Abstract:
Disclosed is a vehicle HVAC system that provides for installation, serviceability, or replacement of at least one actuator servo without removal of the HVAC assembly from the vehicle. As due to the tight space limitations, the present invention provides for at least one fastener-less mounting element of the servo assembly to be attached to the HVAC assembly, without the need for additional fasteners which would require additional space to access with a tool.

Description:
[0001]    This present invention relates to the field of automotive heating ventilating and air conditioning (HVAC) systems, more specifically this invention relates to attaching a servo assembly to the HVAC housing. 
       BACKGROUND 
       [0002]    This section provides background information related to the present disclosure which is not necessarily prior art. 
         [0003]    In automotive vehicles, it is common to have a climate control system (commonly known as an HVAC system) located within an instrument panel which provides heated or cooled air to occupants through dash panel defrost air outlets, instrument panel venting air outlets and floor directed air outlets. These HVAC systems typically comprise at least one door for directing the flow of air throughout the system. These doors are often controlled by one or more actuator servo motors, which provide a means of rotating the doors either directly or indirectly by means of one or more linkages. Due to the space constraints of modern vehicles, it is becoming more and more critical to utilize all space within the instrument panel, and therefore design the HVAC system to conform to the space constraints provided therefore. 
         [0004]    Typically, the HVAC main assembly is assembled prior to initial installation within the vehicle. This provides the easies means of installation within the space provided, but the downside to this, is in the event that service to one or more components is needed (such as the servo motor), it is often required to remove the entire HVAC assembly from the vehicle before servicing the servo, due to the inability or extreme difficulty in accessing all of the mounting fastener which attaches the servo assembly to the HVAC case. 
         [0005]    It would therefore be desirable to have an automotive HVAC system which provides an easily attachable/removable servo assembly, without the need to remove the entire HVAC assembly from the vehicle. 
       SUMMARY 
       [0006]    This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features. 
         [0007]    The present disclosure is directed to a vehicle HVAC system that provides for installation, serviceability, or replacement of at least one actuator servo without removal of the HVAC assembly from the vehicle. As due to the tight space limitations, the present invention provides for at least one fastener-less mounting element of the servo assembly to be attached to the HVAC assembly, without the need for additional fasteners which would require additional space to access with a tool such as a screwdriver or socket wrench. 
         [0008]    The HVAC case comprises at least one servo pivot pin receiving recess, and at least two fastener-less attachment means located around the pivot pin receiving recess. Each fastener-less attachment means comprises a ramp and deflectable locking tab located on the HVAC case, and oriented in the similar direction of rotation around the pivot pin receiving recess. The servo assembly further comprises a pivot pin and at least two corresponding servo assembly ears which are rotatably received under a corresponding locking tab of the HVAC case once the pivot pin is received in the servo pin receiving recess. And the servo assembly is rotated into locking position. Once secured, the servo assembly is thereby inhibited from further rotational, lateral, or vertical movement in relation to the HVAC case. In the event that removal and service of the servo assembly is desired, the servo can be rotated in the opposite direction to its installation direction, while simultaneously applying upward force on the locking tab(s) thereby allowing for removal of the ears from under the locking tabs as the servo assembly is counter rotated. 
         [0009]    In at least one embodiment, the servo assembly further comprises a third ear, through which a standard fastener may be located, securing the servo assembly to a corresponding receiving aperture in the HVAC case. This third ear is specifically positioned so that removal of the fastener may be accomplished with standard tools and without the need for removing the HVAC assembly from the vehicle. 
         [0010]    Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. 
     
