KR100495596B1 - Arrangement for adjusting parts with damping spring and method for manufacturing the same - Google Patents

Abstract

The present invention includes a drive wheel 16 and a drive gear 24, supported by the drive wheel 16 between the drive wheel 16 and the drive gear 24 and at least one of the drive gear 24. At least one spring element is arranged which cooperates with the shape 58 of the element, the spring element being formed as the leaf spring 36 and preferably radially disposed, in particular a gear selection motor in an automatic gear transmission It relates to a control device of 10).

Description

Arrangements for parts with damping springs and methods of making the device {ARRANGEMENT FOR ADJUSTING PARTS WITH DAMPING SPRING AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to an apparatus for controlling a component and a method for manufacturing the apparatus, according to the higher concept of the independent claim. Such a device in which the torsional vibration of the toothed wheel system should be attenuated is already known from EP 0 987 470. Here a plurality of helical springs are tangentially arranged between the contours of the outer toothwheel component and the inner hub component of the gearwheel. When both gearwheel components are twisted against each other, the helical spring stops the rotational vibration that occurs, or attenuates the generated shock when the component to be adjusted is suddenly stopped. Also known are window lift motors in which released rotational energy is attenuated by a rubber buffer disposed between the drive wheel and the drive cogwheel.

The device according to the invention with the features of the independent claims has the advantage of providing attenuation of the regulating device which can accommodate the generated high torque in a very compact structure. Compared to tangentially arranged helical springs, leaf springs require very little structural space to achieve high spring constants and high torque damping, especially when radially placed. The structural space is then saved in both radial and tangential directions. In addition to the damping rubber, the leaf spring has the advantage that the spring constant remains constant over large temperature ranges, stronger loads and longer lifetimes. This is especially important for use as a gear selector motor, among other things, because high safety and high loads are required here. For this use a compact structure is required, in particular in the radial direction, which cannot be realized by a helical spring tangentially arranged for the same torque. Above all, high torque can be effectively attenuated in the structure of the plurality of leaf springs in the circular structure.

The features described in the dependent claims enable other preferred forms of the device according to the independent claims. The invention relates first of all to a drive wheel in that the drive gear meshes with the drive gear. Of course the damping of the torque functions in the sense of kinematic reversal. Thus, it may be advantageous that the drive gear or drive gear is driven and the drive is implemented via the drive wheel or the drive gear also directly forms the drive gear simultaneously. The drive wheel thus comprises a respective stop surface for each leaf spring, which leaf spring contacts the stop surface when a predetermined torque is exceeded. This ensures that the leaf springs are protected before overload and damage and that the turning angle during damping is limited and limited.

Preferably the leaf spring is inserted into the drive wheel under internal stress. By this internal stress, for example in the case of a gear selection motor, the position of the component to be adjusted is targeted and detected by a torque less than the internally applied leaf spring. The detection allows, for example, the modification of a newly centered actuator between two defined edge positions. This allows the leaf spring to be subjected to relatively strong internal stresses and to be detected with a sufficiently high torque before the drive gear is elastically twisted against the drive wheel (torsional elasticity).

It is particularly advantageous for the assembly of the device to attach the leaf spring inside the drive wheel before the drive gear is installed. This is achieved in a simple manner by the back of the leaf spring being supported by the hub of the drive wheel and the opposite free end being supported by the outer inner wall of the drive wheel. In this way no additional attachment means or connection process is required. The entire radial structural space provided can be optimally used for the placement of the leaf springs.

Preferably, the drive wheel may be formed with an axial support pin, which supports the back of the leaf spring between the support pin and the hub. This eliminates the need for the leaf spring to be radially supported on the outer inner wall of the drive wheel, thereby preventing it from tilting during tangential movement of the end of the leaf spring. The support pin may also be formed to prevent tangential deviation of the leaf spring in the dorsal region of the leaf spring.

The internal stress of the leaf spring can be particularly well achieved by fixing the two legs of the u-shaped leaf spring against each other in installation. Both opening and compression are possible depending on whether the shape of the drive gear meshes inside or outside the u-shaped leaf spring. If internal stresses are created by fixing both legs against each other, no rigid coupling of the dorsal part of the leaf spring to the hub is necessary.

Advantageously the shape of the space part of the outer inner wall of the drive wheel engages the end of the leaf spring. This allows the u-shaped leaf springs to be subjected to internal stresses in a simple manner, since each of the walls (sides) of the two space sections holds the leaf springs under internal stresses. The leaf spring is thus supported only in the space part and the hub of the drive wheel and can be inserted into it-without coupling technology-under internal stresses without problems.

The space portion advantageously comprises two opposing side portions, one side means the seat-engaging surface of the end of the leaf spring under internal stress, and the opposing side portion advantageously limits the limits of elastic twisting. To form a stop surface (torsional elasticity).

