DE102005008297A1 - Method of determining the movement of a wrap around means such as a chain or belt of a gear system determining a deflection of a conical plate - Google Patents

Abstract

The method determines movement of a belt or chain (30) or the like arranged between two conical plates (12,14) of a continuous wrap around gear. A radial disturbance deflection in the region of the turn of the belt at the plates is determined. INDDEENDENT CLAIMS also cover apparatus for carrying out the method.

Description

The The invention relates to a method and a device for determining the movement of a belt of a belt drive.

It Stepless transmissions are known in which by between the Conical disks of two conical disk sets arranged belt (Chain, push belt, belts, etc.) the transmission ratio continuously changed can be. By applying the same value of the contact pressure on the two conical disk sets becomes the strength level for the torque transmission through the belt is adjusted. By default different Values of the contact force on the two conical disk sets is an additional Force component for the radial transport of the belt generated between the conical disks, whereby by variation of this additional contact force the gear ratio of Gear can be adjusted continuously in any steps.

Such a continuously variable transmission is used for example in the DE 44 40 278 C1 described. The first set of conical disks of this belt transmission is arranged on a variator input shaft and comprises a fixed and a conical disk (loose disk) which can be displaced axially by means of a hydraulic medium. This conical disk set is connected via a belt designed as a thrust belt or chain Umschlingungsmittel with a second just such a set of conical disk on a Variatorausgangswelle, which is arranged axially parallel to the first drive shaft. This second cone pulley set is usually downstream of a planetary gear for a forward and reverse gear and a differential gear drive technology.

adversely this is because the stepless belt transmission to vibrations at the belt tends. A kind of these vibrations are transverse vibrations in the strands of the belt. A possible Stimulation of these vibrations is radial, that of the variator is impressed on the belt.

radial Suggestions of this kind can For example, caused by run-out errors and concentricity errors on the conical disks, an eccentric connection of the respective Losscheibe on the variator shaft, shaft deflection or bending vibrations the variator shafts, running errors in the shaft bearing and by the Radial position distribution (saddle height distribution) of the links in the push belt.

It has proved to be particularly disadvantageous that the conical disk sets and the belt is damaged by these vibrations can and so at least their lifetime is shortened. To vibrations of the belt as far as possible it is possible to prevent a high preload force for to use the belt which, however, also on the one hand the efficiency of the transmission and on the other hand its life, for example by drilling friction between the treads the thrust belt and the running surfaces of the conical disks, reduced.

It was also found to be disadvantageous in that the factors contributing to Contribute radial vibration excitation, not clearly detected and can be determined.

Therefore The Ertindung is the object of a device and a Introduce methods with which in a simple way and by low constructive effort radial excitations of a belt, which contribute to the generation of transversal vibrations can be. In addition, the method is intended to evaluate the production quality of a belt transmission allows based on inadequate well-made gearboxes can be singled out and reworked.

The solution This object is apparent from the features of the independent claims, while advantageous Refinements and developments of the invention, the dependent claims are.

Therefore concerns the invention first a method for determining the movement of a belt, which is arranged between two conical disks of a continuously variable transmission is, with a radial disturbance deflection in the area of the wrap around the conical discs at least a conical disk set of the gearbox variator is determined.

Consequently can continuously variable belt transmissions, in particular its conical disks and the wrapping means in their interaction with respect to their tendency to produce transverse vibrations of the belt simply and effectively analyzed and evaluated with regard to their production quality become.

Is namely the radial disturbance deflection to large, this is considered an indication that in the real environment of the belt is too strong vibration excitation will be exercised on the same. Such a variator would not be well suited. An operator of the device for carrying out the proceedings, for example a skilled worker on a final test stand in a production facility for these transmissions, can therefore dispose of a qualitatively insufficiently well-made belt transmission or such a variator or belt, so that this can be further analyzed and / or or a reverse assembly can be supplied.

It is also possible that only randomly one the two conical disk sets, the Variatorwellen and the wrapping means comprising a variator of the components an ongoing transmission production and the test procedure according to the invention is subjected, so in dependence from the test result this variator is used or discarded.

