Preassembled blades of a fan for cooling coolant in a machine/vehicle and a fan provided with said blades

Abstract

Pre-assembled blade (20) for fans (10) for cooling the coolant contained inside the radiator (1) of operating machines and / or vehicles, comprising a blade body (20a) rigidly connected to an axial shank (21), a part of which situated radially on the outside of the blade body is in the form of a cylindrical pin (21b); wherein the shank (21) has a part axially on the outside of the blade body in the form of a cylindrical pin (21b), holes (21c) with internal female threading being formed inside the pin (21b); and in that the blade (20) comprises —a blade flange (22) comprising. a hollow cylindrical body (22a), the opposite end bases of which comprise respectively: a flat edge (22b) provided with through-holes (22c). an inset annular seat (22d); a disk (23) provided with through-holes (23a) and an eccentric recess (23d) for stably containing with friction a pin (24) which is also eccentric, for rotationally actuating the blade about its axis; —screws (25) designed to pass through the through-holes (23a) in the disk (23) and mate with the female thread of the holes (21c) in the pin (21b) in order to fix relative to each other the disk (23), flange (22) and pin (21b), thus ensuring a definite angular alignment of the blade relative to the pin (24) during pre-assembly.

Description

technical field [0001] The invention relates to the blades of a fan for cooling the coolant contained in the radiator of work machines and / or vehicles, in particular agricultural tractors and off-road vehicles, and also to a blade for actuating and controlling the A device in which the fan blades rotate about their axis. Background technique [0002] It is known that work machines and vehicles are driven by heat engines that require cooling of the heat engine by means of coolant stored in a grid radiator and recirculated through the engine; For cooling, the suction action of a rotating fan forces the ambient air across the radiator. [0003] With reference to the very front of the machine / vehicle, three elements are arranged axially with the radiator at the front, the engine behind it and the fan in between. It is also known that in the technical field of vehicles (which are often used where there is a large amount of loose debris, such as agricultural tractors or vehicles...

AI Technical Summary

Problems solved by technology

[0012] Although these devices, mainly of the hydrodynamic type, are able to fulfill their function, they require special means for supplying fluid to the vane movement means, which: are not always present on the vehicle or require the installation of a compressor and connecting pipes , this possibility is not always practical in addition to the added cost

[0013] Furthermore, the position of the blade at various inlet angles of the blade is unstable and requires complex auxiliary locking elements (eg counterweights, etc.) , leading to an undesired and noisy angular oscillation of the blade

[0014] US3420311 describes a system for fastening blades together with means for adjusting the inflow angle of the blades, said system using a double screw / internal thread connection; given that in the structural design of both external and internal threads there is always The inaccuracy of relative rotation puts the blades in an inconstant and uncertain relative angular position, resulting in different orientations of the blades, thereby reducing efficiency

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