DE102007024941A1 - Hybrid fan belt has multiple support elements arranged on tie beam, where tie beam width has elongation strain by formation of traction rope - Google Patents

Abstract

The hybrid fan belt (1) has multiple support elements arranged on a tie beam (4). A tie beam width has an elongation strain by formation of a traction rope (2) according to one or more criteria, namely material, rigidity, breadth oriented number, thick or diameter, assembly of the tie beam. The longitudinal rigidity of the tie beam is enlarged in the tie beam by the thickness of the traction ropes.

Description

The The invention relates to a hybrid V-belt of at least one tension member with a plurality of support elements arranged thereon.

such Hybrid V-belts are known per se and are available in continuously variable Continuously variable transmission (CVT) used. The Zugträger are usually formed from tensile strands, which typically consist of glass fibers, aramid or steel cords. The tensile cords are in elastomeric material, for example Rubber, mostly completely embedded. The support elements are non-positive or positive on these tension members arranged and direct the forces of conical disks of the CVT transmitted, in the tension member.

Hybrid V-belts of this type are for example in the DE 100 57 381 A1 , of the DE 10 2004 039 145 A1 or the WO 2005/090 823 A1 disclosed.

The Image fidelity from primary to secondary speed The CVT is essentially based on the characteristics of the tension members dependent. Especially with translation changes or accelerations are becoming increasingly demanding the picture loyalty posed.

The Image fidelity is very much dependent on the longitudinal stiffness of the tensile strand determined by a strain-related elasticity coefficient (EA value) can be expressed. This strain-related elasticity coefficient is determined in which the tensile strand with a specific force is elongated and the force by the thereby measured percentage elongation divided. The higher the value, the stiffer it is the tension cord. This calculation takes into account the tensile-strand materials at least partially force- or strain-dependent elasticity modules exhibit. With the strain-related elasticity coefficient a comparison with metallic materials is possible.

Of the Invention is the object of a hybrid V-belt of at the beginning of the article, which is particularly high Image fidelity from primary to secondary speed of CVT.

• – Werkstoff
• – Festigkeit
• – breitenbezogene Anzahl
• – Dicke oder Durchmesser
• – Aufbau

der Zugträger einen dehnungsbezogenen Elastizitätsbeiwert zwischen 10 kN und 50 kN pro mm Zugträgerbreite aufweist.This object is achieved in that by forming the tension cords according to one or more of the following criteria, namely

• - Material
• - Strength
• - width-related number
• - thickness or diameter
• - Construction

the tension member has a stretch-related elasticity coefficient between 10 kN and 50 kN per mm of tensile member width.

at according to selected longitudinal stiffness of the Zugträger is the force-dependent extension the tension member is so low that a good to very good imaging fidelity the speeds from arrival to driven side is given.

In a development of the invention is the longitudinal stiffness the tension member by the density of the tension cords in Zugträger enlarged.

A very high density, d. H. many tensile cords per unit width, cause a high rigidity of the tension members in the pulling direction.

In a development of the invention is the longitudinal stiffness the tension member by the use of differently thick cords can be enlarged as tension cords.

thicker Tensile cords have a high elongation-related elasticity coefficient on.

In a development of the invention is the longitudinal stiffness the tension member by the alternate use of one S- and a Z-impact cords as tensile cords enlargeable.

twisted Cords tend to turn up under load and thereby to lengthen. The use of differently twisted cords as pull cords reduces the possibility of Tensioner to turn up, as the direction of rotation of the cords is opposite.

Based The drawing will be closer to an example of the invention explained.

The single figure shows a cross section through a hybrid V-belt according to the invention 1 , tension cords 2 and an elastomeric material 3 form a tension member 4 , where the tension cords 2 from the elastomeric material 3 are enclosed.

On the tension member are supporting body 5 postponed. The supporting bodies 5 lie in the direction of the tension members one behind the other, so that here only one support body 5 is visible. The supporting bodies 5 have a direction transverse to the direction of the tension member 4 running slot 6 on, with the support body 5 are designed so that the tension member 4 approximately centrally to the support bodies 5 in the slot 6 is arranged. The supporting bodies 5 grab with two tooth-like, inside the slot 6 protruding projections 7 in corresponding, transversely to the longitudinal direction of the tension member 4 running and not visible grooves of the tension member 4 one. Driving or driven forces, by not shown here wedge discs on the support body 5 act over the tabs 7 and the Grooves on the tension member 4 transferable.

To increase the longitudinal stiffness are the tensile cords 2 made of high-strength aramid fibers, which are across the width of the tension member 4 are arranged so that the densest possible sequence of tension cords 2 is reached.

Here are the tensile cords 2 To avoid premature wear just through a thin layer 8th made of elastomeric material 3 separated from each other, allowing direct contact of the fibers of the tensile cords 2 not possible. The densest possible sequence of tension cords 2 and the use of high-strength aramid cause a particularly high longitudinal stiffness of the tension member 4 ,

1

hybrid V-belt

2

tension cords

3

elastomeric material

4

tension members

5

support body

6

Slot the support body 5

7

Tabs in the slot 6

8th

Layer between the tensile cords 2

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 10057381 A1 [0003]
• DE 102004039145 A1 [0003]
• WO 2005/090823 A1 [0003]

Claims (4)

Hybrid V-belt ( 1 ) of at least one tension member ( 4 ) with a plurality of supporting elements arranged thereon, characterized in that by forming the tension cords according to one or more of the following criteria, namely - material - strength - width-related number - thickness or diameter - structure of the tension members ( 4 ) has a strain-related elasticity coefficient of between 10 kN and 50 kN per mm tensile beam width. Hybrid V-belt ( 1 ) according to claim 1, characterized in that the longitudinal stiffness of the tension members by the density of the tension cords ( 2 ) in the tension member ( 4 ) is enlargeable. Hybrid V-belt ( 1 ) according to claim 1 or 2, characterized in that the longitudinal rigidity of the tension members ( 4 ) by the use of different thickness cords as tension cords ( 2 ) is enlargeable. Hybrid V-belt ( 1 ) according to claim 1, 2 or 3, characterized in that the longitudinal stiffness of the tension members ( 4 ) by the alternating use of S and Z impact cords as tension cords ( 2 ) is enlargeable.