• a) Anordnen des Umschlingungsmittels auf mindestens einem Kegelscheibensatz,
• b) Einstellen der Kegelscheiben des Kegelscheibensatzes derart, dass das Umschlingungsmittel an einer oberen oder unteren radialen Maximalposition (Overdrive, LOW) innerhalb des Kegelscheibensatzes angeordnet ist,
• c) Erfassen der radialen Position des Umschlingungsmittels, d) Drehen des Kegelscheibensatzes,
• e) Erfassen der radialen Störauslenkung des Umschlingungsmittels während der Bewegung des Umschlingungsmittels und
• f) Bewerten der Störauslenkung.

By way of example, the following method steps for using the method according to the invention can be adhered to:

• a) arranging the belting means on at least one conical disk set,
• b) adjusting the conical disks of the conical disk set such that the belting means is arranged at an upper or lower radial maximum position (overdrive, LOW) within the conical disk set,
• c) detecting the radial position of the belt, d) rotating the cone pulley set,
• e) detecting the radial disturbance deflection of the belt during the movement of the belt and
• f) Evaluate the disturbance deflection.

Consequently are the running errors of the variator and the saddle height distribution total determined. First, variator and push belt built up real. In the area of the wrap (primary and / or secondary) if a radial displacement measurement is installed by means of the displacement measuring means, which detects the ring packets of the belt. As possible the entire running range of the conical disk set is to be recorded, the measurement is over carried out at least a complete circulation of the belt.

The Contact pressure of the variator is then chosen so that the belt safely rotates at one of its two radial stops and sufficiently biased is. Thus, a real experimental environment is created, which is the Practice, i. the installed state in the continuously variable transmission, equivalent. The variator is then rotated at a very low speed, to go through the belt means under the path measuring means to let. The distance measuring signals can then triggered for evaluation on conical disk position or tape position to make a reference to the components.

The radial disturbance deflection of the belt, represented by the path signal of the measuring device, describes the quantity and quality of radial vibration excitation. There can be a correlation between the disturbance deflection and the transverse vibrations during of the barrel of the variator.

Prefers is provided in this method as indicated above, that the radial disturbance deflection of the belt during at least one complete one Recirculation of the same recorded and then evaluated.

Although the measurement of the radial vibration excitation of the belt transmission is preferred in the end stop positions of the variator, ie at maximum or minimum gear ratio, corresponding to the upper or the lower radial maximum position (Overdrive, LOW) of the belt is performed, is it with higher Evaluation effort regarding the measurement results also possible, this Measurement outside the upper or lower radial maximum position of the belt perform.

So is according to one further variant of the method according to the invention, that the evaluation of the disturbance deflection in dependence of the variably adjusted radial position of the belt he follows. This procedure takes into account that in others Strapping agent positions outside of the above Radial maximum positions, where appropriate, certain additional Calculation methods must be used to understand the effects of Pressure fluctuations in the translation and filter out the contact force control of the variator in such a way that useful Readings available stand.

All in all it will be preferable to provide that if the values of the radial disturbance deflection exceed predetermined thresholds, an unacceptable quality the gear, the variator and / or the belt means recognized becomes.

In In this context, it is considered useful if the respective predetermined amount of the threshold values of the selected radial position of the Belting in the cone pulley set depends.

According to one Another variant of the invention provides that after detection an unacceptable quality of the transmission, the variator and / or the belt Signal for an operator or a computer is generated.

With Advantage is the method according to the invention at a quality test bench in Variator or gearbox manufacturing, in a motor vehicle workshop or in carried out a motor vehicle itself. In the latter Use is preferably provided that the method in the motor vehicle at predetermined intervals, for example, time intervals, carried out which reduces the effects of wear-related sources of disturbance are detectable.

The with regard to the disturbance deflection the Umschlingungsgetriebes measured path signal can be analogous to a Evaluation of roughness measurements of a surface with the methods of the standardized key figures are evaluated. This is the Vibration excitation of a variator / belt combination determined and measured with the or predetermined Schwingungsanregungs- or disturbance deflection values of sufficient compared to good transmissions.

Further are limits for determines the spread of the path signal to the vibration amplitudes of the belt to limit, thus consequential damage to components to avoid by too high vibration excitation. Is an upper one Limit for Having found the vibration excitation, gearboxes can be analyzed for vibrations and quality. When exceeding the permissible limit at the final test bench a transmission can be restrained and possibly an analysis and / or reassembly be supplied.

The The invention also relates to a device for determining the movement a belt, which between two conical disks of a continuously variable belt drive is arranged. This device is characterized in that in the region of the loop at least one conical disk set at least one path detection means for detecting the radial position and / or a radial disturbance deflection of the belt is arranged.

