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Camshaft drive system for internal combustion engine

A transmission system, camshaft technology, applied in the direction of engine components, machines/engines, transmissions, etc., can solve problems such as damage, irrecoverable engines, and expensive gear transmission construction.

Inactive Publication Date: 2013-08-28
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, gear drives are expensive to construct and produce more noise than chain or belt drives
On the other hand, although a chain and belt drive is less expensive to construct than a gear drive, the inevitable wear of the chain and belt can cause problems for some engines at high mileage because misalignment of the camshaft can cause the camshaft to rotate relative to the The phasing of the engine crankshaft changes as the chain or belt wears and this occurs when the chain or belt tensioner is only applied to one side of the chain or belt, usually the loose side
Such a situation is undesirable for reasons of performance, emissions, fuel economy, and sometimes in some cases ultimately affecting engine life, where the lack of a free-wheeling construction means Additional loss in camshaft phasing can cause irreversible damage to the engine as the engine's pistons can hit the valves at top dead center

Method used

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  • Camshaft drive system for internal combustion engine
  • Camshaft drive system for internal combustion engine
  • Camshaft drive system for internal combustion engine

Examples

Experimental program
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Embodiment Construction

[0017] Such as figure 1 As shown, engine 10 has crankshaft 18 to which drive sprocket 14 is coupled. A camshaft 26 with a camshaft sprocket 22 connected thereto is driven by a flexible power transmission element 30 having a tight side 31 and a loose side 34 . In some embodiments, the working diameter of camshaft sprocket 22 is twice the working diameter of drive sprocket 14 . Those skilled in the art should understand after reading this specification that the flexible power transmission element 30 may include a metal chain or a metal or non-metal belt. The choice of the particular type of flexible power transmission element to be used in the present invention is up to one wishing to practice the invention.

[0018] figure 1 Also shown are two contactors 32 , which are shown as rollers. Those skilled in the art will also understand that the contactor 32 may be smooth or toothed, and this is independent of whether the flexible power transmission element 30 is a chain or a be...

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PUM

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Abstract

A camshaft drive system for an internal combustion engine includes a drive sprocket fixed upon a crankshaft of the engine and a driven sprocket fixed upon a camshaft of the engine. A flexible power transmission element extends between the drive sprocket and driven sprocket. A tensioning device for the flexible power transmission element includes a linear actuator and a number of movable contactors for engaging and tensioning both the slack side and the tight side of the power transmission element, such that proper phasing of the camshaft with respect to the crankshaft is maintained.

Description

technical field [0001] The present invention relates to a mechanism for powering a camshaft of an internal combustion engine operating a cylinder poppet valve through a flexible power transmission member driven by the engine crankshaft. Background technique [0002] Internal combustion engine camshafts are usually driven by a gear train or flexible transmission member such as a chain or belt. Gear trains are often used in heavy-duty engines, such as some diesel engines, and chains or belts are often used in gasoline engines and medium-duty diesel engines. . The gear train provides the most precise control of the camshaft position throughout the useful life of the engine. However, gear drives are expensive to construct and generate more noise than chain or belt drives. On the other hand, although a chain and belt drive is less expensive to construct than a gear drive, the inevitable wear of the chain and belt can cause problems for some engines at high mileage because misal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L1/348
CPCF16H2007/0874F16H7/08F01L1/348F16H2007/0812F16H7/1281F16H2007/0893F01L1/024
Inventor 加里·弗尔塞克迈克尔·马格南邱金辉
Owner FORD GLOBAL TECH LLC