Abstract:
The rotary/push operating device ( 10 ) for a human-machine interface, in particular for a vehicle component, such as an air conditioning system, is provided with a rotary/push operating element ( 12 ) that can be rotated about a guide shaft ( 14 ) in a rotary movement and moved axially along the guide shaft ( 14 ). Furthermore, the rotary/push operating device ( 10 ) has a rolling bearing unit ( 30 ) having an outer bearing ring ( 32 ), an inner bearing ring ( 34 ) and rolling elements ( 36,38 ) arranged therebetween, wherein one of the bearing rings ( 32, 34 ) is connected with the rotary/push operating element ( 12 ) in a rotationally fixed manner and can be rotated therewith.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a national stage filing of PCT application PCT/EP2012/069037 to Fust et al., filed Sep. 27, 2012, entitled “Rotary/Push Operating Device for a Human-Machine Interface, ” which claims priority to German patent application number 10 2011 083 524.5 filed on Sep. 27, 2011, both of which are incorporated herein by reference. 
     FIELD OF INVENTION 
     The invention relates to a rotary/push operating device for a human-machine interface, in particular for an operating device of a vehicle. 
     BACKGROUND OF THE INVENTION 
     Rotary/push operating devices for data input via a so-called human-machine interface in a vehicle and/or for operating units of a vehicle are known in prior art. Normally, a rotary/push operating device is provided with a rotary/push operating element. By rotating the rotary/push operating element letters, signs or functions are selected and acknowledged by pressing said element. After acknowledgement of such an input a task corresponding to the input is performed. 
     From DE-A-102 61 284 a rotary operating element is known which is adapted to be moved along its rotary axis when a force acts upon said element. This operating element comprises a toothed portion which is in engagement with a gear wheel to transmit the rotation of the operating element to the gear wheel. The rotary axis of the gear wheel is arranged in parallel to and sideways of the rotary axis of the operating element. This measure allows the operating element to be moved along its rotary axis. The toothed portion itself preferably forms a gear wheel such that a full rotation of the operating element is possible. 
     Further, in prior art, rotary/push operating devices are known where the rotary/push operating element comprises a central key or a plurality of central keys normally secured against rotation which are arranged inside the rotatable rotary element. These keys are adapted to be depressed and serve for data input and/or acknowledgement of data input. However, the rotary operating element itself is not adapted to be depressed. Examples of the above described prior art rotary/push operating devices are disclosed in DE-A-10 2006 018 518, DE 10-A-2004 054 178, DE-A-199 64 131, DE-A-101 37 883, EP-B-0 282 817 and GB-A-2 186 668. 
     SUMMARY OF THE INVENTION 
     It is an object of the invention to provide a rotary/push operating device for a human-machine interface, wherein the rotary/push operating device has a simple design insusceptible to faults for moving a rotary/push operating element in two orthogonal directions. 
     To achieve this object the invention proposes a rotary/push operating device for a human-machine interface, in particular for a vehicle component, such as an air conditioning system, wherein the rotary/push operating device is provided with
         a rotary/push operating element which is adapted to be rotated in a rotary movement and to be axially moved along the guide shaft,   a roller bearing unit having an outer bearing ring, an inner bearing ring and rolling bodies arranged therebetween,   wherein one of the bearing rings is connected in a rotationally fixed manner with the rotary/push operating element and is adapted be rotated therewith,   a rotation sensor for sensing the rotary movement of the operating element,   a pressure sensor responding to an axial movement of the rotary/push operating element from a starting position into a depressed position along the guide shaft, and   a return element for automatically moving back the rotary/push operating element from the depressed position into the starting position,   wherein the return element directly or indirectly acts upon the roller bearing unit, and   wherein the other one of the bearing rings ( 32 ,  34 ) is adapted to be guided in an axially movable manner along the guide shaft ( 14 ) and is secured against rotation at the guide shaft.       