By this device becomes the conical disk set to be checked and the wrapping means simple and effective Check if this is for radial disturbance deflections causal are, which stimulate the belt to unwanted vibrations.

These Device preferably also has one with the at least one Distance calculation means connected calculation unit for calculating the radial disturbance deflection dependent on from the radial position of the belt between the Cone disks of conical disk set on.

The Path detection means detects the radial position of the belt and above In addition, the radial disturbance deflection with respect to the respective position of the belt. It will for determining the radial disturbance deflection the Distance between the path detecting means and the top of the belt continuously detected within a predetermined period of time while the Strapping means clamped clamped in the cone pulley set. conditioned by disturbing influences of the conical disk set, for example, by axial runout and Concentricity error, this distance does not become within the time period be constant, and a distance representing the course will be over Time have a ripple and / or gradients. This distance is dependent to the respective radial deflection of the belt or is the same.

at this embodiment Signals are in response to the radial position and radial interference of the wrapping means, which is detected by the path detecting means be, for example, over electrical lines sent to the calculation unit. The calculation unit sets the radial disturbance deflection preferably with respect to the radial position of the belt. Consequently a very accurate course of the radial disturbance deflection can be determined. In a further embodiment can they courses stored in a storage unit connected to the calculation unit and at a later time Time to be retrieved again.

moreover can according to a another variant, the device with a connected to the calculation unit Alarm device equipped to output a notification signal equipped which outputs a warning signal to a human or a computer, if the amount of radial disturbance deflection individually or as an average over one revolution of the belt means exceeds a predetermined threshold value.

For example, the alarm device may include a comparator which compares two signals each applied to its inputs. In this case, an input signal corresponds to the supplied radial disturbance deflection and a further signal corresponds to a threshold value. The threshold value can be set individually by an operator of the device at the final test stand and corresponds to a radial deflection which does not exceed may be taken. If the supplied signal corresponding to the radial disturbance deflection smaller than the preset threshold, the comparator outputs at its output, for example, a signal with a low level. If, on the other hand, the supplied signal exceeds the preset threshold value in accordance with the radial disturbance deflection, then the comparator outputs a signal with a high level at its output. In response to the high-level signal, a signaling device, for example a warning lamp or a warning horn, is then activated. As soon as the signaling device is activated, the operator is informed that the radial disturbance has exceeded the pre-set threshold. By means of such signaling, the operator can then separate out or withhold the conical disk set tested in each case.

The at least one path detection means is preferred as non-contact formed inductive displacement sensor. Such a transducer recorded the radial position and radial disturbance deflection of the belt without mechanical influence on the system during the measurement.

According to one Another embodiment of the invention can be provided that the device on a quality test bench for variators, Belting or on a built in a vehicle Belting is arranged.

at A last variant may be provided that the path detecting means is formed fastened to a belt transmission such that this can be closed by a closable by means of a lid opening in the gearbox protrudes. Due to this construction, it is possible already fully manufactured Gearbox relative their quality characteristics to check for a smooth running of the belt.

The Invention leaves itself with reference to an embodiment further explain. For this purpose, the description is accompanied by a drawing.

In this shows:

1 a sectional view of a variator of a belt transmission with a device for determining a radial disturbance deflection of the belt and

2 a measurement diagram in which the distance A of the belt from the variator longitudinal axis and radial disturbances Auslenkungen A1, A2 are shown via a circulation U of the belt.

1 shows therefore an axial sectional view of a primary cone pulley set 10 a variator of a cone pulley belt transmission with a first, on a variator shaft axially displaceable conical disk 12 , a second axially fixed conical disk 14 and with a belt designed as a push belt Umschlingungsmittel 30 ,

Furthermore, this figure shows a device 20 for detecting and determining a radial position A and of disturbance deflections A1, A2 of the belt 30 which experiences this due to the interference mentioned above.

The belt 30 is between the conical disks 12 and 14 arranged in contact pressure and contains in a known per se, individual block elements, between along the longitudinal extent of the belt 30 circulating spring packs are clamped.

The belt 30 has an outer contour, which is the geometry of the inner sides of the two opposite conical disks 12 . 14 largely corresponds. This allows the belt 30 glide up and down on these insides as soon as the position of the axially adjustable cone pulley 12 is adjusted accordingly. As is known, this radial positional adjustment is effected by pressurization of the side of the conical disk which is remote from the looping means 12 , which is designed as a piston of a piston-cylinder assembly and effective.