    
     
       DRAWINGS 
         [0011]    The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure. 
           [0012]      FIG. 1  is a side view depicting a primary embodiment of a fastener-less actuator servo assembly securing means secured to an HVAC housing; 
           [0013]      FIG. 2  is a partial side view of the fastener-less servo assembly securing means of the HVAC housing; 
           [0014]      FIG. 3  is a partial side view of the servo assembly securing means during the first step of attachment to the HVAC housing; 
           [0015]      FIG. 4A  is a partial overhead view of the servo assembly securing means during the second step of attachment to the HVAC housing; 
           [0016]      FIG. 4B  is a partial side view of the servo assembly securing means during the second step of attachment to the HVAC housing; 
           [0017]      FIG. 5A  is a partial overhead view of the servo assembly securing means during the third step of attachment to the HVAC housing; 
           [0018]      FIG. 5B  is a partial side view of the servo assembly securing means during the third step of attachment to the HVAC housing; 
           [0019]      FIG. 6A  is a partial overhead view of the servo assembly securing means during the fourth step of attachment to the HVAC housing; and 
           [0020]      FIG. 6B  is a partial side view of the servo assembly securing means during the fourth step of attachment to the HVAC housing; 
       
    
    
       [0021]    Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings. 
       DETAILED DESCRIPTION 
       [0022]    Example embodiments will now be described more fully with reference to the accompanying drawings. The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features. 
         [0023]    Referring to the figures, in particularly  FIGS. 1-3 , a HVAC servo mounting system comprising the primary embodiment of the present disclosure is shown. The servo assembly comprises a servo motor  10 , attached to a servo assembly  14  for attaching to an HVAC housing  20 . The servo assembly  14  comprises at least two fastener-less attachment ears  15  extending generally planarly from the servo assembly  14  and positioned around the servo motor  10  of the servo assembly  14 . each attachment ear  15  has a through aperture  16 , centered at a distal portion of the ear, of which will be described later. A third attachment ear  12  having an aperture  13  there through is also extending generally coplanar from the servo assembly  14  as the fastener-less attachment ears  15 . The servo assembly  14  further comprises a pivot pin  11 , positioned on a bottom side thereof and located centrally between the fastener-less attachment ears  15  and the third attachment ear  12 . 
         [0024]    The HVAC housing  20  which receives the servo assembly  14  comprises two J-shaped locking tabs  22  integrated therein, corresponding to each fastener-less mounting ear  15  of the servo assembly  14 . Positioned below each locking tab  22  is a recess  25 , which receives a lower extending portion of the fastener-less mounting ear  15  of the servo assembly  14  in a locking manner when fully attached sop as to prevent any further rotational, vertical or lateral movement of the servo assembly  14 . 
         [0025]    Positioned directly below each recess  25 , is a pair of walls  27  which define a cavity  28  to be described in detail later. Adjacent to the recess  25 , is an inclined ramp feature  29 , leading up from the surface of the HVAC housing  20  to a generally planar portion surrounding each recess  25 . HVAC housing  20  further comprises a similar ramp  26  correlating to the third attachment ear  12  of the servo assembly  14 , having an additional aperture in the HVAC housing  20  (as can be seen in  FIG. 4A ). 
         [0026]    Each of the ramp features  29  and the ramp  26  are oriented in the same general direction around a pivot pin receiving recess  32  as shown in  FIG. 3 . The orientation of the ramp features  29  and ramp  26  may be either clockwise or counter-clockwise depending on the application, but for this example they are shown in a counter-clockwise orientation. 
         [0027]    The servo assembly  14  further comprises a servo arm  33  positioned around pivot pin  11 , the servo arm  33  having a pin  34  at a distal end, of which when assembled to the HVAC housing  20 , is received in servo linkage  24  attached to the HVAC housing  20  for controlling the one or more doors within the HVAC assembly. 
         [0028]    Now referring to  FIGS. 3-6B , the attachment of the servo assembly  14  to the HVAC housing  20  will be described in order. As illustrated in  FIGS. 3 and 4A , the servo assembly  14  is positioned directly above its mounting location on the HVAC housing  20 . In this position, the pivot pin  11  of the assembly is positioned directly above the pivot pin receiving recess  32  of the HVAC housing. The servo arm pin  34  is positioned above its receiving location in the linkage  24  of the HVAC housing, each fastener-less mounting ear  15  is positioned proximal the lower side of its corresponding ramp  29 , and third attachment ear  12  is positioned proximal the lower side of ramp  26 . 
