DE102007016019B3 - Front wheel gear tooth system for use in vehicle, has front wheel connected with angular sensor for measuring rotational angle of wheel, where rotational angle is adjusted based on height displacement - Google Patents

Abstract

The system has front wheels (11, 12) engaged with each other. Each wheel has a sequence of teeth (21, 22) in course of its circumferential edge. The teeth have tooth profiles different from adjacent tooth. One of the teeth has recesses completing the tooth profiles for engagement of the tooth. The wheel (12) has a belt coil axis, on which a belt band is rolled for measuring height deflection of a vehicle seat The wheel (11) is connected with an angular sensor for measuring rotational angle of the wheel (11), where the rotational angle is adjusted based on the height displacement.

Description

The The invention relates to a spur gear toothing with at least two in one another engaging spur gears, wherein each spur gear in the course of its peripheral edge a sequence of teeth according to the preamble of claim 1.

cylindrical gears are in many ways known and for various applications can be used. In mechanical engineering belong spur gears the most common occurring machine elements and are used for example in transmissions of any kind for transmission of torques and rotational movements between two or more Waves used.

Frequently Such Stirnradpaare designed in their function such that they have a variety of complete ones Turns for transmission of the torques should.

A further use of spur gears can be found again in the area of signal acquisition, in which often Angle of rotation sensors over a common shaft can be connected to one of the spur gears to a certain rotational position of this spur gear and thus also the another associated spur gear, which with another element connected to determine. This is for example when carrying out a Panning asked when a pivoting element over a Spurradverzahnung is connected to a rotation angle sensor, since an accurate determination of the instantaneous position of the pivoting element should be determined. This is over the gears having interconnected spur gears possible.

at Such pivoting element devices is also desired that the zero point of the undeflected rotation angle sensor with a starting point an oscillating movement of the pivoting element coincides, so that the rotation angle indicated by the rotation angle sensor, the instantaneous Pivoting position of the pivoting elements and the resulting Rotary movement of one of the spur gears reproduces.

In order to bring about such a coordination between the starting point of the oscillating movement and the zero point of the rotational angle sensor during the assembly of the spur gear toothing, when two spur gears are used, the two spur gears with the teeth arranged peripherally have markings, for example in the form of an arrow, on their surfaces, as it is in 1 by the reference numerals 6 . 7 will be shown.

In the 1 reproduced spur gears 1 . 2 are on two axes of rotation 3 . 4 rotatably arranged, wherein the axes of rotation 3 . 4 should be spaced apart from each other as it is by a straight line 5 is pictured. This distance between the two axes of rotation 3 . 4 will only be obtained if the circumferentially arranged teeth 8th optimally meshed. If this is not the case, a greater spacing of the two axes takes place after mounting the spur gears.

In 1a are the two spur gears with mutually facing markings 6 . 7 for the initial adjustment of the starting point of the oscillating movement of the pivoting element and the zero point of the rotation angle sensor shown. The arrows 6 . 7 need to such a balance reliably on the common line 5 During the assembly process, therefore, this requires increased attention from the installer even considering the fact that a large number of devices to be mounted exist.

In 1b is a state of both spur gears shown after an initial rotation. In this state, both arrows point 6 . 7 each upwards.

In 2 are the two in 1 shown in a state which occurs when the two spur gears have not been mounted in the correct manner. In this case, the two arrows 6 . 7 viewed circumferentially at different levels, even if the arrow 6 or the arrow 7 during an initial position on the straight 5 located. This has the consequence that no adjustment between the zero point of the rotation angle sensor and the starting point of the oscillating movement has taken place, so that an incorrect pivoting position of the pivoting element is reproduced by the rotation angle sensor.

A Such incorrect installation of both spur gears has a mandatory Error detection by means of a downstream control device or a control person who, as an additional examining body, incurs time and cost the production of such spur gears having devices is.

