Hose co-moldable with plastic tub, in particular for a washing machine

Abstract

Co-moldable hose (1) with washing machine tubs presenting a longitudinal axis (A) and provided with two bearings (C3, C4) which are arranged along the axis (A) at a determined distance from one another, and with a tubular metallic body (2) which extends along the axis (A) and which is in turn provided, for each bearing (C3, C4), with a housing (3, 4) for each relative bearing (C3, C4) which is delimited towards the axis (A) by a respective inner radial surface (53a, 54a); two covering and blocking bodies (83, 84) also being co-molded with the bearings (C3, C4) and with the tubular body (2) inside each housing (3, 4) in a position which is radially intermediate between a relative radial surface (53a, 54a) and a relative bearing (C3, C4) in order to internally cover the housing (3, 4) itself and to block the relative bearing (C3, C4) inside the relative housing (3, 4).

Description

technical field [0001] The present invention relates to a hose co-mouldable with a plastic tub, particularly for washing machines. Background technique [0002] Usually, the hose, which can be co-moulded with the washing machine tub, becomes an integral part of the tub itself, which facilitates the assembly operation of the washing machine, and includes two rolling bearings arranged along the rotation axis of the washing machine tub; A tubular body of material having two end housings for accommodating within its own interior two bearings arranged at a predetermined distance from each other once the bearings are press-fit Inside the housing, the tubular body can be co-molded with the plastic tub. In order to ensure a proper interference fit between the bearing and the housing, the housing is previously machined, in particular by grinding. [0003] The tubular body not only has the function of stiffening the hose, but also holds the two bearings in position during the operat...

AI Technical Summary

Problems solved by technology

However, since the thermal expansion coefficient of the metal material constituting the tubular body is different from that of the metal material constituting the bearing, and since the actual molding conditions include high temperature and high injection pressure, during the molding of the barrel above the hose, The connection between the bearing and the associated housing can become loose, allowing the bearing to move within its housing, and even in the worst case, causing the bearing itself to back out of the housing

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