Virbration absorption assembly

Details Virbration absorption assembly Virbration absorption assembly

1999-11-05

2001-04-24

Browne, Lynne H. (Department: 3629)

Rotary shafts, gudgeons, housings, and flexible couplings for ro

Shafting

Particular vibration dampening or balancing structure

C474S148000, C474S156000, C474S161000, C074S574300

Reexamination Certificate

active

06220970

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a vibration absorption assembly and more particularly, to a vibration absorption assembly for use upon a fuel injection pump and which absorbs torsional vibrations emanating from and/or generated by the fuel injection pump.
BACKGROUND OF THE INVENTION
Combustion engines, including without limitation diesel type engines, include various operatively interconnected components, devices, and/or assemblies which cooperatively provide and/or allow fuel to be selectively combusted and to generate rotational torque which allows a vehicle to be driven. Many of these interconnected components, devices, and/or assemblies rotate and move in a desired manner. For example, a fuel injection pump, within a diesel engine, is rotatably moved in order to allow and/or cause fuel to enter various combustion chambers of the engine.
Many of these rotatably movable engine components, such as a fuel injection pump, often experience irregular agitation and/or interruption which tends to cause vibration and, more specifically, torsional type vibration and/or vibrational energy. The torsional vibration is undesirable since it causes fatigue to the vibrating component and/or increases the amount of stress which is transmitted and/or communicated to other adjacent and interconnected assemblies and/or components, potentially damaging these components and undesirably and adversely effecting overall engine operation.
For example, the torsional vibrational energy emanating from the fuel pump increases the stress which is communicated to the chain which typically couples the fuel injection pump to the crankshaft. This stress may cause the chain to break or fail, thereby undesirably causing the engine to fail and to be damaged and/or destroyed. In order to reduce the amount of torsional vibration induced stress and fatigue produced by a rotatably movable engine component, such as a fuel pump, it is desirable to selectively and substantially reduce, dampen, and/or absorb the vibration and/or vibrational energy emanating from that component.
Some attempts have been made to selectively reduce these vibrations by the use of vibration absorbers with rubber type elastic members which were respectively tuned to a particular frequency. Such attempts have failed to adequately function over long periods of time because the elasticity of the constituent rubber material varies greatly with variations in operating temperatures, and over a period of time hot engine oil damages the rubber. Furthermore, such prior attempts did not adequately allow the fuel injection pump, or the other vibrating component upon which these elements were deployed, to be easily serviced and/or quickly removed from the engine.
There is, therefore, a need for a vibration absorption assembly which overcomes some or all of the previously delineated drawbacks of prior vibration absorption assemblies, which substantially reduces and/or dampens the amount of vibration which is generated by and/or which emanates from a diesel fuel injection pump, and which allows the diesel fuel injection pump to be easily and quickly serviced and/or removed from the engine.
SUMMARY OF THE INVENTION
It is a first object of the present invention to provide a vibration absorption assembly which overcomes some or all of the previously delineated drawbacks of prior vibration absorption assemblies.
It is a second object of the invention to provide a vibration absorption assembly which overcomes some or all of the previously delineated drawbacks of prior vibration absorption assemblies and which allows for the selective, efficient, and reliable absorption and/or reduction in the amount of vibrational energy which is generated by and/or which emanates from a diesel type fuel pump.
It is a third object of the invention to provide a vibration absorption assembly which overcomes some or all of the previously delineated drawbacks of prior vibration absorption assemblies and which allows a diesel type fuel injection pump to be easily serviced and/or removed from the engine.
It is a fourth object of the invention to provide a vibration absorption assembly which overcomes some or all of the previously delineated drawbacks of prior vibration absorption assemblies and which allows the vibration absorption assembly to be lubricated, thereby increasing the operating life of the vibration absorption assembly.
According to a first aspect of the present invention, a vibration absorption assembly for use in combination with a vibrating member is provided. The vibration absorption assembly comprises a housing which is mounted upon the selectively vibrating member and which includes at least one cavity; a first aperture which communicates with the at least one cavity; a second aperture which communicates with the at least one cavity and which cooperates with the first aperture, to cause oil to enter the cavity, to traverse the cavity, and to exit the cavity through the second aperture; and a pair of members which are moveably deployed within the cavity and which cooperatively dampen the vibration of the vibrating member, the pair of members being lubricated by the oil which traverses the cavity.
According to a second aspect of the invention, a method for reducing the amount of vibrations emanating from a selectively rotatable member is provided. The method comprises the steps of forming at least one cavity within a portion of the selectively rotatable member, the cavity having opposed first and second end portions which access the cavity; movably disposing a pair of elements within the at least one tapered cavity; and tapering the first of the end portions, effective to substantially prevent the pair of elements from exiting the at least one cavity through the first of the end portions; and selectively covering the second of the end portions, thereby allowing the elements to be selectively and movably captured within the at least one cavity, effective to reduce the vibrations of the member.
These and other features, objects, aspects, and advantages of the present invention will become apparent upon reading the following detailed description in combination with the accompanying drawings.


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William Ker Wilson, Practical Solution of Torsional Vibration Problems, Chapter XXX, pp. 524-559, Vol. Four, Chapman & Hall Ltd.
Neil Hutton, Heavy Duty Engine Noise Reduction Using Torsional Dampers on Fuel Pump Shafts, pp. 703-712, Holset Engineering Ltd.

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