In 1 is the cone disc set 10 shown in one of two preferred measuring positions, in which the wrapping means 30 is pressed to its upper maximum position to stop. In this so-called overdrive position, the measurement may optionally negatively influencing pressure fluctuations Be Be costume by applying a maximum contact pressure, since a Einstelldruckschwankungsbedingte radial movement of the belt is excluded in this translation position. The same advantageous effect occurs in the so-called LOW position of the primary variator, in which the thrust belt 30 at unpressurized pressure chamber on the axially displaceable cone pulley 12 is located at its radially next to the variator shaft position.

Above the conical disks 12 . 14 are in the area of the loop of the same pathfinding means 40 arranged, which to the device 20 for detecting and determining the radial disturbance deflection of the belt 30 ge Listen. In this example, the wayfinding means 40 as electrical displacement sensors (for example, non-contact inductive displacement sensor), which is the distance to the surface of the belt 30 to capture. For example, here are two path detecting means 40 provided, so that an averaging between their determinable measured values is possible. However, it is also possible to examine the two sides of the belt during a rotation of the same separately with respect to radial disturbance deflections A1, A2.

Since it may occur due to variations in the quality of production of push belt that the saddle height distribution in the push belt over the circumference is not constant, so the individual thrust members of the push belt not geometrically identically aligned and are in contact with the conical disks, it comes in the push belt 30 during its circulation to radial disturbance excursion A1 or A2, which is the push belt 30 to excite harmful transverse vibrations, but by means of the displacement sensors 40 are exactly determinable.

The wayfinding means 40 Moreover, they have such an accurate measurement resolution that they can also detect the disturbing radial deflections A1, A2 resulting from runout errors and / or concentricity errors on the inner surfaces of the conical disk set, running errors in the bearing of the shaft bearing, etc.

The wayfinding means 40 are signaling with a calculation unit 45 connected. This unit 45 evaluates those of the route detection means 40 supplied data from. In a specific embodiment according to the invention, an alarm device 50 electrically with the calculation unit 45 be connected. The alarm device 50 contains a comparator 55 which outputs an alarm signal or warning signal when the disturbance deflection is exceeded above a preset threshold value. This signal becomes one with the alarm device 50 connected signaling device 60 fed. The signaling device 60 gives the operator at a final test a visual and / or audible indication of the manufacturing quality of the variator, the belt or the belt transmission.

2 shows a curve, the distance A of the belt 30 from the longitudinal axis of the variator shaft of the primary cone pulley set 10 and superimposed radial disturbance deflection A1, A2 of the belt 30 during a Umschlingungsmittelumlaufs U in the overdrive translation position of the conical disk set 10 reproduces.

As the curve illustrates, occur during the entire circulation of the belt 30 Radial disturbance deflections, which differ in their amplitude and in terms of their sign of each other. Radial disturbance deflections whose amplitude lies within the value band B, are considered unproblematic for the generation of transversal oscillations of the belt 30 evaluated, while beyond going deflection amplitudes A1 and A2 then an unacceptable pro- duction quality of the variator, the belt drive and / or the transmission characterize when their values and / or number exceed the thresholds B1, B2 defined by the value band boundaries.

If these thresholds B1, B2 in the comparison calculation in the comparator 55 exceeded, so is the signaling device 60 an alarm to the operator. The operator can then use the variator 10 or optionally only the belting agent 30 discard.

Even though the method and apparatus for determining the radial disturbance deflection so far when used in a test environment (for example, in a final test Variatorfertigung or gearbox manufacturing) have been described, they can also directly in the installed state of the continuously variable transmission in the Motor vehicle used and used. Both can do that Conical disk sets of the continuously variable transmission are checked permanently or at certain intervals. Should the radial disturbance deflection become too big over time due to wear or other circumstances, so then an alarm message can be issued to the driver. Alternatively or in addition can send a message during an inspection a trained person are spent, then what the appropriate Cone washer set and / or the belt means exchanged can be.

For the example case a quality control in a manufacturing facility can cost-reducing the arrangement of the measuring device directly be dispensed with on or in any transmission. In the simplest case will be in gear production at random from manufacturing taken from a variator or a gear and this on a suitable test stand with provided the device according to the invention, and the method according to the invention performed this.

