Unlock instant, AI-driven research and patent intelligence for your innovation.

Concentric camshaft with independent bearing surface for floating lobes

A camshaft and bearing technology, applied in the direction of cams, components with teeth, engine components, etc., can solve problems such as new costs

Inactive Publication Date: 2009-09-16
GM GLOBAL TECH OPERATIONS LLC
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the outer surface of the shaft as a bearing surface would require tighter tolerances on the outer diameter of the outer shaft, and thus require additional machining operations, resulting in additional costs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Concentric camshaft with independent bearing surface for floating lobes
  • Concentric camshaft with independent bearing surface for floating lobes
  • Concentric camshaft with independent bearing surface for floating lobes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The following description is merely exemplary in nature and is not intended to limit the invention and its application or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

[0013] now refer to figure 1 , schematically illustrates an exemplary engine assembly 10 . The engine assembly 10 may include an engine 12 defining a plurality of cylinders 14 having pistons 16 disposed therein. The engine 12 may further include intake valves 18 , exhaust valves 20 and intake and exhaust valve lift mechanisms 22 , 24 for each cylinder 14 , as well as a camshaft 26 and a cam phaser 28 .

[0014] The intake valve lift mechanism 22 may include a pushrod 30 and a rocker arm 32 . The exhaust valve lift mechanism 24 may additionally include a pushrod 30 and a rocker arm 32 . Camshaft 26 may be supported by engine structure, such as an engine block. Pushrod 30 is engageable with camshaft 26 t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to concentric camshaft with independent bearing surface for floating lobes. Particularly relates to a camshaft may include a first shaft, a first lobe member fixed to the first shaft, a second lobe member fixed to the first shaft, and a third lobe member. The first lobe member may include a first lobe portion and a first bearing portion extending axially from the first lobe portion. The second lobe member may include a second lobe portion and a second bearing portion extending axially from the second lobe portion toward the first bearing portion. The third lobe member may include a first end that is rotatably supported on the first bearing portion and a second end that is rotatably supported on the second bearing portion.

Description

technical field [0001] This invention relates to engine camshaft assemblies, and more particularly to concentric camshaft assemblies. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Engines typically include camshafts to actuate intake and exhaust valves. Some camshafts are concentric camshafts that provide relative rotation between the intake and exhaust lobes (or lobes). The intake lobes may be fixed for rotation with the outer shaft and the exhaust lobes are rotatably supported on the shaft. Alternatively, the exhaust lobes may be fixed for rotation with the outer shaft on which the intake lobes are rotatably supported. In either arrangement, the lobes rotatably supported on the shaft may use the outer surface of the outer shaft as a bearing surface. Using the outer surface of the shaft as a bearing surface would require tighter tolerances on...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/047F01L1/26
CPCF01L1/022F01L1/053F01L2001/0535F01L2820/041F01L1/267F01L2001/0473F01L1/344F16H53/025Y10T29/49293Y10T74/2101Y10T74/2102
Inventor G·E·克莱弗R·K·埃尔尼克R·G·凯伍德
Owner GM GLOBAL TECH OPERATIONS LLC