Chain or belt drive with multiple non-prevalent order sprockets or pulleys
AssigneeBorgWarner Inc.
InventorKevin B Todd
Life of this patent
Estimating the term…
Abstract
Reducing engagement noise in a chain drive or belt drive for an internal combustion engine having a crankshaft having a driving sprocket and at least one shaft having a first driven sprocket and a second driven sprocket, where the driving sprocket and at least one of the first driven sprocket and the second driven sprocket contain a pattern of pitch radii such that the radial variation of the pitch radii excite tensions at non-prevalent orders in a drive system of the internal combustion engine. The non-prevalent engine cycle orders excited by each of the driving sprocket, the first driven sprocket and the second driven sprocket are different.
Claims20
A method of reducing engagement noise in a chain drive or belt drive for an internal combustion engine having a crankshaft having a driving sprocket and at least one driven shaft having at least a first driven sprocket, comprising the steps of:
- determining external excitations within the chain drive to determine engine cycle orders at which tensions occur;
- converting engine cycle orders at which tensions are prevalent to sprocket orders;
- determining sprocket orders which are non-prevalent;
- determining a number of non-prevalent order sprockets for the chain drive or belt drive;
- determining a unique set of non-prevalent orders to be incorporated into each of the number of non-prevalent order sprockets determined for the chain drive or belt drive, such that no non-prevalent order sprocket has the same engine cycle orders;
- incorporating a unique set of at least one non-prevalent order into a radial variation pattern of a sprocket for each of the non-prevalent order sprockets;
- and
- installing the non-prevalent order sprockets in the chain drive or belt drive of the internal combustion engine.
A chain drive or belt drive for an internal combustion engine having a crankshaft having a driving sprocket and at least a first driven sprocket, the chain drive or belt drive comprising:
- the driving sprocket and the at least one driven sprocket being a non-prevalent order random sprocket each comprising:
- a pattern of pitch radii, such that the radial variation of the pitch radii excite tensions at non-prevalent orders in a drive system of the internal combustion engine;
- wherein non-prevalent engine cycle orders in the driving sprocket are different than the non-prevalent engine cycle orders in the at least first driven sprocket;
- and
- a chain engaging the driving sprocket and the at least first driven sprocket.
A chain drive or belt drive for an internal combustion engine having a crankshaft having a driving sprocket and at least one camshaft driving at least one driven sprocket, the chain drive or belt drive comprising at least two sprockets chosen from the driving sprocket and the at least one driven sprocket being a non-prevalent order random sprockets, each comprising:
- a pattern of pitch radii, such that the radial variation of the pitch radii excite tensions at non-prevalent orders in a drive system of the internal combustion engine;
- wherein non-prevalent engine cycle orders in the driving sprocket are different than the non-prevalent engine cycle orders in the at least first driven sprocket;
- and a chain engaging the driving sprocket and the at least first driven sprocket.
Dependencies are inferred from the claim text.