DE102006014955A1 - Belt/pulley arrangement for use as e.g. variable auxiliary drive in motor vehicle, has wide V-belt with multiple support units, where each supporting unit is provided with slot at its side flanks for receiving traction mechanism carriers - Google Patents

Abstract

The arrangement has a wide V-belt (6) with two traction mechanism carriers (8, 10) and multiple support units (14), where each supporting unit is provided with a slot at its side flanks (16a, 16b) for receiving the traction mechanism carriers. The traction mechanism carriers have outer side flanks (8a, 10b) that project over the respective side flanks (16a, 16b) of the support units about a projecting length in such a manner that a contact takes place about the outer side flanks (8a, 10b) with engagement of the wide V-belt/belt pulleys (4).

Description

The The invention relates to a belt / disc arrangement with a wide V-belt, wherein the wide V-belt have a greatly increased transverse stiffness should, - according to the generic Features of claim 1.

With V-belts, a distinction is made between normal, narrow and wide V-belts. The difference between each type is the ratio of width to height. While with standard V-belts ( 2a ) the width / height ratio is about 1.6: 1 and narrow-belt ( 2 B ) is about 1.2: 1, reach wide V-belt ( 2c ) a width / height ratio of a maximum of 5: 1.

Wide V-belts are created for V-belt drives with stepless speed adjustment. The relatively large widths of this V-belt design allow for radial travel of the split-plate belt used in such control gears ( 2d . 2e ).

to Power or power transmission Belt / pulley and vice versa, the wide V-belt must have sufficient contact area to the discs. At the same time, there is a large transverse rigidity of the belt required. The fulfillment of these two requirements usually happens with the help of a relatively large Belt height. The resulting problem is, in particular, that at big belt height the for the desired running behavior needed Flexibility is not given.

In order to improve the relation of transverse rigidity / longitudinal flexibility, toothed wide V-belts are proposed, wherein the teeth for further increasing the transverse stiffness -. B. according to EP 0 222 637 - Can be reinforced with transverse inserts.

apart that the contribution of reinforcing inserts with additional Manufacturing effort is connected, has been shown in practice that the disk flanks of the relatively sharp, up to the belt surface excellent reinforcing inserts be scratched or even severely damaged when strongly engaged, which is a considerable one Reduction of serviceability and life means.

Though the transverse rigidity is increased; however, the longitudinal flexibility becomes not improved.

In contrast to conventional, toothed wide V-belts, which have a more or less flat-angled relief-like surface structure with a large remaining residual height of the solid material, according to DE 197 56 049 A1 the individual teeth "undercut" to an increased extent, ie, the individual teeth have more or less hollow undercuts, resulting in an overall further reduction in the effective (effective) thickness of the belt, without the available contact surface excessively reduced by the teeth becomes.

For the transmission higher performance Wide V-belt drives with stepless speed adjustment after to be desired: because of her Bends are deflected by wide V-belts for the transmission of larger power only conditionally suitable for use.

Task of invention

The The object of the invention is therefore to provide a belt / disc arrangement with a Wide V-belt for transmission great achievements or larger Torques, the wide V-belt with good longitudinal flexibility strong increased Should have transverse stiffness.

Solution and advantages

According to claim 1 is the belt / disc arrangement of a wide V-belt and built up at least two pulleys. At least one of the at least two pulleys have mutually adjustable flanks. The wide V-belt consists of two traction means carriers made of elastomeric material, in each of which a cord (cord) is integrated. These two Zugmittelträger are each taken up by slots, which are on both sides in a variety of stringed support elements are located. The outer flanks the Zugmittelträger each protrude so far the support element flanks addition, that in power transmission an engagement belt / pulley exclusively on the two outer Zugmittelträgerflanken (and not over the support element flanks) he follows.

With support elements increased V-belts are known as "hybrid V-belts".

hybrid V-belt are also used for stepless transmission of high power proposed. This is the quality of power transmission decisively from the chosen one Formation of the contact surface Belt / disc determined.

According to the EP 0 135 710 the power transmission takes place from the at least one tension member via a plurality of support elements ("blocks") lined up on the at least one tension member, and further: from the side flanks of the support elements the inner flanks of a driven pulley, or vice versa: from the inner flanks of a driving pulley on the side surfaces of support elements.