In 3 and 4 For example, another example of two spars not mounted correctly to provide spur gear teeth according to the prior art is shown. As can be seen from these two illustrations, each spur gear has 1 . 2 once again shaped teeth 8th on, at a location along the peripheral edges of the spur gears by means of a wider shaped projection 9 which is in a corresponding recess 10 engages the opposite spur gear. This is going out 3a and 3b seen.

One Such projection should during assembly of the spur gears Match between a rotation angle sensor in its zero position and the zero point of the oscillating movement of the pivoting element or ensure a rolling belt.

By comparison with the in 4 reproduced representation is, however, seen that as well as a mounting in the wrong way is possible by the individual teeth 8th mesh, but the projection 9 opposite the projection 10 offset in the circumferential direction is arranged such that an engagement of the projection 9 into the recess 10 not possible. As a result, a subsequent check after installation of the spur gears is again necessary to correct such errors again.

DE 947 584 B shows a speed change gear with a gear that is consistent and with an engaging gear that rotates at varying peripheral speed.

US Pat. No. 6,849,023 B1 shows a gear, which among other things spur gears with five meshing spur gears has.

US 4,911,032 A shows intermeshing gears with different tooth shapes.

US 2,399,925 A also shows intermeshing gears with different tooth shapes.

JP 09 152 014 A shows a gear with differently formed tooth shapes.

Also DE 143 943 A shows intermeshing gears.

The objects all The above publications are not in connection with Gurtaufrollmechanismen considered.

DE 103 42 443 A1 relates to a vehicle seat for a motor vehicle, wherein a Gurtaufrollmechanismus is shown. The height deflection of the vehicle seat is not measured here.

US 2002/0130528 A1 also relates to a vehicle seat with a Gurtaufrollmechanismus in which the height deflection of the vehicle seat is not measured within the Gurtaufrollmechanismusses.

As a result, The present invention is based on the object, a spur gear with at least two intermeshing spur gears for one Vehicle webbing retractor to disposal to provide an assembly of the two spur gears in a correct rotational position allows each other in a simple and timely manner.

These Task is performed according to the characteristics of Claim 1 solved.

One essential point of the invention is that with a spur gear toothing with at least two meshing spur gears, wherein each spur gear in the course of its peripheral edge a sequence of tooth in the sequence of teeth every tooth is opposite the tooth shape which differs at least immediately adjacent teeth wherein the respective other spur gear complementarily interacts with the tooth forms Recesses for engagement of the teeth of both spur gears into each other having. In this way, by the differently formed tooth shapes ensured that at an incorrect rotational position of the both spur gears to each other during their assembly no meshing of the teeth is possible, so that thereby inevitably an increased spacing the axes of rotation of the two spur gears would give each other. This prevents mounting of both spur gears and thus eliminates a subsequent Control or inspection body, the correct installation of both spur gears to each other with the right one Rotary position checked. Much more the assembling person can already during the assembly process notice that there is a misalignment of both spur gears is to by properly positioning the rotational positions of the spur gears subsequently a mesh of teeth and thus to enable the actual assembly process. It is not just a light, but also done in the right way and an additional exam avoiding assembly, especially with a high number of to be mounted spur gears possible.

By such a spur gear toothing is not just the desired balance between a zero point of an oscillating movement of a pivoting element, which with one of the spur gears is connected, and a rotation angle sensor, which with another Spur gear is connected, but can also be any other Kind of match between two different elements, of which one each connected to one of the spur gears are performed. A perfect rolling the spur wheels should by the differently trained and successive Teeth not be influenced, so that parameters such as engagement distances, profile coverage and rolling conditions continue to be maintained in their optimized way.

Advantageous In such a spur gearing, each tooth has a different one Tooth shape on, so no repetitive sequences in the Teeth of the teeth occur along the peripheral edge of the spur gears.

Of course, such spur gears alternatively with a rack or by means of an internal toothing be coupled with each other.

