JP7191871B2 - blower - Google Patents

Description

The present invention relates to blowers.

Conventionally, it has a rotating drive shaft, a fan that rotates together with the drive shaft, and a fan cover that covers the fan from the outside in the axial direction of the drive shaft. A blower that blows air outward is known (see Patent Document 1, for example).

Japanese Unexamined Patent Application Publication No. 2014-5770

By the way, in the above-mentioned conventional air blower, the pressure of the airflow increases on the outer peripheral side of the fan due to the blowing of the fan, and the airflow may flow backward to the suction side. Therefore, it is desirable to reduce the backflow of the airflow.
SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and an object of the present invention is to reduce backflow of air in a blower.

The blower includes a rotating drive shaft (22), a fan (51) rotating integrally with the drive shaft (22), and a fan covering the fan (51) from the outside in the axial direction of the drive shaft (22). and a cover (52) for blowing air sucked through the fan cover (52) by rotation of the fan (51) to the outside in the radial direction of the fan (51), wherein the fan cover (52): a tubular portion (71) extending in the axial direction outside of the drive shaft (22) with respect to the fan (51); and opening side ribs (77, 377) extending in the axial direction from the opening (73) toward the fan (51), wherein the opening in the fan (51) A circumferential fan-side rib (60) extending in the axial direction of the drive shaft (22) is provided on one side surface (58a) on the (73) side, and the fan cover (52) includes the cylindrical portion A cylindrical portion side rib (75) extending in the axial direction from the (71) side toward the fan (51), the cylindrical portion side rib (75), the fan side rib (60), A labyrinth structure (80, 380) is formed by the ribs (77, 377) on the opening side, and the fan (51) includes a plurality of vanes (56) arranged in the circumferential direction of the fan (51). and a top blade (58) connecting the plurality of vane portions (56) in the circumferential direction, the one side surface (58a) being the surface of the top blade (58), and the opening side rib (77 ) are positioned radially inside the fan (51) with respect to the fan-side rib (60), and when viewed in the axial direction of the drive shaft (22), the opening-side ribs (77, 377) and The cylindrical portion side rib (75) overlaps the one side surface (58a), and when viewed in the radial direction of the fan (51), the fan side rib (60) and the cylindrical portion side rib (75) are arranged so as to overlap each other, and the fan side rib (60) and the opening side rib (77, 377) are arranged offset from each other .

In the above configuration, the distance (L) between the fan (51) and the opening (73) in the axial direction is equal to or greater than the thickness (t) of the opening (73). Also good.

Furthermore, in the above configuration, the top blade (58) may have a ring shape connecting the plurality of vane portions (56) in the circumferential direction.
Further, in the above configuration, the fan (51) and the opening side rib (77) may overlap when viewed in the radial direction of the fan (51).

Further, in the above configuration, the surface (58a) of the top blade (58) on which the fan-side ribs (60) are provided connects the inner end (58d) and the outer end (58e) of the top blade (58). When viewed in the radial direction of the fan (51) along at least one of the imaginary straight lines (58f), the tubular portion side rib (75), the fan side rib (60), and the opening At least two of the lateral ribs (77) may overlap .

Further, in the above configuration, the surface (58a) of the top blade (58) on which the fan-side ribs (60) are provided connects the inner end (58d) and the outer end (58e) of the top blade (58). When viewed in the radial direction of the fan (51) along at least one of the imaginary straight lines (58f), the tubular portion side rib (75), the fan side rib (60), and the opening Side ribs (77) may overlap.
Further, in the above configuration, the opening-side rib (77) is circumferentially provided around the opening (73), and the opening-side rib (77) and the fan-side rib (60) may be arranged in a coaxial positional relationship.

In the above configuration, the drive shaft (22) is a drive shaft of the power generator (20) of the saddle type vehicle (1) and extends in the vehicle width direction. The tubular portion (71, 271) may extend outward in the vehicle width direction with respect to the fan (51), and the opening (73) may be arranged on the side surface of the vehicle.
Further, in the above configuration, the power generator (20) is connected to the vehicle body (12) of the straddle-type vehicle (1) through a connecting portion (28a), and the connecting portion (28a) is connected to the Arranged above the drive shaft (22), the fan cover (52) includes an escape portion (52a) recessed toward the fan (51) so as to avoid the connecting portion (28a) when viewed from the side of the vehicle. can be
Further, the one side surface (58a) extends from a portion where the opening side ribs (77, 377) overlap the one side surface (58a) when viewed in the axial direction of the drive shaft (22). ) overlaps the one side surface (58a) is inclined so as to be positioned axially inward of the drive shaft (22) from the radially inner side to the radially outer side of the fan (51). good.

The blower includes a rotating drive shaft, a fan that rotates together with the drive shaft, and a fan cover that covers the fan from the outside in the axial direction of the drive shaft. The fan cover includes a tubular portion extending in the axial direction outside the fan in the axial direction of the drive shaft, an opening provided in the tubular portion and intersecting with the axial direction, and an opening. A circumferential fan-side rib extending in the axial direction of the drive shaft is provided on one side surface of the fan on the opening side, and the tubular portion and the , the fan-side ribs and the opening-side ribs form a labyrinth structure.
According to this configuration, the labyrinth structure formed by the cylindrical portion, the fan-side ribs, and the opening-side ribs reduces the airflow flowing from the radially outer side of the fan to the opening. Therefore, the backflow of the airflow can be reduced.

Further, in the above configuration, the opening-side ribs may be positioned radially inside the fan with respect to the fan-side ribs.
According to this configuration, since the labyrinth structure can be formed at a radially inner position of the fan with respect to the fan-side rib, backflow can be effectively reduced at a position near the opening.
Further, in the above configuration, the distance between the fan and the opening in the axial direction may be equal to or greater than the thickness of the opening.
According to this configuration, a space equal to or greater than the thickness of the opening can be secured between the opening and the fan in the axial direction, and the turbulent flow generated immediately after passing through the opening can be straightened by the space. Therefore, the efficiency of blowing air is good.

Further, in the above configuration, the fan includes a plurality of vane portions arranged in the circumferential direction of the fan, and an annular top blade connecting the plurality of vane portions in the circumferential direction, and the fan-side rib is provided on the top blade. It's okay to be
According to this configuration, the top blade can be used to provide the fan-side rib at a position close to the opening-side rib with a simple structure. Also, the rigidity of the top blade can be increased by the fan-side ribs.
Further, in the above configuration, the fan and the opening side rib may overlap when viewed in the radial direction of the fan.
According to this configuration, the opening side rib can be arranged closer to the fan in the axial direction of the drive shaft, and the labyrinth structure can be narrowed. Therefore, the backflow of the airflow can be effectively reduced.

