EP2912348A1

EP2912348A1 - Conical friction ring transmission

Info

Publication number: EP2912348A1
Application number: EP13805241.0A
Authority: EP
Inventors: Ulrich Rohs
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-10-29
Filing date: 2013-10-29
Publication date: 2015-09-02
Also published as: JP6497628B2; CN108412991A; DE102012021171A1; CN104769324A; DE112013005174A5; US20160069436A1; US9719582B2; JP2015532970A; WO2014067509A1

Abstract

In a conical friction ring transmission, the safety device may have a normal state, in which electrical energy is applied to the safety device, and a failure state, in which the safety device is free of electrical energy, or a bi-stable safety actuator with a normal position and a failure position, and may change the effect parameter of a mechanical articulating element for adjusting a friction ring. An especially compact design of the conical friction ring transmission is thus achieved.

Description

bevel friction ring gearing

[Ol] The invention relates to a conical-friction ring transmission with two cones spaced apart from each other by a gap and with a friction ring which rubs frictionally with the cones and which is displaceable axially by an adjusting means acting on the friction ring via guide elements. wherein the adjusting means comprise an adjusting device controllable via an adjusting drive with a first actuator and a securing device with a second actuator, which adjusts the friction ring in a safety career in case of failure of the controllable adjusting device.

Such conical friction ring transmissions are known, for example, from WO 2004/031622 A1 or from WO 2006/012892 A2, wherein these conical friction ring transmissions are relatively expensive, in particular with regard to their safety device, or are mechanically operated by springs or the like and thus dispensing with a second actuator Safety devices are provided. The latter are also disclosed, for example, in JP 2010-151 186 A1, EP 1 729 037 A1 and US Pat. No. 3,195,365. The DE 10 2010 025 007 AI provides a purely mechanical security concept due to a mechanical feedback before. Also DE 1 1 201 1 100 163 T5 and DE 10 2010 025 027 AI do not disclose a separate securing device or a second actuator for any safety aspects with respect to the position of the friction ring.

[03] It is an object of the present invention to provide a safety device which is as simple as possible in the case of generic conical friction ring gears. As a solution, a conical friction ring transmission with the features of claims 1, 6 and / or 9 with the common parent basic idea to intervene controllable by an actuator constructed as simple as possible in the adjustment proposed. Further advantageous embodiments can be found in the subclaims and the following description.

Thus, a conical-friction ring gear is relatively inexpensive when the safety device comprises a normal state in which it is exposed to electrical energy, and a failure state in which it is free of electrical energy, and in the case of failure of the controllable adjusting device from the normal state in the Failure state passes. With a suitable embodiment, it is then possible to have a separate power supply, which ensures proper functionality of the safety device as well

CONFIRMATION COPY ensured in case of power failure, be waived, which provides in particular for a little expensive to build conical friction ring gear.

[05] Preferably, the securing device comprises an electrical converter which converts into mechanical energy as an actuator and an element biased by the converter in the normal state, such as a spring, wherein the prestressed element has no operative connection to the controllable adjusting device in the normal state and in the default state in prestressed operative connection with the controllable adjusting device. Due to the operative connection in the prestressed state, the prestressed element can then act in the state of failure on the controllable adjusting device in such a way that the friction ring is adjusted into the safety track. Although this embodiment has the disadvantage that the converter is supplied in the normal state with electrical energy to work against the biased element and bias this, so that the energy consumption increases. With a suitable embodiment of this arrangement, however, this additional energy consumption can be limited to a minimum. [06] A corresponding conical-friction ring transmission is particularly energy-saving if the converter comprises one electromagnet as one of two relatively movable assemblies, and as another of the two relatively movable assemblies a correspondingly movable by the magnet, preferably a ferromagnetic component. In particular, the converter may also have an associated armature. Although such an arrangement initially requires relatively much energy to get from the normal state to the failure state. In the case of a suitable shaping of the corresponding assemblies, however, the magnetic field lines can be concentrated in the normal state in such a way that a significant reduction in the energy consumption in the normal state is possible and yet the two components that are movable relative to one another clamp the prestressed elements. Then, if the electrical energy is no longer supplied to the magnet, then relaxes the biased element and can act with its remaining bias on the controllable adjusting device.