     Here, it may further be provided for
         a rotary arresting unit to be arranged between the inner bearing ring and the outer bearing ring or between a first component mechanically coupled with the inner bearing ring and a second component mechanically coupled with the outer bearing ring,   wherein the rotary arresting unit includes an arresting template provided with arresting recesses and at least one arresting projection moving into and out of one of the arresting recesses,   wherein the arresting template and the at least one arresting projection are adapted to be moved relative to each other, and   wherein the arresting template and/or the at least one arresting projection is/are adapted to be elastically moved or deformed.       

     The rotary/push operating device according to the invention comprises a rotary/push operating element which is supported in a manner rotatable about a rotary axis by means of a rolling bearing unit. Further, the rotary/push operating element is adapted to be axially moved along the guide shaft. The rolling bearing unit comprises an outer bearing ring and an inner bearing ring. Therebetween rolling bodies are arranged. One of the two bearing rings (typically the outer bearing ring) is connected with the rotary/push operating element such that the outer bearing ring is rotated together with the rotary/push operating element when the latter is rotated. The other bearing ring (typically the inner bearing ring) is guided in an axially movable manner along a fixed guide shaft forming the rotary axis and is secured against rotation at the guide shaft. The rotary movement of the rotary/push operating element is sensed by a rotation sensor (an absolute or relative path sensor, for example). Here, an optical sensor in the form of a light barrier or the like or a mechanical sensor in the form of a rotary potentiometer which meshes with the rotary/push operating element or is in rotary connection therewith, for example, is an appropriate choice. Other configurations of rotation sensors are also conceivable. A pushing movement of the rotary/push operating element is detected with the aid of a pressure sensor which responds to depressing of the rotary/push operating element along the guide shaft from a starting position to a depressed position. Such a pressure sensor in its simplest form can be configured as a (end) switch. The automatic return movement of the rotary/push operating element from the depressed position into the starting position is effected by a return element. According to the invention, this return element directly or indirectly acts upon the rolling bearing unit such that the overall rolling bearing and thus the rotary/push operating element are depressed when a depressing force is centrally exerted on the rotary/push operating element, for example. 
     Alternatively or additionally to the translatory movability of the rolling bearing unit, the rotary/push operating device according to the invention may comprise a rotary arresting unit which is arranged between the inner bearing ring and the outer bearing ring or between a first component mechanically coupled with the inner bearing ring and a second component mechanically coupled with the outer bearing ring. The rotary arresting unit comprises an arresting template having arresting recesses and at least one arresting projection adapted to be moved into and out of one of the arresting recesses. The arresting template and the at least one arresting projection are adapted to be moved relative to each other. The arresting template and/or the at least one arresting projection are adapted to be elastically moved or deformed. 
     According to a preferred aspect of the invention, the return element acts directly or indirectly on the inner bearing ring of the rolling bearing unit. Here, it may be advantageously provided for the return element to comprise a coil spring. In this connection one or a plurality of return elements may directly or indirectly act upon the rolling bearing unit. 
     Typically, the rotary/push operating element is of an essentially cap-shaped configuration and has a front side and a circumferential side. The rotary/push operating element appropriately comprises at the front side a fixed key body and at the circumferential side a ring element adapted to be rotated about the key body, wherein the key body is directly or indirectly connected with the inner bearing ring, and the ring element is directly or indirectly connected with the outer bearing ring of the rolling bearing unit. 
     If in a thus configured rotary/push operating element the fixed key body, i. e. the front side of the cap-shaped rotary/push operating element, is depressed, the overall rotary/push operating element moves downwards together with the rotatable ring element. In the same way, the fixed key body moves downwards when a depressing force is exerted on the ring element of the rotary/push operating element, for example. 
     For mechanical stabilization of the rotary/push operating element the rolling bearing unit appropriately comprises two rows of rolling bodies axially spaced apart from each other along the guide shaft. 