Further, in the above-described configuration, the fan cover may include a tubular portion-side rib extending axially from the tubular portion side toward the fan.
According to this configuration, the labyrinth structure can be formed into a complicated shape by the tubular portion side ribs, and the backflow of the airflow can be effectively reduced.
In the above configuration, when viewed in the radial direction of the fan along at least one of the surface on which the fan-side ribs are provided on the top blade and the imaginary straight line connecting the inner end and the outer end of the top blade, At least two of the tubular portion, the fan-side rib, and the opening-side rib may overlap.
According to this configuration, the airflow passage of the labyrinth structure can be bent, and the backflow of the airflow can be effectively reduced.

In the above configuration, when viewed in the radial direction of the fan along at least one of the surface on which the fan-side ribs are provided on the top blade and the imaginary straight line connecting the inner end and the outer end of the top blade, At least two of the cylindrical portion-side rib, the fan-side rib, and the opening-side rib may overlap.
According to this configuration, the airflow passage of the labyrinth structure can be bent, and the backflow of the airflow can be effectively reduced.
Furthermore, in the above configuration, when viewed in the radial direction of the fan along at least one of the surface on which the fan-side ribs are provided on the top blade and an imaginary straight line connecting the inner end and the outer end of the top blade, The tubular portion, the fan-side rib, and the opening-side rib may overlap.
According to this configuration, the airflow passage of the labyrinth structure can be bent at a plurality of locations, and the backflow of the airflow can be effectively reduced.

In the above configuration, when viewed in the radial direction of the fan along at least one of the surface on which the fan-side ribs are provided on the top blade and the imaginary straight line connecting the inner end and the outer end of the top blade, The cylindrical portion side rib, the fan side rib, and the opening side rib may overlap.
According to this configuration, the airflow passage of the labyrinth structure can be bent at a plurality of locations, and the backflow of the airflow can be effectively reduced.
Further, in the above configuration, the opening-side rib may be circumferentially provided around the opening, and the opening-side rib and the fan-side rib may be arranged in a coaxial positional relationship.
According to this configuration, the labyrinth structure can be circumferentially provided around the opening, and the backflow of the airflow can be effectively reduced.

Further, in the above configuration, the drive shaft is a drive shaft of a power generator for a saddle type vehicle and extends in the vehicle width direction, and the fan cover has a cylindrical portion extending outward in the vehicle width direction with respect to the fan. In addition, the opening may be arranged so as to face the side of the vehicle.
According to this configuration, when the opening is positioned on the side of the vehicle, it becomes difficult to suck in air from the opening. Air can be sucked in efficiently and backflow of air can be reduced.
Further, in the above configuration, the power generator is connected to the vehicle body of the straddle-type vehicle via a connecting portion, the connecting portion is disposed above the drive shaft, and the fan cover is connected when viewed from the side of the vehicle. It is also possible to provide an escape portion recessed on the fan side so as to avoid the part.
According to this configuration, when the relief portion is formed, the passage of the airflow becomes narrower and the airflow tends to flow backward, but the backflow can be reduced by the labyrinth structure.

1 is a right side view of the motorcycle according to the first embodiment of the invention; FIG. Fig. 3 is a right side view of the rear portion of the motorcycle; 1 is a cross-sectional view of a unit swing engine; FIG. FIG. 3 is a sectional view taken along IV-IV in FIG. 2; It is the perspective view which looked at the fan from the vehicle width direction outer side. It is the side view which looked at the fan cover from the vehicle width direction inner side. It is the perspective view which looked at the fan cover from the vehicle width direction inner side. FIG. 10 is a diagram showing the result of analyzing the flow of air currents using a fluid analysis program; 3 is a view corresponding to the IV-IV cross-sectional view of FIG. 2 in the second embodiment; FIG. 3 is a view corresponding to the IV-IV cross-sectional view of FIG. 2 in the third embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, directions such as front, rear, left, right, and up and down are the same as the directions with respect to the vehicle body unless otherwise specified. In each figure, FR indicates the front of the vehicle body, UP indicates the upper side of the vehicle body, and RH indicates the right side of the vehicle body.

[First embodiment]
FIG. 1 is a right side view of a motorcycle 1 according to the first embodiment of the invention. FIG. 2 is a right side view of the rear part of the motorcycle 1. FIG.
The motorcycle 1 is a scooter-type saddle-ride type vehicle having a low step floor 11 on which a passenger sitting on a seat 10 puts his/her feet. A motorcycle 1 has a front wheel 2 in front of a body frame 12 (body) (Fig. 2), and a rear wheel 3, which is a drive wheel, is pivotally supported by a unit swing engine 13 arranged at the rear of the vehicle.

The motorcycle 1 includes a front fork 14 pivotally supported on the front end of a vehicle body frame 12 , and the front wheel 2 is pivotally supported on the lower end of the front fork 14 . A steering wheel 15 steered by an occupant is attached to the upper end of the front fork 14 above the front of the seat 10 .
The motorcycle 1 includes a vehicle body cover 16 that covers the vehicle body such as the vehicle body frame 12 .
Note that the body cover 16 is not shown in FIG. 2 .

The unit swing engine 13 is a unit swing type engine in which an engine body 20 (power generator), which is an internal combustion engine, and an arm portion 21 supporting the rear wheels 3 are integrated. The unit swing engine 13 is located directly below the seat 10 as viewed from the side of the vehicle.
The rear wheel 3 is supported by a rear wheel axle 3 a provided at the rear end of the arm portion 21 .

The engine body 20 includes a crankcase 23 that supports a crankshaft 22 (drive shaft) extending in the vehicle width direction (horizontal direction), and a cylinder portion 24 extending forward from the crankcase 23 .
The cylinder portion 24 includes, in order from the crankcase 23 side, a cylinder 24a, a cylinder head 24b, and a head cover 24c.
The engine body 20 is a horizontal engine in which the cylinder axis 24d of the cylinder portion 24 extends substantially horizontally in the vehicle front-rear direction. Specifically, the cylinder portion 24 extends substantially horizontally toward the front of the vehicle in a slightly upward forward direction when viewed from the side of the vehicle.

