Wedge locking washer with increased corrosion resistance and method for its manufacture

Abstract

Wedge locking washer 1a, 1b comprising a central axis, a central through hole concentric with central axis and defining an inner peripheral axial surface, an outer peripheral axial surface, a first side surface adapted to face and engage another wedge locking washer, said first side comprising a pattern of radially extending cams 7, each cam comprising a first surface inclined in relation to a central plane of the washer and a second surface and wherein the first and the second surface of each cam meet in a radially extending cam edge 7a and wherein the second surface of a first cam meet the first surface of an adjacent cam in a radially extending inner corner 7b, each cam having a height h defined between a bottom plane in which the bottom of the inner corner is arranged and a top plane in which the top of the cam edge is arranged, a zone of smooth transition of the inner corner has a horizontal length a, the inner corner has a height H of at least h / 4 and at most h / 2 defined as the height H in vertical direction from the inner corner bottom to the end of the smooth transition zone, the cam edge having a smooth transition zone, which has a height H' that is equal to or larger than height H of the inner corner of the smooth transition zone, and wherein at least the first surface is surface hardened and electro-polished and / or pickled.

Description

technical field [0001] The present disclosure generally relates to a wedge lock washer according to the preamble of claim 1 . Also, it relates to a method of manufacturing a wedge lock washer comprising cold forming and case hardening. Background technique [0002] A wedge lock washer is a disc-shaped thin plate with a central hole for the shank of the screw, which prevents undesired loosening of the screw joint. Use wedge lock washers to distribute the load on threaded fasteners. This application relates to wedge lock washers, usually used in pairs. A pattern in the form of radially extending cams, also called wedges, is provided on one surface side. In the locking system, two wedge-shaped locking washers are arranged in pairs with the cam sides facing and engaging each other. The largest surface of the cam has an inclination with respect to the horizontal plane which is greater than the pitch of the thread of the screw in such a locking system. This inclination produc...

AI Technical Summary

Problems solved by technology

[0013] Thus, electropolishing of previously known wedge lock washers may result in different amounts of metal being removed from the edge of the cam and from the bottom of the cam

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