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Adjusting system for camshafts of an internal combustion engine

A technology for regulating systems and internal combustion engines, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as cumbersome structure, troublesome control, and complexity, and achieve the effect of reducing frictional heat

Inactive Publication Date: 2011-09-21
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This type of servo motor constituted as a permanent magnet motor or as a separately excited DC motor is complex and requires cumbersome control
This construction is further cumbersome due to the additional required mechanically or electrically acting brakes fixed on the cylinder head

Method used

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  • Adjusting system for camshafts of an internal combustion engine
  • Adjusting system for camshafts of an internal combustion engine
  • Adjusting system for camshafts of an internal combustion engine

Examples

Experimental program
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Embodiment Construction

[0025] according to figure 1 The regulating system of the ® contains a superposition transmission constituted as a planetary transmission, which comprises: a hollow gear 1, which forms the driven element; a planetary carrier 2, which forms the driving element, which has a sprocket for A chain or toothed chain connects the sprocket to the crankshaft of the internal combustion engine; the planet gears 3 are rotatably mounted on a bearing shaft 23 ; and the sun gear 4 is mounted on a central shaft 5 as an adjusting element. A camshaft 21 in the cylinder head of the internal combustion engine is driven via the driven element 1 . For this purpose, the driven element 1 is connected in a rotationally fixed manner to the camshaft 21 by means of a screw connection.

[0026]The stationary component 6 of the internal combustion engine, which may be part of the cylinder head, has a counter friction surface 7 which cooperates with a friction lining carrier 8 provided with friction linings...

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PUM

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Abstract

An adjusting system for camshafts of an internal combustion engine with an emergency running function, comprising a superposition gearing (1, 2, 3, 4) having a drive input element (2) which is driven by a crankshaft of the internal combustion engine, having a drive output element (1) which drives a camshaft (21) of the internal combustion engine and having an actuating element (4) by means of which a relative rotation between the drive input element (2) and the drive output element (1) can be realized by means of a device (7, 8, 9, 10, 11) for imparting a braking torque, which is variable fornormal operation, to the actuating element (4), wherein in the event of failure of the device (7, 8, 9, 10, 11) and / or of the control thereof, an emergency running position of the camshaft (21) can be attained and held by braking or arresting the actuating element (4). According to the invention, said adjusting system is characterized in that a lining carrier (8) of the device (7, 8, 9, 10, 11) is arranged in an axially movable and rotationally fixed manner on a shaft (5) which bears the actuating element (4), in that the braking torque for normal operation can be varied by means of an electromagnet (11) which acts on the lining carrier (8) counter to the force of a spring (10) and in contactless fashion, which is stationary and which can be acted on with variable voltage, and in that, inthe event of failure of the voltage applied to the electromagnet (11) and / or of the control thereof, the lining carrier (8) can be pressed against a stationary counterpart friction surface (7, 24) bythe force of the spring (10), and the emergency running position can thereby be set.

Description

technical field [0001] An adjustment system for a camshaft of an internal combustion engine with an emergency run function, comprising a superposition transmission comprising: a drive element driven by the crankshaft of the internal combustion engine; a driven element driving the camshaft of the internal combustion engine; and an adjustment element, via the The adjustment element can cause relative rotation between the drive element and the driven element by means of a device for applying a braking torque variable for normal operation to the adjustment element, wherein between the device and The emergency operating position of the camshaft can be reached and maintained in the event of failure of its control or by braking or fixing the adjusting element. Background technique [0002] An adjustment system of this type is described in DE 10220687A1. Servomotors are used in such control systems, the stators of which are either fixedly connected to the cylinder head (in which th...

Claims

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Application Information

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IPC IPC(8): F01L1/352F01L1/344
CPCF01L2800/12F01L1/352F01L2001/3522F01L1/344
Inventor J·瓦利泽尔F·里希特E·施米茨
Owner ZF FRIEDRICHSHAFEN AG
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