The vehicle body frame 12 includes a pair of left and right rear frames 12 a that extend rearwardly upward in front of the crankcase 23 . The cylinder portion 24 extends forward from the crankcase 23 and is positioned in the space between the left and right rear frames 12a.
The unit swing engine 13 is swingably supported by the rear frame 12 a via a link mechanism 28 provided above the unit swing engine 13 .
The link mechanism 28 includes a swing shaft 28a (connecting portion) connected to the upper portion of the crankcase 23, a pair of left and right vehicle body side swing shafts 28b connected to the upper portions of the left and right rear frames 12a, and the swing shaft 28a. and a link member 28c connecting the body-side swing shaft 28b.

The rocking shaft 28a and the vehicle body side rocking shaft 28b are horizontal shafts extending in the vehicle width direction.
The link member 28c includes a pair of left and right first pivot portions 28d connected to the rear frame 12a via a vehicle body-side swing shaft 28b, and a rod-shaped left and right connecting portion connecting the left and right first pivot portions 28d in the vehicle width direction. and a second pivot portion 28f that extends downward from an intermediate portion in the vehicle width direction of the left and right connecting portion 28e and is connected to the swing shaft 28a.
The unit swing engine 13 can swing about the swing shaft 28a and the vehicle body side swing shaft 28b. The swing shaft 28 a is arranged above the crankshaft 22 .
The arm portion 21 of the unit swing engine 13 is arranged on one of the left and right sides (left side) of the rear wheel 3 . A rear cushion (not shown) is stretched between the rear end portion of the arm portion 21 and the rear portion of the rear frame 12a.

The intake device of the unit swing engine 13 includes an air cleaner box 32 and a throttle body (not shown) arranged in front of the air cleaner box 32 .
The air cleaner box 32 is attached to the upper portion of the arm portion 21 . The throttle body is connected to an intake port on the upper surface of the cylinder head 24b.

The exhaust pipe 33 extends downward from an exhaust port on the lower surface of the cylinder head 24b, passes through the right side of the unit swing engine 13, and extends rearward. A muffler 34 is connected to the rear end of the exhaust pipe 33 . The muffler 34 is arranged on the other left and right sides (right side) of the rear wheel 3 and overlaps the rear wheel 3 from the outside in the vehicle width direction.

FIG. 3 is a sectional view of the unit swing engine 13. As shown in FIG. FIG. 3 is a top view of a cross section passing through the axes of the camshaft 39, the crankpin 38, the crankshaft 22, the transmission mechanism 43, and the speed reduction mechanism 45 of the valve train of the cylinder head 24b.
The crankcase 23 includes a crank chamber 35 that accommodates the crankshaft 22 extending in the vehicle width direction. The crank chamber 35 has a pair of left and right support walls 35 a and 35 b orthogonal to the crankshaft 22 . The crankshaft 22 is supported by support walls 35a and 35b via bearings.
The piston 36 reciprocates in the cylinder 24a in the axial direction of the cylinder axis 24d. Piston 36 is connected to crankshaft 22 via connecting rod 37 and crankpin 38 .
A valve train is provided in the cylinder head 24b. The camshaft 39 of the valve train is parallel to the crankshaft 22 .

Crankcase 23 integrally includes a transmission case portion 40 extending rearward from one of the left and right sides (left side) of crank chamber 35 . The transmission case portion 40 extends from the side portion of the crank chamber 35 to the left side of the rear wheel 3 .
The transmission case portion 40 is formed in a case shape with an open outer surface in the vehicle width direction. The open portion of the outer surface of transmission case portion 40 is closed by a case cover 41 attached to the outer surface of transmission case portion 40 .

The arm portion 21 of the unit swing engine 13 is composed of a transmission case portion 40 and a case cover 41 . The arm portion 21 is hollow.
In the arm portion 21, there are provided a transmission mechanism 43 for transmitting the rotation of the crankshaft 22 to the rear wheel 3 side, a centrifugal clutch mechanism 44, and a reduction mechanism 45 composed of a plurality of gears. .
The driving force of the crankshaft 22 is transmitted to the rear wheel axle 3a via the transmission mechanism 43, the clutch mechanism 44, and the reduction mechanism 45. As shown in FIG.

One end 22a of the crankshaft 22 passes through the left support wall 35a and is positioned within the arm portion 21 .
The transmission mechanism 43 is a belt-type continuously variable transmission, and is supported by a drive pulley 43a provided at one end portion 22a of the crankshaft 22, an output shaft 43b provided at the rear portion of the arm portion 21, and the output shaft 43b. A driven pulley 43c and a V-belt 43d connecting the drive pulley 43a and the driven pulley 43c are provided. The clutch mechanism 44 is provided on the output shaft 43b. The output shaft 43b is connected to the rear wheel axle 3a via a speed reduction mechanism 45. As shown in FIG.

The other end 22b of the crankshaft 22 extends outwardly of the crankcase 23 through the right support wall 35b.
A flywheel 47 that rotates integrally with the crankshaft 22 is fixed to the other end 22b of the crankshaft 22 .
Inside the flywheel 47, a generator 48 that generates power by the rotation of the crankshaft 22 is provided. The generator 48 includes a magnet 48a fixed to the inner circumference of the flywheel 47, and a coil 48b arranged radially inside the flywheel 47 with respect to the magnet 48a. Coil 48 b is fixed to crankcase 23 .

The unit swing engine 13 includes an air blower 50 that blows air toward the engine body 20 to air-cool the engine body 20 .
The blower 50 includes a crankshaft 22, a fan 51 fixed to the crankshaft 22 and rotating integrally with the crankshaft 22, a fan cover 52 covering the fan 51 from the outside, and a cylinder section cover 53 covering the cylinder section 24. Prepare.

The cylinder part cover 53 is provided so as to surround the cylinder 24a and the cylinder head 24b from the periphery of the cylinder axis 24d, and covers the cylinder 24a and the cylinder head 24b substantially over the entire periphery.
A space formed between the cylinder section cover 53 and the cylinder section 24 is an air passage 54 through which the airflow sent by the fan 51 passes. In the air passage 54, cooling fins 49 are provided on the outer surface of the cylinder 24a.
The fan cover 52 is attached to the outer side surface portion 23a of the crankcase 23 in the vehicle width direction, and covers the outer side surface portion 23a and the fan 51 from the outside in the vehicle width direction. A front edge portion of the fan cover 52 is connected to a rear edge portion of the cylinder portion cover 53 , and a space inside the fan cover 52 communicates with the air passage 54 .