Preferably the cross section of the shape of the drive gear represents a ring segment. The tangential outer wall of the feature is guided on the outer inner wall of the drive wheel. The radial wall of the shape abuts against the radial leg of the leaf spring. This applies not only when the geometry is engaged inside the u-shaped leaf spring but also when the u-shaped leaf spring is engaged between the u-shaped leaf spring. Good torque transmission is achieved with less wear through the wide contact surface between the radial wall and the leg.

It is advantageous when the leaf spring consists of a plurality of layers which are for example pressed into one another or folded integrally. This allows the leaf spring to accept essentially high torques, while the torque is further damped through internal friction between the leaf spring layers. This also effectively prevents self-oscillation in the event of occurrence of unwanted noise (as is known in pressure springs).

In a preferred configuration, at least two leaf springs are coupled to each other. Reducing component parts enables simple assembly and saves manufacturing costs. For example, if six u-shaped leaf springs are joined together at their backs and the backs surround the entire hub, for example there will be only one leaf spring component folded from one piece. This structure also prevents leaf springs from being avoided in the dorsal region, so that support at the hub is not necessarily required.

The embodiment where the drive wheel and the drive gear are separated allows the material to be optimized for each part corresponding to its operating conditions. Thus, for example, the material of the drive wheel driven by a worm on the motor shaft advantageously comprises a synthetic resin, such as POM, that is suitable for sliding and durable. Since the drive gear must be sealed to the bearing shaft and the housing, materials with a low coefficient of thermal expansion are particularly suitable for this purpose.

The manufacturing method according to the invention of the component adjustment device according to the preceding claims has the advantage that the drive wheel and the drive gear are separately injection molded corresponding to their material requirements. It is particularly advantageous for the manufacture of leaf springs to drill one piece of steel sheet and to fold it into the corresponding shape through folding. Advantageously, an assembly matrix is used in which the leaf spring is threaded into a tapered guide track and then pressed into the drive wheels for the assembly of the leaf spring under internal stress. This method allows simple and reliable assembly of the internally stressed leaf spring, since the drive gear is pressed in a separate work step.

In the drawings two embodiments of a device according to the invention are shown and described in detail below.

1 shows, as an embodiment of the device according to the invention, a gear selection motor 10 which forms a lateral movement of the H-circuit in an automatic gear transmission. The gear selection motor 10 is not shown in detail of the vehicle, which detects the gap with respect to the channel wall of the input gear stage through the drive gear 12 and through the left and right movement with the limited torque in the state of the gear input. Adjust the gear cogwheel. In order to realize the short adjustment time required for the gear shift, the gear selection motor 10 should be designed to have high rotational speed and high torque. To this end, a drive wheel 16 mounted on the solid shaft 14 is driven by a worm gear 18 arranged on the rotor shaft 20 of the electric motor, not shown in detail. The shape 22 of the drive gear 24, which transmits torque through the internal teeth 26 to the drive gear 12, engages with the drive wheel 16. The drive gear 26 is connected to the housing 34 of the gear selection motor 10 at its radial wall 32 by means of a radial seal 28 against the solid shaft 14 and by another seal 30. It is sealed against. The drive gear 24 is made of a full synthetic resin with a low coefficient of thermal expansion, which ensures a tight seal on the solid shaft 14 and the housing 34 over a wide temperature range. On the other hand, the drive wheel 16 is made of POM to be optimally engaged with the worm gear 18.

In order to damp the torque, six u-shaped leaf springs 36 are arranged on the drive wheel 16, each comprising two legs having a dorsal portion 38 and a free end 42. The dorsal portion 38 abuts the hub 44 formed close to the drive wheel 16 and is prevented from radial movement by the support pins 46. In the embodiment six support pins 46 are distributed on the bottom 48 of the drive wheel 16 and the back portion 38 of the leaf spring 36 is sandwiched between the support pins 46 and the hub 44. have.

