Caterpillar Tractor Co.

Frederick D Proksch

Dale H Unruh

Bruce W Miers

Gerald H Welker

A power unit including a liquid-cooled engine, a radiator in fluid communication with the engine for cooling engine coolant, a fan on one side of the radiator for directing air therethrough, and a noise suppressing baffle on the other side of the radiator for altering the path of travel of air exiting the radiator and absorbing fan noise including a housing containing, noise suppressing material. The housing includes the improvement wherein a perforated panel faces the side of the radiator opposite the fan and is slightly spaced therefrom with the panel being pyramid-shaped and extending toward the radiator and presenting at least three generally planar surfaces intersecting at a common point to the radiator.

Fan noise suppressor and baffle

An attenuator for reducing exhaust noise in engines is provided which includes an exhaust pipe having a flared outlet and a frustoconically shaped attenuator member mounted therein. In an alternate embodiment, vents are provided to increase efficiency. In a further alternate embodiment, the exhaust pipe is combined with a muffler.

Device for reducing engine exhaust noise

A fluidic device senses acceleration of a vehicle or the like and may control a fluid motor or other mechanism which is to be actuated in response to acceleration. A nozzle directs a jet of fluid across an open gap in a direction transverse to the direction along which acceleration is to be sensed. Two receiver ports are positioned to receive and divide the fluid jet in the absence of flow deflection. Upon acceleration of the device, inertial effects cause the jet flow to be slightly deflected thereby changing the amount of flow received at one receiver port relative to the other to produce a fluidic signal. The signal may be amplified and caused to actuate a fluid motor. Compensating means are provided to eliminate signal error which might otherwise arise from tilting of the device or from changes in jet fluid viscosity.

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Peoria, IL, United States of America

Frederick D Proksch