         [0029]    Once properly aligned, the assembly is lowered vertically into position as shown by arrow A in  FIG. 3 , so as pivot pin receiving recess  32  fully receives pivot pin  11  of the servo assembly, and servo arm pin  34  is located in its receiving location within linkage  24 , assuring proper alignment is achieved. Once the proper alignment is confirmed, the servo assembly  14  is rotated counter clockwise as indicated by arrow B in  FIGS. 4A and 4B  until the lower portion of fastener-less mounting ear  15  contacts ramp  29  and the lower portion of the third attachment ear  12  contacts ramp  26 . 
         [0030]    As the servo assembly  14  is further rotated counter clockwise, while maintaining slight downward pressure, the ramps  29  and ramp  26  cause upward deflection of mounting ears  15  and third attachment ear  12  respectively as the lower portions of the ears  15 ,  12  ‘ride’ up ramps  29  and  26  as shown in  FIGS. 5A and 5B . As the ears  15 ,  12  reach the planar top side of their respective ramps  29 ,  26  during rotation of the assembly as indicated in  FIG. 5A  by arrow C, the chamfered edge of each locking tab  22  (as shown in  FIG. 5B ) deflects upward upon contact with a top portion of mounting ears  15  (arrow C′ of  FIG. 5B ). 
         [0031]    As assembly  14  is continued to be rotated counter-clockwise as shown by arrow D in  FIG. 6A , mounting ears  15  slide across the generally planar portion surrounding each recess  25  until the lower portions of the ears  15  are directly over recess&#39;  25 , at which time locking tabs  22  reflect back down towards their resting position, thereby biasing and locking the lower portions of ears  15  into recess&#39;  25 . At this time third attachment ear  12  is now positioned upon the generally planar surface atop ramp  26  accordingly and apertures  13  of third attachment ear  12  is aligned vertically with aperture in HVAC housing  20  atop ramp  26 . 
         [0032]    At this time, the servo assembly  14  is fully locked into position, and considered attached to the HVAC housing  20 . In a further embodiment wherein the specific vehicle application allows, a fastener may be subsequently inserted through aperture  13  of ear  12  into the corresponding aperture in HVAC housing atop ramp  26  for additional security. 
         [0033]    Although no additional fasteners or fastener are required for the fastener-less mounting ears  15  to be retained by locking tabs  22 , in the event that one or more locking tabs  22  breaks off, due to mishandling during installation, or servicing, the servo assembly  14  may still be attached to the HVAC housing  20  without replacing the entire HVAC assembly housing. In this instance, servo assembly  14  may be further mechanically fastened to the HVAC housing  20  by means of a fastener such as screw, bolt or pin (not illustrated) inserted through aperture  16  of ear  15 , and secured into the cavity  28  defined by walls  27  as illustrated in  FIG. 2 . This is not the intended means of securing the servo assembly  14  to the HVAC housing  20  as described in this disclosure, and would require removal of the HVAC housing  20  from the vehicle, but provides an alternative attachment means without the need to replace the entire HVAC housing. 
         [0034]    The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. For example, the primary embodiment disclosed two fastener-less locking ears, but the servo assembly  14  may have any number of fastener-less attachment ears greater than one, and may comprise the sole means of attaching the servo assembly to the HVAC housing. Such variations are not to be regarded as a departure from the invention, and all such modifications are intended to be included within the scope of the invention. For the purpose of this disclosure, the term fastener can mean any type of fastener known in the art such as pins, screws, bolts or the like comprised of materials such as metals, alloys, polymers, or plastics known in the art. 
         [0035]    Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail. 
         [0036]    The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed. 
         [0037]    When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
         [0038]    Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments. 
         [0039]    Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature&#39;s relationship to another element(s) or feature(s) as illustrated in the Figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the Figures. For example, if the device in the Figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.