The different tooth shapes are in different divisions, different modules, different tooth heights, in particular different Addendum heights and different tooth feet heights, different Tooth widths, different flank angles and different Flank forms and different engagement lines and / or reproduced the same Zahnformparametern. In this way arise, for example by the use of different Zahnfuß- and Zahnkopfhöhen as well different flank angle different tooth shapes in a sequence along the peripheral edge, the wrong mounting both spur gears, that are supposed to be intertwined, make it 100% impossible.

Advantageous can according to a embodiment invention, two successive teeth form a double tooth, around its surface by means of a special surface course to code. Of course have to the associated Recesses in which the teeth engage, be formed according to complementary.

each Spur gear advantageously has circumferentially at least one projection on, whose width is greater than is a tooth width and the one stop element to each other Fixing the meshing spur gears at a defined rotational position represents. This is done by touching each other Stop elements on its stop side and ensures that a complete Rotation of the spur gears not possible is, but only until the matching of the second stop pages the two stop elements after the start of a rotation both first stop sides of the stop elements interacted to have. Therefor have the stop elements rectilinear stop sides on, an angle of 70 ° -170 °, preferably from 100 ° -140 °.

Fiction according to that is first spur gear with a belt spool axis, on which a webbing for measurement a height deflection a vehicle seat is rolled up, and the second headband with an angle sensor for measuring adjusted due to the belt deflection Rotation angles of the spur gears connected.

The spur gears can both spur gears or helical gears or represent the same known teeth with different tooth position. The decisive factor here is that the individual teeth in their Cross-sectional shape have different shapes.

advantageous embodiments emerge from the dependent claims.

advantages and expediencies are also the following description in connection with the To take drawing. Hereby show:

5 in a schematic representation of a spur gear toothing in different rotational positions according to an embodiment of the invention;

6 in the 6 reproduced spur gear teeth in incorrectly mounted rotational position state;

7 in a schematic extract representation of a portion of the two spur gears of a spur gear toothing according to the invention;

7a in an enlarged schematic representation of a recess with it engaging tooth with the gear parameters reproduced therein;

8th in a larger number possible different tooth shapes according to the inventive spur gear toothing in a schematic representation;

9 in a sectional view, a portion of the two spur gears with teeth of different modules, and

10 in a perspective view of a vehicle seat belt retractor for detecting the height adjustment and with a running height stop for an actively controlled vehicle seat suspension.

In 5 is shown in a plan view a spur gear according to an embodiment of the invention. The two spur gears 11 . 12 are on two axes of rotation 13 . 14 mounted, with the two axes of rotation 13 . 14 on a common line 15 lie.

Two stop elements 17 are with one opposite the remaining teeth 21 . 22 greater width arranged on the peripheral edge of the end edges, so that exceeding these stop elements is not possible due to their shape.

The two spur gears 11 . 12 can be along a direction of rotation, as indicated by the two arrows 19 . 20 is reproduced, until it is at the bottom of the two spur gears, as in 5c taking into account the representation according to 5b is reproduced, have arrived and here again have a stop effect by their interaction.

The two axes of rotation 13 . 14 are at a distance 16 spaced apart.

The teeth 21 of the spur gear 11 and the teeth 22 of the spur gear 12 wise - like that 5a - 5c can be clearly seen - different tooth shapes in their cross-section, the meshing of the two spur gears 11 . 12 allow only in the matching tooth shapes and the correspondingly complementary recesses, so that while maintaining the distance 16 between the axes of rotation 13 . 14 an assembly of the two spur gears only with the correct rotational position of both spur gears is possible. This allows a kind of calibration of each of the spur gears arranged elements by their rotational positions are matched to each other when an assembly of both spur gears takes place.

In 6 is a schematic representation of the in 5 shown spur gear shown in case of incorrect installation. According to the two illustrations 6a and 6b It can clearly be seen that in the case of an incorrect assignment of the individually shaped teeth 21 . 22 to each other and the corresponding complementary recesses formed no meshing of the teeth of the two spur gears 11 . 12 is possible, so that thereby an offset 23 the axis of rotation 14 opposite the axis of rotation 13 and thus an increase in the distance 16 between these two distances would result. This has the consequence that an assembly of both spur gears is not possible or only with great effort. As a result, a wrong assembly is avoided.