For the purpose of Force or power transmission of the at least one tension member on the supporting elements, the upper and / or the underside of the tension members is usually serrated or wavy formed, wherein the toothing or the ripple of at least a train carrier with correspondingly formed slots arranged in the support elements, into the train carriers are embedded, form-fitting engage.

• 1. Die Stützelementflanken und die Scheibenflanken weisen gleiche Neigungswinkel auf. Auf diese Weise ergibt sich eine große Auflagefläche Stützelemente/Scheibe. Da die Scheibenflanken jedoch nicht unendlich starr sind sondern sich lastabhängig mehr oder weniger stark auseinander spreizen, ist eine große Auflagefläche lediglich „theoretisch" vorhanden. Praktisch ergibt sich eine nur linienförmige Berührung zwischen Stützelement-Flanke und Scheiben-Flanke.
• 2. Die Stützelementflanken sind ballig (konvex) ausgebildet. In diesem Fall wird auf die Lastabhängigkeit des Scheibenflanken-Winkels Rücksicht genommen. Aber auch in diesem Fall ergibt sich lediglich eine nur linienförmige Berührung Stützelemente/Scheibe.

In order to ensure an optimal frictional force transmission from the support element flanks to the disk flanks, essentially two different concepts are currently proposed:

• 1. The support element edges and the disc edges have the same inclination angle. In this way, a large bearing surface support elements / disc results. However, since the disk flanks are not infinitely rigid but spread apart more or less depending on the load, a large contact surface is only "theoretically" available, resulting in a virtually linear contact between the support element flank and the disk flank.
• 2. The support element edges are crowned (convex). In this case, consideration is given to the load dependence of the wafer edge angle. But even in this case results in only a linear contact support elements / disc.

According to the invention the contact between belt and disc - as already mentioned above - exclusively on the Zugmittelträger (and not - like common with hybrid belts - over the Supporting elements). In contrast to those made of hard plastic or metal support elements exist the Zugmittelträger made of elastomeric material. This has the consequence that the Zugmittelträgerflanken can optimally cling to the respective disc edges. One certain yielding of the disc flanks under heavy load can offset by the flanks of the existing elastomeric material Zugmittelträger become. Also manufacturing tolerances with respect to the Zugmittelträgerflanken- and disc flank angles pose no problem because of the elastomeric material existing Zugmittelträger and not made of hard plastic Material existing support elements the frictional power transmission serve. Furthermore have the two elastomeric Zugmittelträgerflanken (compared to the plastic support element flanks in the hybrid V-belt) a much higher one Friction coefficient, which is in the transmission design mainly in the lower pulley spreading forces effect.

at made of die-cast aluminum or plastic by injection molding produced supporting elements can be largely dispensed with a post.

Around the longitudinal stability and the Longitudinal guide of the Hybrid belt according to the invention to optimize, successive support elements engage each other. Here are the support elements preferably designed such that the back of a support element represents the negative shape of the subsequent support element. Especially at V-shaped surface design becomes the respectively following support element centered on the previous one. An otherwise possible lateral instability is thus reliable suppressed.

The Zugstranglage the Zugmittelträger is mainly in the neutral fiber. In this way is the load on tension and pressure within the elastomeric composite least.

Compared with conventional Wide V-belt results in the invention with support elements equipped belt a considerable increase in the Transverse stiffness and a significant increase in the power transmission capacity and the lifetime. Because the support elements exclusively for increase The transverse stiffness provided can be based on a toothing of the Zugmittelträger with the support elements be waived. At the support elements plays the dimensional stability a minor role. On a post-processing (finish) can at the production of the support elements largely dispensed with.

Of the Belt drive according to the invention is particularly applicable in the industrial sector, where relatively large benefits or to transmit torques cost-effective are, as well as a variable accessory drive in the automotive sector applicable. As the belt drive according to the invention in the noise behavior essential better than the hybrid V-belt is where the periodic impact the support elements consistent noise generated, it can be sound-critical Applications are used.

drawings

in the following is the belt / disc arrangement according to the invention, in particular the relevant Wide V-belt, and other advantages of the invention with reference to a Exemplary embodiment Modifications closer described. It shows:

1 an inventive Rie men / disc arrangement in cross section;

2a -C show schematic representations of different V-belt types in each case in cross section, namely:

2a a standard V-belt,

2 B a narrow V-belt and

2c a wide V-belt.