The fan 51 is fastened to the outer side surface of the flywheel 47 in the vehicle width direction. That is, the fan 51 is fixed to the axial end of the crankshaft 22 via the flywheel 47 .
The fan 51 rotates integrally with the crankshaft 22 , sucks air from the outside through the fan cover 52 , and blows the air sucked inside the fan cover 52 to the outside in the radial direction of the fan 51 .
The airflow blown out by the fan 51 passes through the air passage 54 and reaches around the cylinder 24a and the cylinder head 24b to cool the cylinder 24a and the cylinder head 24b.
That is, the engine body 20 is of a forced air cooling type in which the engine body 20 is forcibly air-cooled by blowing air from the fan 51 driven by the crankshaft 22 .
The airflow in the air passage 54 is discharged to the outside from an outlet (not shown) provided in the cylinder section cover 53 .

FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a perspective view of the fan 51 viewed from the outside in the vehicle width direction.
4 and 5, the fan 51 includes a disk-shaped base portion 55 positioned at the center of rotation of the fan 51, and a plurality of blades arranged in the base portion 55 at substantially equal intervals in the circumferential direction of the fan 51. and an annular top blade 58 connecting the plurality of vane portions 56 in the circumferential direction of the fan 51 .

The base portion 55 is arranged on an extension of the axis 22 c of the crankshaft 22 . The rotation center of the fan 51 coincides with the axis 22 c that is the rotation center of the crankshaft 22 . The axial direction of the crankshaft 22 is the extending direction of the axis 22c and coincides with the vehicle width direction.
The fan 51 is fastened to the flywheel 47 by a fastener 59 (FIG. 4) inserted through a fixing hole 55a (FIG. 5) of the base portion 55 from the outside in the vehicle width direction.

Each wing portion 56 is a plate-like portion erected in the axial direction of the crankshaft 22 from the peripheral portion of the base portion 55 toward the outside in the vehicle width direction. Each blade portion 56 extends radially outward of the fan 51 from the peripheral portion of the base portion 55 when viewed in the axial direction of the crankshaft 22 .
Assuming that the direction in which the blade portion 56 is erected from the base portion 55 is the height direction of the blade portion 56 , the height of the blade portion 56 decreases from the center side of the fan 51 toward the outside in the radial direction. That is, the tip edge 56a of the vane portion 56 in the height direction is inclined downward toward the outside in the radial direction of the fan 51 . It should be noted that the reference numerals of the tip edges 56a are attached only to a part of the plurality of tip edges 56a.

The top blade 58 is an annular plate arranged coaxially with the axis 22 c of the crankshaft 22 when viewed in the axial direction of the crankshaft 22 . The top blade 58 rotates integrally with the vane portion 56 about the axis 22c. The top blade 58 is coupled to the tip edge 56 a of each vane 56 from the outside in the axial direction of the crankshaft 22 to connect the vanes 56 to each other in the circumferential direction of the fan 51 . Top blade 58 increases the strength and stiffness of fan 51 .
The upper surface 58a of the top blade 58 (one side surface on the opening side, the surface on which the fan-side ribs are provided) extends along the tip edge 56a of the vane portion 56 and slopes downward toward the radially outer side of the fan 51. . In other words, the upper surface 58 a of the top blade 58 , which is the axially outer surface of the crankshaft 22 , is inclined so as to be positioned axially inward of the crankshaft 22 as it goes radially outward from the radially inner side of the fan 51 .
The upper surface 58 a of the top blade 58 is the outer surface of the fan 51 in the vehicle width direction and the surface of the fan 51 on the fan cover 52 side in the axial direction of the crankshaft 22 .

A fan-side rib 60 extending in the axial direction of the crankshaft 22 toward the fan cover 52 side is provided on the upper surface 58 a of the top blade 58 of the fan 51 .
The fan-side rib 60 has a circumferential shape coaxial with the axis 22 c of the crankshaft 22 when viewed in the axial direction of the crankshaft 22 .
The fan-side rib 60 is arranged between the inner peripheral edge 58b of the top blade 58 and the outer peripheral edge 58c of the top blade 58, in an intermediate portion between the inner peripheral edge 58b and the outer peripheral edge 58c.

FIG. 6 is a side view of the fan cover 52 viewed from the inside in the vehicle width direction. FIG. 7 is a perspective view of the fan cover 52 viewed from the inside in the vehicle width direction.
2, 4, 6, and 7, the fan cover 52 includes a side wall portion 65 that covers the outer side surface portion 23a of the crankcase 23 and the fan 51 from the outside in the vehicle width direction, and a peripheral edge portion of the side wall portion 65. A peripheral wall portion 66 extends inward in the vehicle width direction and surrounds the fan 51 from its surroundings.

An open portion 66a that opens forward is formed in the front surface of the peripheral wall portion 66 of the fan cover 52, and the space inside the fan cover 52 passes through the open portion 66a to the air passage 54 of the cylinder portion cover 53 (see FIG. 3). ).
The fan cover 52 includes an upper mounting portion 67 extending upward from the upper portion of the peripheral wall portion 66 and a lower mounting portion 68 extending downward from the lower portion of the peripheral wall portion 66 .
The fan cover 52 also has a plurality of front mounting portions 69 on the front edge portion of the side wall portion 65 .

The fan cover 52 is secured by a fastener 67a (FIG. 2) inserted through the upper mounting portion 67 from the outside in the vehicle width direction and a fastener 68a (FIG. 2) inserted through the lower mounting portion 68 from the outside in the vehicle width direction. , are fastened to the outer side surface portion 23 a of the crankcase 23 .
When the fan cover 52 is attached to the crankcase 23 , the inner end surface 66 b of the peripheral wall portion 66 in the vehicle width direction contacts the outer side surface portion 23 a of the crankcase 23 .
A front end portion of the fan cover 52 is connected to a rear end portion of the cylinder portion cover 53 by a fastener 69 a ( FIG. 2 ) inserted through the front mounting portion 69 from the outside in the vehicle width direction.

The fan cover 52 includes an exhaust pipe cover portion 70 extending outward and downward in the vehicle width direction from the lower portion of the side wall portion 65 . The exhaust pipe cover portion 70 covers the exhaust pipe 33 that passes under the fan cover 52 in the front-rear direction from above and from the outside.

