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Camshafts, especially for motor vehicle engines

A camshaft and cam technology, applied in the direction of machines/engines, engine components, transmissions, etc., can solve problems such as increased failure risk and increased manufacturing costs, and achieve the effect of simple and cheap manufacturing

Active Publication Date: 2017-06-30
THYSSENKRUPP PRESTA TECCENTER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage arises that the axial support is provided by remote elements separated from one another, so that, in addition to increased manufacturing costs, there is also an increased risk of failure

Method used

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  • Camshafts, especially for motor vehicle engines
  • Camshafts, especially for motor vehicle engines
  • Camshafts, especially for motor vehicle engines

Examples

Experimental program
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Embodiment Construction

[0045] The invention relates to an adjustable camshaft, which according to the basic structure comprises a first shaft and a second shaft, which form a hollow outer shaft 1 and a coaxially arranged in the hollow An inner shaft 2 in the outer shaft 1 and mounted rotatably relative to the outer shaft. As can be seen from FIG. 1 a , the first cam 3 a is fixedly arranged on the outer shaft 1 , and the second cam 3 b is rotatably arranged on the outer shaft 1 and fixed to the inner shaft 2 with suitable fastening means 4 , in particular pins. Figure 1a shows one end of such a camshaft.

[0046] The invention is concerned with the axial mounting of the outer shaft 1 and the inner shaft 2 rotatably mounted in the outer shaft. During the axial support, care should be taken that there should be no play between the inner shaft 2 and the outer shaft 1 in the axial direction, wherein a sliding, jam-free support should however be achieved.

[0047] For this purpose, according to the inve...

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PUM

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Abstract

The invention relates to a camshaft, in particular for a motor vehicle engine, comprising: a first shaft and a second shaft forming a hollow outer shaft (1) and a an inner shaft (2) coaxially disposed in the outer shaft (1) and rotatable relative to the outer shaft (1); a first cam (3a) non-rotatably disposed on the outer shaft (1); and a rotatable The second cam (3b) is arranged on the outer shaft (1) and fixed on the inner shaft (2). According to the invention it is provided that the first shaft and the second shaft are mutually supported in the axial direction (x) via a form-locking formation (5), wherein the first shaft is form-fitting as viewed in the axial direction (x). The part (5) has a first contact surface (6a) on one side and a second contact surface (6b) on the other side of the form-locking forming part (5), so that via the form-locking forming part (5) The second shaft is rotatably supported.

Description

technical field [0001] The invention relates to a camshaft, in particular for a motor vehicle engine, comprising: a first shaft and a second shaft forming a hollow outer shaft and a coaxial an inner shaft arranged in the outer shaft and rotatable relative to the outer shaft; a first cam non-rotatably arranged on the outer shaft and a second cam rotatably arranged on the outer shaft and fixed on the inner shaft. Within the scope of the invention, depending on the design of the first shaft, the first shaft can be an outer shaft or an inner shaft, wherein the second shaft is correspondingly an inner shaft or an outer shaft. Background technique [0002] A variable control of the valves of the internal combustion engine can be achieved by shifting the first cam relative to the second cam. Thus, for example, the ratio of the intake time and the exhaust time can be varied as a function of load and rotational speed, wherein the intake valve on the one hand and the exhaust valve on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L1/047F01L1/34F01L1/344
CPCF01L1/047F01L1/34F01L1/34413F01L2001/0473Y10T74/2101F16H25/08
Inventor M·昆茨B·曼恩M·梅尔泽J·莫伊泽尔
Owner THYSSENKRUPP PRESTA TECCENTER AG