Accordingly, it is advantageous for the converter to have two assemblies that are movable relative to one another, which in the normal state are acted upon by the converter with a force due to the electrical energy against the bias of the prestressed element. [08] The overall arrangement is particularly compact when arranged both with the two mutually movable assemblies of the transducer cooperating areas of action of the prestressed element, such as both ends of a corresponding spring, and / or both mutually movable assemblies of the transducer to a mechanical coupling element of the controllable adjusting device are. Such an articulation element, such as a link rod, is often present in a conical friction ring gear anyway, so that hardly any additional space is required for the safety device.

[09] The overall arrangement is particularly compact when both the two mutually movable assemblies of the transducer and the cooperating with the two mutually movable assemblies of the transducer areas of action of the biased element are arranged on the mechanical coupling element of the controllable adjusting device.

The conical friction ring gear also builds relatively inexpensive, when the safety device comprises a bistable safety actuator with a normal position and a failure position. Such bistable safety actuators are relatively small due to the design, especially since several positions to be taken, which also require more space, or complex control or control mechanisms are missing, which in actuators with several stable positions, such as this example, rotary electric drives, stepper motors or complex gear arrangements are not necessary.

[11] A bistable fuse actuator can be realized particularly compactly in concrete terms if it comprises an electromagnet and a biased element operating against the electromagnet, such as a spring.

[12] A conical-friction ring transmission is also particularly inexpensive if the safety device comprises a mechanical articulation element of the controllable adjusting device and if the controllable adjusting device fails, changes the effective size of the mechanical articulation element between the adjusting drive and the guide elements. In this way, it can be ensured in a suitable embodiment that the securing device ultimately acts on the guide elements of the friction ring via the same components, such as the mechanical coupling element.

In particular, the safety device can change the effective length of a connecting rod of the controllable adjusting device in the event of failure of the controllable adjusting device, if this effective length is the effective size of the mechanical coupling element. For example, by a bistable actuator can be in a particularly compact manner a connecting rod extend, in which a length variability of a corresponding bistable actuator, which is set directly into the connecting rod, is used accordingly.

[14] But even with rotating Anlenkgliedern a bistable actuator, which can accordingly move between two rotational positions back and forth, be used to change the effective size.

In particular, in contrast to the EP 1 729 037 AI, the securing device acting on the adjusting drive and the guide elements mechanical articulation members, such as acting on a between the adjusting drive and the guide elements articulation rod or on corresponding between the adjusting drive and the Guide elements acting rotating coupling links, such as Gears and the like, act. This allows in particular a structurally simple and therefore also compact suspension of the corresponding adjustment drive, which is usually much more complex and heavier than an actuator of the securing device.

[16] Preferably, the securing device has a stop, by which, for example, the safety track is defined. Likewise, the stop can be used to keep the prestressed element according to lead or biased.

Preferably, the controllable adjusting device comprises an axially freely displaceable in a cage adjusting bridge, which is controllable via a link, such as a link rod, an articulation lever or a coupling element, by means of the adjusting drive and preferably carries the guide elements.

[18] For example, suitable rollers or sliding blocks or sliding surfaces can serve as guide elements.

[19] The friction ring preferably runs around one of the cones. In this case, it is in particular preferably arranged in the gap between the cones, as this allows in a very compact manner large contact forces between the cones and the friction ring.

[20] Ultimately, any motor or energy-converting device is preferably used as the adjusting drive. Although manual adjustment drives are conceivable, which will often be eliminated in motor vehicles for reasons of energy efficiency and convenience for the driver. [21] It is understood that the features of the solutions described above or in the claims can optionally also be combined in order to be able to implement the advantages in a cumulative manner.

[22] Further advantages, objects and features of the present invention will be explained with reference to the following description of exemplary embodiments, which are also illustrated in particular in the appended drawing. In the drawing show:

FIG. 1 shows a friction ring with adjusting bridge, cage, securing device and adjusting drive;

Figure 2 is a schematic section through the securing device of Figure 2; Figure 3 is a schematic representation of a conical-friction ring transmission, in which the

Arrangement according to Figures 1 and 2 can be used;

Figure 4 shows an alternative securing device in a similar representation as Figure 2; Figure 5 shows another alternative security device in a similar representation as

Figure 2; and

FIG. 6 shows a schematic plan view of a conical-friction-ring transmission with a safety device at another position.