The side wall portion 65 of the fan cover 52 includes a cylindrical portion 71 extending in the axial direction of the crankshaft 22 outside the fan 51 in the axial direction of the crankshaft 22 and a mesh portion 72 intersecting the axis 22c of the crankshaft 22 (mesh portion 72). ) is formed in the cylinder of the tubular portion 71 . The opening 73 is a louver portion that allows airflow to pass through the mesh portion 72 .

The cylindrical portion 71 has a cylindrical shape that protrudes outward in the vehicle width direction with respect to the portion of the side wall portion 65 surrounding the cylindrical portion 71 . The cylindrical portion 71 overlaps the fan 51 from the outside in the vehicle width direction when viewed in the axial direction of the crankshaft 22 (side view of the vehicle).
Specifically, the cylindrical portion 71 is cylindrical and coaxial with the axis 22c of the crankshaft 22, and overlaps the top blade 58 of the fan 51 from the outside in the vehicle width direction when viewed in the axial direction of the crankshaft 22.

The fan cover 52 includes a tubular portion-side rib 75 extending in the axial direction of the crankshaft 22 from the inner end portion of the tubular portion 71 in the vehicle width direction toward the fan 51 .
The cylindrical portion-side rib 75 has a circumferential shape coaxial with the axis 22 c of the crankshaft 22 when viewed in the axial direction of the crankshaft 22 .
The cylindrical portion side rib 75 overlaps the top blade 58 of the fan 51 from the outside in the vehicle width direction when viewed in the axial direction of the crankshaft 22 .
The tubular portion-side rib 75 is provided on the tubular portion 71 so as to extend the tubular portion 71 toward the fan 51. However, the tubular portion-side rib 75 is not limited to this. , may be provided on the inner surface of the side wall portion 65 at a position radially outside the cylindrical portion 71 .

A tapered portion 71a is provided at the outer end portion of the cylindrical portion 71 in the vehicle width direction so that the inner diameter of the cylindrical portion 71 decreases toward the outer side in the vehicle width direction (outer side in the axial direction of the crankshaft 22).
The opening 73 includes an inner tubular portion 76 extending inward in the vehicle width direction (inward in the axial direction of the crankshaft 22) from the inner peripheral portion of the tapered portion 71a of the tubular portion 71 toward the fan 51, and a mesh portion. 72.
The inner tubular portion 76 is a cylindrical frame that supports the mesh portion 72 and is arranged coaxially with the axis 22 c of the crankshaft 22 . That is, the inner tubular portion 76 is arranged inside the tubular portion 71 in a coaxial positional relationship with the tubular portion 71 .

The mesh portion 72 of the opening portion 73 is a disk-shaped plate member having a plurality of holes 72 a penetrating in the axial direction of the crankshaft 22 . The mesh portion 72 is located on the vehicle side surface of the motorcycle 1 .
The mesh portion 72 is formed in a curved surface shape so that a center portion 72b located on an extension of the axis 22c of the crankshaft 22 protrudes most outward in the axial direction of the crankshaft 22. As shown in FIG. The mesh portion 72 is curved so as to approach the fan 51 side as it goes radially outward from the central portion 72b. That is, the inner side surface 72c of the mesh portion 72 in the vehicle width direction is formed in a curved shape so as to constitute a part of the inner circumference of the sphere. An inner side surface 72 c of the mesh portion 72 is a surface that faces the axially outer side surface of the crankshaft 22 in the fan 51 and faces the upper surface 58 a of the top blade 58 . An upper surface 58 a of the top blade 58 is one side surface of the fan 51 on the opening 73 side.

The fan cover 52 includes opening-side ribs 77 extending in the axial direction of the crankshaft 22 from the opening 73 toward the fan 51 .
The opening-side rib 77 has a circumferential shape coaxial with the axis 22 c of the crankshaft 22 when viewed in the axial direction of the crankshaft 22 .
The opening-side rib 77 overlaps the top blade 58 of the fan 51 from the outside in the vehicle width direction when viewed in the axial direction of the crankshaft 22 .

The opening-side rib 77 is formed by extending the inner tubular portion 76 toward the fan 51 in the axial direction of the crankshaft 22 . The opening-side rib 77 protrudes toward the fan 51 from the inner surface 72 c of the mesh portion 72 . When viewed in the axial direction of the crankshaft 22 , the opening-side ribs 77 surround the mesh portion 72 from the periphery.
The fan cover 52 is arranged so that a gap is formed between the tip of the opening side rib 77 and the fan 51 in the axial direction of the crankshaft 22 .
Since the opening side rib 77 is arranged between the mesh portion 72 and the fan 51, the interval between the mesh portion 72 and the fan 51 is relatively large. Specifically, in the axial direction of the crankshaft 22 , the distance L between the inner side surface 72 c of the mesh portion 72 and the tip edge 56 a of the fan 51 is equal to or greater than the thickness t of the mesh portion 72 .
A space 78 surrounded by the opening side ribs 77 is formed between the mesh portion 72 and the fan 51 .

Referring to FIG. 4, a portion 56b of the tip edge 56a of the blade portion 56 is positioned within the space 78, and when viewed in the radial direction of the fan 51, the tip edge 56a of the fan 51 and the opening side rib 77 are separated from each other. Overlap. That is, the fan 51 and the opening side rib 77 partially overlap in the axial direction of the crankshaft 22 .

With reference to FIGS. 2, 6 and 7, in the upper part of the fan cover 52, below the swing shaft 28a, a peripheral wall portion 66 and a side wall portion 65 are recessed toward the fan 51 so as to avoid the swing shaft 28a. A portion 52a is provided. By providing the relief portion 52a, the fan cover 52 does not interfere with the swing shaft 28a, and the swing shaft 28a can be assembled to the crankcase 23 from the outside in the vehicle width direction.
Since the distance between the inner surface of the fan cover 52 and the outer circumference of the fan 51 is reduced in the portion where the relief portion 52a is provided, the pressure and speed of the airflow flowing through the fan cover 52 are likely to change.