2d and 2e show a wide V-belt / disc arrangement with split disc in different positions, also in each case in cross section. It shows:

3 a pair of traction means according to the in 1 and 5a illustrated embodiment, in cross section;

4 a support element according to the in 1 and 5a illustrated embodiment, viewed in the belt longitudinal direction;

6a . 6b and 6c three different embodiments of support elements, each in plan view;

7 four support elements arranged in series, in the stretched state of the belt, viewed from the side; and

8th a section of a Breitkeilriemens invention, in longitudinal section.

description

The cross sections of the known from the prior art V-belt types are in the 2a to 2c shown. The 2d and 2e show schematic diagrams of wide V-belt / disc arrangements, wherein the divided disc can be seen in different positions.

The sectional image ( 1 ) of a belt / disc arrangement 2 shows a split pulley 4 to which a wide V-belt according to the invention 6 is laid. Here are the thighs 4 ' . 4 '' the disc 4 , and thus the windshields 4a and 4b , arranged in a conventional manner variable in distance from one another. The wide V-belt 6 is made of two traction means carriers 8th . 10 built into each of which a tensile strand 12 is integrated. The Zugmittelträger 8th . 10 are with a number of support elements 14 strengthened. For this purpose, the support elements 14 both sides each have a slot 18a . 18b ( 4 ), in each of which a traction means carrier 8th respectively. 10 is admitted. The outer ones 8a . 10b the side flanks 8a . 8b ; 10a . 10b ( 3 ) of the traction means carrier 8th . 10 protrude over the respective side flank 16a respectively. 16b the support elements 14 out. The contact between wide V-belts 6 and pulley 4 takes place exclusively via the (outer) Zugmittelträgerflanken 8a . 10b ,

In 5a are the essential to the invention details of in 1 illustrated Breitkeilriemens 6 more clearly visible: The outer flanks 8a . 10b the Zugmittelträger 8th . 10 are wide and protrude so far over the respective slot 18a respectively. 18b the support elements 14 ( 4 ) (supernatant 20 ) that when engaging belt / disc contact only and over the entire height of the respective (outer) Zugmittelträgerflanke 8a . 10b takes place (contact surfaces 22a . 22b ). The supernatant 20 is chosen only so large that after reaching the required life of the wide V-belt still a safe distance is guaranteed and it at no time to a contact of the disc edges 4a . 4b with the support element 14 can come.

In the neutral fiber above the centerline is a cord each 12 in the Zugmittelträgern 8th . 10 integrated. Due to the asymmetry thus given, the elastomeric material becomes the traction agent carrier 8th . 10 in power transmission more stressed on pressure than on train. A detachment of the cords 12 from the elastomer composite of the respective Zugmittelträgers 8th respectively. 10 is thus reliably avoided.

According to 5b are the cross-sectional areas A of the Zugmittelträger 8th . 10 wedge-shaped. D. h .: The tops 8c . 10c the Zugmittelträger 8th . 10 are to the respective subpages 8d . 10d inclined. The contact surfaces 22a . 22b the Zugmittelträger 8th . 10 to the disc edges 4a . 4b is relatively large, while the inner flanks 8b . 10a the Zugmittelträger 8th . 10 are each formed relatively small. In this way, the thighs get 14 ' . 14 '' the support elements 14 each a broad and therefore stable base. In power transmission results in a firm wedging the traction means 8th . 10 in the support elements 14 ,

In the 5c shown Zugmittelträger 8th . 10 are also wedge-shaped and also have a longitudinal ribbing (longitudinal ribs 24 ). As a result, obtain the traction means 8th . 10 a reliable hold in the slots 18a . 18b the support elements, - even in the non-installed state of the Breitkeilriemens 6 , In addition, the give the Zugmittelträgerrippen 24 associated notches in the support element legs 14 ' . 14 '' each support surfaces for power transmission.

The 6a . 6b and 6c show support elements according to the invention 14 , each viewed from the top.

According to 6a are the support elements 14 each center with tongue and groove 26 Mistake. According to 6b are the support elements 14 each at least partially slightly wedge-shaped, whereby centering takes place when engaging.

In the 6c illustrated support elements 14 are similar to those of 6a , According to 6c is also a tongue and groove system 26 suggested, in which case the springs are formed in the manner of nubs hemispherical or semi-cylindrical. The corresponding to these springs grooves, each on the backs of the support elements 14 are, have corresponding hollow shapes.

