is provided with a heat radiation hole 81 that guides cooling air from the outside to the radiator 69 to rectify the cooling air introduced into the outer cover 80, suppress the noise generated in the outer cover 80 from leaking to the outside, and prevent the intrusion of foreign matter into the outer cover 80. Inside the outer cover 80. The heat radiation hole 81 opens to the radiator 69 , and a plurality of fins 84 , 84 .

The cooling air inlet 82 is formed in an oblong shape along the front-rear direction of the motorcycle in order to form the above-mentioned inclination angle α. The position above the axis of the crankshaft 31 .

The fins 84 , 84 . . . are formed to extend long in the front-rear direction of the motorcycle, and are arranged at the cooling air inlet 82 at substantially equal intervals in the vertical direction. Furthermore, for each of the fins 84, 84..., the straight line L between the center of the outer end and the center of the inner end of the air flow passage 83 connecting these fins 84, 84... is inclined with respect to the center line C of the cooling air inlet 82. , in this embodiment, the center of the outer end of each air flow passage 83 is located below the center of the inner end, and the above-mentioned straight line L is inclined relative to the above-mentioned center line C.

Furthermore, the fin 84 is composed of a fin main portion 84a and an extended portion 84b, the fin main portion 84a extends obliquely with respect to the center line C of the cooling air inlet 82, and is flush with the periphery of the outer end of the cooling air inlet 82. Connecting the outer end, the protruding part 84b is provided flush with the outer end of the fin main part 84a at an obtuse angle and protrudes to the side of the adjacent fin 84 on the lower side, and each fin 84 has such a shape that The distance between the outer ends of the fins 84, 84... is narrower than the distance between the inner ends of the fins 84, 84....

In addition, the respective fins 84, 84... are connected to each other as a whole by a plurality of reinforcement parts 85, 85... extending in the vertical direction, but the outer end positions of these reinforcement parts 85, 85 are set so as to be aligned with the above-mentioned protruding part 84b. the same position on the inside.

The air introduced into the housing 80 through the heat release holes 81 is sucked by the cooling fan 70, passes through the radiator 69, cools the cooling water in the radiator 69, and is discharged to the outside from the air outlet 86 provided at the lower part of the housing 80.

However, as shown in FIG. 5 , the cooling fan 70 is fixed to the end portion of the crankshaft 31 , and the crankshaft 31 passes through a through hole 87 provided in the end wall 36 a of the generator cover 36 , and between the inner surface of the through hole 87 and the outer surface of the crankshaft 31 . An annular gap is created through the inside of the housing 80 . For this reason, when the cooling fan 70 works, if a negative pressure is generated in the gap 88 between the cooling fan 70 and the end wall 36a, then a negative pressure is also generated in the generator cover 36, which may be from the generator cover 36 and the first, second 2 Dust and water intrude into the joint surfaces of the engine blocks 32 and 33. Therefore, the cooling fan 70 is formed facing the end wall 36a of the generator cover 36 over a long distance, and generation of negative pressure in the gap 88 between the cooling fan 70 and the end wall 36a is prevented as much as possible.

In FIG. 9, the metal mold device for forming the cover 80 has first and second metal molds 91 and 92 that can approach and separate from each other, and the first metal mold 91 is provided with fins for forming the fins 84. The first forming part 91a of the outer surface and outer end surface of the sheet main part 84a and the outer surface and front end surface of the protruding part 84b is provided with the inner surface, the inner end surface and the protruding part for forming the fin main part 84a in the second die 92. 84b inner surface of the second forming part 92a.

The action of this embodiment will be described below. The plurality of fins 84 , 84 . Therefore, by setting the distance between the outer ends of the respective fins 84 , 84 . In addition, since the inner ends of the fins 84, 84... are relatively wide, the flow area of the air flow passages 83, 83... between the fins 84, 84... is part of the outer end side of the fins 84, 84... become smaller, but the overall length of the air flow passages 83, 83... can be avoided to greatly increase the circulation resistance of the cooling air flowing through the air flow passages 83, 83..., and the air flow passages 83, 83 ...rectifies the cooling air and smoothly introduces it into the housing 80 to effectively cool the radiator 69 .

The fin 84 is composed of a fin main portion 84a and a protruding portion 84b. The fin main portion 84a extends obliquely with respect to the center line C of the cooling air inlet 82, and is flushly connected to the outer peripheral edge of the cooling air inlet 82. end, the protruding portion 84b is connected at an obtuse angle at the outer end of the fin main portion 84a and extends to the adjacent fin 84 side, the thickness of the outer end side of the fin 84 is locally thickened, and the fin 84 , 84 . . . The distance between the outer ends is smaller than the distance between the inner ends of the fins 84, 84 . . . Therefore, the fins 84, 84 .