     The concept according to the invention allows a rotary/push operating device requiring a minimum installation space to be realized. The device can be realized with a rolling bearing made of a plastic material, namely plastic inner and outer bearing rings. In such a design either the rotary haptics production (e. g. the arresting) or the translatory guiding or both may be integrated. Thus in the case of rotary operating devices with small diameters all the desired mechanical functions can be realized, wherein, at the same time, sufficient space remains for arranging a fixed push button in the center of the rotary/push operating device, for example. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Hereunder the invention is explained in detail on the basis of an exemplary embodiment and with reference to the drawings in which: 
         FIG. 1  shows a longitudinal section of a rotary/push operating device according to an exemplary embodiment of the invention, 
         FIG. 2  shows a cross sectional view taken along the plane II-II in  FIG. 1 , 
         FIG. 3  shows the rotary/push operating device of  FIG. 1  with an indicated line of flux when a depressing force is exerted on the center of the rotary/push operating device, and 
         FIG. 4  shows the rotary/push operating device of  FIG. 1  with an indicated line of flux when a depressing force is exerted on the edge area of the rotary/push operating device. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  schematically shows the setup of a rotary/push operating device  10 . This operating device  10  comprises a rotary/push operating element  12  which is rotatably supported about a guide shaft (rotary axis)  14  defined by a hollow shaft. The guide shaft  14  extends upwards from a carrier plate  16  which normally is a circuit board. A front panel  18  of a housing  20  of the rotary/push operating device  10  is arranged in spaced relationship to the carrier plate  16  and surrounds the rotary/push operating element  12 . 
     In the front panel  18  a generally round cavity  22  is formed through which the rotary/push operating element  12  extends upwards. 
     The rotary/push operating element  12  comprises a cap-shaped upper operating part  24  adapted to be manually gripped and including a central fixedly arranged key body  26  and a rotatable ring element  28  surrounding said key body  26  and being provided with a knurled outer (gripping) face, for example. The key body  26  can only be depressed together with the ring element  28  and is secured against rotation, i. e. does not rotate together with the ring element  28 . Thus the key body  26  can be used as a fixed symbol-type or touch-type or the like data input field which does not co-rotate. 
     In this exemplary embodiment, the rotary/push operating element  12  further comprises a rolling bearing unit  30  including an outer bearing ring  32 , an inner bearing ring  34  and two groups of rolling bodies  36 ,  38  arranged therebetween. 
     The ring element  28  of the operating part  24  is fixedly connected with the outer bearing ring  32  such that the latter is rotated when the ring element  28  is rotated. The inner bearing ring  34  is secured against rotation and arranged in an axially guided manner at the guide shaft  14 . 
     Below the rotatable outer bearing ring  32  a circular rotating assembly  40  is located which cooperates with a light barrier as a rotation sensor  42 . The circular rotating assembly  40  is rotated when the ring element  28  is rotated, and the light barrier, i. e. the rotation sensor  42 , detects the amount of rotary movement. The circular rotating assembly  40  may additionally provide a light guide function for optical indication at the ring element  28 . Further the circular rotating assembly  40  may be provided with a toothing to actuate a rotary potentiometer as a rotation sensor and/or a three-way sensor (instead of a light barrier), for example. The rotary movement of the rotary/push operating element  12  can alternatively be sensed by a Hall sensor, for example. 
     As can be seen in  FIGS. 1 and 2 , inside the area of the inner bearing ring  34 , which axially protrudes beyond the guide shaft  14 , an insert sleeve  44  expanded in upward direction and providing a reflector function, for example, is inserted. This insert sleeve  44  carries the fixed key body  26 . The insert sleeve  44  is supported via two (e. g. for reasons of symmetry) return springs  46  opposite the carrier plate  16 . At the carrier plate  16  a pressure sensor  50  is located in the area occupied by the insert sleeve  44 , said pressure sensor  50  being configured as a limit switch and actuated by a projection  48  formed at the insert sleeve  44  in this exemplary embodiment. 
     When the rotary/push operating element  12  is depressed the springs  46  are compressed and the pressure sensor  50  is actuated. Once the depressing force is removed, the return springs  46  move the rotary/push operating element  12  back into the position shown in  FIG. 1 . 
