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Valve train for gas exchange valves of an internal combustion engine having double-supported cam carriers

A technology of valve mechanism and support, applied in the direction of engine components, machines/engines, mechanical equipment, etc.

Active Publication Date: 2011-07-20
AUDI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the parallel orientation of all bores also has the disadvantage that the reaction forces exerted by the helical compression springs on the base camshaft all have the same direction, so that the base camshaft is supported on one side by the cam bearing and bends in this direction ( deflection)

Method used

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  • Valve train for gas exchange valves of an internal combustion engine having double-supported cam carriers
  • Valve train for gas exchange valves of an internal combustion engine having double-supported cam carriers
  • Valve train for gas exchange valves of an internal combustion engine having double-supported cam carriers

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Embodiment Construction

[0018] In the valve train 1 of the paired intake valves 2 for four cylinders of an in-line engine, which is only partially shown in the drawing, the strokes and opening times of the two intake valves 2 per cylinder can be is regulated.

[0019] To this end, the valve train 1 includes a basic camshaft 3 rotatably supported; four cam bearings 4 mounted on the basic camshaft 3 in such a way that they cannot rotate relative to each other but can move axially, figure 1 One of the cam bearings 4 is shown enlarged in longitudinal section; and two actuators (actuators) 5 are used to move each cam bearing 4 between two defined axial displacement positions to move between.

[0020] The cam bearings 4 each have on their outer circumference two cam pairs 6 arranged axially at a distance from one another, wherein each cam pair 6 comprises two cams 7 , 8 . Such as figure 1 As shown most clearly in FIGS. 3 and 3 , each of the two cam pairs 6 interacts with a roller 9 of a pivotably mounte...

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Abstract

The invention relates to a valve train (1) for gas exchange valves (2) of an internal combustion engine, having a base camshaft (3), a plurality of cam carriers (4) arranged on the base camshaft (3) in a rotationally fixed and axially displaceable way, and locking devices (24) for retaining the cam carriers (4) in defined displacement positions along the base camshaft (3). The locking devices (24) each comprise a pressing element (26), which is inserted into a recess (25) of the base camshaft (3) and pressed in the radial direction of the base camshaft (3) against an opposing inner circumferential section of the cam carrier (4). In order to counteract noise development in the valve train, according to a first variant of the invention, a further pressing element (31) is provided at an axial distance to the pressing element (26) and is pressed against an opposing inner circumferential section (33) of the cam carrier (4). According to a second alternative or additional variant scheme of the invention, the pressing elements (26, 31) of different cam carriers (4) are offset from each other in the circumferential direction of the base camshaft (3).

Description

technical field [0001] The invention relates to a valve train for gas exchange valves (intake and exhaust valves) of an internal combustion engine according to the preambles of claims 1 and 12 . Background technique [0002] In order to improve the thermal dynamics of internal combustion engines, valve trains are known which can control the working gap / working cycle in order to vary the opening times or strokes of the gas exchange valves, for example as a function of rotational speed. [0003] From the applicant's patent document DE 10 2004 011 586 A1 a valve train of the type mentioned in the preamble is known, in which on a base camshaft equipped with external toothing a relatively non-rotatable but axially displaceable A plurality of cam bearings having internal toothing complementary (to the external toothing) are guided in a manner. In order to actuate the two gas exchange valves of the cylinder, two sets of cam profiles arranged at an axial distance from each other ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/053F01L13/00
CPCF01L1/053F01L2013/0052F01L13/0036
Inventor M・哈特利布M・埃尔贝尔R・波伊达A・埃瓦尔德
Owner AUDI AG
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