The 6a and 6b It can also be clearly seen that the two stop elements 17 . 18 first stop pages 17b and 18a as well as second stop pages 17a and 18b each having an interaction by contact with each other, when the two spur gears have been rotated correspondingly far. A complete revolution of the spur gears is not possible due to the presence of these two stop elements. However, the interacting tooth shapes can alternatively be used with gears without stop elements, so that a complete rotation of the wheels is possible.

Both stop sides, which are rectilinear, close an angle 17c and 18c a, which may preferably be in a range of 70 ° to 170 °, depending on which diameters have the spur gears.

In 7 are shown in a schematic representation of two sections of a spur gear according to the invention. In the 7 reproduced representation is intended to illustrate that two consecutive teeth 24a . 25a and their corresponding complementarily formed recesses 24b and 25b according to the invention to a double tooth 26a and a correspondingly complementary recess 26b can be summarized to thereby a coding in the area 30 to get the tooth surface.

With the reference numerals 27 . 28 The circles assigned to the spur gears become along half the height of the teeth 24a and 25a played.

Along Wälzflanken 29a and 29b takes place at a summary of both teeth 24a and 25a to a double tooth 26a no change takes place. A coding of the tooth shape of the individual teeth is rather in the field 30 , which has the double width of two teeth instead, as for example in 8th is shown in various embodiments. By such a combination of two teeth to a double tooth flawless rolling of the spur gears and other parameters, such as the engagement distance, the profile overlap and the rolling ratio is not adversely affected.

The double-wide tooth can according to 8th having I-X designated and illustrated forms. For example, a double tooth 31 two differently wide teeth heads or two teeth formed with different tooth flank shapes 32 . 33 and 34 exhibit. Of course, both parameters can also be combined, as for example from the teeth 35 . 36 evident.

To increase the diversity in the distinction of individual tooth shapes, individual teeth may extend over or under a tip circle or Fußkreisdurchmesser, as for example in 8th through the teeth 38 . 39 is reproduced.

Of course, such a tooth 40 be formed with three tooth heads.

These Teeth can be in their sequence be provided with different modules and divisions, so that this also creates a number of different variants.

In 7a is a schematic of a tooth with the parameters tooth height h, Zahnfußhöhe h _f , tooth head height h _a , tooth width b, pitch P and tooth flank angle α reproduced.

In 9 a spur gear toothing according to a further embodiment of the invention is shown in a detail. Here are teeth 41 . 50 the two spur gears 11 . 12 designed such that they have different modules combined with a common pitch circle. It will be the in 8th reproduced double-tooth variants according to the example of 9 doubled in number by the coupling of two different modules, so that even with larger numbers of teeth sufficiently different tooth shapes are present. For example, the teeth point 43 . 45 of the spur gear 11 as well as the tooth 44 of the spur gear 12 the module m = 1 on while the teeth 47 . 49 of the spur gear 11 and the teeth 42 . 46 . 50 of the spur gear 12 a mixing module, ie each have a tooth flank with module m = 1 or m = 1.25, however, the teeth 48 of the spur gear 12 exclusively has the module m = 1.25.

In 10 is shown in a perspective view of an application example of the spur gear according to a Gurtbandaufroller mitlaufendem height stop for an actively controlled vehicle suspension. Such a belt retractor 53 has a strap 54 on, by means of a rolling roller 55 on a rotation axis 56 is rollable and with the spur gear 12 connected is. The spur gear 12 is just like the spur gear 11 equipped with the toothing according to the invention, so that a quick and easy installation of both spur gears is possible.

Both spur gears 11 . 12 can perform a rotational movement, starting from the first stop side surfaces of the stop elements 17 . 18 up to the meeting of the second stop sides of the stop elements 17 . 18 enough. This represents a height stop.