     It should be mentioned here that other positions for the pressure sensor, the return springs and the pressure sensor are also feasible. For example, the return springs  46  could directly engage with the inner bearing ring  34 . In the illustrated exemplary embodiment, the return springs  46  engage with an element rigidly connected with the inner bearing ring  34 , namely the insert sleeve  44 . 
     In particular, as can be seen in  FIG. 2 , a rotary arresting unit  52  comprising an arresting template  54  with alternatingly successively arranged (arresting) recesses  56  and raised portions  58  and, e. g. for reasons of symmetry, two spring-elastic arresting projections  60  is located between the inner bearing ring  34  and the circular rotating assembly  40  connected with the outer bearing ring  32 . In this exemplary embodiment, the arresting template  54  is formed on the outside  62  of the inner bearing ring  34  (or a component arranged thereon) facing the circular rotating assembly  40 , while the arresting projections  60  are retained at the circular rotating assembly  40 . The arresting projections  60  may further be directly retained at the outer bearing ring  32 . The two arresting projections  60  are formed by (metal) spring clips  64 . 
     On the basis of  FIGS. 3 and 4  the “entrainer concept” during a pushing actuation of the rotary/push operating element realized according to the invention is explained, which is indicated by the arrows  2   a  to  2   f  and  3   a  to  3   f , respectively. According to  FIG. 3 , the depressing force is exerted on the key body  26  (see arrow  2   a ). By depressing the key body  26  the insert sleeve  44  is also depressed (see arrow  2   b ), namely against the force of the return springs  46 . The insert sleeve  44  has connected therewith the inner bearing ring  34  through which its outer bearing ring  32  is also moved downwards via the rolling bodies  36 ,  38  of the rolling bearing unit  30  (see arrows  2   c ,  2   d  and  2   e ). The outer bearing ring  32 , in turn, has rigidly connected therewith the ring element  28  of the rotary/push operating element  12  which is therefore moved downwards together with the key body  26  (see arrow  2   f ). 
       FIG. 4  shows the entrainer concept where the depressing force is exerted on the ring element  28  of the rotary/push operating element  12  (see arrow  3   a ). When the ring element  28  is depressed, the outer bearing ring  32  is depressed (see arrow  3   b ). Via the rolling bodies  36 ,  38  the outer bearing ring  32  entrains the inner bearing ring  34  (see arrow  3   c ). Thus this inner bearing ring  34  is also moved downwards (see arrow  3   d ). The inner bearing ring  34  has rigidly connected therewith the insert sleeve  44  which is also moved downwards (see arrow  3   e ) thus compressing the return springs  46 . The insert sleeve  44  has rigidly connected therewith the key body  26  such that the latter is finally moved downward together with the ring element  28  (see arrow  3   f ). 
     LIST OF REFERENCE NUMERALS 
     
         
           10  Operating device 
           12  Rotary/push operating element 
           14  Guide shaft of the rotary/push operating element 
           16  Carrier plate in the housing 
           18  Front panel of the housing 
           20  Housing 
           22  Cavity in the front panel 
           24  Operating part of the rotary/push operating element 
           26  Key body of the operating part 
           28  Ring element of the operating part extending about the latter&#39;s key body 
           30  Rolling bearing unit 
           32  Outer bearing ring of the rolling bearing unit 
           34  Inner bearing ring of the rolling bearing unit 
           36  Rolling body 
           38  Rolling body 
           40  Circular rotating assembly 
           42  Rotation sensor 
           44  Insert sleeve 
           46  Return spring 
           48  Projection in the insert sleeve 
           50  Pressure sensor 
           52  Rotary arresting unit 
           54  Arresting template of the rotary arresting unit 
           56  Arresting recesses of the arresting template 
           58  Raised portions of the arresting template 
           60  Arresting projections 
           62  Outside of the inner bearing ring 
           64  (Metal) spring clip of the arresting projections