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Camshaft unit

A technology of camshafts and camshaft adjusters, which is applied to engine components, machines/engines, mechanical equipment, etc., and can solve problems such as manufacturing costs

Inactive Publication Date: 2014-12-24
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The arrangement is also complex in terms of production due to the large number of components to be installed

Method used

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Examples

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Embodiment Construction

[0026] figure 1 A first camshaft unit 1 is shown, which has a first camshaft 2 , a second camshaft 3 arranged concentrically to the first camshaft 2 , and a connecting element 4 . The connecting element 4 is connected to the first camshaft 2 via a first toothing 16 and to the second camshaft via a second toothing 17 . One of the toothing pairs 6 , 16 and 7 , 17 is designed as a helical toothing and the other pair is designed as a straight toothing.

[0027] The connecting element 4 is designed as a stepped sleeve which has two different inner radii and surrounds the two camshafts 2 , 3 radially on the outside. The inner radius difference corresponds to the ring diameter of the outer camshaft which is now formed by the first camshaft 2 . The two camshafts 2 , 3 extend axially to different extents into the inner cavity 14 of the connecting element 4 . The toothing 16 , 17 of the connecting element 4 meshes with the mating toothing 6 , 7 of the camshaft 2 , 3 . All three comp...

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Abstract

Camshaft unit (1) comprising a first camshaft (2), which is phase-settable with respect to a crankshaft, a second camshaft (3), which is disposed concentric to the first camshaft (2) and is always phase-true to the crankshaft, a camshaft adjuster (5) with which the first camshaft (2) is phase-settable with respect to the crankshaft, a connecting member (4), which is displaceable in the axial direction of the camshafts (2, 3) and has first toothing (16), wherein the first toothing (16) meshes with counter-toothing (6) on the first camshaft (2), and an adjusting drive (9) by means of which a connecting member (4) can be displaced axially, wherein by means of the axial advance, a relative rotation of the first camshaft (2) with respect to the connecting member (4) takes place.

Description

technical field [0001] The invention relates to a camshaft unit having two camshafts arranged concentrically with one another and a camshaft adjuster. Background technique [0002] A camshaft unit with camshafts arranged concentrically with one another, also called a double camshaft, has a first camshaft which extends at least partially as an inner camshaft into a second camshaft as an outer camshaft . Such a camshaft unit for actuating a gas exchange valve of an internal combustion engine is known, for example, from EP 0 582 846 B1 or from US 6,725,817. The camshaft unit has a respective camshaft adjuster for each camshaft, which enables a phase shift relative to the crankshaft. The camshaft adjusters of the camshaft units are each operated hydraulically. On the one hand, such hydraulic drives operate relatively unresponsively and have temperature-dependent control values ​​due to the temperature-dependent viscosity of the oil. Furthermore, larger adjustment angles are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/344
CPCF01L1/34413F01L1/34406F01L2001/34486
Inventor 延斯·舍费尔塞巴斯蒂安·茨瓦尔
Owner SCHAEFFLER TECH AG & CO KG
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