The spur gear 11 is about a rotation axis 58 with a rotation angle sensor 59 connected, the rotation of the spur gears and thus the current position of the belt 54 and thus the current height position of the attached vehicle seat notes. Thus, no wrong assembly of the two spur gears 11 . 12 occur when a zero point of the rotation angle sensor 59 should initially be compared with a starting position of the vehicle seat in terms of its height. All components are inside a housing 57 mounted on the webbing retractor.

All Features disclosed in the application documents are considered to be essential to the invention as long as they are individually or in combination with respect to State of the art are new.

1, 2, 11, 12

spur gears

3, 4, 13, 14

rotational axes

5, 15

Just

6 7

marks

8th; 21, 22; 24a, 25a, 26a; 31-40; 42-50

teeth

9 10

Head Start, recess

16

distance

17 18

stop elements

17a, 18a, 17b, 17b

locating faces

17c, 18c

angle

19 20

Rotational angular directions

23

offset

27 28

circular sections

29a, 29b

Wälzflanken

30

coding

51 52

circular sections

53

webbing retractor

54

webbing

55

winding roller

56

axis of rotation

57

casing

58

axis of rotation

59

Rotation angle sensor

Claims (8)

Spur gear with at least two meshing spur gears ( 1 . 2 ; 11 . 12 ), each spur gear ( 1 . 2 ; 11 . 12 ) in the course of its peripheral edge a sequence of teeth ( 8th ; 21 . 22 ; 24a . 25a . 26a ; 33 - 40 ; 42 - 50 ), wherein in the sequence of teeth ( 21 . 22 ; 24a . 25a . 26a ; 31 - 40 ; 42 - 50 ) every tooth ( 21 . 22 ; 24a . 25a . 26a ; 33 - 40 ; 42 - 50 ) one of the at least immediately adjacent teeth ( 21 . 22 ; 24a . 25a . 26a . 31 - 40 ; 42 - 50 ) has different tooth shape, wherein the respective other spur gear ( 11 . 12 ) with the tooth shapes complementary interactive recesses ( 24b . 25b . 26b ) for meshing the teeth ( 21 . 22 ; 24a . 25a . 26a . 31 - 40 ; 42 - 50 ) of both spur gears ( 11 . 12 ), characterized in that the first spur gear ( 12 ) with a belt spool axis ( 56 ) on which a webbing ( 54 ) for measuring a height deflection of a vehicle seat can be rolled up, and the second spur gear ( 11 ) with an angle sensor ( 59 ) for measuring rotational angles of the spur gears set by the belt deflection ( 11 . 12 ) connected is. A spur gear according to claim 1, characterized in that the tooth forms of all teeth ( 21 . 22 ; 24a . 25a . 26a . 31 - 40 ; 42 - 50 ) of each spur gear ( 11 . 12 ) differ from each other. Spur gear toothing according to claim 1 or 2, characterized in that the tooth forms in the division (p), the module (m), the tooth height (h), the tooth head height (h _a ), the Zahnfußhöhe (h _f ), the tooth width ( b), the flank angle (α), the edge shape and / or the engagement distance differ. Spur gear according to one of the preceding claims, characterized in that in each case two successive teeth a double tooth ( 26a ; 31 - 40 ) form. Spur gear toothing, according to one of the preceding claims, characterized in that each spur gear ( 11 . 12 ) has at least one projection on the circumferential side, the width of which is greater than a tooth width and which is a stop element ( 17 . 18 ) for mutual fixation of the intermeshing spur gears ( 11 . 12 ) represents at a defined rotational position by mutual contact of the stop elements on their stop sides. Spur gear toothing according to claim 5, characterized in that the stop elements ( 17 . 18 ) two rectilinear stop sides ( 17a . 17b ; 18a . 18b ), which have an angle ( 17c . 18c ) of 70 ° -170 °, preferably from 100 ° to 140 °. Spur gear toothing according to one of the preceding claims, characterized in that the spur gears ( 11 . 12 ) Represent spur gears. Spur gear toothing according to one of claims 1 to 6, characterized in that the spur gears ( 11 . 12 ) Represent helical gears.