2 shows the structure of the leaf spring 36 inside the drive wheel 16 in a cross-sectional view. The six, shape 22 of drive gear 24 is engaged between u-shaped leaf springs 36. The cross section of the feature 22 represents a ring transition 50, with the outer wall 52 of the feature 22 being guided along the outer inner wall 54 of the drive wheel 16. The radial wall 56 of the feature 22 abuts the radial leg 40 of the leaf spring 36 generally for torque transmission. The outer inner wall 54 of the drive wheel 16 comprises a space portion 58 into which the free end 42 of the leaf spring 36 engages. The u-shaped leaf springs 36 are pressurized with internal stresses so that the free ends 42 abut the side portions 60 of the space portion 58, while the opposing side portions 62 are in turn of the leaf springs 36. The stop face 64 is formed. The gear selection motor 10 via the leaf spring 36 includes a torsional elasticity that dampens the torsion of the drive wheel 16 relative to the drive gear 24. This torsional elasticity is generated from a predetermined limit torque by the internal stress of the leaf spring 36. If the gear cogwheel is moved against an obstacle (channel wall), relative movement between the drive cogwheel 24 and the drive wheel 16 does not occur up to a limited limit torque. This detection intensity is important for detecting the position of the gear cogwheel. The limit torque is set via the internal stress of the leaf spring 36. The internal stress depends on the deformation of the leaf spring 36 and the relative position of the space 58. When the load increases above the limit torque, the damping action is caused by the torsional elasticity. The drive gear 24 is twisted with respect to the drive wheel 16 until the free end 42 of the leaf spring 36 abuts against the stop face 64 of the drive wheel 16. At this time, rotation energy attenuation occurs. As the load moment increases further, the drive gear 24 and the leaf spring 36 are no longer twisted with respect to the drive wheel 16 to prevent damage or overload of the leaf spring 36.

In a variant embodiment, for example three u-shaped leaf springs are folded from one piece. The support pin 46 prevents the leaf spring 36 in the space portion 58 from being tilted incorrectly. This ensures that there is a small gap between the free end 42 of the leaf spring 36 and the contact wall 59 of the space portion 58 and that the gap is maintained through the support pin 46. As a variant, however, in particular, for example, if all six u-shaped leaf springs 36 are integrally connected to one another and their common dorsal portion 38 surrounds the hub 44 as a whole, the support pins 46 may be abandoned. Can be. If the support pin 46 is abandoned, it makes sense to be careful that the end 42 and the space portion 58 of the leaf spring 36 are not formed with squared edges. The width 66 of the feature 58 may be selected corresponding to the allowable relative movement between the drive gear 24 and the drive wheel 16. In another variant, the feature 58 'is wide so that both legs 40 of the leaf spring 36 abut both side portions 60, 62 under internal stress, respectively. The side portion 60, which abuts one leg under internal stress, simultaneously forms a stop face 64 for the opposite leg. The mode of operation of the elastic damping is the same in both turning directions. The shape 68 of the drive wheel 16 shown in FIG. 2 is a fabrication condition and should prevent deformation of the drive wheel 16 when cooled after the injection process. The shape 68 is not critical for the function of the present invention and may be omitted herein. The leaf spring 36 comprises two layers, which are folded from one piece as in the case of the embodiment of the leaf spring 36 which is pressed or interconnected to each other. Leaf springs 36 may include two or more layers for more attenuating embodiments.

3 shows another embodiment of the device according to the invention, shown similarly to FIG. Various modifications of the leaf spring 36 are shown in this figure. As the pressurized u-shaped leaf spring 36 of Fig. 2, for example, the v-shaped leaf spring 70 is opened with both legs 40, and internal stress is applied, and both ends 42 have internal stress. The other side parts 62 and 60, respectively. The exact shape of the leaf spring 36 (v-shaped or u-shaped) is not important for the selection of internal stresses (opening or compressing the ends). This also requires fixing by the support pins, depending on the construction. In this embodiment the drive gear 22 engages into the leaf spring 70, not between the leaf springs 36. The damping operation is the same as that of FIG. After the internal stress moment is overcome, the leg of the leaf spring 70 is moved through the drive gear 22 until the stop face 64 is implemented at the opposite side portion 62 of the space 58. With this structure attenuation in both directions is likewise realized. In another embodiment the leaf spring 72 includes only one leg 40. The back part of the leaf spring 72 is here secured to the support pin 46 against the hub 44 to prevent internal stress and is prevented from torsion. In order to enable attenuation in both swing directions, the legs of the leaf spring 72 abut the side portion 60 and in the case of the next leaf spring 72 abut the opposite side portion 60 '. In another variant, one leg spring 74 is pressed directly into the shape 78 of the hub 44 or injected into the shape 78 (under internal stress). This prevents the hub side end of the leaf spring 74 from turning and prevents radial and tangential displacements. The manner of operation of the attenuation is the same as in the case of the leaf spring 72.

In other embodiments, kinematic reversal of the devices described so far is possible. The drive then takes place via a drive gear 24 which can be integrally formed with the drive gear 12; The torque is then reduced at the drive wheel 16. Leaf spring 36 may likewise be fixed to drive gear 24. Embodiments are also possible in which the leaf spring is pressurized by internal stress when mounting the drive gear 24 to the drive wheel 16. In another variant, the dorsal portion 38 of the leaf spring 36 is supported at the outer inner wall 54 of the drive wheel 16 and the free end 42 of the leaf spring 36 is provided with a space portion within the hub 44. 58). In order to achieve a better packing density of the leaf spring 36 to accommodate higher torque, the free end 42 of the leaf spring 36 is connected to the hub 44 and to the outer inner wall 54. Can be arranged alternately.

