Timing chain lubricating system for engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorToshiki Kobayashi
Life of this patent
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Abstract
Sprockets are fixed to ends of camshafts supported in a cylinder head via camshaft holders, and a timing chain is wrapped around these sprockets. An oil drain hole is provided for supplying relief oil of a hydraulic control valve to the timing chain, and an oil jet is provided for issuing a jet of oil at high pressure from the hydraulic control valve to the timing chain. When the engine is rotating at low speed oil is supplied only through the oil drain hole, and when the engine is rotating at high speed, oil is supplied through both the oil jet and the oil drain hole. The timing chain wrapped around the sprockets of the camshafts can thereby be reliably lubricated according to the operational state of the engine.
Claims13
A timing chain lubricating system for an engine in which a sprocket is fixed to an end of a camshaft and a timing chain is wrapped around the sprocket, the timing chain lubricating system comprising:
- a plurality of independently operated oil supply means operative to supply oil to the timing chain, and means for changing the operation of the respective independently operated oil supply means according to the operational state of the engine.
A timing chain lubricating system for an engine in which a sprocket is fixed to an end of a camshaft and a timing chain is wrapped around the sprocket, the timing chain lubricating system comprising:
- a plurality of independently operated oil supply means for supplying oil to the timing chain, the operation of each of the plurality of independently operated oil supply means being changed according to the operational state of the engine, and
- the timing chain lubricating system further comprising:
- an oil jet;
- and
- a hydraulic control valve for switching over between a low speed valve lift and a high speed valve lift, the low speed valve lift being used when the rotational speed of the engine or the engine load is lower than a predetermined value, the high speed valve lift being used when the rotational speed of the engine or the engine load is higher than the predetermined value, the timing chain being lubricated with relief oil from the hydraulic control valve when the low speed valve lift is established and the timing chain being lubricated with valve lift control oil from the hydraulic control valve via the oil jet with the high speed valve lift is established.
Dependencies are inferred from the claim text.