DE10354701A1 - Stepless drive variator push link band end play measuremet procedure tightens band and presses test cone with measuring scale into it - Google Patents

Abstract

A stepless drive variator push link band (1 ) end play measurement procedure tightens the band and presses a test cone (4) into it with a defined force so that the existing play can be calculated by reading the distance that the cone enters the band on a scale (5) opposite the side in which the link knobs (2) are inserted.

Description

The The present invention relates to a method of measuring the endgame with push belt bands a variator of a continuously variable transmission according to the preamble of the claim 1.

One continuously variable transmission is usually et al a starting unit, a forward / reverse drive unit, an intermediate shaft, a differential, hydraulic and electronic control devices as well as a variator.

Of the Variator according to the prior art comprises a primary and a Secondary disc too Primary- and secondary side called, with both discs from paired cone pulleys are formed. Furthermore, a variator with a torque-transmitting Provided wrap element that between the two cone pulley pairs circulates. In such a transmission, the current ratio is the running radius of the wrapping element, which in turn defines a function the axial position of the conical disks is.

When Belting elements are preferably used thrust belt. Such thrust belts usually contain a variety of individual metal elements that are put together be and on both sides of the radial plane of the finished push belt are each held by an elastically deformable ring package.

For an exact one Mounting a push belt, it is necessary, the final to determine exactly to set a specific game exactly can. Furthermore, it is a big one Endgame of the Schubgliederbandes a crucial parameter for "Scratch Noise. "Scratch Noise occurs when the transmission is operated in the unloaded state and there is a game. In this case, the push elements are not permanently under compressive stress and are transported on the slack side "depressurized" They then hit the flanks of the first disc, they become braked.

The Metal band that holds the push rods together is still under tension. The push belt is on both discs with a contact pressure applied. This results in a certain friction radius, regardless of the power transmission over the Tape. Now if the transmission in the no-load condition (for example, when gas is removed on the highway) is pushed further, a certain translation over the Contact forces, although the gearbox does not drive, making the belt permanent under tension. Now if the tape on the first disc meets, as mentioned above, braced the push elements under tension. Because a certain minimum game in the band is necessary, the band slips a little, until the push members by the friction between the metal band and the push members be pressed together. This leads to a first noise, the so-called "teeth chattering." At the moment, in which the tape slips changes In addition, the effective diameter for determining the translation. The effective diameter of the strained band is through the midline the contact surfaces of the Thrust members determined. The effective diameter at slipping Me tallband is the diameter of the metal strip on the disc, not the smaller effective diameter of the push elements. Due to these translation fluctuations it comes to speed fluctuations, which stimulate a vibration, which are transmitted to the transmission housing can, audibly is and is perceived as unpleasant. Additional parameters for scratch Noise next to the endgame of the push belt are contact pressure, Roughness and operation in certain speed-speed ranges.

To In the prior art, the belt is used to determine the endgame lying and examined without load. This is a feeler gauge Manually pushed into the scope of the tape and the tape becomes raised. If the tape can be lifted, the game is low enough if the tape slips off, there is too much play, with the the game is too low, if the feeler gauge can not be inserted. The only force acting on the band is the low force Hand strength over the friction on the front / back sides transferred to the tape and push them apart.

This Procedure is for serial production complicated and disadvantageous of the dexterity and experience of the examiners dependent; Tolerances can only difficult to be checked and defined, as this is also z.T. from the subjective impression of the investigator depends. In addition, the individual members of the band have tolerances, which the curvature the front / back sides As. When measured on either two concave or convex limbs will be, different results will emerge, even if the Tolerance range of the individual members is maintained.

• – Elementvorder- oder Rückseiten sind nicht plan und täuschen größere Elementdicke vor;
• – Schmutzpartikel zwischen den Elementen;
• – Ölfilmdicke zwischen den Elementen;
• – Elemente liegen durch Reibeinflüsse bedingt nicht aneinander.

During the measurement, the measurement accuracy can also be worsened by the following parameters:

• - Element front or back sides are not plan and fool larger element thickness;
• - dirt particles between the elements;
• - oil film thickness between the elements;
• - Elements are due to frictional effects not together.

Of the The present invention is based on the object, a method for the measurement of the final play in the case of thrust belts of a variator of a stepless transmission specify which the disadvantages of the state avoids the technique and allows an exact measurement.

These The object is solved by the features of claim 1. Further Variants and advantages emerge from the subclaims.

Therefore It is proposed firmly clamp the push belt and a Test or measuring wedge to apply a defined force. Depending on how far the wedge pressed into the band There is a certain game available. The result can be on the computer be evaluated; Deviations by inaccurate measuring by hand become avoided in an advantageous manner.

According to the invention becomes the endgame of the band with a certain preload determined on the elements, wherein the biasing force by means of a very flat wedge and a test force is applied so that the elements with the applied by the wedge Power to be piled up.

The Invention is described below with reference to the attached figure, which is the application schematically illustrates the method, explained in more detail by way of example.

In the figure, the push belt with 1 , the individual thrust members with 2 , a ring package with 3 and the test or measuring wedge with 4 designated.

According to the invention is in a firmly clamped push belt 1 a test or measuring wedge 4 acted upon by a defined force, so that the wedge between the thrust members ( 2 ) or elements in the band 1 is pressed. The existing game can be calculated from the distance that the wedge 4 into the band. In the figure, the force is on the wedge 4 acts as illustrated by the arrow.

Here, the wedge points 4 on a landing side a recess in the longitudinal direction, to the buttons of the push members 2 or to be able to record elements. On the other, opposite side, points the wedge 4 hash marks 5 on where the game measure can be read as a function of the distance traveled at the height of the pitch line of the elements.

to Setting a desired Game are then to use elements whose stack length of measured gap and the desired one Match matches. The staple length This can be achieved by a combination of elements and filling elements be set.

The Length of one Element stack can be determined in the context of a length measurement, with external forces the Stack in the longitudinal direction burden errors in the flatness of the elements can be compensated. Advantageously, the elements are guided in rails, so that a controlled position of the elements is made possible.

alternative To a game can also have a predetermined bias of the elements compared to the Ring packages can be set if desired.

1

Thrust belt

2

pusher member

3

ring package

4

Test or measuring wedge

5

line marking

Claims (2)

Method for measuring the end play in the case of push belt bands of a variator of a continuously variable transmission, characterized in that the push belt ( 1 ) and that a test or measuring wedge ( 4 ) is applied with a defined force and pressed into the push belt, wherein the existing game is calculated from the distance that the wedge ( 4 ) in the band ( 1 ) covers. A method according to claim 1, characterized in that a test or measuring wedge ( 4 ) is used, which has on a landing page a recess in the longitudinal direction to the buttons of the push members ( 2 ) or elements on the other, opposite side bar marks ( 5 ), on which the game measure can be read as a function of the distance traveled.