[23] In the conical friction ring transmission 1 according to FIGS. 1 to 3, two cones 3 are spaced apart from each other by a gap 2, in which a friction ring 4 rubbing frictionally with the cones alternates around one of the cones 3.

Here, the friction ring 4 via guide elements 6 (exemplified), which are realized in this embodiment by small guide wheels, guided in a Verstellbrücke 19, which in turn is axially free, parallel to the gap displaced. The cage 18 is rotatably mounted in a conventional manner in a housing 23 about an axis parallel to a plane which is spanned by the axes of the cone 3, so that the friction ring 4 can be changed in its angle of attack with respect to the two cones 3. By such hiring the friction ring 4 moves along the gap 2, whereby the transmission ratio of the conical friction ring 1 can be varied in a conventional manner.

It is understood that the cage 18 does not necessarily have to guide the adjustment bridge 19 over two axes. Rather, a corresponding leadership also differently, for example, take place over only one axis with a suitable rotation lock. Likewise, the adjustment bridge 19 does not necessarily have to be designed as a bridge. In this respect, modified embodiments can be readily represented in this regard. It is also conceivable a conical-friction ring 1 to design such that the friction ring is positioned directly and not only employed in its angle, and then freely start its position by then the Verstellbrücke 19 follows the movement of the friction ring along the gap 2.

In order to make the cage 18 and thus also the friction ring 4 in its angle of attack, an adjusting drive 7 is provided, which is designed in this embodiment as a rotating stepping motor, which via an eccentric bushing 24, a link rod 16 and a Anlenker 20 and a Cage lever 25 acts on the cage 18.

Consequently, the adjusting bridge 19, the cage 18, the cage lever 25, the connecting rod 16, the eccentric bush 24 and the adjusting drive 7 in this embodiment, adjusting means 5, by means of which the friction ring 4 can be displaced along the gap 2, wherein in this Embodiment, the displacement itself by the interaction of the friction ring 4 with the cones 3 takes place in dependence on the angle of the friction ring 4. The aforementioned assemblies of the adjusting means 5 also form a controllable adjusting device eighth

The adjusting means 5 further comprise a securing device 9, which is provided in this embodiment in the articulation rod 16 and next to the articulation rod 16, which forms a hinge element 15, nor a transducer 10 in the form of an electromagnet 22 and a biased element 1 first in the form of a spring 12 and an interacting with the magnet counterpart 26 comprises, which is pot-shaped in this embodiment, the spring 12 surrounds and is guided in a fuse housing 27.

Here, the electromagnet 22 and the counterpart 26 form two mutually movable assemblies 13, wherein the spring 12 and the prestressed element 1 1 with these two movable assemblies 13 on areas of action 14 together by this against the two mutually movable assemblies thirteenth pushes and, when the electromagnet 22 is supplied with electrical energy, is biased by the two mutually movable assemblies 13.

[30] In this case, the spring 12 is bounded by a stop 17 of the safety device housing 27, against which the counterpart 26 abuts when it reaches a predetermined distance from the electromagnets 22. This distance is dimensioned such that the connecting rod 16 is extended in its effective length such that operationally safe in each angular position of the adjusting drive 7 and the eccentric bushing 24 of the cage 18 in such is set to its angle that the friction ring 4 runs in his safety career. For this purpose, the connecting rod 16 is divided into two and on the one hand firmly connected to the magnet 22 and on the other hand fixed to the counterpart 26.

In the normal state, the electromagnet 22 is supplied with electrical energy, so that it draws the counterpart 26 to itself. As a result, the biased element 1 1 is stretched and the effective length of the connecting rod 16 is shortened. In the event of a failure, in particular, for example, the electrical energy, the solenoid 22 is de-energized, which of course can also be controlled accordingly, so that the spring 12 and the prestressed element 1 1 expands until the counterpart 26 reaches the stop 17 and the effective length of the Connecting rod 16 is increased accordingly. Also in this position, the biased element 1 1 remains under tension, so that the connecting rod 16 is a total of sufficient stiffness to reliably relocate the friction ring 4 in his safety career.

Optionally, a further stop may be provided, which again moves the cage 18 to a neutral position when the securing raceway has been reached, as a result of which the pretensioned element 11 is again compressed a little.