From the side views ( 7 and 8th ) it can be seen that the support elements 14 are formed tapered to smaller disc radii R out. In this way is a wrap of the disc 4 even with smaller effective disc radii R possible.

2

Drive arrangement Belt / pulley arrangement

4

Pulley (n)

4 ', 4' '

leg the pulley

4a, 4b

Pulley flanks, disc edges

6

Speed belts

8th, 10

Zugmittelträger

8a, 8b

Side edges of the Zugmittelträgers 8th

10a, 10b

Side edges of the Zugmittelträgers 10

8a, 10b

outer Zugmittelträgerflanken

8c, 10c

Topsides "of the Zugmittelträger 8th . 10

8d, 10d

"Undersides" of the traction means 8th . 10

12

tensile member, Cord

14

Supporting member (s), Block (blocks)

14 ', 14' '

Legs of the support elements 14

14-I, 14-II, ...

first, second, ... support element 14

16a, 16b

side flanks the support elements, support element edges

18a, 18b

Slot, Support member slot

20

Projection of the outer Zugmittelträgerflanken 8a . 10b over the respective support element edges 16a . 16b

22a, 22b

Contact surfaces: outer Zugmittelträgerflanken 8a . 10b / Pulley flanks 4a . 4b

24

Longitudinal ribs ribs

26

groove or spring

A

Zugmittelträgerquerschnittsfläche

R

(more effective) wheel radius

Claims (9)

Belt / disc arrangement ( 2 ), 1.1 in particular for use in the industrial sector and as a variable accessory drive in a motor vehicle, 1.2 with two pulleys ( 4 ), 1.2.1 where at least one of the two pulleys ( 4 ) mutually adjustable flanks ( 4a . 4b ) and 1.3 with a wide V-belt ( 6 ), 1.3.1 consisting of two elastomeric material and one tie-rod each ( 12 ) reinforced traction devices ( 8th . 10 ) and a plurality of support elements ( 14 ) is constructed, which at its two side edges ( 16a . 16b ) each with a, a row of slots forming slot ( 18a . 18b ) for receiving the traction means carrier ( 8th . 10 ), 1.3.1.1 the respective outer side edges ( 8a . 10b ) the traction means carrier ( 8th . 10 ) over the respective side edges ( 16a . 16b ) of the supporting elements ( 14 ) to a supernatant ( 20 ) protrude so that upon engagement of wide V-belts ( 4 ) / Pulley ( 6 ) a contact exclusively via the outer Zugmittelträgerflanken ( 8a . 10b ) he follows. Belt / disc arrangement according to claim 1, characterized in that the support elements ( 14 ) are formed such that at least a partial surface of the back ( 14 '' ) of a support element ( 14-I ) the negative mold of at least one associated partial surface of the front side ( 14 ' ) of the subsequent support element ( 14-II ). Belt / disc arrangement according to claim 1 or 2, characterized in that the cross-sectional areas (A) of the two traction means carrier ( 8th . 10 ) are each formed asymmetrically. Belt / disc arrangement according to claim 3, characterized in that the side surfaces ( 8a . 8b respectively. 10a . 10b ) the traction means carrier ( 8th . 10 ) are each inclined to each other. Belt / disc arrangement according to claim 3 or 4, characterized in that the traction means upper side ( 8c . 10c ) relative to the respective Zugmittelträger-bottom ( 8d . 10d ) is inclined. Belt / disc arrangement according to one of claims 1 to 5, characterized in that the two traction means carrier ( 8th . 10 ) each have a tensile strand ( 12 ) which is arranged towards a larger disk radius (R). Belt / disc arrangement according to one of claims 1 to 6, characterized in that the upper ( 8c . 10c ) and / or the underside ( 8d . 10d ) the tension member ( 8th . 10 ) with longitudinal ribs ( 24 ) is provided (are), wherein the associated contact surfaces of the Support element slots ( 18a . 18b ) have a corresponding structure. Belt / disc arrangement according to one of claims 1 to 7, characterized in that the support elements ( 14 ) made of aluminum by die casting or plastic injection molding are mass produced. Belt / disc arrangement according to one of claims 1 to 8 for torque transmission in a stationary Investment.