Each fin 84 is obliquely formed on the outer cover 80 arranged at the lower part of the motorcycle, and is located at a lower position as it goes outward, so that the line of sight of a person located on the right side of the motorcycle can be reliably prevented from entering the outer cover 80. Inside, improve the commodity.

The metal mold device for forming the cover 80 has first and second metal molds 91, 92. The first metal mold 91 has an outer surface and an outer end surface for forming the fin main part 84a and the outer surface and the outer surface of the protruding part 84b. The first forming part 91a of the front end surface, the second metal mold 92 has the second forming part 92a for forming the inner surface and the inner end surface of the fin main part 84a and the inner surface of the protruding part 84b, the first and the second metal molds 91, The parting surface 92 is set on the inner side of the outer end of the fin 84 to prevent burrs and sharp corners at the outer end of the fin 84, improve the appearance of the cover 80, and improve the marketability.

The projecting portion 84b is formed at the front end of the second forming portion 92a included in the second metal mold 92, so that the front end width W2 of the second forming portion 92a and the front end width W1 of the first forming portion 91a can be ensured, and the fins 84 can be separated from each other. The space between the housings is narrowed, thereby improving the commerciality of the cover 80 .

The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the invention described in the claims.

For example, in the above-mentioned embodiment, the case where the present invention is applied to the cover 80 covering the radiator 69 has been described, but the present invention can also be widely applied to heat radiation holes provided in the cover covering the object to be cooled.

As mentioned above, according to the first solution of the present invention, foreign matter can be effectively prevented from intruding into the outer cover, and the circulation resistance of the cooling air flowing through each air flow path can be avoided from greatly increasing, and the cooling effect can be improved by each air flow path. While straightening the air, it is smoothly introduced into the housing.

According to the second aspect of the present invention, the thickness of the outer end side of the fin is partially thickened to obtain the shape of the fin as described in the first invention, thereby avoiding too much increase in the weight of the fin, that is, the outer cover.

According to the third aspect of the present invention, the parting surfaces of the first and second metal molds are set on the inner side of the outer end of the fins, which can prevent burrs and sharp corners at the outer ends of the fins and improve the appearance of the outer cover. To improve the product quality, the inner surface of the protruding part is formed at the front end of the second forming part of the second metal mold, and the mutual interval between the fins can be reduced while ensuring the width of the front ends of the first and second forming parts, thereby also The merchandiseability of the cover can be improved.

Claims (3)

1. A heat release hole of an outer cover, the heat release hole is formed by arranging a plurality of fins (84) on the outer cover (80), the outer cover (80) covers the above-mentioned object to be cooled (69) and has a direction toward the object to be cooled (69) Open cooling air inlet (82), the plurality of fins (84) divides the cooling air inlet (82) into a plurality of air flow passages (83), when a plurality of fins (84) are provided The straight line (L) connecting the center of the outer end and the center of the inner end of each air flow passage (83) is arranged to be inclined relative to the center line (C) of the cooling air inlet (82); it is characterized in that: the above-mentioned fins The sheet (84) is formed in such a shape that the distance between the outer ends of the fins (84) is smaller than the distance between the inner ends of the fins (84). 2. The cover heat release hole according to claim 1, characterized in that the fins (84) integrally provided on the above-mentioned cover (80) made of synthetic resin are composed of a fin main part (84a) and a protruding part (84b). ) configuration, the fin main portion (84a) extends obliquely with respect to the center line (C) of the cooling air inlet (82), and connects to the outer edge of the cooling air inlet (82) in a flush manner. The protruding part (84b) is arranged flushly at the outer end of the fin main part (84a) at an obtuse angle and protrudes to the adjacent fin (84) side. 3. A metal mold device for molding, which is used for molding the cover having heat radiation holes according to claim 2, characterized in that the metal mold device for forming the cover has a first metal mold (91) and a second metal mold (92), the first metal mold (91) has a first forming part (91a) for forming the outer surface and outer end surface of the above-mentioned fin main part (84a) and the outer surface and front end surface of the above-mentioned protruding part (84b) ), the second metal mold (92) has a second forming part (92a) for forming the inner surface and inner end surface of the above-mentioned fin main part (84a) and the inner surface of the above-mentioned protruding part (84b).

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