However, the embodiment in which the leaf spring 36 is pre-assembled into the drive wheel 16 under internal stress is preferred, since such a device can be manufactured particularly simply. Here, the drive wheel 16 and the drive gear 24 are each injection molded from industrial materials according to their unique use. The leaf spring 36 is perforated from a steel sheet and in multiple layers, in some cases, a plurality of u-shaped leaf springs 36 are folded in parallel through the dorsal portion 38. The leaf spring 36 is then threaded into the assembly matrix and pressed into the drive wheel 16. The assembly matrix comprises tapered guide tracks, such that the legs 40 of the leaf spring 36 are fixed (opened or compressed) when pressed and inserted into the space 58. When assembled, the leaf spring 36 is prevented from falling out through internal stresses, so that the drive gear 24 can be inserted without problems in succession between or in the leaf springs 36.

The present invention is not limited to the gear selection motor 10, but is applied to each adjustment process in which high torque has to be effectively attenuated in a small structure space, and high, precisely defined torque of internal stress in both directions is required.

As mentioned above, the present invention has the effect of creating an attenuation of the adjusting device that can accommodate the generated high torque in a very compact structure.

1 is a cross-sectional view of a device according to the invention.

2 is a cross-sectional view of a drive wheel with an inserted drive cogwheel, according to line II-II.

3 is another embodiment according to the illustration of FIG.

<Explanation of symbols for the main parts of the drawings>

10: gear selection motor

12: drive gear

14: Solid shaft

16: drive wheel

18: worm gear

20: rotor shaft

24: Driving gear

26: internal teeth

28: Hermetic ring

30: Hermetic

32: radial wall

34: housing

36: leaf spring

38: The back part

46: support pin

Claims (13)

And a drive wheel 16 and a drive gear 24, supported by the drive wheel 16 between the drive wheel 16 and the drive gear 24 and having at least one shape of the drive gear 24. In the control device of a part, in which at least one spring element 36 cooperating with 58 is arranged, in particular, such as the selection motor 10 in an automatic gear transmission, The spring element (36) is characterized in that it is formed as a leaf spring (36) and is preferably arranged radially. The drive wheel 16 according to claim 1, at least for the leaf spring 36, which limits the torsion of the leaf spring 36 when the drive gear 24 is moved relative to the drive wheel 16. And a stop surface (64). 3. The leaf spring (36) according to claim 1 or 2, wherein the leaf spring (36) generates torsional elasticity between the drive wheel (16) and the drive gear (24), the torsional elasticity caused by the internal stress of the leaf spring (36). And the device is generated from a predetermined limit torque in accordance with the internal stress. The hub according to claim 1 or 2, wherein the leaf spring (36) comprises a back portion (38), by which the leaf spring (36) is formed proximate the drive wheel (16). An apparatus characterized by being supported by (44). Device according to claim 1 or 2, characterized in that the leaf spring (36) is at least radially fixed by at least one support pin (48). Device according to claim 1 or 2, characterized in that the leaf spring (36) comprises two legs (40) fixed relative to each other in an assembled state. 3. The drive wheel (16) according to claim 1 or 2, characterized in that the drive wheel (16) comprises an outer inner wall (54) formed with at least one space portion (58) in which the end (42) of the leaf spring (36) is engaged. Device. The space portion 58 comprises two opposing side portions 60, 62 and an end 42 of the leaf spring 36 is in contact with the one side portion 60 under internal stress and the opposing side portion ( 62 is characterized in that it forms a stop face (64) for the leaf spring (36) when the drive gear (24) is twisted with respect to the drive wheel (16). 3. The shape 58 of the drive gear 24 comprises a generally ring-shaped cross-section 50 with a radial wall 56 in contact with the leaf spring 36. Device characterized in that. Apparatus according to claim 1 or 2, characterized in that the leaf spring (36) consists of a plurality of respective layers. Apparatus according to claim 1 or 2, characterized in that at least two leaf springs (36) are joined to one another in the region of their dorsal part (38). The material of claim 1 or 2, wherein the material of the drive wheel 16 comprises a synthetic resin, particularly POM, which is suitable for sliding and the drive gear 24 is made of a material having a low coefficient of thermal expansion, in particular a full synthesis An apparatus comprising a resin. The drive wheel 16 is injection molded; Drive gear 24 is injection molded; At least one leaf spring 36 is divided into pieces and made into a predetermined shape; At least one leaf spring (36) is threaded by an assembly matrix comprising tapered guide tracks and pressed into the drive wheel (16) under internal stresses. .