Referring to FIG. 4, the top blade 58 of the fan 51, the tubular portion side rib 75, the fan side rib 60, and the opening side rib 77 reduce the backflow of the airflow from the outer peripheral side of the fan 51 to the opening 73 side. A labyrinth structure 80 is formed.
The cylindrical portion-side rib 75 is positioned radially outward of the fan 51 with respect to the fan-side rib 60 , and is positioned radially outward of the fan-side rib 60 when viewed in the axial direction of the crankshaft 22 . Overlapping from outside direction. A gap is formed in the axial direction of the crankshaft 22 between the tip of the cylindrical portion side rib 75 and the upper surface 58 a of the top blade 58 .

The opening-side rib 77 is positioned radially inward of the fan 51 with respect to the fan-side rib 60, and extends radially inward of the fan-side rib 60 from the top blade 58 in the axial direction of the crankshaft 22. overlapping from the outside. A gap is formed in the axial direction of the crankshaft 22 between the tip of the opening side rib 77 and the upper surface 58 a of the top blade 58 .
The tip of the cylindrical portion-side rib 75 extends further inside the crankshaft 22 in the axial direction than the tip of the opening-side rib 77 .
The fan-side rib 60 is located between the tubular portion-side rib 75 and the opening portion-side rib 77 in the radial direction of the fan 51 and extends toward the space 81 between the tubular portion 71 and the inner tubular portion 76 . extension.
The cylinder-side rib 75, the fan-side rib 60, and the opening-side rib 77 are each circumferential and arranged coaxially with each other.

Here, the flow of the airflow W generated by the air blower 50 will be described.
Referring to FIG. 4 , when fan 51 rotates integrally with crankshaft 22 , air outside fan cover 52 is sucked as airflow W through mesh portion 72 . The airflow W flows inward in the vehicle width direction through the mesh portion 72 , enters a space 78 surrounded by the opening-side ribs 77 , is guided by the opening-side ribs 77 , and is sucked into the fan 51 .
In the air blower 50 , a distance L equal to or greater than the thickness t of the mesh portion 72 is provided between the inner side surface 72 c of the mesh portion 72 and the tip edge 56 a of the fan 51 . Therefore, even if turbulence occurs in the airflow W immediately after passing through the inner surface 72c, the turbulence is rectified into an orderly flow when passing through the relatively long flow path of the distance L. Therefore, the fan 51 blows air efficiently.

The airflow W sucked into the fan 51 is blown out radially outward of the fan 51, passes through the inside of the fan cover 52, flows into the air passage 54 in the cylinder section cover 53, and air-cools the cylinder section 24. - 特許庁
The pressure of the airflow W on the outer peripheral side of the fan 51 may be higher than the pressure of the airflow W on the opening 73 side. In this case, part of the airflow W may pass through the gap between the fan 51 and the fan cover 52 and flow back from the outer peripheral side of the fan 51 to the opening 73 side.

Since the labyrinth structure 80 is provided between the fan 51 and the fan cover 52 in the air blower 50, the labyrinth structure 80 acts as a resistance to the backflowing airflow W1, thereby reducing the backflow.
The labyrinth structure 80 is formed by the top blade 58, the fan-side rib 60 provided on the top blade 58, the cylindrical portion-side rib 75 overlapping the top blade 58 when viewed in the axial direction of the crankshaft 22, and the opening-side rib 77. be. Therefore, the labyrinth structure 80 can be formed with a simple structure.

When the labyrinth structure 80 is viewed in the radial direction of the fan 51 along the upper surface 58a of the top blade 58, that is, in the direction of arrow D in FIG. Three of the side ribs 77 overlap each other. Therefore, the backward airflow W1 flows in a meandering manner so as to bend a plurality of times when passing through the labyrinth structure 80 . Therefore, the resistance against backflow can be increased, and the labyrinth structure 80 can effectively reduce the backflow.
FIG. 4 also shows an imaginary straight line 58f that connects the radially inner end 58d and the radially outer end 58e of the upper surface 58a of the top blade 58. As shown in FIG. When the labyrinth structure 80 is viewed along the imaginary straight line 58f in the radial direction of the fan 51, the three ribs 75, 60, and 77 overlap each other. For example, when the upper surface 58a is not flat as shown in FIG. 4 but is curved in a circular arc in a cross-sectional view, three of the cylindrical portion side rib 75, the fan side rib 60, and the opening portion side rib 77 are It suffices if they overlap each other when viewed in the radial direction of the fan 51 along the imaginary straight line 58f.
That is, when viewed in the radial direction of the fan 51 along at least one of the upper surface 58a of the top blade 58 and the imaginary straight line 58f, the tubular portion-side rib 75, the fan-side rib 60, and the opening portion-side rib 77 are Overlap.

FIG. 8 is a diagram showing the result of analyzing the flow of airflow using a fluid analysis program.
The direction of the arrow in FIG. 8 indicates the direction of the airflow, and the length of the arrow in FIG. 8 indicates the magnitude of the speed of the airflow.
The left column indicated by reference numeral 100 in FIG. 8 shows the analysis results of the airflow of the blower 50 . The right-hand column indicated by reference numeral 200 in FIG. 8 shows the analysis results of airflow in a comparative example in which the opening side rib 77 is removed from the blower device 50 .
In the air blower 50, in the area A1 near the opening-side rib 77, the airflow in the direction of counterflow is reduced with respect to the corresponding area A1 of the comparative example.
In addition, in the air blower 50, in the region A2 near the cylindrical portion side rib 75, the speed of the airflow in the counterflow direction is lower than that in the corresponding region A2 of the comparative example.
In this way, the analysis result was obtained that the backflow of the airflow is reduced by the labyrinth structure 80 having the opening side ribs 77 .

As described above, according to the first embodiment to which the present invention is applied, the blower device 50 includes the rotating crankshaft 22, the fan 51 rotating integrally with the crankshaft 22, and the fan 51 connected to the crankshaft. The fan cover 52 covers the crankshaft 22 from the outside in the axial direction of the crankshaft 22 and blows out the air sucked through the fan cover 52 by the rotation of the fan 51 to the outside in the radial direction of the fan 51 . A cylindrical portion 71 extending in the axial direction outside the axial direction, an opening 73 provided in the cylindrical portion 71 and intersecting with the axial direction, and an opening extending axially from the opening 73 toward the fan 51 A circumferential fan-side rib 60 extending in the axial direction of the crankshaft 22 is provided on one side surface of the fan 51 on the side of the opening 73 . , and the opening-side ribs 77 form a labyrinth structure 80 .
According to this configuration, the labyrinth structure 80 formed by the cylindrical portion 71 , the fan-side ribs 60 , and the opening-side ribs 77 reduces the airflow flowing from the radially outer side of the fan 51 to the opening 73 . Therefore, the backflow of the airflow can be reduced.