[33] The fuse housing 27 is formed as a sheet metal bushing and fixed in the region of the electromagnet 22 by means of tabs 28 on the magnet and the associated part of the connecting rod 16. In the other part of the articulation rod 16, the safety device housing 27 surrounds this part of the articulation rod 16 only, so that the latter can move conditionally with respect to the safety device housing 27 by the spring force or the magnetic force.

The arrangement of converter 10 with its two movable assemblies 13, so the electromagnet 22 and the counterpart 26, and the stop 17 forms a bistable fuse actuator 21 with a normal position and a default position between which the fuse actuator 21 unregulated running back and forth. It is understood that a corresponding running, for example, each at start in one direction, ie from the default position in the normal position, and the stop in the other direction, ie from the normal position to the default position, can be done by the latter Apply power to the backup actuator 21 by applying or not applying power. Incidentally, in an accident situation, accordingly, an uncontrolled transition to the default position can take place. [35] The safety actuators 21 shown in FIGS. 4 and 5 are also constructed accordingly and can accordingly be inserted into an articulation rod 16.

However, in the embodiments of Figures 4 and 5, the biased element 1 1 and the spring 12 is disposed within the electromagnet 22, whereby the overall arrangement is even more compact. Also, in these embodiments, the counterpart 26 is formed into the spring 12 and the electromagnet 22, so that it constitutes an armature 29 for the electromagnet 22. It is understood that instead of an anchor firmly connected to the fuse housing 27 or, for example, with the Anlenkstange 16 can be used when the counterpart 26 is formed only plate-like.

[37] In the case of all securing devices 9, if the assemblies 13 are close to each other, the field line course of the electromagnets 22 can be optimized such that only a minimum holding energy is needed, so that, if necessary, the energy supply can be throttled correspondingly with electrical energy. For the latter, the electromagnets 22 of the exemplary embodiments illustrated in FIGS. 4 and 5 are formed from two sets of turns, a radially inner set of turns and a radially outer set of turns, wherein the radially inner set of turns is sufficient in its dimensioning to hold the counterpart 26 in the normal state. while the radially outer winding set is only used when the counterpart 26 is to be transferred from the failure state or from its failure position in the normal state or in its normal position. In this respect, the outer Windungssatz is not supplied in the normal state with electrical energy, which can be easily saved according to energy.

For this purpose, the embodiments illustrated in Figures 4 and 5 each have electrical contacts 30, wherein in the embodiment shown in Figure 4, the electrical contacts 30 are closed when the arrangement is in a failure state. In the exemplary embodiments illustrated in FIG. 5, the electrical contacts 30 are closed when the arrangement is in the normal state. Here, in the embodiment of Figure 5, the circuit for the radially outer turns of the electromagnet 22 is disconnected when the armature 29 reaches the fuse housing 27. In the embodiment shown in Figure 4 on the other hand, the power supply can be made directly via the contacts 30, when the dimensioning is such that the magnetic energy remaining in the outer windings after cutting the electrical contacts 30 is sufficient to convert the once accelerated armature 29 to the normal position.

[39] A corresponding securing device 9, in particular a securing device 9 corresponding to FIGS. 4 and 5, does not necessarily have to be provided in an articulation rod 16 or an articulation element 15. Rather, it can also act directly on the cage 18, when it is mounted in a suitable position on the housing 23, as shown schematically in Figure 6.

LIST OF REFERENCE NUMBERS

Tapered friction ring drive 16 Connecting rod

Gap 17 stop

Cone 18 cage

Friction ring 20 19 Adjusting bridge

Adjustment means 20 linkage

Guide element 21 Safety actuator

Adjustment drive 22 electromagnet

controllable adjusting device 23 housing

Safety device 25 24 Eccentric bushing

Converter 25 cage lever

biased element 26 counterpart

Spring 27 fuse housing

Assembly 28 tab

Effective range 30 29 anchors

Connecting element 30 electrical contact

Claims

Patent claims:

1. Bevel friction ring gear (1) with two cones (3) spaced apart by a gap (2) and with a friction ring (4) which interacts with the cones (3) and which is mounted by means of adjusting means (5) via guide elements (6). the friction ring (4) act, is arranged to be displaceable axially along the gap (2) by an adjustment path, the adjusting means (5) having an adjusting device (8) which can be controlled via an adjusting drive (7) and has a first actuator and a safety device (9). a second actuator which, if the controllable adjustment device (8) fails, moves the friction ring (4) into a safety track, characterized in that the safety device (9) has a normal state in which it is supplied with electrical energy and a failure state, in which it is free of electrical energy, and changes from the normal state to the failure state if the controllable adjustment device (8) fails.

