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Engine having camshaft lubrication rail

An engine, camshaft technology, applied to camshaft lubrication. field, which can solve problems such as increased power consumption

Active Publication Date: 2011-09-21
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other lobe lubrication methods use limited oil flow metering to provide oil flow directly to the lobes, which results in excess oil flow to the lobes
This excess oil flow may require additional oil pump capacity to maintain proper oil pressure within the engine, which results in increased power consumption

Method used

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  • Engine having camshaft lubrication rail
  • Engine having camshaft lubrication rail
  • Engine having camshaft lubrication rail

Examples

Experimental program
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Embodiment Construction

[0055] Examples of the present invention will now be described in detail with reference to the accompanying drawings. The following description is merely exemplary in nature and is not intended to limit the invention, its application or uses.

[0056] refer to figure 1 , which shows the engine assembly 10 . Engine assembly 10 may include an engine structure 12 , an exhaust camshaft 14 and an intake camshaft 16 rotatably supported on engine structure 12 , and a lubrication system 18 . In this non-limiting example, engine assembly 10 is shown as an overhead cam engine. It should be understood, however, that the present invention is not limited to overhead camshaft arrangements.

[0057] The engine structure 12 may include a cylinder head 20 and a bearing cap 22 . Although shown as having a one-piece bearing cap, it is to be understood that the invention is equally applicable to arrangements comprising individual bearing caps for each cam bearing. Such as figure 2 As seen ...

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PUM

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Abstract

The invention relates to an engine having camshaft lubrication rail. The engine assembly may include a cylinder head defining a first bearing surface supporting a camshaft, a bearing cap fixed to the cylinder head and a lubrication rail. The first bearing surface may have a first oil inlet extending therethrough. The camshaft may define an axial bore, a first radial passage and a second radial passage. The first radial passage may extend from the axial bore through an outer circumference of the camshaft and may be in communication with the first oil inlet. The second radial passage may extendfrom the axial bore through an outer circumference of the camshaft. The bearing cap may be fixed to the cylinder head and include a first oil outlet in communication with the second radial passage. The lubrication rail may include a second oil inlet in communication with the first oil outlet and a first lubrication supply passage aligned with a camshaft lobe.

Description

technical field [0001] This invention relates to engine lubrication systems, and more particularly to camshaft lubrication. Background technique [0002] This section provides background information related to the present disclosure which does not necessarily constitute prior art. [0003] Engine components can lubricate the camshaft lobes indirectly through leakage oil located at the cam bearings. This technique provides minimal control over where the oil affects the lobes and how much oil is provided to the lobes. Therefore, under extreme operating conditions such as cold low speed operation, the lobes may not be lubricated as desired. Other lobe lubrication methods provide oil flow directly to the lobes with limited oil flow metering, which results in excess oil flow to the lobes. This excess oil flow may require additional oil pump capacity to maintain proper oil pressure within the engine, which results in increased power consumption. Contents of the invention [...

Claims

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Application Information

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IPC IPC(8): F01M9/10F01L1/047
CPCF01M9/101F01M1/06F01L2001/0476F01L2001/0537F01L1/053F01L2810/02F01M2001/064
Inventor D·R·斯塔利J·J·马佐拉三世A·W·海曼J·J·穆恩
Owner GM GLOBAL TECH OPERATIONS LLC