DE102016213747A1 - Zugmittelspanner with operating state dependent variable-length arm Endloszugmitteltrieb and method for tensioning a continuous draw - Google Patents

Abstract

The invention relates to a traction mechanism tensioner (1) for an endless traction drive (2), comprising a tensioning roller (3) which is designed to come into contact with an endless traction means (4), said tensioning roller (3) being rotatable on a tensioning roller attachment portion (7). an arm (6) is mounted, wherein the arm (6) on a tensioning roller remote mounting area (9) is fixedly mounted, between the mounting area (9) and the Spannrollenanbringbereich (7) at least one operationally changeable in position hinge (14) so is involved, that a change in the length of the arm (6) in response to operating conditions of the endless traction mechanism drive (2) can be hervorufbar. The invention also relates to a continuous traction drive (2) with an endless traction means (1) on which a tensioning roller (3) of a traction mechanism tensioner (1) of the type according to the invention is applied. The invention also relates to a method for tensioning a continuous drawing means (4) in which a traction mechanism tensioner (1) of the type according to the invention is changed in length as a function of the respective operating condition.

Description

The invention relates to a Zugmittelspanner for a endless traction drive, with a tensioning pulley, which comes to exciting contact with an endless traction means, such as a belt or a chain is designed / prepared, wherein the tensioning roller is rotatably mounted on a pulley attachment region of an arm, wherein the arm a clamping roller remote fastening area is motor fixed attachable.

From the state of the art, about the DE 10 2004 020 457 A1 is known an electromechanical or electromagnetic belt tensioner, and a method for adjusting a belt tension. In particular, that earlier patent application discloses a belt tensioner for an internal combustion engine with a toothed belt between a crankshaft and a camshaft and / or a sub-belt for driving engine attachments with an electromechanical actuator for acting on the belt, with a force measuring device for measuring the belt tension and with a control device is connected to the electromechanical actuator and the force measuring device and which is designed so that the belt tension in response to a measured belt tension, from an engine speed and engine speed-dependent parameters is adjustable to a predetermined value. Also, there is disclosed a method for adjusting a belt tension in an internal combustion engine.

Such and similar Zugmittelspanner be used in secondary drives and main drives, especially in "front end accessory drive / FEAD" or "primary drive / PD". Such Zugmittelspanner be used to change the tension mean tension in Endloszugmittel depending on the internal combustion engine operating state. Thus, the tension in the endless traction means is adjusted as a function of the rotational / rotational speed of the traction means. At idle speeds / relatively load-free operation, the Zugmittelschwingungen / Zugmitteloszillation are relatively high, as well as the Zugmittelamplitude. In this operating state, a higher clamping force is required than at high rotational speeds of the traction device / high-speed operation of the internal combustion engine. Especially in the former case, namely, a high voltage is beneficial to reduce vibrations and vibrations.

It is the object of the present invention to enable a situation-dependent adjustability of the traction device tension while avoiding or at least alleviating the disadvantages known from the prior art. In particular, a cost-effective solution is to be made available, which is robust and easy to assemble.

This object is achieved in a generic Zugmittelspanner according to the invention that between the mounting portion and the Spannrollenanbringbereich at least one operationally changeable in its position joint is so incorporated / integrated that a change in the length of the arm, in particular between the mounting portion and the Spannrollenanbringbereich, depending from the respective operating conditions of Endloszugmitteltriebes, hervorufbar is.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

So it is advantageous if an actuator on the arm attacks on both sides of the joint. Of course, several actuators can be used. But an advantage is an actuator per joint. The structure can then be kept compact.

In order to achieve a good controllability / controllability, it is advantageous if the actuator is designed as an electric, electromagnetic, hydraulic or pneumatic actuator and / or comprises a spring-damper combination.

It is expedient for the actuator to have an effective axis which is aligned substantially parallel or transversely, approximately perpendicularly, to an imaginary connecting straight line through the pivot point of the tensioning roller and the center of the fastening area, which is advantageously present in the tensioning roller fastening area.

Further, it is advantageous if the joint is formed as a pivot between two mutually tiltable lever-like arm portions or the arm and the joint forms a double scissors-like configuration. Especially in the double-scissor-type configuration, a robust embodiment known from the completely different area of the jack can be realized.

If a stop / stop is installed so that an angle when adjusting the arm sections to each other clamped between the longitudinal axis of the arm sections is limited, a maximum usable operating range can not be exceeded.

In order to use as many identical parts, it is advantageous if all arm sections have the same length and / or width.

It has proven to be advantageous if the stopper is designed as a separate component from the actuator.

The invention also relates to a continuous traction drive with an endless traction means, such as a toothed belt or a chain, on which a tensioning roller of a Zugmittelspanners of the type according to the invention is applied.

The invention also relates to a method for tensioning a continuous drawing means, in which a Zugmittelspanner of the type according to the invention in dependence on the respective operating state in its length changed, for example, regulated or controlled.

An electromagnetic actuator allows two positions, namely a retracted position and an extended position, or a retracted and an extended position. Between these two extreme positions but also intermediate positions are possible. If the distance between the mounting area and the tensioner roller attachment area is minimal, ie as small as possible, the usual operating state is assumed. In this case, an angle smaller than approximately 180 ° and preferably greater than approximately 90 ° exists between the two arm portions of the arm. An angle of about 160 ° has proven to be particularly advantageous. If the two lever-like arm sections are aligned in such a way that there is almost an approximately 180 ° angle between them about the rotary joint, the tension in the endless traction means is maximally increased. Especially in start / stop phases this is an advantage.