2. Bevel friction ring gear (1) according to claim 1, characterized in that the securing device (9) has a converter (10) which converts electrical energy into mechanical energy and an element (11) preloaded by the converter (10) in the normal state, in particular a spring ( 12), which in the normal state has no operative connection to the controllable adjustment device (8) and in the failure state is in a preloaded operative connection with the controllable adjustment device (8).

3. Bevel friction ring gear (1) according to claim 2, characterized in that the converter (10) has two mutually movable assemblies (13), which in the normal state are preloaded by the converter (10) with a force caused by the electrical energy against the preload of the preloaded Elements (1 1) are applied.

4. Bevel friction ring gear (1) according to claim 3, characterized in that both effective areas (14) of the prestressed element (1 1) interacting with the two mutually movable assemblies (13) of the converter (10) and/or both Mutually movable assemblies (13) of the converter (10) are arranged on a mechanical articulation element (15) of the controllable adjusting device (8).

Conical friction ring gear (1) according to claim 4, characterized in that the articulation element (15) is an articulation rod (16).

Bevel friction ring gear (1) with two cones (3) spaced apart by a gap (2) and with a friction ring (4) which interacts with the cones (3) and which is mounted on the friction ring by means of adjusting means (5) via guide elements (6). (4) act to be displaceable axially along the gap (2) by an adjustment path, the adjusting means (5) being an adjusting device (8) which can be controlled via an adjusting drive (7) and having a first actuator and a safety device (9) having a second Actuator include, which adjusts the friction ring (4) into a safety raceway if the controllable adjustment device (8) fails, characterized in that the safety device (9) comprises a bistable safety actuator (21) with a normal position and a failure position.

Bevel friction ring gear (1) according to claim 6, characterized in that the safety actuator (21) runs uncontrolled between the normal position and the failure position.

Bevel friction ring gear (1) according to claim 6 or 7, characterized in that the safety actuator (21) comprises an electromagnet (22) and a prestressed element (1 1), in particular a spring (12), working against the electromagnet (22).

Bevel friction ring gear (1) with two cones (3) spaced apart by a gap (2) and with a friction ring (4) which interacts with the cones (3), which is operated by means of an adjusting means

(5), which has guide elements

(6) act on the friction ring (4) to be displaceable axially along the gap (2) by an adjustment path, the adjusting means (5) being via an adjusting drive

(7) controllable adjustment device (8) with a first actuator and a safety device (9) with a second actuator, which in the event of failure of the controllable adjustment device

(8) the friction ring (4) is adjusted into a safety track, characterized in that that the security device

(9) comprises a mechanical articulation element (15) of the controllable adjustment device (8) and, if the controllable adjustment device (8) fails, the effective size of the mechanical articulation element (15) between the adjustment drive (7) and the guide elements (6) changes.

10. Bevel friction ring gear (1) according to claim 9, that the safety device (9) changes the effective length of a link rod (16) of the controllable adjusting device (8) as the effective variable of the mechanical link element (15) in the event of failure of the controllable adjusting device (8).

1 1. Cone friction ring gear (1) according to one of the preceding claims, that the securing device (9) has a stop (17).

12. Bevel friction ring gear (1) according to one of the preceding claims, in that the controllable adjusting device (8) comprises an adjusting bridge (19) which can be axially freely displaceable in a cage (18) and which can be controlled via an armature (20) by means of the adjusting drive.

13. Bevel friction ring gear (1) according to claim 12 and claim 5 or 10, characterized in that the link (20) is the link rod (16).

14. Bevel friction ring gear (1) according to one of the preceding claims, that the securing device (9) acts on mechanical articulation members acting between the adjusting drive (7) and the guide elements (6), such as one between the adjusting drive (7) and the guide elements (6 ) acting link rod (16), works.