Cooling device and construction machine or working machine equipped with the same

摘要

A cooling device includes: a cooling fan; a shroud provided at an outer circumferential side of the cooling fan; an inner circumferential wall provided on the shroud and adjacent to the outer circumference of the cooling fan; and an outer circumferential wall provided to surround the inner circumferential wall. An air-flow-direction downstream side end of an outer circumferential edge of the cooling fan is positioned at a further downstream position in an air flow direction than an air-flow-direction downstream side end of the inner circumferential wall. An angle between: an line connecting the air-flow-direction downstream side end of the inner circumferential wall to the air-flow-direction downstream side end of the outer circumferential wall in cross section along the air flow direction of the inner circumferential wall and the outer circumferential wall; and a line orthogonal to the air flow direction, is 9 degrees or more and 45 degrees or less.

主权项

1. A cooling device, comprising:
a cooling fan; a shroud provided at an outer circumferential side of the cooling fan; an inner circumferential wall provided on the shroud and spaced apart from an outer circumference of the cooling fan in a radial direction of the cooling fan by a predetermined distance to surround the cooling fan; and an outer circumferential wall provided to surround the inner circumferential wall, an air-flow-direction downstream side end of the outer circumferential wall being positioned at a further downstream position in an air flow direction than an air-flow-direction downstream side end of the inner circumferential wall, at least a portion of the outer circumferential wall including a cylindrical surface, wherein the cooling fan is rotatably disposed in a space radially inside the inner circumferential wall, wherein an air-flow-direction downstream side end of an outer circumferential edge of the cooling fan is positioned at a further downstream position in the air flow direction than the air-flow-direction downstream side end of the inner circumferential wall, wherein the air-flow-direction downstream side end of the outer circumferential wall is positioned at a further upstream position in the air flow direction than the air-flow-direction downstream side end of the outer circumferential edge of the cooling fan, and wherein an angle between: (i) a line connecting the air-flow-direction downstream side end of the inner circumferential wall to the air-flow-direction downstream side end of the outer circumferential wall in a cross section along the air flow direction of the inner circumferential wall and the outer circumferential wall, and (ii) a line orthogonal to the air flow direction, is 9 degrees or more and 45 degrees or less.