초록 ▼

A fan blade mounting system for large air-moving fans includes a radially extending hub strut, a blade root member pivotally coupled to an end of the hub strut for receiving a blade skin, and a tube end located between the blade root member and the hub strut. A pair of resilient mounts are utilized

A fan blade mounting system for large air-moving fans includes a radially extending hub strut, a blade root member pivotally coupled to an end of the hub strut for receiving a blade skin, and a tube end located between the blade root member and the hub strut. A pair of resilient mounts are utilized in the blade root member to effectively pivotally couple the blades to the hub, thus relieving most of the vertical bending moment transferred to the hub and eliminating critical frequencies associated with the fan. The hub strut is connected to the hub of the fan by a stud having right- and left-handed threads and a wall thickness adjacent to the threads sufficient for distributing the stresses substantially uniformly on the threads, thereby improving fatigue resistance. The resilient mounts comprise a metal core and metal sleeve with a resilient elastomeric layer between the core and sleeve. The sleeves are connected to the blade root member and the cores of the two mounts are clamped to the tube end.

대표청구항 ▼

[ What is claimed is:] [1.] A fan comprising:a rotatable hub;a hub strut coupled to and extending generally radially from the hub;a tube end connected to the outer end of the hub strut;a pair of resilient mounts, each mount comprising:an inner rigid core,an outer rigid sleeve coaxial with the core,

[ What is claimed is:] [1.] A fan comprising:a rotatable hub;a hub strut coupled to and extending generally radially from the hub;a tube end connected to the outer end of the hub strut;a pair of resilient mounts, each mount comprising:an inner rigid core,an outer rigid sleeve coaxial with the core, anda layer of resilient elastomer between the core and sleeve for limited circumferential motion;means for positively clamping the cores of the resilient mounts to the tube end, wherein the inner core of each of the resilient mounts comprises a surface that when clamped against a pair of complementary mating surfaces on the tube end positively prevents rotation of the inner core both about its own axis and about the fan axis independently of friction between the mating surfaces;a blade root member coupled to the sleeves of the resilient mounts; andan airfoil blade coupled to the blade root member.