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Camshaft for combustion engine

A technology of camshafts and internal combustion engines, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as camshaft installation and placement restrictions, and achieve the effect of avoiding bending vibration and flexible control

Active Publication Date: 2019-06-28
乌伟·艾森拜斯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Furthermore, since the control shaft 53 is arranged on the axis of rotation, at least one shaft end of the camshaft must be accessible, which leads to restrictions on the installation and placement of the camshaft

Method used

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  • Camshaft for combustion engine
  • Camshaft for combustion engine
  • Camshaft for combustion engine

Examples

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Embodiment Construction

[0026] figure 1 and figure 2 A valve train for an exhaust valve 70 of an internal combustion engine with a camshaft 10 according to an exemplary embodiment of the invention is shown. Camshaft 10 includes cams 11 arranged to actuate exhaust valves 70 . The camshaft 10 is rotatable about its axis. For this purpose, the camshaft 10 is supported on the cylinder head via bearings 8a, 8b, thus on both sides via the bearings 8a, 8b. Hence, it is overhead camshaft. The camshaft 10 also includes a centrifugal element 21 , which is described in more detail below with respect to FIGS. 3 and 4 .

[0027] The mounts 8a, 8b on both sides allow an advantageous power transmission between the cam and the valve, since undesired bending vibrations of the camshaft are avoided. Mountings on both sides also allow flexible control of the valve train; according to a preferred aspect, the transmission gear or chain drive sprocket connected to the crankshaft of the internal combustion engine is ...

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PUM

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Abstract

The invention relates to a camshaft (10), which is mounted at both ends, for an outlet valve (70) of a combustion engine, said camshaft having a cam (11) and a release mechanism (20). The cam (11) defines a cam contour (16) for the cyclical actuation of the outlet valve through rotation of the camshaft, and comprises a cam body (12) and a cam contour element (40). The cam contour element (40) canbe moved relative to the cam body (12) into a first cam contour position and into a second cam contour position in such a way that the cam contour (16) has a first cam contour shape when the cam contour element (40) is in the first cam contour position, and has a second cam contour shape, which differs from the first cam contour shape, when the cam contour element is in the second cam contour position. The release mechanism (20) for the cam contour element (40) is configured to hold the cam contour element in the first cam contour position at a first, lower rotational speed of the camshaft, and to hold the cam contour element in the second cam contour position at a second, higher rotational speed.

Description

technical field [0001] One aspect of the invention relates to a camshaft for exhaust valves of an internal combustion engine. According to one aspect, the camshaft has a movable cam profile element, by means of which a speed-dependent cam profile shape is obtained. Background technique [0002] Valve trains in which the valve lifts of the intake and exhaust valves are generated with the aid of a camshaft with a fixed stroke height and stroke duration are generally used in internal combustion engines. However, such valve trains have disadvantages with regard to optimal adaptation to the different load ranges of the internal combustion engine. Furthermore, once the engine is cranked during the starting phase, the camshaft actuates the valve train; however, the energy used to compress the gases in the combustion chamber must be applied by starting the engine, which can lead to disadvantages during starting. [0003] To accommodate such demands, there are many valve trains tha...

Claims

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Application Information

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IPC IPC(8): F01L13/08F01L1/047
CPCF01L1/047F01L13/085
Inventor 乌伟·艾森拜斯
Owner 乌伟·艾森拜斯