In a double-scissor-type embodiment of the arms, in the presence of at least four, better six joints, a similar length offset between the tension roller mounting portion and the mounting portion is adjustable. Contact forces of about 50 N are preferred. Just then an electromagnetic actuator can be used meaningfully.

The invention will be explained in more detail with the aid of a drawing. Two embodiments are shown. Show it:

1 a schematic structure of a Zugmittelspanners a first embodiment of the side, and

2 a second embodiment in a for 1 comparable presentation.

The figures are merely schematic in nature and are merely for the understanding of the invention. The same elements are provided with the same reference numerals. Features of the individual embodiments can be interchanged.

In the 1 is a first embodiment of a Zugmittelspanners invention 1 shown. He is in an only indicated endless traction drive 2 used.

There is a tension roller 3 with a continuous draw 4 in connection. The tension roller 3 is exciting as a belt 5 trained continuous draw 4 at. The belt 5 is designed in the manner of a toothed belt. The tension roller 3 is rotatable on one arm 6 appropriate. It is at a first end of the arm 6 a tension pulley attachment area near the idler pulley 7 available. Through the tension roller attachment area 7 goes an axis of rotation 8th , The tension roller 3 can be about the rotation axis 8th rotate. At the other end of the arm 6 namely, in a tensioning roller remote fastening area 9 is the arm 6 with the aid of a rotary locking mechanism 10 appropriate. In the attachment area 9 is a pivot axis 11 present to the arm 6 can swing.

The arm 6 has two arm sections 12 and 13 on, between which a joint 14 with a rotation axis 15 is arranged. From an arm section 13 protrudes a stopper / stop 16 from.

An actuator / actuator 17 is with both arm sections 12 and 13 connected.

Depending on the extension state of the actuator 17 the angle ABC changes. The maximum angle ABC is through the stopper 16 limited. The angle can therefore be varied between 180 ° and 90 °, for example by about 160 °.

In the 2 a second embodiment is shown, but in which the configuration of the arm 6 with its multitude of arm sections 12 and 13 and its multitude of joints 14 are arranged or combined to form a double scissors-type configuration.

Drive the two arm sections 12 when contracting the actuator 17 towards each other, the Zugmittelspanner lowers 1 so the tensioner 3 from the attachment area 9 in the direction of the arrow 18 , on the endless traction device 4 zufährt. However, there is no extra stopper here 16 available, but it is installable.

LIST OF REFERENCE NUMBERS

1

 Zugmittelspanner

2

 Endloszugmitteltrieb

3

 idler

4

 endless traction

5

 belt

6

 poor

7

 Spannrollenanbringbereich

8th

 axis of rotation

9

 fastening area

10

 Rotary locking mechanism

11

 swivel axis

12

 arm

13

 arm

14

 joint

15

 axis of rotation

16

 Stopper / stop

17

 actuator

18

 arrow

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102004020457 A1 [0002]

Claims (10)

Traction device tensioner ( 1 ) for a continuous traction drive ( 2 ), with a tension roller ( 3 ) which come into exciting contact with an endless draw means ( 4 ), wherein the tension roller ( 3 ) rotatably on a tension roller attachment area ( 7 ) of an arm ( 6 ), the arm ( 6 ) on a tensioning roll remote fastening area ( 9 ) fixed to the engine, characterized in that between the mounting area ( 9 ) and the tension roller attachment area ( 7 ) at least one operationally in its position variable joint ( 14 ) is integrated so that a change in the length of the arm ( 6 ) as a function of operating conditions of the endless traction drive ( 2 ) can be evoked. Traction device tensioner ( 1 ) according to claim 1, characterized in that on both sides of the joint ( 14 ) an actor ( 17 ) on the arm ( 6 ) attacks. Traction device tensioner ( 1 ) according to claim 2, characterized in that the actuator ( 17 ) is designed as an electrical, electromagnetic, hydraulic or pneumatic actuator and / or comprises a spring-damper combination. Traction device tensioner ( 1 ) according to claim 2 or 3, characterized in that the actuator ( 17 ) has an axis which is substantially parallel or transverse to an imaginary connecting line through the pivot point of the tensioning roller ( 3 ) and the center of the fortification area ( 9 ) is aligned. Traction device tensioner ( 1 ) according to one of claims 1 to 4, characterized in that the joint ( 14 ) as a hinge between two mutually tiltable lever-like arm portions ( 12 . 13 ) or the arm ( 6 ) and the joint ( 14 ) forms a double-scissors-like configuration. Traction device tensioner ( 1 ) according to claim 5, characterized in that a stopper ( 16 ) is installed so that an angle (ABC) when adjusting the arm sections ( 12 . 13 ) are clamped to one another between the longitudinal axes of the arm sections ( 12 . 13 ) is limited. Traction device tensioner ( 1 ) according to claim 5 or 6, characterized in that all arm sections ( 12 . 13 ) have the same length and / or width. Traction device tensioner ( 1 ) according to claim 6 or 7, characterized in that the stopper ( 16 ) as one from the actor ( 17 ) is formed separate component. Continuous traction drive ( 2 ) with an endless draw agent ( 4 ), on which a tension roller ( 3 ) of a Zugmittelspanners ( 1 ) according to one of claims 1 to 8. Method for tensioning a continuous drawing agent ( 4 ), in which a Zugmittelspanner ( 1 ) is changed according to one of claims 1 to 8, depending on the respective operating condition in its length.

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