Further, the opening-side ribs 77 are positioned radially inside the fan 51 with respect to the fan-side ribs 60 .
According to this configuration, the labyrinth structure 80 can be formed radially inside the fan 51 with respect to the fan-side rib 60 , so that the backflow can be effectively reduced at a position close to the opening 73 .
Further, the distance L between the fan 51 and the opening 73 in the axial direction of the crankshaft 22 is equal to or greater than the thickness t of the opening 73 .
According to this configuration, a space equal to or larger than the thickness t of the opening 73 can be secured between the opening 73 and the fan 51 in the axial direction of the crankshaft 22 , and immediately after passing through the opening 73 . The generated turbulent flow can be rectified by this space. Therefore, the efficiency of blowing air is good.

Further, the fan 51 includes a plurality of blade portions 56 arranged in the circumferential direction of the fan 51 and an annular top blade 58 connecting the plurality of blade portions 56 in the circumferential direction. provided in
According to this configuration, the top blade 58 can be used to provide the fan-side rib 60 at a position close to the opening-side rib 77 with a simple structure. Also, the rigidity of the top blade 58 can be increased by the fan-side ribs 60 .
In addition, when viewed in the radial direction of the fan 51, the fan 51 and the opening side rib 77 overlap each other.
According to this configuration, the opening side rib 77 can be arranged closer to the fan 51 in the axial direction of the crankshaft 22, and the labyrinth structure 80 can be narrowed. Therefore, the backflow of the airflow can be effectively reduced.

The fan cover 52 also includes a tubular portion-side rib 75 axially extending from the tubular portion 71 side toward the fan 51 .
According to this configuration, the labyrinth structure 80 can be formed into a complicated shape by the cylindrical portion-side ribs 75, and the backflow of the airflow can be effectively reduced.
Further, the diameter of the fan 51 is aligned along at least one of the upper surface 58a on which the fan-side ribs 60 are provided in the top blade 58 and an imaginary straight line 58f connecting the inner end 58d and the outer end 58e of the top blade 58. When viewed in the direction, the tubular portion side rib 75, the fan side rib 60, and the opening portion side rib 77 overlap.
According to this configuration, the passage of the airflow of the labyrinth structure 80 can be bent at a plurality of points, and the backflow of the airflow can be effectively reduced.
The opening-side rib 77 is circumferentially provided around the opening 73, and the opening-side rib 77 and the fan-side rib 60 are arranged in a coaxial positional relationship.
According to this configuration, the labyrinth structure 80 can be circumferentially provided around the opening 73, and the backflow of the airflow can be effectively reduced.

The crankshaft 22 is a drive shaft for the engine body 20 of the motorcycle 1 and extends in the vehicle width direction. The fan cover 52 has a tubular portion 71 extending outward in the vehicle width direction with respect to the fan 51 . The opening 73 is arranged so as to face the side of the vehicle.
According to this configuration, when the opening 73 is positioned on the side of the vehicle, it becomes difficult to suck air through the opening 73. Air can be efficiently sucked in from the opening 73 of the airflow, and the backflow of the airflow can be reduced.
Further, the engine main body 20 is connected to the vehicle body frame 12 of the motorcycle 1 via a swing shaft 28a, the swing shaft 28a is arranged above the crankshaft 22, and the fan cover 52 is arranged in a side view of the vehicle. , a relief portion 52a recessed toward the fan 51 side so as to avoid the swing shaft 28a.
According to this configuration, when the relief portion 52a is formed, the passage of the airflow becomes narrower and the airflow tends to flow backward.

The above-described first embodiment shows one mode to which the present invention is applied, and the present invention is not limited to the above-described first embodiment.
In the above-described first embodiment, the crankshaft 22 of the engine body 20 was used as an example of the drive shaft, but the drive shaft is not particularly limited as long as it rotates the fan integrally. For example, the drive shaft may be the shaft of the motor of the electric vehicle or the shaft rotated by this motor.
Further, in the first embodiment, when viewed in the radial direction of the fan 51 in at least one of the direction of the arrow D in FIG. , the fan-side rib 60, and the opening-side rib 77 are described as overlapping each other, but the present invention is not limited to this. At least two of the tubular portion-side rib 75, the fan-side rib 60, and the opening-side rib 77 may overlap. For example, the fan-side rib 60 and the opening-side rib 77 may overlap.
In addition, in the above-described first embodiment, the motorcycle 1 was described as an example of a saddle-ride type vehicle. Alternatively, it may be a saddle type vehicle having four or more wheels.
Further, in the first embodiment, the opening side rib 77 and the cylindrical portion side rib 75 are formed over the entire circumference centering on the axis 22c. The axial center of the side rib 75 is offset from the axis 22c in the radial direction of the fan 51, or the opening side rib 77 and the cylindrical portion side rib 75 are offset on the circumference of the opening side rib 77 and the cylindrical portion side rib 75. There may be a plurality of portions where a portion is not formed.

[Second embodiment]
A second embodiment to which the present invention is applied will be described below with reference to FIG. In the second embodiment, parts configured in the same manner as in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
The second embodiment differs from the above-described first embodiment in that the cylindrical portion-side rib 75 is not provided.

FIG. 9 is a view corresponding to the IV-IV cross-sectional view of FIG. 2 in the second embodiment.
9 and 4, a cylindrical portion 271 according to the second embodiment has a portion 65a connected to the outer periphery of the cylindrical portion 71 in the side wall portion 65 of the fan cover 52 in FIG. It is formed so as to be connected to the tip of the shape of the cylindrical portion side rib 75 .
When viewed in the radial direction of the fan 51 in at least one of the direction of arrow D in FIG. Three of the side ribs 77 overlap each other. The labyrinth structure 280 is composed of the base end portion of the cylindrical portion 271 , the fan-side ribs 60 , the opening-side ribs 77 , and the top blade 58 .
When viewed in the radial direction of the fan 51 in at least one of the direction of the arrow D in FIG. At least two of the ribs 77 may be overlapped. For example, the fan-side rib 60 and the opening-side rib 77 may be overlapped.
In the second embodiment, the opening side ribs 77 are formed along the entire circumference around the axis 22c, but the axis of the opening side ribs 77 extends from the axis 22c in the radial direction of the fan 51. , or there may be a plurality of locations on the circumference of the opening-side rib 77 where the opening-side rib 77 and the tubular-portion-side rib 75 are not partially formed.

