Power unit cooling device

Abstract

To efficiently cool heat generation rotary equipment being a target in a casing.A centrifugal fan 54 is attached to an inner plate 40b of a centrifugal clutch 40 being the heat generation rotary equipment, and an intake port 59a of the casing is arranged in the vicinity of a front face in the axial direction of the centrifugal fan 54. The centrifugal fan 54 is provided with a base plate 86 connected with the inner plate 40b of the centrifugal clutch 40, a plurality of fins 87 provided on the base plate 86, a blow-out hole 88 passing through the base plate 86 in the axial direction between arbitrary ajacent fins 87, and a guide wall 89 for guiding air directed toward an outer side in the radial direction on the base plate 86 into the blow-out hole 88. The air immediately after being introduced from the intake port is blown to the centrifugal clutch in a rear part through the blow-out hole.

Description

technical field [0001] The present invention relates to an air-cooled cooling device for cooling the inside of a case of a power unit used in a vehicle such as a motorcycle with air flow. Background technique [0002] In an automatic two-wheeled vehicle, a power source such as an engine, and a power transmission mechanism such as a clutch and a continuously variable transmission are housed in a case and mounted on a vehicle frame as a power unit. In such a power unit, since various machines such as clutches and transmissions that generate heat during operation are accommodated in the housing, it is necessary to efficiently cool the inside of the housing. Therefore, most power units of this type are equipped with a cooling device that introduces air from the outside of the housing and circulates the air inside the housing to perform heat exchange. [0003] As a conventional cooling device, for example, there is a device in which a centrifugal fan is installed on the drive si...

AI Technical Summary

Problems solved by technology

[0005] Yet this existing cooling device, because its structure is to make the air that introduces circulates inside the housing through the radial blowing effect of the centrifugal fan, therefore, when the position of the heat-generating rotating machinery that produces high heat such as clutch and When the distance between the rotating shafts of the centrifugal fan is large, it is difficult to cool the machine effectively

That is, in the case where the distance between the heat-generating rotating machine targeted for cooling and the rotating shaft of the centrifugal fan is large, the introduced air is warmed by other heat-generating machines while flowing in the housing, so when it reaches the cooling target When the heat-generating rotating machinery, the heat exchange capacity of the air has been reduced

In addition, from the characteristics of the centrifugal fan itself, even if it is arranged coaxially with the heat-generating rotating machine, it cannot directly supply air. The target heat-generating rotating machinery is placed at a certain distance

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