초록 ▼

Fan-shroud structure and mounting which compensates for relative movement between an engine and radiator to prevent contact between a rotating fan and the shroud structure. In one embodiment of the invention, a one-piece fiberglass shroud is provided having a generally rectangular end portion which

Fan-shroud structure and mounting which compensates for relative movement between an engine and radiator to prevent contact between a rotating fan and the shroud structure. In one embodiment of the invention, a one-piece fiberglass shroud is provided having a generally rectangular end portion which is integral with and merges into an opposed annular venturi portion. The rectangular end portion is secured to a bulbous seal which accommodates the relative movement between the engine and radiator to prevent damage to the shroud. In an alternate embodiment, a one-piece fiberglass venturi shroud is provided having a rounded convergent end section, a throat section and a divergent end section. A box-like outer shroud having an opening therein receives the convergent end section and a bulbous seal is fitted around the opening in the outer shroud for engagement with the throat section. The flexible bulbous seal which is interposed between the venturi shroud and the outer shroud accommodates the relative movement between the engine and radiator by yielding or flexing during such movement. Another embodiment of the fan-shroud structure includes a two-piece venturi shroud having separately formed sections of polyurethane and fiberglass. The flexible polyurethane section accommodates relative movement of the fiberglass section by flexing to prevent contact between the rotating fan and shroud structure. In the embodiments of the fan-shroud structure heretofore described, a relatively small clearance is maintained between the blade tips of the fan and the inner periphery of the shroud. However, an alternative embodiment of the fan-shroud structure includes a box section integrally formed with a rounded reverse venturi section that is flared inwardly into the box section. This fan-shroud is mounted to the radiator to provide a fairly large fan tip clearance thereby permitting substantial relative movement between the fan and the shroud.

대표청구항 ▼

A shroud structure for use with a radiator and liquid cooled internal combustion engine having a multi-bladed fan rotatably mounted on said engine intermediate said engine and said radiator, said engine and radiator being mounted for movement relative to each other, said shroud structure including:

A shroud structure for use with a radiator and liquid cooled internal combustion engine having a multi-bladed fan rotatably mounted on said engine intermediate said engine and said radiator, said engine and radiator being mounted for movement relative to each other, said shroud structure including: a one-piece generally rigid fiberglass shroud having a generally rectangular base perimeter portion which is integral with and merges into an opposed annular bell-mouthed venturi perimeter portion; said venturi perimeter portion surrounding said rotatable fan and being attached to said engine such that a small clearance is formed between the blades of said fan and the inner periphery of said venturi portion; said rectangular base perimeter portion being fitted between a pair of finger-like gripping ring portions of a complementary generally rectangular bulbous flexible seal which is secured to said radiator, and said flexible bulbous seal accommodating the relative movement between said engine and radiator to prevent damage to said shroud structure from said rotatable fan.