[Third Embodiment]
A third embodiment to which the present invention is applied will be described below with reference to FIG. In the third embodiment, parts configured in the same manner as in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
In the third embodiment, the shape of the opening side ribs 377 is different from the opening side ribs 77 of the first embodiment.

FIG. 10 is a view corresponding to the IV-IV cross-sectional view of FIG. 2 in the third embodiment.
The fan cover 52 includes opening-side ribs 377 extending in the axial direction of the crankshaft 22 from the opening 73 toward the fan 51 .
The opening-side rib 377 includes a rib bottom wall 377a extending radially outward from the tip of the opening-side rib 77 of the first embodiment and connected to the inner peripheral portion of the tubular portion 71 . The rib bottom wall 377 a forms a recess 377 b that is recessed toward the opening 73 from the tip of the opening-side rib 377 and the tip of the cylindrical-part-side rib 75 . The recess 377b faces the fan-side rib 60. As shown in FIG.
The labyrinth structure 380 is composed of the tubular portion side rib 75 , the fan side rib 60 , the opening side rib 377 and the top blade 58 .
Further, in the third embodiment, the opening side rib 377 and the cylindrical portion side rib 75 are formed over the entire circumference centering on the axis 22c. The axial center of the side rib 75 is offset from the axis 22c in the radial direction of the fan 51, or the opening side rib 377 and the cylindrical portion side rib 75 are offset on the circumference of the opening side rib 377 and the cylindrical portion side rib 75. There may be a plurality of portions where a portion is not formed.

1 Motorcycle (saddle type vehicle)
12 body frame (body)
20 engine body (power generator)
22 crankshaft (drive shaft)
28a Swing shaft (connecting part)
50 Blower 51 Fan 52 Fan cover 52a Relief portion 56 Wing portion 58 Top blade 58a Upper surface (one side surface on the opening side, the surface on which fan side ribs are provided)
58d Inner end 58e Outer end 58f Imaginary straight line 60 Fan side rib 71, 271 Cylindrical part 73 Opening 75 Cylindrical part side rib 77, 377 Opening side rib 80, 280, 380 Labyrinth structure L Distance t Thickness

Claims (10)

A rotating drive shaft (22), a fan (51) rotating integrally with the drive shaft (22), and a fan cover (52) covering the fan (51) from the outside in the axial direction of the drive shaft (22). and blowing out the air sucked through the fan cover (52) by the rotation of the fan (51) to the outside in the radial direction of the fan (51),
The fan cover (52) includes a cylindrical portion (71) extending in the axial direction outside the drive shaft (22) with respect to the fan (51), and a cylindrical portion (71) extending in the axial direction. An opening (73) provided and intersecting with the axial direction, and an opening side rib (77, 377) extending in the axial direction from the opening (73) toward the fan (51),
A circumferential fan-side rib (60) extending in the axial direction of the drive shaft (22) is provided on one side surface (58a) of the fan (51) on the side of the opening (73),
The fan cover (52) includes a tubular portion side rib (75) extending in the axial direction from the tubular portion (71) side toward the fan (51),
A labyrinth structure (80, 380) is formed by the tubular portion side rib (75), the fan side rib (60), and the opening portion side rib (77, 377),
The fan (51) includes a plurality of vane portions (56) arranged in the circumferential direction of the fan (51), and a top blade (58) connecting the plurality of vane portions (56) in the circumferential direction. , said one side surface (58a) is the surface of said top blade (58);
The opening side rib (77) is positioned radially inside the fan (51) with respect to the fan side rib (60),
When viewed in the axial direction of the drive shaft (22), the opening side ribs (77, 377) and the cylindrical section side ribs (75) overlap the one side surface (58a),
When viewed in the radial direction of the fan (51), the fan-side rib (60) and the cylindrical portion-side rib (75) are arranged to overlap each other, and the fan-side rib (60) and the opening portion-side rib (75) are arranged to overlap each other. (77, 377) are offset from each other . 2. The method according to claim 1, wherein the distance (L) between the fan (51) and the opening (73) in the axial direction is equal to or greater than the thickness (t) of the opening (73). blower. The blower device according to claim 1 or 2, wherein the top blade (58) has an annular shape connecting the plurality of vane portions (56) in the circumferential direction. The blower device according to any one of claims 1 to 3, wherein the fan (51) and the opening side rib (77) overlap when viewed in the radial direction of the fan (51). An imaginary straight line (58f) connecting a surface (58a) of the top blade (58) on which the fan-side rib (60) is provided and an inner end (58d) and an outer end (58e) of the top blade (58) When viewed in the radial direction of the fan (51) along at least one of 5. The blower device according to any one of claims 1 to 4, characterized in that the two overlap. An imaginary straight line (58f) connecting a surface (58a) of the top blade (58) on which the fan-side rib (60) is provided and an inner end (58d) and an outer end (58e) of the top blade (58) When viewed in the radial direction of the fan (51) along at least one of The air blower according to any one of claims 1 to 4, characterized in that: The opening-side rib (77) is circumferentially provided around the opening (73),
The blower device according to any one of claims 1 to 6, wherein the opening-side rib (77) and the fan-side rib (60) are arranged in a coaxial positional relationship. The drive shaft (22) is a drive shaft of the power generator (20) of the saddle type vehicle (1) and extends in the vehicle width direction,
The fan cover (52) is arranged such that the cylindrical portion (71, 271) extends outward in the vehicle width direction with respect to the fan (51) and the opening (73) is positioned on the vehicle side surface. The blower device according to any one of claims 1 to 7, characterized in that: The power generator (20) is connected to the vehicle body (12) of the straddle-type vehicle (1) through a connecting portion (28a),
The connecting portion (28a) is arranged above the drive shaft (22),
9. The blower device according to claim 8, wherein the fan cover (52) is provided with an escape portion (52a) recessed toward the fan (51) so as to avoid the connection portion (28a) when viewed from the side of the vehicle. . The one side surface (58a) extends from a portion where the opening side ribs (77, 377) overlap the one side surface (58a) when viewed in the axial direction of the drive shaft (22). The part overlapping the one side surface (58a) is inclined so as to be positioned axially inward of the drive shaft (22) from the radially inner side to the radially outer side of the fan (51). The air blower according to any one of claims 1 to 9.

Images