It but it is also possible at an appropriate point of a gear housing an opening for a screw-on lid to provide, by a measuring device according to the invention kind to carry out of the method according to the invention can protrude through.

10

Conical disc set a variator

12

first, axially displaceable cone pulley

14

second, axially fixed conical disk

20

contraption for determining a radial deflection

30

endless

40

Wegerfassungsmütel

45

calculation unit

50

alarm device

55

comparator

60

signaling device

A

distance Endless / Variatorlängsachse

A1, A2

radial Störauslenkung on the belt

B

values band

B1, B2

thresholds

U

Orbital length of the wraparound

Claims (16)

Method for determining the movement of a belt ( 30 ), which between two conical disks ( 12 . 14 ) is arranged a continuously variable transmission, wherein a radial disturbance deflection (A1, A2) in the region of the wrap around the conical disks ( 12 . 14 ) at least one conical disk set ( 10 ) of the gearbox variator is determined. Method according to claim 1, comprising the steps of: a) arranging the belting means ( 30 ) on at least one conical disk set ( 10 ), b) Adjusting the conical disks ( 12 . 14 ) of the conical disk set ( 10 ) such that the wrapping means ( 30 ) at an upper or lower radial maximum position (overdrive, LOW) within the conical disk set ( 10 c) detecting the radial position (A) of the belt ( 30 ), d) turning the conical disk set ( 10 ), e) detecting the radial disturbance deflection (A1, A2) of the belt ( 30 ) during the movement of the belt ( 30 ) and f) Evaluating the disturbance deflection (A1, A2). Method according to claim 2, characterized in that the wrapping means ( 30 ) outside the upper or lower radial maximum position (overdrive, LOW) between the conical disks ( 12 . 14 ) is arranged. Method according to one of claims 1 to 3, characterized in that the radial disturbance deflection (A1, A2) during at least one complete revolution (U) of the belt ( 30 ) is detected. Method according to one of the preceding claims, characterized in that the evaluation of the disturbance deflection (A1, A2) as a function of the set radial position (A) of the belt ( 30 ) he follows. Method according to one of the preceding claims, characterized characterized in that, when the values of the disturbance deflection (A1, A2) predetermined thresholds Exceed (B1, B2), an unacceptable quality the gear, the variator and / or the belt means recognized becomes. A method according to claim 5 or 6, characterized in that the respective amount of the threshold values (B1, B2) of the selected radial position (A) of the belt ( 30 ) in the conical disk set ( 10 ) depends. Method according to claim 5, 6 or 7, characterized that upon detection of an unacceptable quality, a warning signal is produced. Method according to one of the preceding claims, characterized characterized in that the method is applied to a quality test bench in variator or gearbox manufacturing, in a workshop or in carried out a motor vehicle becomes. Method according to claim 9, characterized in that the method is carried out in the motor vehicle at predetermined intervals. Device for determining the movement of a belt ( 30 ), which between two conical disks ( 12 . 14 ) of a continuously variable belt transmission, characterized in that in the region of the loop of at least one conical disk set ( 10 ) at least one path detection means ( 40 ) for detecting a radial position (A) and / or a radial disturbance deflection (A1, A2) of the belt ( 30 ) is arranged. Apparatus according to claim 11, characterized by a with the at least one path detection means ( 40 ) associated calculation unit ( 45 ) for calculating the radial disturbance deflection (A1, A2) as a function of the radial position (A) of the belt ( 30 ) between the conical disks ( 12 . 14 ) of the conical disk set ( 10 ). Apparatus according to claim 11 or 12, characterized by a with the calculation unit ( 45 ) associated alarm device ( 50 ) for outputting a notification signal, when the amount of the radial disturbance deflection (A1, A2) individually or as an average over one revolution of the belt means a predetermined threshold (B1, B2) via below. Device according to one of claims 11 to 13, characterized in that the at least one path detecting means ( 40 ) is designed as a non-contact inductive displacement transducer. Device according to one of claims 11 to 14, characterized that the device on a quality tester for variators, belt transmissions or on a belt drive installed in a vehicle is arranged. Device according to one of claims 11 to 15, characterized in that the path detecting means ( 40 ) Is designed to be fastened to a belt drive in such a way that it projects through a closable by means of a lid opening in the transmission housing.